mcrypt_get_key_size

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

mcrypt_get_key_size — Gets the key size of the specified cipher

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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.

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().

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".

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

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 visualizzerà:

mcrypt_get_block_size() - Gets the block size of the specified cipher
mcrypt_enc_get_key_size() - Returns the maximum supported keysize of the opened mode
mcrypt_encrypt() - Encrypts plaintext with given parameters

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Robin ¶

14 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.