Update files for OpenSSL-1.0.0f import.
[dragonfly.git] / secure / lib / libcrypto / man / X509_verify_cert.3
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124.\" ========================================================================
125.\"
126.IX Title "X509_verify_cert 3"
e3261593 127.TH X509_verify_cert 3 "2012-01-04" "1.0.0f" "OpenSSL"
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128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
132.SH "NAME"
133X509_verify_cert \- discover and verify X509 certificte chain
134.SH "SYNOPSIS"
135.IX Header "SYNOPSIS"
136.Vb 1
137\& #include <openssl/x509.h>
138\&
139\& int X509_verify_cert(X509_STORE_CTX *ctx);
140.Ve
141.SH "DESCRIPTION"
142.IX Header "DESCRIPTION"
143The \fIX509_verify_cert()\fR function attempts to discover and validate a
144certificate chain based on parameters in \fBctx\fR. A complete description of
145the process is contained in the \fIverify\fR\|(1) manual page.
146.SH "RETURN VALUES"
147.IX Header "RETURN VALUES"
148If a complete chain can be built and validated this function returns 1,
149otherwise it return zero, in exceptional circumstances it can also
150return a negative code.
151.PP
152If the function fails additional error information can be obtained by
153examining \fBctx\fR using, for example \fIX509_STORE_CTX_get_error()\fR.
154.SH "NOTES"
155.IX Header "NOTES"
156Applications rarely call this function directly but it is used by
157OpenSSL internally for certificate validation, in both the S/MIME and
158\&\s-1SSL/TLS\s0 code.
159.PP
160The negative return value from \fIX509_verify_cert()\fR can only occur if no
161certificate is set in \fBctx\fR (due to a programming error) or if a retry
162operation is requested during internal lookups (which never happens with
163standard lookup methods). It is however recommended that application check
164for <= 0 return value on error.
165.SH "BUGS"
166.IX Header "BUGS"
167This function uses the header \fBx509.h\fR as opposed to most chain verification
168functiosn which use \fBx509_vfy.h\fR.
169.SH "SEE ALSO"
170.IX Header "SEE ALSO"
171\&\fIX509_STORE_CTX_get_error\fR\|(3)
172.SH "HISTORY"
173.IX Header "HISTORY"
174\&\fIX509_verify_cert()\fR is available in all versions of SSLeay and OpenSSL.