Gets the key size of the specified cipher (original) (raw)

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

Warning

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.

Description

mcrypt_get_key_size ( int $cipher ) : int

mcrypt_get_key_size ( string $cipher , string $mode ) : int

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().

Parameters

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".

Return Values

Returns the maximum supported key size of the algorithm in bytes or FALSE on failure.

Examples

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.

The above example will output:

See Also