(PHP 4, PHP 5, PHP 7)
mcrypt_get_key_size — Gets the key size of the specified cipher
$cipher
)$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().
cipherUma das constantes MCRYPT_ciphername, ou o nome do algoritmo como string.
modeUma das constantes MCRYPT_MODE_modename, ou uma das strings: "ecb", "cbc", "cfb", "ofb", "nofb" ou "stream".
Returns the maximum supported key size of the algorithm in bytes
ou FALSE em caso de falha.
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:
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