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

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

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Parse an X509 certificate and return the information as an array

(PHP 5 >= 5.3.0, PHP 7) Computes a digest

(PHP 5 >= 5.2.2, PHP 7) Exports a PKCS#12 Compatible Certificate Store File to variable.

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Verifies if a certificate can be used for a particular purpose

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

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Open sealed data

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

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Decrypts data with private key