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PHP mcrypt_get_block_size

PHP original manual for mcrypt_get_block_size [ show | php.net ]

(PHP 4, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0)

mcrypt_get_block_size — Gets the block size of the specified cipher

Warning

This function has been DEPRECATED as of PHP 7.1.0. Relying on this function is highly discouraged.

int mcrypt_get_block_size ( int $cipher )

int mcrypt_get_block_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_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.
mode: One of the MCRYPT_MODE_modename constants, or one of the following strings: "ecb", "cbc", "cfb", "ofb", "nofb" or "stream".

Returns the algorithm block size in bytes or FALSE on failure.

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

?>