mcrypt_get_block_size

(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

Aviso

Esta função tornou-se DEFASADA a partir do PHP 7.1.0 e foi REMOVIDA a partir do PHP 7.2.0. O uso desta função é fortemente desencorajado.

Descrição

mcrypt_get_block_size(int $cipher): int|false

mcrypt_get_block_size(string $cipher, string $mode): int|false

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().

Parâmetros

cipher: Uma das constantes MCRYPT_nome_da_cifra ou o nome do algoritmo como string.
mode: Uma das constantes MCRYPT_MODE_nome_do_modo ou uma das seguintes strings: "ecb", "cbc", "cfb", "ofb", "nofb" ou "stream".

Valor Retornado

Returns the algorithm block size in bytes ou false em caso de falha.

Exemplos

Exemplo #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

?>

Veja Também

mcrypt_get_key_size() - Gets the key size of the specified cipher
mcrypt_enc_get_block_size() - Returns the blocksize of the opened algorithm
mcrypt_encrypt() - Encrypts plaintext with given parameters

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User Contributed Notes 1 note

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mehaase at gmail dot com ¶

10 years ago


You should explain that the block size is return in BYTES, not the more commonly used unit, bits. Many readers are not going to know the DES block size and figure this out on their own.

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