Updated: 2022/Sep/29

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X509_check_private_key(3)           OpenSSL          X509_check_private_key(3)



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

LIBRARY
       libcrypto, -lcrypto

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>.



3.0.12                            2023-05-07         X509_check_private_key(3)