Crypto | Node.js v23.11.0 Documentation (original) (raw)

Source Code: lib/crypto.js

The node:crypto module provides cryptographic functionality that includes a set of wrappers for OpenSSL's hash, HMAC, cipher, decipher, sign, and verify functions.

`const { createHmac } = await import('node:crypto');

const secret = 'abcdefg'; const hash = createHmac('sha256', secret) .update('I love cupcakes') .digest('hex'); console.log(hash); // Prints: // c0fa1bc00531bd78ef38c628449c5102aeabd49b5dc3a2a516ea6ea959d6658e const { createHmac } = require('node:crypto');

const secret = 'abcdefg'; const hash = createHmac('sha256', secret) .update('I love cupcakes') .digest('hex'); console.log(hash); // Prints: // c0fa1bc00531bd78ef38c628449c5102aeabd49b5dc3a2a516ea6ea959d6658e`

Determining if crypto support is unavailable#

It is possible for Node.js to be built without including support for thenode:crypto module. In such cases, attempting to import from crypto or calling require('node:crypto') will result in an error being thrown.

When using CommonJS, the error thrown can be caught using try/catch:

let crypto; try { crypto = require('node:crypto'); } catch (err) { console.error('crypto support is disabled!'); }

When using the lexical ESM import keyword, the error can only be caught if a handler for process.on('uncaughtException') is registered_before_ any attempt to load the module is made (using, for instance, a preload module).

When using ESM, if there is a chance that the code may be run on a build of Node.js where crypto support is not enabled, consider using theimport() function instead of the lexical import keyword:

let crypto; try { crypto = await import('node:crypto'); } catch (err) { console.error('crypto support is disabled!'); }

Class: Certificate#

Added in: v0.11.8

SPKAC is a Certificate Signing Request mechanism originally implemented by Netscape and was specified formally as part of HTML5's keygen element.

<keygen> is deprecated since HTML 5.2 and new projects should not use this element anymore.

The node:crypto module provides the Certificate class for working with SPKAC data. The most common usage is handling output generated by the HTML5<keygen> element. Node.js uses OpenSSL's SPKAC implementation internally.

Static method: Certificate.exportChallenge(spkac[, encoding])#

const { Certificate } = await import('node:crypto'); const spkac = getSpkacSomehow(); const challenge = Certificate.exportChallenge(spkac); console.log(challenge.toString('utf8')); // Prints: the challenge as a UTF8 string const { Certificate } = require('node:crypto'); const spkac = getSpkacSomehow(); const challenge = Certificate.exportChallenge(spkac); console.log(challenge.toString('utf8')); // Prints: the challenge as a UTF8 string

Static method: Certificate.exportPublicKey(spkac[, encoding])#

const { Certificate } = await import('node:crypto'); const spkac = getSpkacSomehow(); const publicKey = Certificate.exportPublicKey(spkac); console.log(publicKey); // Prints: the public key as <Buffer ...> const { Certificate } = require('node:crypto'); const spkac = getSpkacSomehow(); const publicKey = Certificate.exportPublicKey(spkac); console.log(publicKey); // Prints: the public key as <Buffer ...>

Static method: Certificate.verifySpkac(spkac[, encoding])#

`import { Buffer } from 'node:buffer'; const { Certificate } = await import('node:crypto');

const spkac = getSpkacSomehow(); console.log(Certificate.verifySpkac(Buffer.from(spkac))); // Prints: true or false const { Buffer } = require('node:buffer'); const { Certificate } = require('node:crypto');

const spkac = getSpkacSomehow(); console.log(Certificate.verifySpkac(Buffer.from(spkac))); // Prints: true or false`

Legacy API#

As a legacy interface, it is possible to create new instances of the crypto.Certificate class as illustrated in the examples below.

new crypto.Certificate()#

Instances of the Certificate class can be created using the new keyword or by calling crypto.Certificate() as a function:

`const { Certificate } = await import('node:crypto');

const cert1 = new Certificate(); const cert2 = Certificate(); const { Certificate } = require('node:crypto');

const cert1 = new Certificate(); const cert2 = Certificate();`

certificate.exportChallenge(spkac[, encoding])#

Added in: v0.11.8

const { Certificate } = await import('node:crypto'); const cert = Certificate(); const spkac = getSpkacSomehow(); const challenge = cert.exportChallenge(spkac); console.log(challenge.toString('utf8')); // Prints: the challenge as a UTF8 string const { Certificate } = require('node:crypto'); const cert = Certificate(); const spkac = getSpkacSomehow(); const challenge = cert.exportChallenge(spkac); console.log(challenge.toString('utf8')); // Prints: the challenge as a UTF8 string

certificate.exportPublicKey(spkac[, encoding])#

Added in: v0.11.8

const { Certificate } = await import('node:crypto'); const cert = Certificate(); const spkac = getSpkacSomehow(); const publicKey = cert.exportPublicKey(spkac); console.log(publicKey); // Prints: the public key as <Buffer ...> const { Certificate } = require('node:crypto'); const cert = Certificate(); const spkac = getSpkacSomehow(); const publicKey = cert.exportPublicKey(spkac); console.log(publicKey); // Prints: the public key as <Buffer ...>

certificate.verifySpkac(spkac[, encoding])#

Added in: v0.11.8

`import { Buffer } from 'node:buffer'; const { Certificate } = await import('node:crypto');

const cert = Certificate(); const spkac = getSpkacSomehow(); console.log(cert.verifySpkac(Buffer.from(spkac))); // Prints: true or false const { Buffer } = require('node:buffer'); const { Certificate } = require('node:crypto');

const cert = Certificate(); const spkac = getSpkacSomehow(); console.log(cert.verifySpkac(Buffer.from(spkac))); // Prints: true or false`

Class: Cipher#

Added in: v0.1.94

Instances of the Cipher class are used to encrypt data. The class can be used in one of two ways:

The crypto.createCipheriv() method is used to create Cipher instances. Cipher objects are not to be created directly using the new keyword.

Example: Using Cipher objects as streams:

`const { scrypt, randomFill, createCipheriv, } = await import('node:crypto');

const algorithm = 'aes-192-cbc'; const password = 'Password used to generate key';

// First, we'll generate the key. The key length is dependent on the algorithm. // In this case for aes192, it is 24 bytes (192 bits). scrypt(password, 'salt', 24, (err, key) => { if (err) throw err; // Then, we'll generate a random initialization vector randomFill(new Uint8Array(16), (err, iv) => { if (err) throw err;

// Once we have the key and iv, we can create and use the cipher...
const cipher = createCipheriv(algorithm, key, iv);

let encrypted = '';
cipher.setEncoding('hex');

cipher.on('data', (chunk) => encrypted += chunk);
cipher.on('end', () => console.log(encrypted));

cipher.write('some clear text data');
cipher.end();

}); }); const { scrypt, randomFill, createCipheriv, } = require('node:crypto');

const algorithm = 'aes-192-cbc'; const password = 'Password used to generate key';

// First, we'll generate the key. The key length is dependent on the algorithm. // In this case for aes192, it is 24 bytes (192 bits). scrypt(password, 'salt', 24, (err, key) => { if (err) throw err; // Then, we'll generate a random initialization vector randomFill(new Uint8Array(16), (err, iv) => { if (err) throw err;

// Once we have the key and iv, we can create and use the cipher...
const cipher = createCipheriv(algorithm, key, iv);

let encrypted = '';
cipher.setEncoding('hex');

cipher.on('data', (chunk) => encrypted += chunk);
cipher.on('end', () => console.log(encrypted));

cipher.write('some clear text data');
cipher.end();

}); });`

Example: Using Cipher and piped streams:

`import { createReadStream, createWriteStream, } from 'node:fs';

import { pipeline, } from 'node:stream';

const { scrypt, randomFill, createCipheriv, } = await import('node:crypto');

const algorithm = 'aes-192-cbc'; const password = 'Password used to generate key';

// First, we'll generate the key. The key length is dependent on the algorithm. // In this case for aes192, it is 24 bytes (192 bits). scrypt(password, 'salt', 24, (err, key) => { if (err) throw err; // Then, we'll generate a random initialization vector randomFill(new Uint8Array(16), (err, iv) => { if (err) throw err;

const cipher = createCipheriv(algorithm, key, iv);

const input = createReadStream('test.js');
const output = createWriteStream('test.enc');

pipeline(input, cipher, output, (err) => {
  if (err) throw err;
});

}); }); const { createReadStream, createWriteStream, } = require('node:fs');

const { pipeline, } = require('node:stream');

const { scrypt, randomFill, createCipheriv, } = require('node:crypto');

const algorithm = 'aes-192-cbc'; const password = 'Password used to generate key';

// First, we'll generate the key. The key length is dependent on the algorithm. // In this case for aes192, it is 24 bytes (192 bits). scrypt(password, 'salt', 24, (err, key) => { if (err) throw err; // Then, we'll generate a random initialization vector randomFill(new Uint8Array(16), (err, iv) => { if (err) throw err;

const cipher = createCipheriv(algorithm, key, iv);

const input = createReadStream('test.js');
const output = createWriteStream('test.enc');

pipeline(input, cipher, output, (err) => {
  if (err) throw err;
});

}); });`

Example: Using the cipher.update() and cipher.final() methods:

`const { scrypt, randomFill, createCipheriv, } = await import('node:crypto');

const algorithm = 'aes-192-cbc'; const password = 'Password used to generate key';

// First, we'll generate the key. The key length is dependent on the algorithm. // In this case for aes192, it is 24 bytes (192 bits). scrypt(password, 'salt', 24, (err, key) => { if (err) throw err; // Then, we'll generate a random initialization vector randomFill(new Uint8Array(16), (err, iv) => { if (err) throw err;

const cipher = createCipheriv(algorithm, key, iv);

let encrypted = cipher.update('some clear text data', 'utf8', 'hex');
encrypted += cipher.final('hex');
console.log(encrypted);

}); }); const { scrypt, randomFill, createCipheriv, } = require('node:crypto');

const algorithm = 'aes-192-cbc'; const password = 'Password used to generate key';

// First, we'll generate the key. The key length is dependent on the algorithm. // In this case for aes192, it is 24 bytes (192 bits). scrypt(password, 'salt', 24, (err, key) => { if (err) throw err; // Then, we'll generate a random initialization vector randomFill(new Uint8Array(16), (err, iv) => { if (err) throw err;

const cipher = createCipheriv(algorithm, key, iv);

let encrypted = cipher.update('some clear text data', 'utf8', 'hex');
encrypted += cipher.final('hex');
console.log(encrypted);

}); });`

cipher.final([outputEncoding])#

Added in: v0.1.94

Once the cipher.final() method has been called, the Cipher object can no longer be used to encrypt data. Attempts to call cipher.final() more than once will result in an error being thrown.

cipher.getAuthTag()#

Added in: v1.0.0

The cipher.getAuthTag() method should only be called after encryption has been completed using the cipher.final() method.

If the authTagLength option was set during the cipher instance's creation, this function will return exactly authTagLength bytes.

cipher.setAAD(buffer[, options])#

Added in: v1.0.0

When using an authenticated encryption mode (GCM, CCM, OCB, andchacha20-poly1305 are currently supported), the cipher.setAAD() method sets the value used for the_additional authenticated data_ (AAD) input parameter.

The plaintextLength option is optional for GCM and OCB. When using CCM, the plaintextLength option must be specified and its value must match the length of the plaintext in bytes. See CCM mode.

The cipher.setAAD() method must be called before cipher.update().

cipher.setAutoPadding([autoPadding])#

Added in: v0.7.1

When using block encryption algorithms, the Cipher class will automatically add padding to the input data to the appropriate block size. To disable the default padding call cipher.setAutoPadding(false).

When autoPadding is false, the length of the entire input data must be a multiple of the cipher's block size or cipher.final() will throw an error. Disabling automatic padding is useful for non-standard padding, for instance using 0x0 instead of PKCS padding.

The cipher.setAutoPadding() method must be called beforecipher.final().

cipher.update(data[, inputEncoding][, outputEncoding])#

Updates the cipher with data. If the inputEncoding argument is given, the dataargument is a string using the specified encoding. If the inputEncodingargument is not given, data must be a Buffer, TypedArray, orDataView. If data is a Buffer, TypedArray, or DataView, theninputEncoding is ignored.

The outputEncoding specifies the output format of the enciphered data. If the outputEncodingis specified, a string using the specified encoding is returned. If nooutputEncoding is provided, a Buffer is returned.

The cipher.update() method can be called multiple times with new data untilcipher.final() is called. Calling cipher.update() aftercipher.final() will result in an error being thrown.

Class: Decipher#

Added in: v0.1.94

Instances of the Decipher class are used to decrypt data. The class can be used in one of two ways:

The crypto.createDecipheriv() method is used to create Decipher instances. Decipher objects are not to be created directly using the new keyword.

Example: Using Decipher objects as streams:

`` import { Buffer } from 'node:buffer'; const { scryptSync, createDecipheriv, } = await import('node:crypto');

const algorithm = 'aes-192-cbc'; const password = 'Password used to generate key'; // Key length is dependent on the algorithm. In this case for aes192, it is // 24 bytes (192 bits). // Use the async crypto.scrypt() instead. const key = scryptSync(password, 'salt', 24); // The IV is usually passed along with the ciphertext. const iv = Buffer.alloc(16, 0); // Initialization vector.

const decipher = createDecipheriv(algorithm, key, iv);

let decrypted = ''; decipher.on('readable', () => { let chunk; while (null !== (chunk = decipher.read())) { decrypted += chunk.toString('utf8'); } }); decipher.on('end', () => { console.log(decrypted); // Prints: some clear text data });

// Encrypted with same algorithm, key and iv. const encrypted = 'e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa'; decipher.write(encrypted, 'hex'); decipher.end(); const { scryptSync, createDecipheriv, } = require('node:crypto'); const { Buffer } = require('node:buffer');

const algorithm = 'aes-192-cbc'; const password = 'Password used to generate key'; // Key length is dependent on the algorithm. In this case for aes192, it is // 24 bytes (192 bits). // Use the async crypto.scrypt() instead. const key = scryptSync(password, 'salt', 24); // The IV is usually passed along with the ciphertext. const iv = Buffer.alloc(16, 0); // Initialization vector.

const decipher = createDecipheriv(algorithm, key, iv);

let decrypted = ''; decipher.on('readable', () => { let chunk; while (null !== (chunk = decipher.read())) { decrypted += chunk.toString('utf8'); } }); decipher.on('end', () => { console.log(decrypted); // Prints: some clear text data });

// Encrypted with same algorithm, key and iv. const encrypted = 'e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa'; decipher.write(encrypted, 'hex'); decipher.end(); ``

Example: Using Decipher and piped streams:

`` import { createReadStream, createWriteStream, } from 'node:fs'; import { Buffer } from 'node:buffer'; const { scryptSync, createDecipheriv, } = await import('node:crypto');

const algorithm = 'aes-192-cbc'; const password = 'Password used to generate key'; // Use the async crypto.scrypt() instead. const key = scryptSync(password, 'salt', 24); // The IV is usually passed along with the ciphertext. const iv = Buffer.alloc(16, 0); // Initialization vector.

const decipher = createDecipheriv(algorithm, key, iv);

const input = createReadStream('test.enc'); const output = createWriteStream('test.js');

input.pipe(decipher).pipe(output); const { createReadStream, createWriteStream, } = require('node:fs'); const { scryptSync, createDecipheriv, } = require('node:crypto'); const { Buffer } = require('node:buffer');

const algorithm = 'aes-192-cbc'; const password = 'Password used to generate key'; // Use the async crypto.scrypt() instead. const key = scryptSync(password, 'salt', 24); // The IV is usually passed along with the ciphertext. const iv = Buffer.alloc(16, 0); // Initialization vector.

const decipher = createDecipheriv(algorithm, key, iv);

const input = createReadStream('test.enc'); const output = createWriteStream('test.js');

input.pipe(decipher).pipe(output); ``

Example: Using the decipher.update() and decipher.final() methods:

`` import { Buffer } from 'node:buffer'; const { scryptSync, createDecipheriv, } = await import('node:crypto');

const algorithm = 'aes-192-cbc'; const password = 'Password used to generate key'; // Use the async crypto.scrypt() instead. const key = scryptSync(password, 'salt', 24); // The IV is usually passed along with the ciphertext. const iv = Buffer.alloc(16, 0); // Initialization vector.

const decipher = createDecipheriv(algorithm, key, iv);

// Encrypted using same algorithm, key and iv. const encrypted = 'e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa'; let decrypted = decipher.update(encrypted, 'hex', 'utf8'); decrypted += decipher.final('utf8'); console.log(decrypted); // Prints: some clear text data const { scryptSync, createDecipheriv, } = require('node:crypto'); const { Buffer } = require('node:buffer');

const algorithm = 'aes-192-cbc'; const password = 'Password used to generate key'; // Use the async crypto.scrypt() instead. const key = scryptSync(password, 'salt', 24); // The IV is usually passed along with the ciphertext. const iv = Buffer.alloc(16, 0); // Initialization vector.

const decipher = createDecipheriv(algorithm, key, iv);

// Encrypted using same algorithm, key and iv. const encrypted = 'e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa'; let decrypted = decipher.update(encrypted, 'hex', 'utf8'); decrypted += decipher.final('utf8'); console.log(decrypted); // Prints: some clear text data ``

decipher.final([outputEncoding])#

Added in: v0.1.94

Once the decipher.final() method has been called, the Decipher object can no longer be used to decrypt data. Attempts to call decipher.final() more than once will result in an error being thrown.

decipher.setAAD(buffer[, options])#

When using an authenticated encryption mode (GCM, CCM, OCB, andchacha20-poly1305 are currently supported), the decipher.setAAD() method sets the value used for the_additional authenticated data_ (AAD) input parameter.

The options argument is optional for GCM. When using CCM, theplaintextLength option must be specified and its value must match the length of the ciphertext in bytes. See CCM mode.

The decipher.setAAD() method must be called before decipher.update().

When passing a string as the buffer, please considercaveats when using strings as inputs to cryptographic APIs.

decipher.setAuthTag(buffer[, encoding])#

When using an authenticated encryption mode (GCM, CCM, OCB, andchacha20-poly1305 are currently supported), the decipher.setAuthTag() method is used to pass in the received authentication tag. If no tag is provided, or if the cipher text has been tampered with, decipher.final() will throw, indicating that the cipher text should be discarded due to failed authentication. If the tag length is invalid according to NIST SP 800-38D or does not match the value of theauthTagLength option, decipher.setAuthTag() will throw an error.

The decipher.setAuthTag() method must be called before decipher.update()for CCM mode or before decipher.final() for GCM and OCB modes andchacha20-poly1305.decipher.setAuthTag() can only be called once.

When passing a string as the authentication tag, please considercaveats when using strings as inputs to cryptographic APIs.

decipher.setAutoPadding([autoPadding])#

Added in: v0.7.1

When data has been encrypted without standard block padding, callingdecipher.setAutoPadding(false) will disable automatic padding to preventdecipher.final() from checking for and removing padding.

Turning auto padding off will only work if the input data's length is a multiple of the ciphers block size.

The decipher.setAutoPadding() method must be called beforedecipher.final().

decipher.update(data[, inputEncoding][, outputEncoding])#

Updates the decipher with data. If the inputEncoding argument is given, the dataargument is a string using the specified encoding. If the inputEncodingargument is not given, data must be a Buffer. If data is aBuffer then inputEncoding is ignored.

The outputEncoding specifies the output format of the enciphered data. If the outputEncodingis specified, a string using the specified encoding is returned. If nooutputEncoding is provided, a Buffer is returned.

The decipher.update() method can be called multiple times with new data untildecipher.final() is called. Calling decipher.update() afterdecipher.final() will result in an error being thrown.

Even if the underlying cipher implements authentication, the authenticity and integrity of the plaintext returned from this function may be uncertain at this time. For authenticated encryption algorithms, authenticity is generally only established when the application calls decipher.final().

Class: DiffieHellman#

Added in: v0.5.0

The DiffieHellman class is a utility for creating Diffie-Hellman key exchanges.

Instances of the DiffieHellman class can be created using thecrypto.createDiffieHellman() function.

`import assert from 'node:assert';

const { createDiffieHellman, } = await import('node:crypto');

// Generate Alice's keys... const alice = createDiffieHellman(2048); const aliceKey = alice.generateKeys();

// Generate Bob's keys... const bob = createDiffieHellman(alice.getPrime(), alice.getGenerator()); const bobKey = bob.generateKeys();

// Exchange and generate the secret... const aliceSecret = alice.computeSecret(bobKey); const bobSecret = bob.computeSecret(aliceKey);

// OK assert.strictEqual(aliceSecret.toString('hex'), bobSecret.toString('hex')); const assert = require('node:assert');

const { createDiffieHellman, } = require('node:crypto');

// Generate Alice's keys... const alice = createDiffieHellman(2048); const aliceKey = alice.generateKeys();

// Generate Bob's keys... const bob = createDiffieHellman(alice.getPrime(), alice.getGenerator()); const bobKey = bob.generateKeys();

// Exchange and generate the secret... const aliceSecret = alice.computeSecret(bobKey); const bobSecret = bob.computeSecret(aliceKey);

// OK assert.strictEqual(aliceSecret.toString('hex'), bobSecret.toString('hex'));`

diffieHellman.computeSecret(otherPublicKey[, inputEncoding][, outputEncoding])#

Added in: v0.5.0

Computes the shared secret using otherPublicKey as the other party's public key and returns the computed shared secret. The supplied key is interpreted using the specified inputEncoding, and secret is encoded using specified outputEncoding. If the inputEncoding is not provided, otherPublicKey is expected to be a Buffer,TypedArray, or DataView.

If outputEncoding is given a string is returned; otherwise, aBuffer is returned.

diffieHellman.generateKeys([encoding])#

Added in: v0.5.0

Generates private and public Diffie-Hellman key values unless they have been generated or computed already, and returns the public key in the specified encoding. This key should be transferred to the other party. If encoding is provided a string is returned; otherwise aBuffer is returned.

This function is a thin wrapper around DH_generate_key(). In particular, once a private key has been generated or set, calling this function only updates the public key but does not generate a new private key.

diffieHellman.getGenerator([encoding])#

Added in: v0.5.0

Returns the Diffie-Hellman generator in the specified encoding. If encoding is provided a string is returned; otherwise a Buffer is returned.

diffieHellman.getPrime([encoding])#

Added in: v0.5.0

Returns the Diffie-Hellman prime in the specified encoding. If encoding is provided a string is returned; otherwise a Buffer is returned.

diffieHellman.getPrivateKey([encoding])#

Added in: v0.5.0

Returns the Diffie-Hellman private key in the specified encoding. If encoding is provided a string is returned; otherwise a Buffer is returned.

diffieHellman.getPublicKey([encoding])#

Added in: v0.5.0

Returns the Diffie-Hellman public key in the specified encoding. If encoding is provided a string is returned; otherwise a Buffer is returned.

diffieHellman.setPrivateKey(privateKey[, encoding])#

Added in: v0.5.0

Sets the Diffie-Hellman private key. If the encoding argument is provided,privateKey is expected to be a string. If no encoding is provided, privateKey is expected to be a Buffer, TypedArray, or DataView.

This function does not automatically compute the associated public key. EitherdiffieHellman.setPublicKey() or diffieHellman.generateKeys() can be used to manually provide the public key or to automatically derive it.

diffieHellman.setPublicKey(publicKey[, encoding])#

Added in: v0.5.0

Sets the Diffie-Hellman public key. If the encoding argument is provided,publicKey is expected to be a string. If no encoding is provided, publicKey is expected to be a Buffer, TypedArray, or DataView.

diffieHellman.verifyError#

Added in: v0.11.12

A bit field containing any warnings and/or errors resulting from a check performed during initialization of the DiffieHellman object.

The following values are valid for this property (as defined in node:constants module):

Class: DiffieHellmanGroup#

Added in: v0.7.5

The DiffieHellmanGroup class takes a well-known modp group as its argument. It works the same as DiffieHellman, except that it does not allow changing its keys after creation. In other words, it does not implement setPublicKey()or setPrivateKey() methods.

const { createDiffieHellmanGroup } = await import('node:crypto'); const dh = createDiffieHellmanGroup('modp16'); const { createDiffieHellmanGroup } = require('node:crypto'); const dh = createDiffieHellmanGroup('modp16');

The following groups are supported:

The following groups are still supported but deprecated (see Caveats):

These deprecated groups might be removed in future versions of Node.js.

Class: ECDH#

Added in: v0.11.14

The ECDH class is a utility for creating Elliptic Curve Diffie-Hellman (ECDH) key exchanges.

Instances of the ECDH class can be created using thecrypto.createECDH() function.

`import assert from 'node:assert';

const { createECDH, } = await import('node:crypto');

// Generate Alice's keys... const alice = createECDH('secp521r1'); const aliceKey = alice.generateKeys();

// Generate Bob's keys... const bob = createECDH('secp521r1'); const bobKey = bob.generateKeys();

// Exchange and generate the secret... const aliceSecret = alice.computeSecret(bobKey); const bobSecret = bob.computeSecret(aliceKey);

assert.strictEqual(aliceSecret.toString('hex'), bobSecret.toString('hex')); // OK const assert = require('node:assert');

const { createECDH, } = require('node:crypto');

// Generate Alice's keys... const alice = createECDH('secp521r1'); const aliceKey = alice.generateKeys();

// Generate Bob's keys... const bob = createECDH('secp521r1'); const bobKey = bob.generateKeys();

// Exchange and generate the secret... const aliceSecret = alice.computeSecret(bobKey); const bobSecret = bob.computeSecret(aliceKey);

assert.strictEqual(aliceSecret.toString('hex'), bobSecret.toString('hex')); // OK`

Static method: ECDH.convertKey(key, curve[, inputEncoding[, outputEncoding[, format]]])#

Added in: v10.0.0

Converts the EC Diffie-Hellman public key specified by key and curve to the format specified by format. The format argument specifies point encoding and can be 'compressed', 'uncompressed' or 'hybrid'. The supplied key is interpreted using the specified inputEncoding, and the returned key is encoded using the specified outputEncoding.

Use crypto.getCurves() to obtain a list of available curve names. On recent OpenSSL releases, openssl ecparam -list_curves will also display the name and description of each available elliptic curve.

If format is not specified the point will be returned in 'uncompressed'format.

If the inputEncoding is not provided, key is expected to be a Buffer,TypedArray, or DataView.

Example (uncompressing a key):

`const { createECDH, ECDH, } = await import('node:crypto');

const ecdh = createECDH('secp256k1'); ecdh.generateKeys();

const compressedKey = ecdh.getPublicKey('hex', 'compressed');

const uncompressedKey = ECDH.convertKey(compressedKey, 'secp256k1', 'hex', 'hex', 'uncompressed');

// The converted key and the uncompressed public key should be the same console.log(uncompressedKey === ecdh.getPublicKey('hex')); const { createECDH, ECDH, } = require('node:crypto');

const ecdh = createECDH('secp256k1'); ecdh.generateKeys();

const compressedKey = ecdh.getPublicKey('hex', 'compressed');

const uncompressedKey = ECDH.convertKey(compressedKey, 'secp256k1', 'hex', 'hex', 'uncompressed');

// The converted key and the uncompressed public key should be the same console.log(uncompressedKey === ecdh.getPublicKey('hex'));`

ecdh.computeSecret(otherPublicKey[, inputEncoding][, outputEncoding])#

Computes the shared secret using otherPublicKey as the other party's public key and returns the computed shared secret. The supplied key is interpreted using specified inputEncoding, and the returned secret is encoded using the specified outputEncoding. If the inputEncoding is not provided, otherPublicKey is expected to be a Buffer, TypedArray, orDataView.

If outputEncoding is given a string will be returned; otherwise aBuffer is returned.

ecdh.computeSecret will throw anERR_CRYPTO_ECDH_INVALID_PUBLIC_KEY error when otherPublicKeylies outside of the elliptic curve. Since otherPublicKey is usually supplied from a remote user over an insecure network, be sure to handle this exception accordingly.

ecdh.generateKeys([encoding[, format]])#

Added in: v0.11.14

Generates private and public EC Diffie-Hellman key values, and returns the public key in the specified format and encoding. This key should be transferred to the other party.

The format argument specifies point encoding and can be 'compressed' or'uncompressed'. If format is not specified, the point will be returned in'uncompressed' format.

If encoding is provided a string is returned; otherwise a Bufferis returned.

ecdh.getPrivateKey([encoding])#

Added in: v0.11.14

If encoding is specified, a string is returned; otherwise a Buffer is returned.

ecdh.getPublicKey([encoding][, format])#

Added in: v0.11.14

The format argument specifies point encoding and can be 'compressed' or'uncompressed'. If format is not specified the point will be returned in'uncompressed' format.

If encoding is specified, a string is returned; otherwise a Buffer is returned.

ecdh.setPrivateKey(privateKey[, encoding])#

Added in: v0.11.14

Sets the EC Diffie-Hellman private key. If encoding is provided, privateKey is expected to be a string; otherwise privateKey is expected to be a Buffer,TypedArray, or DataView.

If privateKey is not valid for the curve specified when the ECDH object was created, an error is thrown. Upon setting the private key, the associated public point (key) is also generated and set in the ECDH object.

ecdh.setPublicKey(publicKey[, encoding])#

Added in: v0.11.14Deprecated since: v5.2.0

Sets the EC Diffie-Hellman public key. If encoding is provided publicKey is expected to be a string; otherwise a Buffer, TypedArray, or DataView is expected.

There is not normally a reason to call this method because ECDHonly requires a private key and the other party's public key to compute the shared secret. Typically either ecdh.generateKeys() orecdh.setPrivateKey() will be called. The ecdh.setPrivateKey() method attempts to generate the public point/key associated with the private key being set.

Example (obtaining a shared secret):

`const { createECDH, createHash, } = await import('node:crypto');

const alice = createECDH('secp256k1'); const bob = createECDH('secp256k1');

// This is a shortcut way of specifying one of Alice's previous private // keys. It would be unwise to use such a predictable private key in a real // application. alice.setPrivateKey( createHash('sha256').update('alice', 'utf8').digest(), );

// Bob uses a newly generated cryptographically strong // pseudorandom key pair bob.generateKeys();

const aliceSecret = alice.computeSecret(bob.getPublicKey(), null, 'hex'); const bobSecret = bob.computeSecret(alice.getPublicKey(), null, 'hex');

// aliceSecret and bobSecret should be the same shared secret value console.log(aliceSecret === bobSecret); const { createECDH, createHash, } = require('node:crypto');

const alice = createECDH('secp256k1'); const bob = createECDH('secp256k1');

// This is a shortcut way of specifying one of Alice's previous private // keys. It would be unwise to use such a predictable private key in a real // application. alice.setPrivateKey( createHash('sha256').update('alice', 'utf8').digest(), );

// Bob uses a newly generated cryptographically strong // pseudorandom key pair bob.generateKeys();

const aliceSecret = alice.computeSecret(bob.getPublicKey(), null, 'hex'); const bobSecret = bob.computeSecret(alice.getPublicKey(), null, 'hex');

// aliceSecret and bobSecret should be the same shared secret value console.log(aliceSecret === bobSecret);`

Class: Hash#

Added in: v0.1.92

The Hash class is a utility for creating hash digests of data. It can be used in one of two ways:

The crypto.createHash() method is used to create Hash instances. Hashobjects are not to be created directly using the new keyword.

Example: Using Hash objects as streams:

`const { createHash, } = await import('node:crypto');

const hash = createHash('sha256');

hash.on('readable', () => { // Only one element is going to be produced by the // hash stream. const data = hash.read(); if (data) { console.log(data.toString('hex')); // Prints: // 6a2da20943931e9834fc12cfe5bb47bbd9ae43489a30726962b576f4e3993e50 } });

hash.write('some data to hash'); hash.end(); const { createHash, } = require('node:crypto');

const hash = createHash('sha256');

hash.on('readable', () => { // Only one element is going to be produced by the // hash stream. const data = hash.read(); if (data) { console.log(data.toString('hex')); // Prints: // 6a2da20943931e9834fc12cfe5bb47bbd9ae43489a30726962b576f4e3993e50 } });

hash.write('some data to hash'); hash.end();`

Example: Using Hash and piped streams:

`import { createReadStream } from 'node:fs'; import { stdout } from 'node:process'; const { createHash } = await import('node:crypto');

const hash = createHash('sha256');

const input = createReadStream('test.js'); input.pipe(hash).setEncoding('hex').pipe(stdout); const { createReadStream } = require('node:fs'); const { createHash } = require('node:crypto'); const { stdout } = require('node:process');

const hash = createHash('sha256');

const input = createReadStream('test.js'); input.pipe(hash).setEncoding('hex').pipe(stdout);`

Example: Using the hash.update() and hash.digest() methods:

`const { createHash, } = await import('node:crypto');

const hash = createHash('sha256');

hash.update('some data to hash'); console.log(hash.digest('hex')); // Prints: // 6a2da20943931e9834fc12cfe5bb47bbd9ae43489a30726962b576f4e3993e50 const { createHash, } = require('node:crypto');

const hash = createHash('sha256');

hash.update('some data to hash'); console.log(hash.digest('hex')); // Prints: // 6a2da20943931e9834fc12cfe5bb47bbd9ae43489a30726962b576f4e3993e50`

hash.copy([options])#

Added in: v13.1.0

Creates a new Hash object that contains a deep copy of the internal state of the current Hash object.

The optional options argument controls stream behavior. For XOF hash functions such as 'shake256', the outputLength option can be used to specify the desired output length in bytes.

An error is thrown when an attempt is made to copy the Hash object after its hash.digest() method has been called.

`// Calculate a rolling hash. const { createHash, } = await import('node:crypto');

const hash = createHash('sha256');

hash.update('one'); console.log(hash.copy().digest('hex'));

hash.update('two'); console.log(hash.copy().digest('hex'));

hash.update('three'); console.log(hash.copy().digest('hex'));

// Etc. // Calculate a rolling hash. const { createHash, } = require('node:crypto');

const hash = createHash('sha256');

hash.update('one'); console.log(hash.copy().digest('hex'));

hash.update('two'); console.log(hash.copy().digest('hex'));

hash.update('three'); console.log(hash.copy().digest('hex'));

// Etc.`

hash.digest([encoding])#

Added in: v0.1.92

Calculates the digest of all of the data passed to be hashed (using thehash.update() method). If encoding is provided a string will be returned; otherwise a Buffer is returned.

The Hash object can not be used again after hash.digest() method has been called. Multiple calls will cause an error to be thrown.

hash.update(data[, inputEncoding])#

Updates the hash content with the given data, the encoding of which is given in inputEncoding. If encoding is not provided, and the data is a string, an encoding of 'utf8' is enforced. If data is a Buffer, TypedArray, orDataView, then inputEncoding is ignored.

This can be called many times with new data as it is streamed.

Class: Hmac#

Added in: v0.1.94

The Hmac class is a utility for creating cryptographic HMAC digests. It can be used in one of two ways:

The crypto.createHmac() method is used to create Hmac instances. Hmacobjects are not to be created directly using the new keyword.

Example: Using Hmac objects as streams:

`const { createHmac, } = await import('node:crypto');

const hmac = createHmac('sha256', 'a secret');

hmac.on('readable', () => { // Only one element is going to be produced by the // hash stream. const data = hmac.read(); if (data) { console.log(data.toString('hex')); // Prints: // 7fd04df92f636fd450bc841c9418e5825c17f33ad9c87c518115a45971f7f77e } });

hmac.write('some data to hash'); hmac.end(); const { createHmac, } = require('node:crypto');

const hmac = createHmac('sha256', 'a secret');

hmac.on('readable', () => { // Only one element is going to be produced by the // hash stream. const data = hmac.read(); if (data) { console.log(data.toString('hex')); // Prints: // 7fd04df92f636fd450bc841c9418e5825c17f33ad9c87c518115a45971f7f77e } });

hmac.write('some data to hash'); hmac.end();`

Example: Using Hmac and piped streams:

`import { createReadStream } from 'node:fs'; import { stdout } from 'node:process'; const { createHmac, } = await import('node:crypto');

const hmac = createHmac('sha256', 'a secret');

const input = createReadStream('test.js'); input.pipe(hmac).pipe(stdout); const { createReadStream, } = require('node:fs'); const { createHmac, } = require('node:crypto'); const { stdout } = require('node:process');

const hmac = createHmac('sha256', 'a secret');

const input = createReadStream('test.js'); input.pipe(hmac).pipe(stdout);`

Example: Using the hmac.update() and hmac.digest() methods:

`const { createHmac, } = await import('node:crypto');

const hmac = createHmac('sha256', 'a secret');

hmac.update('some data to hash'); console.log(hmac.digest('hex')); // Prints: // 7fd04df92f636fd450bc841c9418e5825c17f33ad9c87c518115a45971f7f77e const { createHmac, } = require('node:crypto');

const hmac = createHmac('sha256', 'a secret');

hmac.update('some data to hash'); console.log(hmac.digest('hex')); // Prints: // 7fd04df92f636fd450bc841c9418e5825c17f33ad9c87c518115a45971f7f77e`

hmac.digest([encoding])#

Added in: v0.1.94

Calculates the HMAC digest of all of the data passed using hmac.update(). If encoding is provided a string is returned; otherwise a Buffer is returned;

The Hmac object can not be used again after hmac.digest() has been called. Multiple calls to hmac.digest() will result in an error being thrown.

hmac.update(data[, inputEncoding])#

Updates the Hmac content with the given data, the encoding of which is given in inputEncoding. If encoding is not provided, and the data is a string, an encoding of 'utf8' is enforced. If data is a Buffer, TypedArray, orDataView, then inputEncoding is ignored.

This can be called many times with new data as it is streamed.

Class: KeyObject#

Node.js uses a KeyObject class to represent a symmetric or asymmetric key, and each kind of key exposes different functions. Thecrypto.createSecretKey(), crypto.createPublicKey() andcrypto.createPrivateKey() methods are used to create KeyObjectinstances. KeyObject objects are not to be created directly using the newkeyword.

Most applications should consider using the new KeyObject API instead of passing keys as strings or Buffers due to improved security features.

KeyObject instances can be passed to other threads via postMessage(). The receiver obtains a cloned KeyObject, and the KeyObject does not need to be listed in the transferList argument.

Static method: KeyObject.from(key)#

Added in: v15.0.0

Example: Converting a CryptoKey instance to a KeyObject:

`const { KeyObject } = await import('node:crypto'); const { subtle } = globalThis.crypto;

const key = await subtle.generateKey({ name: 'HMAC', hash: 'SHA-256', length: 256, }, true, ['sign', 'verify']);

const keyObject = KeyObject.from(key); console.log(keyObject.symmetricKeySize); // Prints: 32 (symmetric key size in bytes) const { KeyObject } = require('node:crypto'); const { subtle } = globalThis.crypto;

(async function() { const key = await subtle.generateKey({ name: 'HMAC', hash: 'SHA-256', length: 256, }, true, ['sign', 'verify']);

const keyObject = KeyObject.from(key); console.log(keyObject.symmetricKeySize); // Prints: 32 (symmetric key size in bytes) })();`

keyObject.asymmetricKeyDetails#

This property exists only on asymmetric keys. Depending on the type of the key, this object contains information about the key. None of the information obtained through this property can be used to uniquely identify a key or to compromise the security of the key.

For RSA-PSS keys, if the key material contains a RSASSA-PSS-params sequence, the hashAlgorithm, mgf1HashAlgorithm, and saltLength properties will be set.

Other key details might be exposed via this API using additional attributes.

keyObject.asymmetricKeyType#

For asymmetric keys, this property represents the type of the key. Supported key types are:

This property is undefined for unrecognized KeyObject types and symmetric keys.

keyObject.equals(otherKeyObject)#

Added in: v17.7.0, v16.15.0

Returns true or false depending on whether the keys have exactly the same type, value, and parameters. This method is notconstant time.

keyObject.export([options])#

For symmetric keys, the following encoding options can be used:

For public keys, the following encoding options can be used:

For private keys, the following encoding options can be used:

The result type depends on the selected encoding format, when PEM the result is a string, when DER it will be a buffer containing the data encoded as DER, when JWK it will be an object.

When JWK encoding format was selected, all other encoding options are ignored.

PKCS#1, SEC1, and PKCS#8 type keys can be encrypted by using a combination of the cipher and format options. The PKCS#8 type can be used with anyformat to encrypt any key algorithm (RSA, EC, or DH) by specifying acipher. PKCS#1 and SEC1 can only be encrypted by specifying a cipherwhen the PEM format is used. For maximum compatibility, use PKCS#8 for encrypted private keys. Since PKCS#8 defines its own encryption mechanism, PEM-level encryption is not supported when encrypting a PKCS#8 key. See RFC 5208 for PKCS#8 encryption and RFC 1421 for PKCS#1 and SEC1 encryption.

keyObject.symmetricKeySize#

Added in: v11.6.0

For secret keys, this property represents the size of the key in bytes. This property is undefined for asymmetric keys.

keyObject.type#

Added in: v11.6.0

Depending on the type of this KeyObject, this property is either'secret' for secret (symmetric) keys, 'public' for public (asymmetric) keys or 'private' for private (asymmetric) keys.

Class: Sign#

Added in: v0.1.92

The Sign class is a utility for generating signatures. It can be used in one of two ways:

The crypto.createSign() method is used to create Sign instances. The argument is the string name of the hash function to use. Sign objects are not to be created directly using the new keyword.

Example: Using Sign and Verify objects as streams:

`const { generateKeyPairSync, createSign, createVerify, } = await import('node:crypto');

const { privateKey, publicKey } = generateKeyPairSync('ec', { namedCurve: 'sect239k1', });

const sign = createSign('SHA256'); sign.write('some data to sign'); sign.end(); const signature = sign.sign(privateKey, 'hex');

const verify = createVerify('SHA256'); verify.write('some data to sign'); verify.end(); console.log(verify.verify(publicKey, signature, 'hex')); // Prints: true const { generateKeyPairSync, createSign, createVerify, } = require('node:crypto');

const { privateKey, publicKey } = generateKeyPairSync('ec', { namedCurve: 'sect239k1', });

const sign = createSign('SHA256'); sign.write('some data to sign'); sign.end(); const signature = sign.sign(privateKey, 'hex');

const verify = createVerify('SHA256'); verify.write('some data to sign'); verify.end(); console.log(verify.verify(publicKey, signature, 'hex')); // Prints: true`

Example: Using the sign.update() and verify.update() methods:

`const { generateKeyPairSync, createSign, createVerify, } = await import('node:crypto');

const { privateKey, publicKey } = generateKeyPairSync('rsa', { modulusLength: 2048, });

const sign = createSign('SHA256'); sign.update('some data to sign'); sign.end(); const signature = sign.sign(privateKey);

const verify = createVerify('SHA256'); verify.update('some data to sign'); verify.end(); console.log(verify.verify(publicKey, signature)); // Prints: true const { generateKeyPairSync, createSign, createVerify, } = require('node:crypto');

const { privateKey, publicKey } = generateKeyPairSync('rsa', { modulusLength: 2048, });

const sign = createSign('SHA256'); sign.update('some data to sign'); sign.end(); const signature = sign.sign(privateKey);

const verify = createVerify('SHA256'); verify.update('some data to sign'); verify.end(); console.log(verify.verify(publicKey, signature)); // Prints: true`

sign.sign(privateKey[, outputEncoding])#

Calculates the signature on all the data passed through using eithersign.update() or sign.write().

If privateKey is not a KeyObject, this function behaves as ifprivateKey had been passed to crypto.createPrivateKey(). If it is an object, the following additional properties can be passed:

If outputEncoding is provided a string is returned; otherwise a Bufferis returned.

The Sign object can not be again used after sign.sign() method has been called. Multiple calls to sign.sign() will result in an error being thrown.

sign.update(data[, inputEncoding])#

Updates the Sign content with the given data, the encoding of which is given in inputEncoding. If encoding is not provided, and the data is a string, an encoding of 'utf8' is enforced. If data is a Buffer, TypedArray, orDataView, then inputEncoding is ignored.

This can be called many times with new data as it is streamed.

Class: Verify#

Added in: v0.1.92

The Verify class is a utility for verifying signatures. It can be used in one of two ways:

The crypto.createVerify() method is used to create Verify instances.Verify objects are not to be created directly using the new keyword.

See Sign for examples.

verify.update(data[, inputEncoding])#

Updates the Verify content with the given data, the encoding of which is given in inputEncoding. If inputEncoding is not provided, and the data is a string, an encoding of 'utf8' is enforced. If data is a Buffer, TypedArray, orDataView, then inputEncoding is ignored.

This can be called many times with new data as it is streamed.

verify.verify(object, signature[, signatureEncoding])#

Verifies the provided data using the given object and signature.

If object is not a KeyObject, this function behaves as ifobject had been passed to crypto.createPublicKey(). If it is an object, the following additional properties can be passed:

The signature argument is the previously calculated signature for the data, in the signatureEncoding. If a signatureEncoding is specified, the signature is expected to be a string; otherwise signature is expected to be a Buffer,TypedArray, or DataView.

The verify object can not be used again after verify.verify() has been called. Multiple calls to verify.verify() will result in an error being thrown.

Because public keys can be derived from private keys, a private key may be passed instead of a public key.

Class: X509Certificate#

Added in: v15.6.0

Encapsulates an X509 certificate and provides read-only access to its information.

`const { X509Certificate } = await import('node:crypto');

const x509 = new X509Certificate('{... pem encoded cert ...}');

console.log(x509.subject); const { X509Certificate } = require('node:crypto');

const x509 = new X509Certificate('{... pem encoded cert ...}');

console.log(x509.subject);`

x509.ca#

Added in: v15.6.0

x509.checkEmail(email[, options])#

Checks whether the certificate matches the given email address.

If the 'subject' option is undefined or set to 'default', the certificate subject is only considered if the subject alternative name extension either does not exist or does not contain any email addresses.

If the 'subject' option is set to 'always' and if the subject alternative name extension either does not exist or does not contain a matching email address, the certificate subject is considered.

If the 'subject' option is set to 'never', the certificate subject is never considered, even if the certificate contains no subject alternative names.

x509.checkHost(name[, options])#

Checks whether the certificate matches the given host name.

If the certificate matches the given host name, the matching subject name is returned. The returned name might be an exact match (e.g., foo.example.com) or it might contain wildcards (e.g., *.example.com). Because host name comparisons are case-insensitive, the returned subject name might also differ from the given name in capitalization.

If the 'subject' option is undefined or set to 'default', the certificate subject is only considered if the subject alternative name extension either does not exist or does not contain any DNS names. This behavior is consistent withRFC 2818 ("HTTP Over TLS").

If the 'subject' option is set to 'always' and if the subject alternative name extension either does not exist or does not contain a matching DNS name, the certificate subject is considered.

If the 'subject' option is set to 'never', the certificate subject is never considered, even if the certificate contains no subject alternative names.

x509.checkIP(ip)#

Checks whether the certificate matches the given IP address (IPv4 or IPv6).

Only RFC 5280 iPAddress subject alternative names are considered, and they must match the given ip address exactly. Other subject alternative names as well as the subject field of the certificate are ignored.

x509.checkIssued(otherCert)#

Added in: v15.6.0

Checks whether this certificate was issued by the given otherCert.

x509.checkPrivateKey(privateKey)#

Added in: v15.6.0

Checks whether the public key for this certificate is consistent with the given private key.

x509.extKeyUsage#

Added in: v15.6.0

An array detailing the key extended usages for this certificate.

x509.fingerprint#

Added in: v15.6.0

The SHA-1 fingerprint of this certificate.

Because SHA-1 is cryptographically broken and because the security of SHA-1 is significantly worse than that of algorithms that are commonly used to sign certificates, consider using x509.fingerprint256 instead.

x509.fingerprint256#

Added in: v15.6.0

The SHA-256 fingerprint of this certificate.

x509.fingerprint512#

Added in: v17.2.0, v16.14.0

The SHA-512 fingerprint of this certificate.

Because computing the SHA-256 fingerprint is usually faster and because it is only half the size of the SHA-512 fingerprint, x509.fingerprint256 may be a better choice. While SHA-512 presumably provides a higher level of security in general, the security of SHA-256 matches that of most algorithms that are commonly used to sign certificates.

x509.infoAccess#

A textual representation of the certificate's authority information access extension.

This is a line feed separated list of access descriptions. Each line begins with the access method and the kind of the access location, followed by a colon and the value associated with the access location.

After the prefix denoting the access method and the kind of the access location, the remainder of each line might be enclosed in quotes to indicate that the value is a JSON string literal. For backward compatibility, Node.js only uses JSON string literals within this property when necessary to avoid ambiguity. Third-party code should be prepared to handle both possible entry formats.

x509.issuer#

Added in: v15.6.0

The issuer identification included in this certificate.

x509.issuerCertificate#

Added in: v15.9.0

The issuer certificate or undefined if the issuer certificate is not available.

x509.raw#

Added in: v15.6.0

A Buffer containing the DER encoding of this certificate.

x509.serialNumber#

Added in: v15.6.0

The serial number of this certificate.

Serial numbers are assigned by certificate authorities and do not uniquely identify certificates. Consider using x509.fingerprint256 as a unique identifier instead.

x509.subject#

Added in: v15.6.0

The complete subject of this certificate.

x509.subjectAltName#

The subject alternative name specified for this certificate.

This is a comma-separated list of subject alternative names. Each entry begins with a string identifying the kind of the subject alternative name followed by a colon and the value associated with the entry.

Earlier versions of Node.js incorrectly assumed that it is safe to split this property at the two-character sequence ', ' (see CVE-2021-44532). However, both malicious and legitimate certificates can contain subject alternative names that include this sequence when represented as a string.

After the prefix denoting the type of the entry, the remainder of each entry might be enclosed in quotes to indicate that the value is a JSON string literal. For backward compatibility, Node.js only uses JSON string literals within this property when necessary to avoid ambiguity. Third-party code should be prepared to handle both possible entry formats.

x509.toJSON()#

Added in: v15.6.0

There is no standard JSON encoding for X509 certificates. ThetoJSON() method returns a string containing the PEM encoded certificate.

x509.toLegacyObject()#

Added in: v15.6.0

Returns information about this certificate using the legacycertificate object encoding.

x509.toString()#

Added in: v15.6.0

Returns the PEM-encoded certificate.

x509.validFrom#

Added in: v15.6.0

The date/time from which this certificate is valid.

x509.validFromDate#

Added in: v23.0.0

The date/time from which this certificate is valid, encapsulated in a Date object.

x509.validTo#

Added in: v15.6.0

The date/time until which this certificate is valid.

x509.validToDate#

Added in: v23.0.0

The date/time until which this certificate is valid, encapsulated in a Date object.

x509.verify(publicKey)#

Added in: v15.6.0

Verifies that this certificate was signed by the given public key. Does not perform any other validation checks on the certificate.

node:crypto module methods and properties#

crypto.checkPrime(candidate[, options], callback)#

Checks the primality of the candidate.

crypto.checkPrimeSync(candidate[, options])#

Added in: v15.8.0

Checks the primality of the candidate.

crypto.constants#

Added in: v6.3.0

An object containing commonly used constants for crypto and security related operations. The specific constants currently defined are described inCrypto constants.

crypto.createCipheriv(algorithm, key, iv[, options])#

Creates and returns a Cipher object, with the given algorithm, key and initialization vector (iv).

The options argument controls stream behavior and is optional except when a cipher in CCM or OCB mode (e.g. 'aes-128-ccm') is used. In that case, theauthTagLength option is required and specifies the length of the authentication tag in bytes, see CCM mode. In GCM mode, the authTagLengthoption is not required but can be used to set the length of the authentication tag that will be returned by getAuthTag() and defaults to 16 bytes. For chacha20-poly1305, the authTagLength option defaults to 16 bytes.

The algorithm is dependent on OpenSSL, examples are 'aes192', etc. On recent OpenSSL releases, openssl list -cipher-algorithms will display the available cipher algorithms.

The key is the raw key used by the algorithm and iv is aninitialization vector. Both arguments must be 'utf8' encoded strings,Buffers, TypedArray, or DataViews. The key may optionally be a KeyObject of type secret. If the cipher does not need an initialization vector, iv may be null.

When passing strings for key or iv, please considercaveats when using strings as inputs to cryptographic APIs.

Initialization vectors should be unpredictable and unique; ideally, they will be cryptographically random. They do not have to be secret: IVs are typically just added to ciphertext messages unencrypted. It may sound contradictory that something has to be unpredictable and unique, but does not have to be secret; remember that an attacker must not be able to predict ahead of time what a given IV will be.

crypto.createDecipheriv(algorithm, key, iv[, options])#

Creates and returns a Decipher object that uses the given algorithm, keyand initialization vector (iv).

The options argument controls stream behavior and is optional except when a cipher in CCM or OCB mode (e.g. 'aes-128-ccm') is used. In that case, theauthTagLength option is required and specifies the length of the authentication tag in bytes, see CCM mode. For AES-GCM and chacha20-poly1305, the authTagLength option defaults to 16 bytes and must be set to a different value if a different length is used.

The algorithm is dependent on OpenSSL, examples are 'aes192', etc. On recent OpenSSL releases, openssl list -cipher-algorithms will display the available cipher algorithms.

The key is the raw key used by the algorithm and iv is aninitialization vector. Both arguments must be 'utf8' encoded strings,Buffers, TypedArray, or DataViews. The key may optionally be a KeyObject of type secret. If the cipher does not need an initialization vector, iv may be null.

When passing strings for key or iv, please considercaveats when using strings as inputs to cryptographic APIs.

Initialization vectors should be unpredictable and unique; ideally, they will be cryptographically random. They do not have to be secret: IVs are typically just added to ciphertext messages unencrypted. It may sound contradictory that something has to be unpredictable and unique, but does not have to be secret; remember that an attacker must not be able to predict ahead of time what a given IV will be.

crypto.createDiffieHellman(prime[, primeEncoding][, generator][, generatorEncoding])#

Creates a DiffieHellman key exchange object using the supplied prime and an optional specific generator.

The generator argument can be a number, string, or Buffer. Ifgenerator is not specified, the value 2 is used.

If primeEncoding is specified, prime is expected to be a string; otherwise a Buffer, TypedArray, or DataView is expected.

If generatorEncoding is specified, generator is expected to be a string; otherwise a number, Buffer, TypedArray, or DataView is expected.

crypto.createDiffieHellman(primeLength[, generator])#

Added in: v0.5.0

Creates a DiffieHellman key exchange object and generates a prime ofprimeLength bits using an optional specific numeric generator. If generator is not specified, the value 2 is used.

crypto.createECDH(curveName)#

Added in: v0.11.14

Creates an Elliptic Curve Diffie-Hellman (ECDH) key exchange object using a predefined curve specified by the curveName string. Usecrypto.getCurves() to obtain a list of available curve names. On recent OpenSSL releases, openssl ecparam -list_curves will also display the name and description of each available elliptic curve.

crypto.createHash(algorithm[, options])#

Creates and returns a Hash object that can be used to generate hash digests using the given algorithm. Optional options argument controls stream behavior. For XOF hash functions such as 'shake256', the outputLength option can be used to specify the desired output length in bytes.

The algorithm is dependent on the available algorithms supported by the version of OpenSSL on the platform. Examples are 'sha256', 'sha512', etc. On recent releases of OpenSSL, openssl list -digest-algorithms will display the available digest algorithms.

Example: generating the sha256 sum of a file

`` import { createReadStream, } from 'node:fs'; import { argv } from 'node:process'; const { createHash, } = await import('node:crypto');

const filename = argv[2];

const hash = createHash('sha256');

const input = createReadStream(filename); input.on('readable', () => { // Only one element is going to be produced by the // hash stream. const data = input.read(); if (data) hash.update(data); else { console.log(${hash.digest('hex')} ${filename}); } }); const { createReadStream, } = require('node:fs'); const { createHash, } = require('node:crypto'); const { argv } = require('node:process');

const filename = argv[2];

const hash = createHash('sha256');

const input = createReadStream(filename); input.on('readable', () => { // Only one element is going to be produced by the // hash stream. const data = input.read(); if (data) hash.update(data); else { console.log(${hash.digest('hex')} ${filename}); } }); ``

crypto.createHmac(algorithm, key[, options])#

Creates and returns an Hmac object that uses the given algorithm and key. Optional options argument controls stream behavior.

The algorithm is dependent on the available algorithms supported by the version of OpenSSL on the platform. Examples are 'sha256', 'sha512', etc. On recent releases of OpenSSL, openssl list -digest-algorithms will display the available digest algorithms.

The key is the HMAC key used to generate the cryptographic HMAC hash. If it is a KeyObject, its type must be secret. If it is a string, please considercaveats when using strings as inputs to cryptographic APIs. If it was obtained from a cryptographically secure source of entropy, such ascrypto.randomBytes() or crypto.generateKey(), its length should not exceed the block size of algorithm (e.g., 512 bits for SHA-256).

Example: generating the sha256 HMAC of a file

`` import { createReadStream, } from 'node:fs'; import { argv } from 'node:process'; const { createHmac, } = await import('node:crypto');

const filename = argv[2];

const hmac = createHmac('sha256', 'a secret');

const input = createReadStream(filename); input.on('readable', () => { // Only one element is going to be produced by the // hash stream. const data = input.read(); if (data) hmac.update(data); else { console.log(${hmac.digest('hex')} ${filename}); } }); const { createReadStream, } = require('node:fs'); const { createHmac, } = require('node:crypto'); const { argv } = require('node:process');

const filename = argv[2];

const hmac = createHmac('sha256', 'a secret');

const input = createReadStream(filename); input.on('readable', () => { // Only one element is going to be produced by the // hash stream. const data = input.read(); if (data) hmac.update(data); else { console.log(${hmac.digest('hex')} ${filename}); } }); ``

crypto.createPrivateKey(key)#

Creates and returns a new key object containing a private key. If key is a string or Buffer, format is assumed to be 'pem'; otherwise, keymust be an object with the properties described above.

If the private key is encrypted, a passphrase must be specified. The length of the passphrase is limited to 1024 bytes.

crypto.createPublicKey(key)#

Creates and returns a new key object containing a public key. If key is a string or Buffer, format is assumed to be 'pem'; if key is a KeyObjectwith type 'private', the public key is derived from the given private key; otherwise, key must be an object with the properties described above.

If the format is 'pem', the 'key' may also be an X.509 certificate.

Because public keys can be derived from private keys, a private key may be passed instead of a public key. In that case, this function behaves as ifcrypto.createPrivateKey() had been called, except that the type of the returned KeyObject will be 'public' and that the private key cannot be extracted from the returned KeyObject. Similarly, if a KeyObject with type'private' is given, a new KeyObject with type 'public' will be returned and it will be impossible to extract the private key from the returned object.

crypto.createSign(algorithm[, options])#

Added in: v0.1.92

Creates and returns a Sign object that uses the given algorithm. Usecrypto.getHashes() to obtain the names of the available digest algorithms. Optional options argument controls the stream.Writable behavior.

In some cases, a Sign instance can be created using the name of a signature algorithm, such as 'RSA-SHA256', instead of a digest algorithm. This will use the corresponding digest algorithm. This does not work for all signature algorithms, such as 'ecdsa-with-SHA256', so it is best to always use digest algorithm names.

crypto.createVerify(algorithm[, options])#

Added in: v0.1.92

Creates and returns a Verify object that uses the given algorithm. Use crypto.getHashes() to obtain an array of names of the available signing algorithms. Optional options argument controls thestream.Writable behavior.

In some cases, a Verify instance can be created using the name of a signature algorithm, such as 'RSA-SHA256', instead of a digest algorithm. This will use the corresponding digest algorithm. This does not work for all signature algorithms, such as 'ecdsa-with-SHA256', so it is best to always use digest algorithm names.

crypto.diffieHellman(options[, callback])#

Computes the Diffie-Hellman secret based on a privateKey and a publicKey. Both keys must have the same asymmetricKeyType, which must be one of 'dh'(for Diffie-Hellman), 'ec', 'x448', or 'x25519' (for ECDH).

If the callback function is provided this function uses libuv's threadpool.

crypto.fips#

Added in: v6.0.0Deprecated since: v10.0.0

Property for checking and controlling whether a FIPS compliant crypto provider is currently in use. Setting to true requires a FIPS build of Node.js.

This property is deprecated. Please use crypto.setFips() andcrypto.getFips() instead.

crypto.generateKey(type, options, callback)#

Asynchronously generates a new random secret key of the given length. Thetype will determine which validations will be performed on the length.

`const { generateKey, } = await import('node:crypto');

generateKey('hmac', { length: 512 }, (err, key) => { if (err) throw err; console.log(key.export().toString('hex')); // 46e..........620 }); const { generateKey, } = require('node:crypto');

generateKey('hmac', { length: 512 }, (err, key) => { if (err) throw err; console.log(key.export().toString('hex')); // 46e..........620 });`

The size of a generated HMAC key should not exceed the block size of the underlying hash function. See crypto.createHmac() for more information.

crypto.generateKeyPair(type, options, callback)#

Generates a new asymmetric key pair of the given type. RSA, RSA-PSS, DSA, EC, Ed25519, Ed448, X25519, X448, and DH are currently supported.

If a publicKeyEncoding or privateKeyEncoding was specified, this function behaves as if keyObject.export() had been called on its result. Otherwise, the respective part of the key is returned as a KeyObject.

It is recommended to encode public keys as 'spki' and private keys as'pkcs8' with encryption for long-term storage:

`const { generateKeyPair, } = await import('node:crypto');

generateKeyPair('rsa', { modulusLength: 4096, publicKeyEncoding: { type: 'spki', format: 'pem', }, privateKeyEncoding: { type: 'pkcs8', format: 'pem', cipher: 'aes-256-cbc', passphrase: 'top secret', }, }, (err, publicKey, privateKey) => { // Handle errors and use the generated key pair. }); const { generateKeyPair, } = require('node:crypto');

generateKeyPair('rsa', { modulusLength: 4096, publicKeyEncoding: { type: 'spki', format: 'pem', }, privateKeyEncoding: { type: 'pkcs8', format: 'pem', cipher: 'aes-256-cbc', passphrase: 'top secret', }, }, (err, publicKey, privateKey) => { // Handle errors and use the generated key pair. });`

On completion, callback will be called with err set to undefined andpublicKey / privateKey representing the generated key pair.

If this method is invoked as its util.promisify()ed version, it returns a Promise for an Object with publicKey and privateKey properties.

crypto.generateKeyPairSync(type, options)#

Generates a new asymmetric key pair of the given type. RSA, RSA-PSS, DSA, EC, Ed25519, Ed448, X25519, X448, and DH are currently supported.

If a publicKeyEncoding or privateKeyEncoding was specified, this function behaves as if keyObject.export() had been called on its result. Otherwise, the respective part of the key is returned as a KeyObject.

When encoding public keys, it is recommended to use 'spki'. When encoding private keys, it is recommended to use 'pkcs8' with a strong passphrase, and to keep the passphrase confidential.

`const { generateKeyPairSync, } = await import('node:crypto');

const { publicKey, privateKey, } = generateKeyPairSync('rsa', { modulusLength: 4096, publicKeyEncoding: { type: 'spki', format: 'pem', }, privateKeyEncoding: { type: 'pkcs8', format: 'pem', cipher: 'aes-256-cbc', passphrase: 'top secret', }, }); const { generateKeyPairSync, } = require('node:crypto');

const { publicKey, privateKey, } = generateKeyPairSync('rsa', { modulusLength: 4096, publicKeyEncoding: { type: 'spki', format: 'pem', }, privateKeyEncoding: { type: 'pkcs8', format: 'pem', cipher: 'aes-256-cbc', passphrase: 'top secret', }, });`

The return value { publicKey, privateKey } represents the generated key pair. When PEM encoding was selected, the respective key will be a string, otherwise it will be a buffer containing the data encoded as DER.

crypto.generateKeySync(type, options)#

Added in: v15.0.0

Synchronously generates a new random secret key of the given length. Thetype will determine which validations will be performed on the length.

`const { generateKeySync, } = await import('node:crypto');

const key = generateKeySync('hmac', { length: 512 }); console.log(key.export().toString('hex')); // e89..........41e const { generateKeySync, } = require('node:crypto');

const key = generateKeySync('hmac', { length: 512 }); console.log(key.export().toString('hex')); // e89..........41e`

The size of a generated HMAC key should not exceed the block size of the underlying hash function. See crypto.createHmac() for more information.

crypto.generatePrime(size[, options[, callback]])#

Generates a pseudorandom prime of size bits.

If options.safe is true, the prime will be a safe prime -- that is,(prime - 1) / 2 will also be a prime.

The options.add and options.rem parameters can be used to enforce additional requirements, e.g., for Diffie-Hellman:

Both options.add and options.rem must be encoded as big-endian sequences if given as an ArrayBuffer, SharedArrayBuffer, TypedArray, Buffer, orDataView.

By default, the prime is encoded as a big-endian sequence of octets in an . If the bigint option is true, then a is provided.

The size of the prime will have a direct impact on how long it takes to generate the prime. The larger the size, the longer it will take. Because we use OpenSSL's BN_generate_prime_ex function, which provides only minimal control over our ability to interrupt the generation process, it is not recommended to generate overly large primes, as doing so may make the process unresponsive.

crypto.generatePrimeSync(size[, options])#

Added in: v15.8.0

Generates a pseudorandom prime of size bits.

If options.safe is true, the prime will be a safe prime -- that is,(prime - 1) / 2 will also be a prime.

The options.add and options.rem parameters can be used to enforce additional requirements, e.g., for Diffie-Hellman:

Both options.add and options.rem must be encoded as big-endian sequences if given as an ArrayBuffer, SharedArrayBuffer, TypedArray, Buffer, orDataView.

By default, the prime is encoded as a big-endian sequence of octets in an . If the bigint option is true, then a is provided.

The size of the prime will have a direct impact on how long it takes to generate the prime. The larger the size, the longer it will take. Because we use OpenSSL's BN_generate_prime_ex function, which provides only minimal control over our ability to interrupt the generation process, it is not recommended to generate overly large primes, as doing so may make the process unresponsive.

crypto.getCipherInfo(nameOrNid[, options])#

Added in: v15.0.0

Returns information about a given cipher.

Some ciphers accept variable length keys and initialization vectors. By default, the crypto.getCipherInfo() method will return the default values for these ciphers. To test if a given key length or iv length is acceptable for given cipher, use the keyLength and ivLength options. If the given values are unacceptable, undefined will be returned.

crypto.getCiphers()#

Added in: v0.9.3

`const { getCiphers, } = await import('node:crypto');

console.log(getCiphers()); // ['aes-128-cbc', 'aes-128-ccm', ...] const { getCiphers, } = require('node:crypto');

console.log(getCiphers()); // ['aes-128-cbc', 'aes-128-ccm', ...]`

crypto.getCurves()#

Added in: v2.3.0

`const { getCurves, } = await import('node:crypto');

console.log(getCurves()); // ['Oakley-EC2N-3', 'Oakley-EC2N-4', ...] const { getCurves, } = require('node:crypto');

console.log(getCurves()); // ['Oakley-EC2N-3', 'Oakley-EC2N-4', ...]`

crypto.getDiffieHellman(groupName)#

Added in: v0.7.5

Creates a predefined DiffieHellmanGroup key exchange object. The supported groups are listed in the documentation for DiffieHellmanGroup.

The returned object mimics the interface of objects created bycrypto.createDiffieHellman(), but will not allow changing the keys (with diffieHellman.setPublicKey(), for example). The advantage of using this method is that the parties do not have to generate nor exchange a group modulus beforehand, saving both processor and communication time.

Example (obtaining a shared secret):

`const { getDiffieHellman, } = await import('node:crypto'); const alice = getDiffieHellman('modp14'); const bob = getDiffieHellman('modp14');

alice.generateKeys(); bob.generateKeys();

const aliceSecret = alice.computeSecret(bob.getPublicKey(), null, 'hex'); const bobSecret = bob.computeSecret(alice.getPublicKey(), null, 'hex');

/* aliceSecret and bobSecret should be the same */ console.log(aliceSecret === bobSecret); const { getDiffieHellman, } = require('node:crypto');

const alice = getDiffieHellman('modp14'); const bob = getDiffieHellman('modp14');

alice.generateKeys(); bob.generateKeys();

const aliceSecret = alice.computeSecret(bob.getPublicKey(), null, 'hex'); const bobSecret = bob.computeSecret(alice.getPublicKey(), null, 'hex');

/* aliceSecret and bobSecret should be the same */ console.log(aliceSecret === bobSecret);`

crypto.getFips()#

Added in: v10.0.0

crypto.getHashes()#

Added in: v0.9.3

`const { getHashes, } = await import('node:crypto');

console.log(getHashes()); // ['DSA', 'DSA-SHA', 'DSA-SHA1', ...] const { getHashes, } = require('node:crypto');

console.log(getHashes()); // ['DSA', 'DSA-SHA', 'DSA-SHA1', ...]`

crypto.hash(algorithm, data[, outputEncoding])#

Added in: v21.7.0, v20.12.0

A utility for creating one-shot hash digests of data. It can be faster than the object-based crypto.createHash() when hashing a smaller amount of data (<= 5MB) that's readily available. If the data can be big or if it is streamed, it's still recommended to use crypto.createHash() instead.

The algorithm is dependent on the available algorithms supported by the version of OpenSSL on the platform. Examples are 'sha256', 'sha512', etc. On recent releases of OpenSSL, openssl list -digest-algorithms will display the available digest algorithms.

Example:

`const crypto = require('node:crypto'); const { Buffer } = require('node:buffer');

// Hashing a string and return the result as a hex-encoded string. const string = 'Node.js'; // 10b3493287f831e81a438811a1ffba01f8cec4b7 console.log(crypto.hash('sha1', string));

// Encode a base64-encoded string into a Buffer, hash it and return // the result as a buffer. const base64 = 'Tm9kZS5qcw=='; // <Buffer 10 b3 49 32 87 f8 31 e8 1a 43 88 11 a1 ff ba 01 f8 ce c4 b7> console.log(crypto.hash('sha1', Buffer.from(base64, 'base64'), 'buffer')); import crypto from 'node:crypto'; import { Buffer } from 'node:buffer';

// Hashing a string and return the result as a hex-encoded string. const string = 'Node.js'; // 10b3493287f831e81a438811a1ffba01f8cec4b7 console.log(crypto.hash('sha1', string));

// Encode a base64-encoded string into a Buffer, hash it and return // the result as a buffer. const base64 = 'Tm9kZS5qcw=='; // <Buffer 10 b3 49 32 87 f8 31 e8 1a 43 88 11 a1 ff ba 01 f8 ce c4 b7> console.log(crypto.hash('sha1', Buffer.from(base64, 'base64'), 'buffer'));`

crypto.hkdf(digest, ikm, salt, info, keylen, callback)#

HKDF is a simple key derivation function defined in RFC 5869. The given ikm,salt and info are used with the digest to derive a key of keylen bytes.

The supplied callback function is called with two arguments: err andderivedKey. If an errors occurs while deriving the key, err will be set; otherwise err will be null. The successfully generated derivedKey will be passed to the callback as an . An error will be thrown if any of the input arguments specify invalid values or types.

`import { Buffer } from 'node:buffer'; const { hkdf, } = await import('node:crypto');

hkdf('sha512', 'key', 'salt', 'info', 64, (err, derivedKey) => { if (err) throw err; console.log(Buffer.from(derivedKey).toString('hex')); // '24156e2...5391653' }); const { hkdf, } = require('node:crypto'); const { Buffer } = require('node:buffer');

hkdf('sha512', 'key', 'salt', 'info', 64, (err, derivedKey) => { if (err) throw err; console.log(Buffer.from(derivedKey).toString('hex')); // '24156e2...5391653' });`

crypto.hkdfSync(digest, ikm, salt, info, keylen)#

Provides a synchronous HKDF key derivation function as defined in RFC 5869. The given ikm, salt and info are used with the digest to derive a key ofkeylen bytes.

The successfully generated derivedKey will be returned as an .

An error will be thrown if any of the input arguments specify invalid values or types, or if the derived key cannot be generated.

`import { Buffer } from 'node:buffer'; const { hkdfSync, } = await import('node:crypto');

const derivedKey = hkdfSync('sha512', 'key', 'salt', 'info', 64); console.log(Buffer.from(derivedKey).toString('hex')); // '24156e2...5391653' const { hkdfSync, } = require('node:crypto'); const { Buffer } = require('node:buffer');

const derivedKey = hkdfSync('sha512', 'key', 'salt', 'info', 64); console.log(Buffer.from(derivedKey).toString('hex')); // '24156e2...5391653'`

crypto.pbkdf2(password, salt, iterations, keylen, digest, callback)#

Provides an asynchronous Password-Based Key Derivation Function 2 (PBKDF2) implementation. A selected HMAC digest algorithm specified by digest is applied to derive a key of the requested byte length (keylen) from thepassword, salt and iterations.

The supplied callback function is called with two arguments: err andderivedKey. If an error occurs while deriving the key, err will be set; otherwise err will be null. By default, the successfully generatedderivedKey will be passed to the callback as a Buffer. An error will be thrown if any of the input arguments specify invalid values or types.

The iterations argument must be a number set as high as possible. The higher the number of iterations, the more secure the derived key will be, but will take a longer amount of time to complete.

The salt should be as unique as possible. It is recommended that a salt is random and at least 16 bytes long. See NIST SP 800-132 for details.

When passing strings for password or salt, please considercaveats when using strings as inputs to cryptographic APIs.

`const { pbkdf2, } = await import('node:crypto');

pbkdf2('secret', 'salt', 100000, 64, 'sha512', (err, derivedKey) => { if (err) throw err; console.log(derivedKey.toString('hex')); // '3745e48...08d59ae' }); const { pbkdf2, } = require('node:crypto');

pbkdf2('secret', 'salt', 100000, 64, 'sha512', (err, derivedKey) => { if (err) throw err; console.log(derivedKey.toString('hex')); // '3745e48...08d59ae' });`

An array of supported digest functions can be retrieved usingcrypto.getHashes().

This API uses libuv's threadpool, which can have surprising and negative performance implications for some applications; see theUV_THREADPOOL_SIZE documentation for more information.

crypto.pbkdf2Sync(password, salt, iterations, keylen, digest)#

Provides a synchronous Password-Based Key Derivation Function 2 (PBKDF2) implementation. A selected HMAC digest algorithm specified by digest is applied to derive a key of the requested byte length (keylen) from thepassword, salt and iterations.

If an error occurs an Error will be thrown, otherwise the derived key will be returned as a Buffer.

The iterations argument must be a number set as high as possible. The higher the number of iterations, the more secure the derived key will be, but will take a longer amount of time to complete.

The salt should be as unique as possible. It is recommended that a salt is random and at least 16 bytes long. See NIST SP 800-132 for details.

When passing strings for password or salt, please considercaveats when using strings as inputs to cryptographic APIs.

`const { pbkdf2Sync, } = await import('node:crypto');

const key = pbkdf2Sync('secret', 'salt', 100000, 64, 'sha512'); console.log(key.toString('hex')); // '3745e48...08d59ae' const { pbkdf2Sync, } = require('node:crypto');

const key = pbkdf2Sync('secret', 'salt', 100000, 64, 'sha512'); console.log(key.toString('hex')); // '3745e48...08d59ae'`

An array of supported digest functions can be retrieved usingcrypto.getHashes().

crypto.privateDecrypt(privateKey, buffer)#

Decrypts buffer with privateKey. buffer was previously encrypted using the corresponding public key, for example using crypto.publicEncrypt().

If privateKey is not a KeyObject, this function behaves as ifprivateKey had been passed to crypto.createPrivateKey(). If it is an object, the padding property can be passed. Otherwise, this function usesRSA_PKCS1_OAEP_PADDING.

Using crypto.constants.RSA_PKCS1_PADDING in crypto.privateDecrypt()requires OpenSSL to support implicit rejection (rsa_pkcs1_implicit_rejection). If the version of OpenSSL used by Node.js does not support this feature, attempting to use RSA_PKCS1_PADDING will fail.

crypto.privateEncrypt(privateKey, buffer)#

Encrypts buffer with privateKey. The returned data can be decrypted using the corresponding public key, for example using crypto.publicDecrypt().

If privateKey is not a KeyObject, this function behaves as ifprivateKey had been passed to crypto.createPrivateKey(). If it is an object, the padding property can be passed. Otherwise, this function usesRSA_PKCS1_PADDING.

crypto.publicEncrypt(key, buffer)#

Encrypts the content of buffer with key and returns a newBuffer with encrypted content. The returned data can be decrypted using the corresponding private key, for example using crypto.privateDecrypt().

If key is not a KeyObject, this function behaves as ifkey had been passed to crypto.createPublicKey(). If it is an object, the padding property can be passed. Otherwise, this function usesRSA_PKCS1_OAEP_PADDING.

Because RSA public keys can be derived from private keys, a private key may be passed instead of a public key.

crypto.randomBytes(size[, callback])#

Generates cryptographically strong pseudorandom data. The size argument is a number indicating the number of bytes to generate.

If a callback function is provided, the bytes are generated asynchronously and the callback function is invoked with two arguments: err and buf. If an error occurs, err will be an Error object; otherwise it is null. Thebuf argument is a Buffer containing the generated bytes.

`` // Asynchronous const { randomBytes, } = await import('node:crypto');

randomBytes(256, (err, buf) => { if (err) throw err; console.log(${buf.length} bytes of random data: ${buf.toString('hex')}); }); // Asynchronous const { randomBytes, } = require('node:crypto');

randomBytes(256, (err, buf) => { if (err) throw err; console.log(${buf.length} bytes of random data: ${buf.toString('hex')}); }); ``

If the callback function is not provided, the random bytes are generated synchronously and returned as a Buffer. An error will be thrown if there is a problem generating the bytes.

`` // Synchronous const { randomBytes, } = await import('node:crypto');

const buf = randomBytes(256); console.log( ${buf.length} bytes of random data: ${buf.toString('hex')}); // Synchronous const { randomBytes, } = require('node:crypto');

const buf = randomBytes(256); console.log( ${buf.length} bytes of random data: ${buf.toString('hex')}); ``

The crypto.randomBytes() method will not complete until there is sufficient entropy available. This should normally never take longer than a few milliseconds. The only time when generating the random bytes may conceivably block for a longer period of time is right after boot, when the whole system is still low on entropy.

This API uses libuv's threadpool, which can have surprising and negative performance implications for some applications; see theUV_THREADPOOL_SIZE documentation for more information.

The asynchronous version of crypto.randomBytes() is carried out in a single threadpool request. To minimize threadpool task length variation, partition large randomBytes requests when doing so as part of fulfilling a client request.

crypto.randomFill(buffer[, offset][, size], callback)#

This function is similar to crypto.randomBytes() but requires the first argument to be a Buffer that will be filled. It also requires that a callback is passed in.

If the callback function is not provided, an error will be thrown.

`import { Buffer } from 'node:buffer'; const { randomFill } = await import('node:crypto');

const buf = Buffer.alloc(10); randomFill(buf, (err, buf) => { if (err) throw err; console.log(buf.toString('hex')); });

randomFill(buf, 5, (err, buf) => { if (err) throw err; console.log(buf.toString('hex')); });

// The above is equivalent to the following: randomFill(buf, 5, 5, (err, buf) => { if (err) throw err; console.log(buf.toString('hex')); }); const { randomFill } = require('node:crypto'); const { Buffer } = require('node:buffer');

const buf = Buffer.alloc(10); randomFill(buf, (err, buf) => { if (err) throw err; console.log(buf.toString('hex')); });

randomFill(buf, 5, (err, buf) => { if (err) throw err; console.log(buf.toString('hex')); });

// The above is equivalent to the following: randomFill(buf, 5, 5, (err, buf) => { if (err) throw err; console.log(buf.toString('hex')); });`

Any ArrayBuffer, TypedArray, or DataView instance may be passed asbuffer.

While this includes instances of Float32Array and Float64Array, this function should not be used to generate random floating-point numbers. The result may contain +Infinity, -Infinity, and NaN, and even if the array contains finite numbers only, they are not drawn from a uniform random distribution and have no meaningful lower or upper bounds.

`import { Buffer } from 'node:buffer'; const { randomFill } = await import('node:crypto');

const a = new Uint32Array(10); randomFill(a, (err, buf) => { if (err) throw err; console.log(Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength) .toString('hex')); });

const b = new DataView(new ArrayBuffer(10)); randomFill(b, (err, buf) => { if (err) throw err; console.log(Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength) .toString('hex')); });

const c = new ArrayBuffer(10); randomFill(c, (err, buf) => { if (err) throw err; console.log(Buffer.from(buf).toString('hex')); }); const { randomFill } = require('node:crypto'); const { Buffer } = require('node:buffer');

const a = new Uint32Array(10); randomFill(a, (err, buf) => { if (err) throw err; console.log(Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength) .toString('hex')); });

const b = new DataView(new ArrayBuffer(10)); randomFill(b, (err, buf) => { if (err) throw err; console.log(Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength) .toString('hex')); });

const c = new ArrayBuffer(10); randomFill(c, (err, buf) => { if (err) throw err; console.log(Buffer.from(buf).toString('hex')); });`

This API uses libuv's threadpool, which can have surprising and negative performance implications for some applications; see theUV_THREADPOOL_SIZE documentation for more information.

The asynchronous version of crypto.randomFill() is carried out in a single threadpool request. To minimize threadpool task length variation, partition large randomFill requests when doing so as part of fulfilling a client request.

crypto.randomFillSync(buffer[, offset][, size])#

Synchronous version of crypto.randomFill().

`import { Buffer } from 'node:buffer'; const { randomFillSync } = await import('node:crypto');

const buf = Buffer.alloc(10); console.log(randomFillSync(buf).toString('hex'));

randomFillSync(buf, 5); console.log(buf.toString('hex'));

// The above is equivalent to the following: randomFillSync(buf, 5, 5); console.log(buf.toString('hex')); const { randomFillSync } = require('node:crypto'); const { Buffer } = require('node:buffer');

const buf = Buffer.alloc(10); console.log(randomFillSync(buf).toString('hex'));

randomFillSync(buf, 5); console.log(buf.toString('hex'));

// The above is equivalent to the following: randomFillSync(buf, 5, 5); console.log(buf.toString('hex'));`

Any ArrayBuffer, TypedArray or DataView instance may be passed asbuffer.

`import { Buffer } from 'node:buffer'; const { randomFillSync } = await import('node:crypto');

const a = new Uint32Array(10); console.log(Buffer.from(randomFillSync(a).buffer, a.byteOffset, a.byteLength).toString('hex'));

const b = new DataView(new ArrayBuffer(10)); console.log(Buffer.from(randomFillSync(b).buffer, b.byteOffset, b.byteLength).toString('hex'));

const c = new ArrayBuffer(10); console.log(Buffer.from(randomFillSync(c)).toString('hex')); const { randomFillSync } = require('node:crypto'); const { Buffer } = require('node:buffer');

const a = new Uint32Array(10); console.log(Buffer.from(randomFillSync(a).buffer, a.byteOffset, a.byteLength).toString('hex'));

const b = new DataView(new ArrayBuffer(10)); console.log(Buffer.from(randomFillSync(b).buffer, b.byteOffset, b.byteLength).toString('hex'));

const c = new ArrayBuffer(10); console.log(Buffer.from(randomFillSync(c)).toString('hex'));`

crypto.randomInt([min, ]max[, callback])#

Return a random integer n such that min <= n < max. This implementation avoids modulo bias.

The range (max - min) must be less than 248. min and max must be safe integers.

If the callback function is not provided, the random integer is generated synchronously.

`` // Asynchronous const { randomInt, } = await import('node:crypto');

randomInt(3, (err, n) => { if (err) throw err; console.log(Random number chosen from (0, 1, 2): ${n}); }); // Asynchronous const { randomInt, } = require('node:crypto');

randomInt(3, (err, n) => { if (err) throw err; console.log(Random number chosen from (0, 1, 2): ${n}); }); ``

`` // Synchronous const { randomInt, } = await import('node:crypto');

const n = randomInt(3); console.log(Random number chosen from (0, 1, 2): ${n}); // Synchronous const { randomInt, } = require('node:crypto');

const n = randomInt(3); console.log(Random number chosen from (0, 1, 2): ${n}); ``

`` // With min argument const { randomInt, } = await import('node:crypto');

const n = randomInt(1, 7); console.log(The dice rolled: ${n}); // With min argument const { randomInt, } = require('node:crypto');

const n = randomInt(1, 7); console.log(The dice rolled: ${n}); ``

crypto.randomUUID([options])#

Added in: v15.6.0, v14.17.0

Generates a random RFC 4122 version 4 UUID. The UUID is generated using a cryptographic pseudorandom number generator.

crypto.scrypt(password, salt, keylen[, options], callback)#

Provides an asynchronous scrypt implementation. Scrypt is a password-based key derivation function that is designed to be expensive computationally and memory-wise in order to make brute-force attacks unrewarding.

The salt should be as unique as possible. It is recommended that a salt is random and at least 16 bytes long. See NIST SP 800-132 for details.

When passing strings for password or salt, please considercaveats when using strings as inputs to cryptographic APIs.

The callback function is called with two arguments: err and derivedKey.err is an exception object when key derivation fails, otherwise err isnull. derivedKey is passed to the callback as a Buffer.

An exception is thrown when any of the input arguments specify invalid values or types.

`const { scrypt, } = await import('node:crypto');

// Using the factory defaults. scrypt('password', 'salt', 64, (err, derivedKey) => { if (err) throw err; console.log(derivedKey.toString('hex')); // '3745e48...08d59ae' }); // Using a custom N parameter. Must be a power of two. scrypt('password', 'salt', 64, { N: 1024 }, (err, derivedKey) => { if (err) throw err; console.log(derivedKey.toString('hex')); // '3745e48...aa39b34' }); const { scrypt, } = require('node:crypto');

// Using the factory defaults. scrypt('password', 'salt', 64, (err, derivedKey) => { if (err) throw err; console.log(derivedKey.toString('hex')); // '3745e48...08d59ae' }); // Using a custom N parameter. Must be a power of two. scrypt('password', 'salt', 64, { N: 1024 }, (err, derivedKey) => { if (err) throw err; console.log(derivedKey.toString('hex')); // '3745e48...aa39b34' });`

crypto.scryptSync(password, salt, keylen[, options])#

Provides a synchronous scrypt implementation. Scrypt is a password-based key derivation function that is designed to be expensive computationally and memory-wise in order to make brute-force attacks unrewarding.

The salt should be as unique as possible. It is recommended that a salt is random and at least 16 bytes long. See NIST SP 800-132 for details.

When passing strings for password or salt, please considercaveats when using strings as inputs to cryptographic APIs.

An exception is thrown when key derivation fails, otherwise the derived key is returned as a Buffer.

An exception is thrown when any of the input arguments specify invalid values or types.

`const { scryptSync, } = await import('node:crypto'); // Using the factory defaults.

const key1 = scryptSync('password', 'salt', 64); console.log(key1.toString('hex')); // '3745e48...08d59ae' // Using a custom N parameter. Must be a power of two. const key2 = scryptSync('password', 'salt', 64, { N: 1024 }); console.log(key2.toString('hex')); // '3745e48...aa39b34' const { scryptSync, } = require('node:crypto'); // Using the factory defaults.

const key1 = scryptSync('password', 'salt', 64); console.log(key1.toString('hex')); // '3745e48...08d59ae' // Using a custom N parameter. Must be a power of two. const key2 = scryptSync('password', 'salt', 64, { N: 1024 }); console.log(key2.toString('hex')); // '3745e48...aa39b34'`

crypto.secureHeapUsed()#

Added in: v15.6.0

crypto.setEngine(engine[, flags])#

Load and set the engine for some or all OpenSSL functions (selected by flags). Support for custom engines in OpenSSL is deprecated from OpenSSL 3.

engine could be either an id or a path to the engine's shared library.

The optional flags argument uses ENGINE_METHOD_ALL by default. The flagsis a bit field taking one of or a mix of the following flags (defined incrypto.constants):

crypto.setFips(bool)#

Added in: v10.0.0

Enables the FIPS compliant crypto provider in a FIPS-enabled Node.js build. Throws an error if FIPS mode is not available.

crypto.sign(algorithm, data, key[, callback])#

Calculates and returns the signature for data using the given private key and algorithm. If algorithm is null or undefined, then the algorithm is dependent upon the key type (especially Ed25519 and Ed448).

If key is not a KeyObject, this function behaves as if key had been passed to crypto.createPrivateKey(). If it is an object, the following additional properties can be passed:

If the callback function is provided this function uses libuv's threadpool.

crypto.timingSafeEqual(a, b)#

This function compares the underlying bytes that represent the givenArrayBuffer, TypedArray, or DataView instances using a constant-time algorithm.

This function does not leak timing information that would allow an attacker to guess one of the values. This is suitable for comparing HMAC digests or secret values like authentication cookies orcapability urls.

a and b must both be Buffers, TypedArrays, or DataViews, and they must have the same byte length. An error is thrown if a and b have different byte lengths.

If at least one of a and b is a TypedArray with more than one byte per entry, such as Uint16Array, the result will be computed using the platform byte order.

When both of the inputs are Float32Arrays orFloat64Arrays, this function might return unexpected results due to IEEE 754 encoding of floating-point numbers. In particular, neither x === y norObject.is(x, y) implies that the byte representations of two floating-point numbers x and y are equal.

Use of crypto.timingSafeEqual does not guarantee that the surrounding code is timing-safe. Care should be taken to ensure that the surrounding code does not introduce timing vulnerabilities.

crypto.verify(algorithm, data, key, signature[, callback])#

Verifies the given signature for data using the given key and algorithm. Ifalgorithm is null or undefined, then the algorithm is dependent upon the key type (especially Ed25519 and Ed448).

If key is not a KeyObject, this function behaves as if key had been passed to crypto.createPublicKey(). If it is an object, the following additional properties can be passed:

The signature argument is the previously calculated signature for the data.

Because public keys can be derived from private keys, a private key or a public key may be passed for key.

If the callback function is provided this function uses libuv's threadpool.

Notes#

Using strings as inputs to cryptographic APIs#

For historical reasons, many cryptographic APIs provided by Node.js accept strings as inputs where the underlying cryptographic algorithm works on byte sequences. These instances include plaintexts, ciphertexts, symmetric keys, initialization vectors, passphrases, salts, authentication tags, and additional authenticated data.

When passing strings to cryptographic APIs, consider the following factors.

Legacy streams API (prior to Node.js 0.10)#

The Crypto module was added to Node.js before there was the concept of a unified Stream API, and before there were Buffer objects for handling binary data. As such, many crypto classes have methods not typically found on other Node.js classes that implement the streamsAPI (e.g. update(), final(), or digest()). Also, many methods accepted and returned 'latin1' encoded strings by default rather than Buffers. This default was changed after Node.js v0.8 to use Buffer objects by default instead.

Support for weak or compromised algorithms#

The node:crypto module still supports some algorithms which are already compromised and are not recommended for use. The API also allows the use of ciphers and hashes with a small key size that are too weak for safe use.

Users should take full responsibility for selecting the crypto algorithm and key size according to their security requirements.

Based on the recommendations of NIST SP 800-131A:

See the reference for other recommendations and details.

Some algorithms that have known weaknesses and are of little relevance in practice are only available through the legacy provider, which is not enabled by default.

CCM mode#

CCM is one of the supported AEAD algorithms. Applications which use this mode must adhere to certain restrictions when using the cipher API:

`import { Buffer } from 'node:buffer'; const { createCipheriv, createDecipheriv, randomBytes, } = await import('node:crypto');

const key = 'keykeykeykeykeykeykeykey'; const nonce = randomBytes(12);

const aad = Buffer.from('0123456789', 'hex');

const cipher = createCipheriv('aes-192-ccm', key, nonce, { authTagLength: 16, }); const plaintext = 'Hello world'; cipher.setAAD(aad, { plaintextLength: Buffer.byteLength(plaintext), }); const ciphertext = cipher.update(plaintext, 'utf8'); cipher.final(); const tag = cipher.getAuthTag();

// Now transmit { ciphertext, nonce, tag }.

const decipher = createDecipheriv('aes-192-ccm', key, nonce, { authTagLength: 16, }); decipher.setAuthTag(tag); decipher.setAAD(aad, { plaintextLength: ciphertext.length, }); const receivedPlaintext = decipher.update(ciphertext, null, 'utf8');

try { decipher.final(); } catch (err) { throw new Error('Authentication failed!', { cause: err }); }

console.log(receivedPlaintext); const { Buffer } = require('node:buffer'); const { createCipheriv, createDecipheriv, randomBytes, } = require('node:crypto');

const key = 'keykeykeykeykeykeykeykey'; const nonce = randomBytes(12);

const aad = Buffer.from('0123456789', 'hex');

const cipher = createCipheriv('aes-192-ccm', key, nonce, { authTagLength: 16, }); const plaintext = 'Hello world'; cipher.setAAD(aad, { plaintextLength: Buffer.byteLength(plaintext), }); const ciphertext = cipher.update(plaintext, 'utf8'); cipher.final(); const tag = cipher.getAuthTag();

// Now transmit { ciphertext, nonce, tag }.

const decipher = createDecipheriv('aes-192-ccm', key, nonce, { authTagLength: 16, }); decipher.setAuthTag(tag); decipher.setAAD(aad, { plaintextLength: ciphertext.length, }); const receivedPlaintext = decipher.update(ciphertext, null, 'utf8');

try { decipher.final(); } catch (err) { throw new Error('Authentication failed!', { cause: err }); }

console.log(receivedPlaintext);`

FIPS mode#

When using OpenSSL 3, Node.js supports FIPS 140-2 when used with an appropriate OpenSSL 3 provider, such as the FIPS provider from OpenSSL 3 which can be installed by following the instructions in OpenSSL's FIPS README file.

For FIPS support in Node.js you will need:

Node.js will need to be configured with an OpenSSL configuration file that points to the FIPS provider. An example configuration file looks like this:

`nodejs_conf = nodejs_init

.include //fipsmodule.cnf

[nodejs_init] providers = provider_sect

[provider_sect] default = default_sect

The fips section name should match the section name inside the

included fipsmodule.cnf.

fips = fips_sect

[default_sect] activate = 1`

where fipsmodule.cnf is the FIPS module configuration file generated from the FIPS provider installation step:

openssl fipsinstall

Set the OPENSSL_CONF environment variable to point to your configuration file and OPENSSL_MODULES to the location of the FIPS provider dynamic library. e.g.

export OPENSSL_CONF=/<path to configuration file>/nodejs.cnf export OPENSSL_MODULES=/<path to openssl lib>/ossl-modules

FIPS mode can then be enabled in Node.js either by:

Optionally FIPS mode can be enabled in Node.js via the OpenSSL configuration file. e.g.

`nodejs_conf = nodejs_init

.include //fipsmodule.cnf

[nodejs_init] providers = provider_sect alg_section = algorithm_sect

[provider_sect] default = default_sect

The fips section name should match the section name inside the

included fipsmodule.cnf.

fips = fips_sect

[default_sect] activate = 1

[algorithm_sect] default_properties = fips=yes`

Crypto constants#

The following constants exported by crypto.constants apply to various uses of the node:crypto, node:tls, and node:https modules and are generally specific to OpenSSL.

OpenSSL options#

See the list of SSL OP Flags for details.

Constant Description
SSL_OP_ALL Applies multiple bug workarounds within OpenSSL. Seehttps://www.openssl.org/docs/man3.0/man3/SSL_CTX_set_options.html for detail.
SSL_OP_ALLOW_NO_DHE_KEX Instructs OpenSSL to allow a non-[EC]DHE-based key exchange mode for TLS v1.3
SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION Allows legacy insecure renegotiation between OpenSSL and unpatched clients or servers. Seehttps://www.openssl.org/docs/man3.0/man3/SSL_CTX_set_options.html.
SSL_OP_CIPHER_SERVER_PREFERENCE Attempts to use the server's preferences instead of the client's when selecting a cipher. Behavior depends on protocol version. Seehttps://www.openssl.org/docs/man3.0/man3/SSL_CTX_set_options.html.
SSL_OP_CISCO_ANYCONNECT Instructs OpenSSL to use Cisco's version identifier of DTLS_BAD_VER.
SSL_OP_COOKIE_EXCHANGE Instructs OpenSSL to turn on cookie exchange.
SSL_OP_CRYPTOPRO_TLSEXT_BUG Instructs OpenSSL to add server-hello extension from an early version of the cryptopro draft.
SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS Instructs OpenSSL to disable a SSL 3.0/TLS 1.0 vulnerability workaround added in OpenSSL 0.9.6d.
SSL_OP_LEGACY_SERVER_CONNECT Allows initial connection to servers that do not support RI.
SSL_OP_NO_COMPRESSION Instructs OpenSSL to disable support for SSL/TLS compression.
SSL_OP_NO_ENCRYPT_THEN_MAC Instructs OpenSSL to disable encrypt-then-MAC.
SSL_OP_NO_QUERY_MTU
SSL_OP_NO_RENEGOTIATION Instructs OpenSSL to disable renegotiation.
SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION Instructs OpenSSL to always start a new session when performing renegotiation.
SSL_OP_NO_SSLv2 Instructs OpenSSL to turn off SSL v2
SSL_OP_NO_SSLv3 Instructs OpenSSL to turn off SSL v3
SSL_OP_NO_TICKET Instructs OpenSSL to disable use of RFC4507bis tickets.
SSL_OP_NO_TLSv1 Instructs OpenSSL to turn off TLS v1
SSL_OP_NO_TLSv1_1 Instructs OpenSSL to turn off TLS v1.1
SSL_OP_NO_TLSv1_2 Instructs OpenSSL to turn off TLS v1.2
SSL_OP_NO_TLSv1_3 Instructs OpenSSL to turn off TLS v1.3
SSL_OP_PRIORITIZE_CHACHA Instructs OpenSSL server to prioritize ChaCha20-Poly1305 when the client does. This option has no effect ifSSL_OP_CIPHER_SERVER_PREFERENCE is not enabled.
SSL_OP_TLS_ROLLBACK_BUG Instructs OpenSSL to disable version rollback attack detection.

OpenSSL engine constants#

Constant Description
ENGINE_METHOD_RSA Limit engine usage to RSA
ENGINE_METHOD_DSA Limit engine usage to DSA
ENGINE_METHOD_DH Limit engine usage to DH
ENGINE_METHOD_RAND Limit engine usage to RAND
ENGINE_METHOD_EC Limit engine usage to EC
ENGINE_METHOD_CIPHERS Limit engine usage to CIPHERS
ENGINE_METHOD_DIGESTS Limit engine usage to DIGESTS
ENGINE_METHOD_PKEY_METHS Limit engine usage to PKEY_METHS
ENGINE_METHOD_PKEY_ASN1_METHS Limit engine usage to PKEY_ASN1_METHS
ENGINE_METHOD_ALL
ENGINE_METHOD_NONE

Other OpenSSL constants#

Constant Description
DH_CHECK_P_NOT_SAFE_PRIME
DH_CHECK_P_NOT_PRIME
DH_UNABLE_TO_CHECK_GENERATOR
DH_NOT_SUITABLE_GENERATOR
RSA_PKCS1_PADDING
RSA_SSLV23_PADDING
RSA_NO_PADDING
RSA_PKCS1_OAEP_PADDING
RSA_X931_PADDING
RSA_PKCS1_PSS_PADDING
RSA_PSS_SALTLEN_DIGEST Sets the salt length for RSA_PKCS1_PSS_PADDING to the digest size when signing or verifying.
RSA_PSS_SALTLEN_MAX_SIGN Sets the salt length for RSA_PKCS1_PSS_PADDING to the maximum permissible value when signing data.
RSA_PSS_SALTLEN_AUTO Causes the salt length for RSA_PKCS1_PSS_PADDING to be determined automatically when verifying a signature.
POINT_CONVERSION_COMPRESSED
POINT_CONVERSION_UNCOMPRESSED
POINT_CONVERSION_HYBRID

Node.js crypto constants#

Constant Description
defaultCoreCipherList Specifies the built-in default cipher list used by Node.js.
defaultCipherList Specifies the active default cipher list used by the current Node.js process.