X509_VERIFY_CERT
Section: OpenSSL (3)
Updated: 2021-03-26
Page Index
NAME
X509_verify_cert - discover and verify X509 certificate chain
SYNOPSIS
#include <openssl/x509.h>
int X509_verify_cert(X509_STORE_CTX *ctx);
DESCRIPTION
The
X509_verify_cert() function attempts to discover and validate a
certificate chain based on parameters in
ctx. A complete description of
the process is contained in the
verify(1) manual page.
RETURN VALUES
If a complete chain can be built and validated this function returns 1,
otherwise it return zero, in exceptional circumstances it can also
return a negative code.
If the function fails additional error information can be obtained by
examining ctx using, for example X509_STORE_CTX_get_error().
NOTES
Applications rarely call this function directly but it is used by
OpenSSL internally for certificate validation, in both the S/MIME and
SSL/TLS code.
A negative return value from X509_verify_cert() can occur if it is invoked
incorrectly, such as with no certificate set in ctx, or when it is called
twice in succession without reinitialising ctx for the second call.
A negative return value can also happen due to internal resource problems or if
a retry operation is requested during internal lookups (which never happens
with standard lookup methods).
Applications must check for <= 0 return value on error.
BUGS
This function uses the header
x509.h as opposed to most chain verification
functions which use
x509_vfy.h.
SEE ALSO
X509_STORE_CTX_get_error(3)
COPYRIGHT
Copyright 2009-2016 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>.