(PHP 4 >= 4.0.2, PHP 5, PHP 7) Returns the blocksize of the specified algorithm

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

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

(PHP 5 >= 5.3.0, PHP 7) Gets available digest methods

(PHP 7) Generates cryptographically secure pseudo-random bytes

(PHP 5 >= 5.3.0, PHP 7) Decrypts data string

(PHP 4 >= 4.0.2, PHP 5, PHP 7) Checks whether the encryption of the opened mode works on blocks

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

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Sign an S/MIME message