MCRYPT_GET_KEY_SIZE(3) 1 MCRYPT_GET_KEY_SIZE(3)
mcrypt_get_key_size - Gets the key size of the specified cipher
SYNOPSIS
int mcrypt_get_key_size (int $cipher)
DESCRIPTION
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(3) 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(3) function as this uses the resource returned by mcrypt_module_open(3).
PARAMETERS
o $cipher
-One of the MCRYPT_ciphername constants, or the name of the algorithm as string.
o $mode
-One of the MCRYPT_MODE_modename constants, or one of the following strings: "ecb", "cbc", "cfb", "ofb", "nofb" or "stream".
RETURN VALUES
Returns the maximum supported key size of the algorithm in bytes or FALSE on failure.
EXAMPLES
Example #1
mcrypt_get_key_size(3) 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.
The above example will output:
24
SEE ALSO
mcrypt_get_block_size(3), mcrypt_enc_get_key_size(3), mcrypt_encrypt(3).
PHP Documentation Group MCRYPT_GET_KEY_SIZE(3)
