(PHP 4 >= 4.0.2, PHP 5, PHP 7) This function checks whether the specified algorithm is a block algorithm

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Extract public key from certificate and prepare it for use

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Gets an exportable representation of a key into a string

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Generate signature

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Verify signature

(PHP 5 >= 5.6.0, PHP 7) Retrieve the available certificate locations

(PHP 5 >= 5.6.0, PHP 7) Exports the challenge assoicated with a signed public key and challenge

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

(PHP 4 >= 4.0.2, PHP 5, PHP 7) This function runs a self test on the specified module

(PHP 5 >= 5.1.2, PHP 7, PECL hash >= 1.1) Pump data into an active hashing context