(PHP 4 >= 4.0.2, PHP 5)
mcrypt_decrypt — Decrypts crypttext with given parameters
$cipher
, string $key
, string $data
, string $mode
[, string $iv
] )
Decrypts the data and returns the unencrypted data.
cipher
One of the MCRYPT_ciphername constants,
or the name of the algorithm as string.
key
The key with which the data was encrypted. If it's smaller than the required keysize, it is padded with '\0'.
data
The data that will be decrypted with the given cipher
and mode. If the size of the data is not n * blocksize,
the data will be padded with '\0'.
mode
One of the MCRYPT_MODE_modename constants,
or one of the following strings: "ecb", "cbc", "cfb", "ofb",
"nofb" or "stream".
iv
The iv parameter is used for the initialization
in CBC, CFB, OFB modes, and in some algorithms in STREAM mode. If you
do not supply an IV, while it is needed for an algorithm, the function
issues a warning and uses an IV with all its bytes set to
'\0'.
Returns the decrypted data as a string.