(PHP 5 >= 5.6.0, PHP 7) Verifies a signed public key and challenge
(PHP 4 >= 4.0.6, PHP 5, PHP 7) Encrypts data with public key
(PHP 4 >= 4.0.6, PHP 5, PHP 7) Parse an X.509 certificate and return a resource identifier for it
(PHP 4 >= 4.0.6, PHP 5, PHP 7) Free certificate resource
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