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.\" $OpenBSD: X509_verify_cert.3,v 1.5 2017/01/03 06:29:04 beck Exp $
.\" OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
.\"
.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
.\" Copyright (c) 2009, 2015 The OpenSSL Project. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
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.\" notice, this list of conditions and the following disclaimer in
.\" the documentation and/or other materials provided with the
.\" distribution.
.\"
.\" 3. All advertising materials mentioning features or use of this
.\" software must display the following acknowledgment:
.\" "This product includes software developed by the OpenSSL Project
.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
.\"
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.\" endorse or promote products derived from this software without
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.\" openssl-core@openssl.org.
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.\" 6. Redistributions of any form whatsoever must retain the following
.\" acknowledgment:
.\" "This product includes software developed by the OpenSSL Project
.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.Dd $Mdocdate: January 3 2017 $
.Dt X509_VERIFY_CERT 3
.Os
.Sh NAME
.Nm X509_verify_cert
.Nd discover and verify X509 certificate chain
.Sh SYNOPSIS
.In openssl/x509.h
.Ft int
.Fo X509_verify_cert
.Fa "X509_STORE_CTX *ctx"
.Fc
.Sh DESCRIPTION
The
.Fn X509_verify_cert
function attempts to discover and validate a certificate chain based on
parameters in
.Fa ctx .
.Pp
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.
.Sh RETURN VALUES
If a complete chain can be built and validated this function returns 1,
otherwise it returns a value <= 0 indicating failure.
.Pp
Additional error information can be obtained by examining
.Fa ctx ,
using
.Xr X509_STORE_CTX_get_error 3 .
.Sh SEE ALSO
.Xr openssl 1 ,
.Xr X509_STORE_CTX_get_error 3
.Sh HISTORY
.Fn X509_verify_cert
is available in all versions of SSLeay and OpenSSL.
.Sh BUGS
This function uses the header
.In openssl/x509.h
as opposed to most chain verification functions which use
.In openssl/x509_vfy.h .
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