mcrypt_get_key_size
(PHP 4, PHP 5)
mcrypt_get_key_size — Gets the key size of the specified cipher
说明
int mcrypt_get_key_size ( int $cipher ) int mcrypt_get_key_size ( string $cipher , string $module )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().
范例
Example #1 mcrypt_get_key_size() Example
The example above shows how to use this function when
linked against libmcrypt 2.4.x or 2.5.x.
以上例程会输出：
<?php
echo mcrypt_get_key_size('tripledes', 'ecb');
?>
24
参见
- 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
