openssl_x509_check_private_key
    (PHP 4 >= 4.2.0, PHP 5)
openssl_x509_check_private_key -- Checks if a private key corresponds to a certificate
Description
bool 
openssl_x509_check_private_key ( mixed cert, mixed key)
     openssl_x509_check_private_key() returns TRUE if
     key is the private key that corresponds to
     cert, or FALSE otherwise.