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

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

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

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Sign a CSR with another certificate (or itself) and generate a certificate

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

(PHP 5 >= 5.6.0, PHP 7) Generate a new signed public key and challenge

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

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