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✏️ Editing: X509_verify_cert.3

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.\" ========================================================================
.\"
.IX Title "X509_VERIFY_CERT 3"
.TH X509_VERIFY_CERT 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
X509_verify_cert \- discover and verify X509 certificate chain
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509.h>
\&
\& int X509_verify_cert(X509_STORE_CTX *ctx);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fBX509_verify_cert()\fR function attempts to discover and validate a
certificate chain based on parameters in \fBctx\fR. A complete description of
the process is contained in the \fBverify\fR\|(1) manual page.
.SH "RETURN VALUES"
.IX Header "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.
.PP
If the function fails additional error information can be obtained by
examining \fBctx\fR using, for example \fBX509_STORE_CTX_get_error()\fR.
.SH "NOTES"
.IX Header "NOTES"
Applications rarely call this function directly but it is used by
OpenSSL internally for certificate validation, in both the S/MIME and
\&\s-1SSL/TLS\s0 code.
.PP
A negative return value from \fBX509_verify_cert()\fR can occur if it is invoked
incorrectly, such as with no certificate set in \fBctx\fR, or when it is called
twice in succession without reinitialising \fBctx\fR 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.
.SH "BUGS"
.IX Header "BUGS"
This function uses the header \fBx509.h\fR as opposed to most chain verification
functions which use \fBx509_vfy.h\fR.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBX509_STORE_CTX_get_error\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2009\-2016 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

MR SKB