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PHP mcrypt_get_key_size

PHP original manual for mcrypt_get_key_size [ show | php.net ]


(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


This function has been DEPRECATED as of PHP 7.1.0. Relying on this function is highly discouraged.


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().



One of the MCRYPT_ciphername constants, or the name of the algorithm as string.


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.


Example #1 mcrypt_get_key_size() Example

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