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X509_VERIFY_CERT(3)		    OpenSSL		   X509_VERIFY_CERT(3)

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>.

1.1.1a				  2018-11-20		   X509_VERIFY_CERT(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | NOTES | BUGS | SEE ALSO | COPYRIGHT

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