NAME

       X509_check_private_key, X509_REQ_check_private_key - check the consistency of a private
       key with the public key in an X509 certificate or certificate request

SYNOPSIS

        #include <openssl/x509.h>

        int X509_check_private_key(X509 *x, EVP_PKEY *k);

        int X509_REQ_check_private_key(X509_REQ *x, EVP_PKEY *k);

DESCRIPTION

       X509_check_private_key() function checks the consistency of private key k with the public
       key in x.

       X509_REQ_check_private_key() is equivalent to X509_check_private_key() except that x
       represents a certificate request of structure X509_REQ.

RETURN VALUES

       X509_check_private_key() and X509_REQ_check_private_key() return 1 if the keys match each
       other, and 0 if not.

       If the key is invalid or an error occurred, the reason code can be obtained using
       ERR_get_error(3).

BUGS

       The check_private_key functions don't check if k itself is indeed a private key or not. It
       merely compares the public materials (e.g. exponent and modulus of an RSA key) and/or key
       parameters (e.g. EC params of an EC key) of a key pair. So if you pass a public key to
       these functions in k, it will return success.

SEE ALSO

       ERR_get_error(3)

COPYRIGHT

       Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use this file except
       in compliance with the License.  You can obtain a copy in the file LICENSE in the source
       distribution or at <https://www.openssl.org/source/license.html>.