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<section id="krb5-mk-safe-format-a-krb-safe-message">
<h1>krb5_mk_safe - Format a KRB-SAFE message.<a class="headerlink" href="#krb5-mk-safe-format-a-krb-safe-message" title="Link to this heading">¶</a></h1>
<dl class="c function">
<dt class="sig sig-object c" id="c.krb5_mk_safe">
<a class="reference internal" href="../types/krb5_error_code.html#c.krb5_error_code" title="krb5_error_code"><span class="n"><span class="pre">krb5_error_code</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">krb5_mk_safe</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="../types/krb5_context.html#c.krb5_context" title="krb5_context"><span class="n"><span class="pre">krb5_context</span></span></a><span class="w"> </span><span class="n"><span class="pre">context</span></span>, <a class="reference internal" href="../types/krb5_auth_context.html#c.krb5_auth_context" title="krb5_auth_context"><span class="n"><span class="pre">krb5_auth_context</span></span></a><span class="w"> </span><span class="n"><span class="pre">auth_context</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><a class="reference internal" href="../types/krb5_data.html#c.krb5_data" title="krb5_data"><span class="n"><span class="pre">krb5_data</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">userdata</span></span>, <a class="reference internal" href="../types/krb5_data.html#c.krb5_data" title="krb5_data"><span class="n"><span class="pre">krb5_data</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">der_out</span></span>, <a class="reference internal" href="../types/krb5_replay_data.html#c.krb5_replay_data" title="krb5_replay_data"><span class="n"><span class="pre">krb5_replay_data</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">rdata_out</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.krb5_mk_safe" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="field-list">
<dt class="field-odd">param<span class="colon">:</span></dt>
<dd class="field-odd"><p><strong>[in]</strong> <strong>context</strong> - Library context</p>
<p><strong>[in]</strong> <strong>auth_context</strong> - Authentication context</p>
<p><strong>[in]</strong> <strong>userdata</strong> - User data in the message</p>
<p><strong>[out]</strong> <strong>der_out</strong> - Formatted <strong>KRB-SAFE</strong> buffer</p>
<p><strong>[out]</strong> <strong>rdata_out</strong> - Replay data. Specify NULL if not needed</p>
</dd>
</dl>
<dl class="field-list simple">
<dt class="field-odd">retval<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p>0 Success; otherwise - Kerberos error codes</p></li>
</ul>
</dd>
</dl>
<p>This function creates an integrity protected <strong>KRB-SAFE</strong> message using data supplied by the application.</p>
<p>Fields in <em>auth_context</em> specify the checksum type, the keyblock that can be used to seed the checksum, full addresses (host and port) for the sender and receiver, and KRB5_AUTH_CONTEXT flags.</p>
<p>The local address in <em>auth_context</em> must be set, and is used to form the sender address used in the KRB-SAFE message. The remote address is optional; if specified, it will be used to form the receiver address used in the message.</p>
<p>If the KRB5_AUTH_CONTEXT_DO_TIME flag is set in <em>auth_context</em> , a timestamp is included in the KRB-SAFE message, and an entry for the message is entered in an in-memory replay cache to detect if the message is reflected by an attacker. If KRB5_AUTH_CONTEXT_DO_TIME is not set, no replay cache is used. If KRB5_AUTH_CONTEXT_RET_TIME is set in <em>auth_context</em> , a timestamp is included in the KRB-SAFE message and is stored in <em>rdata_out</em> .</p>
<p>If either KRB5_AUTH_CONTEXT_DO_SEQUENCE or KRB5_AUTH_CONTEXT_RET_SEQUENCE is set, the <em>auth_context</em> local sequence number is included in the KRB-SAFE message and then incremented. If KRB5_AUTH_CONTEXT_RET_SEQUENCE is set, the sequence number used is stored in <em>rdata_out</em> .</p>
<p>Use krb5_free_data_contents() to free <em>der_out</em> when it is no longer needed.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The <em>rdata_out</em> argument is required if the KRB5_AUTH_CONTEXT_RET_TIME or KRB5_AUTH_CONTEXT_RET_SEQUENCE flag is set in <em>auth_context</em> .</p>
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