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

(PHP 5 >= 5.5.0, PHP 7) Checks if the given hash matches the given options

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

(PHP 5 >= 5.1.2, PHP 7, PECL hash >= 1.1) Generate a keyed hash value using the HMAC method and the contents

(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) Generates a CSR

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Generates a key

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

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