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

Avviso

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.

Descrizione

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().

Elenco dei parametri

cipher

Una tra le costanti MCRYPT_ciphername, oppure il nome dell'algoritmo sotto forma di stringa.

mode

Una tra le costanti MCRYPT_MODE_modename, oppure una tra le seguenti stringhe: "ecb", "cbc", "cfb", "ofb", "nofb" o "stream".

Valori restituiti

Returns the maximum supported key size of the algorithm in bytes o false in caso di fallimento.

Esempi

Example #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.

Il precedente esempio visualizzerĂ :

24

Vedere anche:

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Robin
12 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.
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