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

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

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

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

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Generates a CSR

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Frees a private key

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Verifies the signature of an S/MIME signed message

(PHP 5.6, PHP 7) Calculates the fingerprint, or digest, of a given X.509 certificate

(PHP 5 >= 5.2.0, PHP 7) Returns an array with the key details

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Get a private key