/usr/man/cat.3/X509_check_private_key.3.Z

NAME

       X509_check_private_key, X509_REQ_check_private_key - check the consis-
       tency 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 VALUE

       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. expo-
       nent 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 func-
       tions in k, it will return success.

SEE ALSO

       ERR_get_error(3)

COPYRIGHT

       Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (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>.

1.0.2t                            2019-09-10         X509_check_private_key(3)
See also X509_REQ_check_private_key(3)