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

(PHP 4 >= 4.0.2, PHP 5, PHP 7) Returns an array with the supported keysizes of the opened algorithm

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

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

(PHP 4, PHP 5, PHP 7) Gets the highest available hash ID

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Exports a certificate as a string

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

(PHP 4, PHP 5) Deprecated: Encrypts/decrypts data in ECB mode

(PHP 4 >= 4.0.2, PHP 5, PHP 7) Returns the maximum supported keysize of the opened mode

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