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: MCRYPT_ciphername 상수 중 하나이거나, 알고리즘 이름 문자열.
mode: MCRYPT_MODE_modename 상수 중 하나이거나, 다음 문자열 중 하나: "ecb", "cbc", "cfb", "ofb", "nofb" or "stream".

Returns the maximum supported key size of the algorithm in bytes 실패 시 FALSE를 반환합니다.

Example #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.

위 예제의 출력:

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

down

Robin ¶

14 years ago


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