(PHP 4 >= 4.0.6, PHP 5, PHP 7) Encrypts data with public key
(PHP 5 >= 5.3.0, PHP 7) Encrypts data string
(PHP 4 >= 4.2.0, PHP 5, PHP 7) Generates a new private key
(PHP 4 >= 4.2.0, PHP 5, PHP 7) Exports a certificate to file
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