(PHP 4 >= 4.0.4, PHP 5, PHP 7) Seal (encrypt) data

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

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

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

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

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

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Free certificate resource

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

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

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