mcrypt_get_key_size

Get the key size of the specified cipher (PHP 3>= 3.0.8, PHP 4 )
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.

Example 533. mcrypt_get_block_size() example

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<?php
   echo mcrypt_get_key_size ('tripledes', 'ecb');
?>

Prints:
24

See also: mcrypt_get_block_size() and mcrypt_encrypt().

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