mcrypt_get_key_size

(PHP 4, PHP 5, PHP 7)

mcrypt_get_key_size — Gets the key size of the specified cipher

int mcrypt_get_key_size ( int $cipher )

int mcrypt_get_key_size ( string $cipher , string $mode )

The first prototype is when linked against libmcrypt 2.2.x, the second when linked against libmcrypt 2.4.x or 2.5.x.

mcrypt_get_key_size() is used to get the size of a key of the specified cipher (in combination with an encryption mode).

It is more useful to use the mcrypt_enc_get_key_size() function as this uses the resource returned by mcrypt_module_open().

cipher: Одна из констант MCRYPT_ciphername или название алгоритма в виде строки.
mode: Одна из констант MCRYPT_MODE_modename, либо одна из следующих строк: "ecb", "cbc", "cfb", "ofb", "nofb" и "stream".

Returns the maximum supported key size of the algorithm in bytes или FALSE в случае возникновения ошибки.

Пример #1 mcrypt_get_key_size() Example


<?php
    echo mcrypt_get_key_size('tripledes', 'ecb');
?>

The example above shows how to use this function when linked against libmcrypt 2.4.x or 2.5.x.

Результат выполнения данного примера:

mcrypt_get_block_size() - Gets the block size of the specified cipher
mcrypt_enc_get_key_size() - Returns the maximum supported keysize of the opened mode
mcrypt_encrypt() - Encrypts plaintext with given parameters

Коментарии

Автор: Robin


While not specified in the description, this function, just like mcrypt_enc_get_key_size(), returns the cipher's largest key size in BYTES.

2010-03-09 06:43:36