Get the key size of the specified cipher

mcrypt_get_iv_size
mcrypt_list_algorithms
Mcrypt Functions
PHP Manual

# mcrypt_get_key_size

(PHP 4, PHP 5)

mcrypt_get_key_size — Get the key size of the specified cipher

### Description

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).

This example shows how to use this function when linked against libmcrypt 2.4.x and 2.5.x. It is more useful to use the mcrypt_enc_get_key_size() function as this uses the resource returned by mcrypt_module_open().

Example #1 mcrypt_get_key_size() example

`<?php
echo mcrypt_get_key_size('tripledes', 'ecb');
?>
Prints:
24`

See also: mcrypt_get_block_size(), mcrypt_enc_get_key_size() and mcrypt_encrypt().

mcrypt_get_iv_size
mcrypt_list_algorithms
Mcrypt Functions
PHP Manual