278 lines
6.5 KiB
HTML
278 lines
6.5 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>gss_unwrap()--Unwrap a Message</title>
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<!-- Begin Header Records ========================================== -->
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- Change History: -->
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<!-- Edited by Kersten Jan 02 -->
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<!-- Created by Kent Hofer for V5R1 -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<!-- End Header Records -->
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<!--Java sync-link-->
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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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</script>
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<a name="top_of_page"></a>
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<h2>gss_unwrap()--Unwrap a Message</h2>
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<div class="box" style="width: 60%;">
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<br>
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Syntax
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<pre>
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#include <gssapi.h>
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OM_uint32 gss_unwrap (
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OM_uint32 * <em>minor_status</em>,
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gss_ctx_id_t <em>context_handle</em>,
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gss_buffer_t <em>input_message</em>,
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gss_buffer_t <em>output_message</em>,
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int * <em>conf_state</em>,
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gss_qop_t * <em>qop_state</em>);
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</pre>
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Service Program Name: QSYS/QKRBGSS<br>
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<!-- iddvc RMBR -->
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<br>
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Default public authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: Yes<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <strong>gss_unwrap()</strong> function unwraps a message sealed by the
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<strong>gss_wrap()</strong> routine and verifies the embedded signature. The
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<em>conf_state</em> return parameter indicates whether or not the message has
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been encrypted.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>minor_status</strong> (Output)</dt>
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<dd>A status code from the security mechanism.<br>
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<br>
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</dd>
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<dt><strong>context_handle</strong> (Input)</dt>
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<dd>The context in which the message arrived.<br>
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<br>
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</dd>
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<dt><strong>input_message</strong> (Input)</dt>
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<dd>The sealed message token generated by the <strong>gss_wrap()</strong>
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routine.<br>
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<br>
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</dd>
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<dt><strong>output_message</strong> (Output)</dt>
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<dd>The unsealed message.<br>
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<br>
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</dd>
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<dt><strong>conf_state</strong> (Output)</dt>
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<dd>The level of confidentiality that was applied to the message. Specify
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<strong>NULL</strong> for this parameter if the confidentiality state is not
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needed. The return value is set as follows:<br>
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<br>
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<table cellpadding="5">
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<!-- cols="15 85" -->
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<tr>
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<td align="left" valign="top"><em>TRUE</em></td>
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<td align="left" valign="top">Both confidentiality and integrity services were
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applied.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>FALSE</em></td>
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<td align="left" valign="top">Only integrity services were applied.</td>
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</tr>
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</table>
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<br>
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</dd>
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<dt><strong>qop_state</strong> (Output)</dt>
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<dd>The quality of protection that was applied to the message. Specify
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<strong>NULL</strong> for this parameter if the quality of protection is not
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needed.
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<p>The Kerberos security mechanism supports three quality of protection levels
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as follows (in decreasing order or speed):</p>
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<table cellpadding="5">
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<!-- cols="40 60" -->
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<tr>
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<td align="left" valign="top"><em>GSS_KRB5_INTEG_C_QOP_MD5</em></td>
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<td align="left" valign="top">Truncated MD5</td>
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</tr>
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<tr>
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<td align="left" valign="top" nowrap><em>GSS_KRB5_INTEG_C_QOP_DES_MD5</em></td>
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<td align="left" valign="top">DES_MAC of an MD5 hash</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>GSS_KRB5_INTEG_C_QOP_DES_MAC</em></td>
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<td align="left" valign="top">Normal DES_MAC algorithm</td>
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</tr>
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</table>
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</dd>
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</dl>
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<br>
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<h3>Return Value</h3>
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<p>The return value is one of the following status codes:</p>
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<dl>
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<dt><strong>GSS_S_BAD_SIG</strong></dt>
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<dd>The input token contains an incorrect signature.<br>
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<br>
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</dd>
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<dt><strong>GSS_S_COMPLETE</strong></dt>
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<dd>The routine completed successfully.<br>
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<br>
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</dd>
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<dt><strong>GSS_S_CONTEXT_EXPIRED</strong></dt>
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<dd>The context identifier provided by the caller has expired.<br>
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<br>
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</dd>
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<dt><strong>GSS_S_CREDENTIALS_EXPIRED</strong></dt>
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<dd>Credentials are no longer valid.<br>
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<br>
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</dd>
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<dt><strong>GSS_S_DEFECTIVE_TOKEN</strong></dt>
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<dd>Consistency checks performed on the input token failed.<br>
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<br>
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</dd>
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<dt><strong>GSS_S_DUPLICATE_TOKEN</strong></dt>
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<dd>The token is a duplicate of a token that has already been processed.<br>
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<br>
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</dd>
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<dt><strong>GSS_S_FAILURE</strong></dt>
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<dd>The routine failed for reasons that are not defined at the GSS level. The
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<em>minor_status</em> return parameter contains a mechanism-dependent error
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code describing the reason for the failure.<br>
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<br>
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</dd>
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<dt><strong>GSS_S_GAP_TOKEN</strong></dt>
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<dd>One or more predecessor tokens have not been processed.<br>
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<br>
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</dd>
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<dt><strong>GSS_S_NO_CONTEXT</strong></dt>
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<dd>The context identifier provided by the caller does not refer to a valid
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security context.<br>
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<br>
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</dd>
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<dt><strong>GSS_S_OLD_TOKEN</strong></dt>
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<dd>The token is too old to be checked for duplication against previous tokens.
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This is a fatal error during context establishment.<br>
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<br>
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</dd>
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<dt><strong>GSS_S_UNSEQ_TOKEN</strong></dt>
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<dd>A later token has already been processed.</dd>
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</dl>
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<br>
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<h3>Authorities</h3>
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<table border width="80%">
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<tr>
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<th align="left" valign="bottom">Object Referred to</th>
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<th align="center" valign="bottom">Data Authority Required</th>
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</tr>
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<tr>
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<td align="left" valign="top">Each directory in the path name preceding the
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configuration file</td>
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<td align="center" valign="top">*X</td>
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</tr>
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<tr>
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<td align="left" valign="top">Configuration file</td>
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<td align="center" valign="top">*R</td>
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</tr>
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</table>
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<br>
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<br>
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<h3>Error Messages</h3>
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<table width="100%" cellpadding="5">
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<!-- cols="15 85" -->
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<tr>
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<th align="left" valign="top">Message ID</th>
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<th align="left" valign="top">Error Message Text</th>
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</tr>
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<tr>
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<td width="15%" valign="top">CPE3418 E</td>
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<td width="85%" valign="top">Possible APAR condition or hardware failure.</td>
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</tr>
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</table>
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<br>
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<hr>
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API introduced: V5R1
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
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"sec.htm">Security APIs</a> <br>
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<a href="unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by
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category</a> </td>
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</tr>
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</table>
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</center>
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</body>
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</html>
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