1X509_CHECK_PRIVATE_KEY(3)           OpenSSL          X509_CHECK_PRIVATE_KEY(3)
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NAME

6       X509_check_private_key, X509_REQ_check_private_key - check the
7       consistency of a private key with the public key in an X509 certificate
8       or certificate request
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SYNOPSIS

11        #include <openssl/x509.h>
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13        int X509_check_private_key(X509 *x, EVP_PKEY *k);
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15        int X509_REQ_check_private_key(X509_REQ *x, EVP_PKEY *k);
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DESCRIPTION

18       X509_check_private_key() function checks the consistency of private key
19       k with the public key in x.
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21       X509_REQ_check_private_key() is equivalent to X509_check_private_key()
22       except that x represents a certificate request of structure X509_REQ.
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RETURN VALUES

25       X509_check_private_key() and X509_REQ_check_private_key() return 1 if
26       the keys match each other, and 0 if not.
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28       If the key is invalid or an error occurred, the reason code can be
29       obtained using ERR_get_error(3).
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BUGS

32       The check_private_key functions don't check if k itself is indeed a
33       private key or not. It merely compares the public materials (e.g.
34       exponent and modulus of an RSA key) and/or key parameters (e.g. EC
35       params of an EC key) of a key pair. So if you pass a public key to
36       these functions in k, it will return success.
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SEE ALSO

39       ERR_get_error(3)
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42       Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
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44       Licensed under the OpenSSL license (the "License").  You may not use
45       this file except in compliance with the License.  You can obtain a copy
46       in the file LICENSE in the source distribution or at
47       <https://www.openssl.org/source/license.html>.
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511.1.1q                            2023-02-06         X509_CHECK_PRIVATE_KEY(3)
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