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X509_check_private_key(3)           OpenSSL          X509_check_private_key(3)

       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

       libcrypto, -lcrypto

        #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);

       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.

       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).

       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.


       Copyright 2017-2018 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

1.1.1                             2018-09-17         X509_check_private_key(3)