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

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

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

(PHP 4 >= 4.0.2, PHP 5, PHP 7) Decrypts data

(PECL crack >= 0.1) Performs an obscure check with the given password

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

(PHP 7) Generates cryptographically secure pseudo-random bytes

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

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Alias of

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Exports a certificate to file