This function encrypts data (original) (raw)

mcrypt_generic

(PHP 4 >= 4.0.2, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0)

mcrypt_generic — This function encrypts data

Warning

This function has been_DEPRECATED_ as of PHP 7.1.0 and_REMOVED_ as of PHP 7.2.0. Relying on this function is highly discouraged.

Description

mcrypt_generic ( resource $td , string $data ) : string

If you want to store the encrypted data in a database make sure to store the entire string as returned by mcrypt_generic, or the string will not entirely decrypt properly. If your original string is 10 characters long and the block size is 8 (usemcrypt_enc_get_block_size() to determine the blocksize), you would need at least 16 characters in your database field. Note the string returned by mdecrypt_generic() will be 16 characters as well...use rtrim($str, "\0") to remove the padding.

If you are for example storing the data in a MySQL database remember that varchar fields automatically have trailing spaces removed during insertion. As encrypted data can end in a space (ASCII 32), the data will be damaged by this removal. Store data in a tinyblob/tinytext (or larger) field instead.

Parameters

td

The encryption descriptor.

The encryption handle should always be initialized withmcrypt_generic_init() with a key and an IV before calling this function. Where the encryption is done, you should free the encryption buffers by calling mcrypt_generic_deinit(). See mcrypt_module_open() for an example.

data

The data to encrypt.

Return Values

Returns the encrypted data.

See Also