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+ <div class="section" id="keytab-file-format">
+<span id="id1"></span><h1>Keytab file format<a class="headerlink" href="#keytab-file-format" title="Permalink to this headline">¶</a></h1>
+<p>There are two versions of the file format used by the FILE keytab
+type. The first byte of the file always has the value 5, and the
+value of the second byte contains the version number (1 or 2).
+Version 1 of the file format uses native byte order for integer
+representations. Version 2 always uses big-endian byte order.</p>
+<p>After the two-byte version indicator, the file contains a sequence of
+signed 32-bit record lengths followed by key records or holes. A
+positive record length indicates a valid key entry whose size is equal
+to or less than the record length. A negative length indicates a
+zero-filled hole whose size is the inverse of the length. A length of
+0 indicates the end of the file.</p>
+<div class="section" id="key-entry-format">
+<h2>Key entry format<a class="headerlink" href="#key-entry-format" title="Permalink to this headline">¶</a></h2>
+<p>A key entry may be smaller in size than the record length which
+precedes it, because it may have replaced a hole which is larger than
+the key entry. Key entries use the following informal grammar:</p>
+<div class="highlight-python"><div class="highlight"><pre>entry ::=
+ principal
+ timestamp (32 bits)
+ key version (8 bits)
+ enctype (16 bits)
+ key length (16 bits)
+ key contents
+ key version (32 bits) [in release 1.14 and later]
+
+principal ::=
+ count of components (16 bits) [includes realm in version 1]
+ realm (data)
+ component1 (data)
+ component2 (data)
+ ...
+ name type (32 bits) [omitted in version 1]
+
+data ::=
+ length (16 bits)
+ value (length bytes)
+</pre></div>
+</div>
+<p>The 32-bit key version overrides the 8-bit key version. To determine
+if it is present, the implementation must check that at least 4 bytes
+remain in the record after the other fields are read, and that the
+value of the 32-bit integer contained in those bytes is non-zero.</p>
+</div>
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+
+
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+ <h2>On this page</h2>
+ <ul>
+<li><a class="reference internal" href="#">Keytab file format</a><ul>
+<li><a class="reference internal" href="#key-entry-format">Key entry format</a></li>
+</ul>
+</li>
+</ul>
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+<li class="toctree-l2 current"><a class="current reference internal" href="">Keytab file format</a><ul class="simple">
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