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

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

(PHP 4 >= 4.0.2, PHP 5, PHP 7) Gets an array of all supported modes

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

(PHP 4 >= 4.0.2, PHP 5, PHP 7) This function checks whether the specified algorithm is a block algorithm

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

(PHP 5 >= 5.1.2, PHP 7, PECL hash >= 1.1) Generate a hash value (message digest)

(PHP 5 >= 5.1.2, PHP 7, PECL hash >= 1.1) Pump data into an active hashing context from an open stream

(PHP 4 >= 4.0.2, PHP 5, PHP 7) This function encrypts data

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