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

(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) Exports a certificate as a string

(PHP 5 >= 5.2.0, PHP 7) Returns the subject of a CERT

(PHP 5 >= 5.2.0, PHP 7) Returns the public key of a CERT

(PHP 5 >= PHP 5.3.3, PHP 7) Gets the cipher iv length

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Decrypts an S/MIME encrypted message

(PHP 5 >= 5.3.11, PHP 7) Computes shared secret for public value of remote DH key and local DH key

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

(PHP 5 >= 5.5.0, PHP 7) Generates a PKCS5 v2 PBKDF2 string, defaults to SHA-1