Checks if a private key corresponds to a certificate openssl_verify openssl_x509_checkpurpose OpenSSL Functions PHP Manual 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 ) Checks whether the given key is the private key that corresponds to cert . Parameters cert The certificate. key The private key. Return Values Returns TRUE if key is the private key that corresponds to cert , or FALSE otherwise. openssl_verify openssl_x509_checkpurpose OpenSSL Functions PHP Manual