function mcrypt-get-block-size - Gets the block size of the specified cipher

int mcrypt_get_block_size ( int $cipher )

int mcrypt_get_block_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_block_size() is used to get the size of a block of the specified cipher (in combination with an encryption mode).

It is more useful to use the mcrypt_enc_get_block_size() function as this uses the resource returned by mcrypt_module_open().

cipher: One of the MCRYPT_ciphername constants or the name of the algorithm as string.
module: The module.

Gets the block size, as an integer.

Example #1 mcrypt_get_block_size() example

This example shows how to use this function when linked against libmcrypt 2.4.x and 2.5.x.

 <?php

echo mcrypt_get_block_size('tripledes', 'ecb'); // 8

?>

mcrypt_get_block_size