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diff --git a/secure/lib/libcrypto/man/SSL_CTX_set_cert_verify_callback.3 b/secure/lib/libcrypto/man/SSL_CTX_set_cert_verify_callback.3
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+.\"
+.IX Title "SSL_CTX_SET_CERT_VERIFY_CALLBACK 1"
+.TH SSL_CTX_SET_CERT_VERIFY_CALLBACK 1 "perl v5.6.1" "2002-01-27" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+SSL_CTX_set_cert_verify_callback \- set peer certificate verification procedure
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/ssl.h>
+.Ve
+.Vb 3
+\& void SSL_CTX_set_cert_verify_callback(SSL_CTX *ctx, int (*callback)(),
+\&                                       char *arg);
+\& int (*callback)();
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fISSL_CTX_set_cert_verify_callback()\fR sets the verification callback function for
+\&\fBctx\fR. \s-1SSL\s0 objects, that are created from \fBctx\fR inherit the setting valid at
+the time, SSL_new(3) is called. \fBarg\fR is currently ignored.
+.SH "NOTES"
+.IX Header "NOTES"
+Whenever a certificate is verified during a \s-1SSL/TLS\s0 handshake, a verification
+function is called. If the application does not explicitly specify a
+verification callback function, the built-in verification function is used.
+If a verification callback \fBcallback\fR is specified via
+\&\fISSL_CTX_set_cert_verify_callback()\fR, the supplied callback function is called
+instead. By setting \fBcallback\fR to \s-1NULL\s0, the default behaviour is restored.
+.PP
+When the verification must be performed, \fBcallback\fR will be called with
+the argument callback(X509_STORE_CTX *x509_store_ctx). The arguments \fBarg\fR
+that can be specified when setting \fBcallback\fR are currently ignored.
+.PP
+\&\fBcallback\fR should return 1 to indicate verification success and 0 to
+indicate verification failure. If \s-1SSL_VERIFY_PEER\s0 is set and \fBcallback\fR
+returns 0, the handshake will fail. As the verification procedure may
+allow to continue the connection in case of failure (by always returning 1)
+the verification result must be set in any case using the \fBerror\fR
+member of \fBx509_store_ctx\fR, so that the calling application will be informed
+about the detailed result of the verification procedure! 
+.PP
+Within \fBx509_store_ctx\fR, \fBcallback\fR has access to the \fBverify_callback\fR
+function set using SSL_CTX_set_verify(3).
+.SH "WARNINGS"
+.IX Header "WARNINGS"
+Do not mix the verification callback described in this function with the
+\&\fBverify_callback\fR function called during the verification process. The
+latter is set using the SSL_CTX_set_verify(3)
+family of functions.
+.PP
+Providing a complete verification procedure including certificate purpose
+settings etc is a complex task. The built-in procedure is quite powerful
+and in most cases it should be sufficient to modify its behaviour using
+the \fBverify_callback\fR function.
+.SH "BUGS"
+.IX Header "BUGS"
+It is possible to specify arguments to be passed to the verification callback.
+Currently they are however not passed but ignored.
+.PP
+The \fBcallback\fR function is not specified via a prototype, so that no
+type checking takes place.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fISSL_CTX_set_cert_verify_callback()\fR does not provide diagnostic information.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+ssl(3), SSL_CTX_set_verify(3),
+SSL_get_verify_result(3),
+SSL_CTX_load_verify_locations(3)