   #PHP Manual Mcrypt Encryption Functions mcrypt_create_iv mcrypt_ecb

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                                mcrypt_decrypt

   (PHP 4 >= 4.0.2)
   mcrypt_decrypt -- Decrypts crypttext with given parameters

Description

   string mcrypt_decrypt ( string cipher, string key, string data, string
   mode [, string iv])

   mcrypt_decrypt() decrypts the data and returns the unencrypted data.

   Cipher is one of the MCRYPT_ciphername constants of the name of the
   algorithm as string.

   Key is the key with which the data is encrypted. If it's smaller that
   the required keysize, it is padded with '\0'.

   Data is 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 is one of the MCRYPT_MODE_modename constants of one of "ecb",
   "cbc", "cfb", "ofb", "nofb" or "stream".

   The IV parameter is used for the initialisation 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 bytes set to '\0'.
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