/usr/man/cat.3/X509_REQ_check_private_key.3
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
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>.
1.0.2t Last change: 2019-09-10 1
See also X509_check_private_key(3)
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