=pod
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=head1 NAME
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X509_verify_cert - discover and verify X509 certificate chain
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=head1 SYNOPSIS
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#include <openssl/x509.h>
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int X509_verify_cert(X509_STORE_CTX *ctx);
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=head1 DESCRIPTION
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The X509_verify_cert() function attempts to discover and validate a
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certificate chain based on parameters in B<ctx>. A complete description of
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the process is contained in the L<verify(1)> manual page.
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=head1 RETURN VALUES
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If a complete chain can be built and validated this function returns 1,
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otherwise it return zero, in exceptional circumstances it can also
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return a negative code.
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If the function fails additional error information can be obtained by
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examining B<ctx> using, for example X509_STORE_CTX_get_error().
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=head1 NOTES
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Applications rarely call this function directly but it is used by
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OpenSSL internally for certificate validation, in both the S/MIME and
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SSL/TLS code.
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A negative return value from X509_verify_cert() can occur if it is invoked
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incorrectly, such as with no certificate set in B<ctx>, or when it is called
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twice in succession without reinitialising B<ctx> for the second call.
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A negative return value can also happen due to internal resource problems or if
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a retry operation is requested during internal lookups (which never happens
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with standard lookup methods).
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Applications must check for <= 0 return value on error.
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=head1 BUGS
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This function uses the header B<x509.h> as opposed to most chain verification
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functions which use B<x509_vfy.h>.
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=head1 SEE ALSO
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L<X509_STORE_CTX_get_error(3)>
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=head1 COPYRIGHT
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Copyright 2009-2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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