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PHP mcrypt_decrypt

PHP original manual for mcrypt_decrypt [ show | php.net ]

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

mcrypt_decrypt — Decrypts crypttext with given parameters

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.

string mcrypt_decrypt ( string $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 the provided key size is not supported by the cipher, the function will emit a warning and return FALSE
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: Used for the initialization in CBC, CFB, OFB modes, and in some algorithms in STREAM mode. If the provided IV size is not supported by the chaining mode or no IV was provided, but the chaining mode requires one, the function will emit a warning and return FALSE.

Returns the decrypted data as a string or FALSE on failure.

Version	Description
5.6.0	Invalid `key` and `iv` sizes are no longer accepted. mcrypt_decrypt() will now throw a warning and return `FALSE` if the inputs are invalid. Previously keys and IVs were padded with '\0' bytes to the next valid size.