mcrypt_get_key_size Gets the key size of the specified cipher &reftitle.description; intmcrypt_get_key_size intcipher intmcrypt_get_key_size stringcipher stringmode 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. &reftitle.parameters; cipher &mcrypt.parameter.cipher; mode &mcrypt.parameter.mode; &reftitle.returnvalues; Returns the maximum supported key size of the algorithm in bytes &return.falseforfailure;. &reftitle.examples; ]]> The example above shows how to use this function when linked against libmcrypt 2.4.x or 2.5.x. &example.outputs; &reftitle.seealso; mcrypt_get_block_size mcrypt_enc_get_key_size mcrypt_encrypt