(PHP 4 >= 4.2.0, PHP 5, PHP 7) Generates a CSR
(PHP 4 >= 4.2.0, PHP 5, PHP 7) Checks if a private key corresponds to a certificate
(PHP 4 >= 4.0.6, PHP 5, PHP 7) Return openSSL error message
(PHP 5 >= 5.2.2, PHP 7) Exports a PKCS#12 Compatible Certificate Store File
(PHP 5 >= 5.6.0, PHP 7) Retrieve the available certificate locations
(PHP 4 >= 4.0.6, PHP 5, PHP 7) Verifies the signature of an S/MIME signed message
(PHP 4 >= 4.2.0, PHP 5, PHP 7) Exports a certificate as a string
(PHP 5 >= 5.2.0, PHP 7) Returns an array with the key details
(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
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