(PHP 4 >= 4.0.2, PHP 5, PHP 7) Returns the size of the IV of the opened algorithm

(PHP 4, PHP 5) Encrypts/decrypts data in CFB mode

(PHP 4, PHP 5, PHP 7) Creates an initialization vector (IV) from a random source

(PHP 4 >= 4.0.2, PHP 5) This function terminates encryption

(PHP 4, PHP 5) Encrypts/decrypts data in OFB mode

(PHP 5 >= 5.6.0, PHP 7) Verifies a signed public key and challenge

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Encrypts data with public key

(PHP 4, PHP 5, PHP 7) Gets the block size of the specified cipher

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Parse an X.509 certificate and return a resource identifier for it