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# mcrypt_get_key_size

(PHP 3>= 3.0.8, 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().

Beispiel 1. mcrypt_get_block_size() example
`<?php echo mcrypt_get_key_size('tripledes', 'ecb'); ?> Prints: 24`

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

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