PHP 7.4.13 Released!

mcrypt_get_key_size

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

mcrypt_get_key_sizeGets the key size of the specified cipher

Aviso

This function has been DEPRECATED as of PHP 7.1.0 and REMOVED as of PHP 7.2.0. Relying on this function is highly discouraged.

Descrição

mcrypt_get_key_size ( int $cipher ) : int|false
mcrypt_get_key_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_key_size() is used to get the size of a key of the specified cipher (in combination with an encryption mode).

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

Parâmetros

cipher

Uma das constantes MCRYPT_ciphername, ou o nome do algoritmo como string.

mode

Uma das constantes MCRYPT_MODE_modename, ou uma das strings: "ecb", "cbc", "cfb", "ofb", "nofb" ou "stream".

Valor Retornado

Returns the maximum supported key size of the algorithm in bytes ou FALSE em caso de falha.

Exemplos

Exemplo #1 mcrypt_get_key_size() Example

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

The example above shows how to use this function when linked against libmcrypt 2.4.x or 2.5.x.

O exemplo acima irá imprimir:

24

Veja Também

add a note add a note

User Contributed Notes 1 note

up
1
Robin
10 years ago
While not specified in the description, this function, just like mcrypt_enc_get_key_size(), returns the cipher's largest key size in BYTES.
To Top