DESedeKeySpec (Java SE 11 & JDK 11 ) (original) (raw)

• java.lang.Object

• • javax.crypto.spec.DESedeKeySpec

• All Implemented Interfaces:
  [KeySpec](../../../java/security/spec/KeySpec.html "interface in java.security.spec")

public class DESedeKeySpec
extends Object
implements KeySpec
This class specifies a DES-EDE ("triple-DES") key.
Since:
1.4

• • Field Summary

  Fields

  Modifier and Type	Field	Description
  static int	DES_EDE_KEY_LEN	The constant which defines the length of a DESede key in bytes.

  • Constructor Summary

  Constructors

  Constructor	Description
  DESedeKeySpec​(byte[] key)	Creates a DESedeKeySpec object using the first 24 bytes inkey as the key material for the DES-EDE key.
  DESedeKeySpec​(byte[] key, int offset)	Creates a DESedeKeySpec object using the first 24 bytes inkey, beginning at offset inclusive, as the key material for the DES-EDE key.

  • Method Summary

  All Methods Static Methods Instance Methods Concrete Methods

  Modifier and Type	Method	Description
  byte[]	getKey()	Returns the DES-EDE key.
  static boolean	isParityAdjusted​(byte[] key, int offset)	Checks if the given DES-EDE key, starting at offset inclusive, is parity-adjusted.

     * ### Methods declared in class java.lang.[Object](../../../java/lang/Object.html "class in java.lang")  
     `[clone](../../../java/lang/Object.html#clone%28%29), [equals](../../../java/lang/Object.html#equals%28java.lang.Object%29), [finalize](../../../java/lang/Object.html#finalize%28%29), [getClass](../../../java/lang/Object.html#getClass%28%29), [hashCode](../../../java/lang/Object.html#hashCode%28%29), [notify](../../../java/lang/Object.html#notify%28%29), [notifyAll](../../../java/lang/Object.html#notifyAll%28%29), [toString](../../../java/lang/Object.html#toString%28%29), [wait](../../../java/lang/Object.html#wait%28%29), [wait](../../../java/lang/Object.html#wait%28long%29), [wait](../../../java/lang/Object.html#wait%28long,int%29)`

• • Field Detail

     * #### DES\_EDE\_KEY\_LEN  
     public static final int DES_EDE_KEY_LEN  
     The constant which defines the length of a DESede key in bytes.  
     See Also:  
     [Constant Field Values](../../../../constant-values.html#javax.crypto.spec.DESedeKeySpec.DES%5FEDE%5FKEY%5FLEN)  

  • Constructor Detail

    * #### DESedeKeySpec  
    public DESedeKeySpec​(byte[] key)  
                  throws [InvalidKeyException](../../../java/security/InvalidKeyException.html "class in java.security")  
    Creates a DESedeKeySpec object using the first 24 bytes in`key` as the key material for the DES-EDE key.  
     The bytes that constitute the DES-EDE key are those between`key[0]` and `key[23]` inclusive  
    Parameters:  
    `key` \- the buffer with the DES-EDE key material. The first 24 bytes of the buffer are copied to protect against subsequent modification.  
    Throws:  
    `[NullPointerException](../../../java/lang/NullPointerException.html "class in java.lang")` \- if `key` is null.  
    `[InvalidKeyException](../../../java/security/InvalidKeyException.html "class in java.security")` \- if the given key material is shorter than 24 bytes.  
    * #### DESedeKeySpec  
    public DESedeKeySpec​(byte[] key,  
                         int offset)  
                  throws [InvalidKeyException](../../../java/security/InvalidKeyException.html "class in java.security")  
    Creates a DESedeKeySpec object using the first 24 bytes in`key`, beginning at `offset` inclusive, as the key material for the DES-EDE key.  
     The bytes that constitute the DES-EDE key are those between`key[offset]` and `key[offset+23]` inclusive.  
    Parameters:  
    `key` \- the buffer with the DES-EDE key material. The first 24 bytes of the buffer beginning at `offset` inclusive are copied to protect against subsequent modification.  
    `offset` \- the offset in `key`, where the DES-EDE key material starts.  
    Throws:  
    `[NullPointerException](../../../java/lang/NullPointerException.html "class in java.lang")` \- if `key` is null.  
    `[InvalidKeyException](../../../java/security/InvalidKeyException.html "class in java.security")` \- if the given key material, starting at`offset` inclusive, is shorter than 24 bytes  

  • Method Detail

    * #### getKey  
    public byte[] getKey()  
    Returns the DES-EDE key.  
    Returns:  
    the DES-EDE key. Returns a new array each time this method is called.  
    * #### isParityAdjusted  
    public static boolean isParityAdjusted​(byte[] key,  
                                           int offset)  
                                    throws [InvalidKeyException](../../../java/security/InvalidKeyException.html "class in java.security")  
    Checks if the given DES-EDE key, starting at `offset` inclusive, is parity-adjusted.  
    Parameters:  
    `key` \- a byte array which holds the key value  
    `offset` \- the offset into the byte array  
    Returns:  
    true if the given DES-EDE key is parity-adjusted, false otherwise  
    Throws:  
    `[NullPointerException](../../../java/lang/NullPointerException.html "class in java.lang")` \- if `key` is null.  
    `[InvalidKeyException](../../../java/security/InvalidKeyException.html "class in java.security")` \- if the given key material, starting at`offset` inclusive, is shorter than 24 bytes

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