mcrypt_get_key_size

(PHP 4, PHP 5, PHP 7)

mcrypt_get_key_sizeGets the key size of the specified cipher

설명

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().

인수

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".

반환값

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

예제

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:

24

참고

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User Contributed Notes 1 note

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Robin
12 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.
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