mcrypt_decrypt

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

mcrypt_decrypt — Decrypts crypttext with given parameters

Avviso

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.

mcrypt_decrypt(
    string $cipher,
    string $key,
    string $data,
    string $mode,
    string $iv = ?
): string|false

Decrypts the data and returns the unencrypted data.

cipher: Una tra le costanti MCRYPT_ciphername, oppure il nome dell'algoritmo sotto forma di stringa.
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: Una tra le costanti MCRYPT_MODE_modename, oppure una tra le seguenti stringhe: "ecb", "cbc", "cfb", "ofb", "nofb" o "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 o false in caso di fallimento.