(PHP 4 >= 4.0.6, PHP 5, PHP 7) Sign an S/MIME message
(PHP 5 >= 5.2.2, PHP 7) Parse a PKCS#12 Certificate Store into an array
(PHP 4 >= 4.2.0, PHP 5, PHP 7) Exports a certificate to file
(PHP 4 >= 4.0.6, PHP 5, PHP 7) Parse an X.509 certificate and return a resource identifier for it
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