mcrypt_get_key_size Get the key size of the specified cipher intmcrypt_get_key_size intcipher intmcrypt_get_key_size stringcipher stringmodule 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). This example shows how to use this function when linked against libmcrypt 2.4.x and 2.5.x. Prints: 24 ]]> See also: mcrypt_get_block_size and mcrypt_encrypt.