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

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Return openSSL error message

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

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

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

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Checks if a private key corresponds to a certificate

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

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

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Free key resource

(PHP 5 >= 5.6.0, PHP 7) Exports a valid PEM formatted public key signed public key and challenge