PHP 5.4.33 Released

mcrypt_get_key_size

(PHP 4, PHP 5)

mcrypt_get_key_sizeGets the key size of the specified cipher

Descrição

int mcrypt_get_key_size ( int $cipher )
int mcrypt_get_key_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_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

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".

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
4 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