- NAME
- SYNOPSIS
- DESCRIPTION
- RETURN VALUE
- BUGS
- SEE ALSO
- COPYRIGHT

# 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 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. 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 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.