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. It is more useful to use the mcrypt_enc_get_key_size function as this uses the resource returned by mcrypt_module_open. Prints: 24 ]]> See also: mcrypt_get_block_size, mcrypt_end_get_key_size and mcrypt_encrypt.