<div class="content" name="LSAPR_AUTH_INFORMATION" uuid="dfe16abb-4dfb-402d-bc54-84fcc9932fad"><p>The format of the LSAPR_AUTH_INFORMATION structure is as
follows.</p><table>
 <tbody><tr>
  <th><p><br/>0</p></th>
  <th><p><br/>1</p></th>
  <th><p><br/>2</p></th>
  <th><p><br/>3</p></th>
  <th><p><br/>4</p></th>
  <th><p><br/>5</p></th>
  <th><p><br/>6</p></th>
  <th><p><br/>7</p></th>
  <th><p><br/>8</p></th>
  <th><p><br/>9</p></th>
  <th><p>1<br/>0</p></th>
  <th><p><br/>1</p></th>
  <th><p><br/>2</p></th>
  <th><p><br/>3</p></th>
  <th><p><br/>4</p></th>
  <th><p><br/>5</p></th>
  <th><p><br/>6</p></th>
  <th><p><br/>7</p></th>
  <th><p><br/>8</p></th>
  <th><p><br/>9</p></th>
  <th><p>2<br/>0</p></th>
  <th><p><br/>1</p></th>
  <th><p><br/>2</p></th>
  <th><p><br/>3</p></th>
  <th><p><br/>4</p></th>
  <th><p><br/>5</p></th>
  <th><p><br/>6</p></th>
  <th><p><br/>7</p></th>
  <th><p><br/>8</p></th>
  <th><p><br/>9</p></th>
  <th><p>3<br/>0</p></th>
  <th><p><br/>1</p></th>
 </tr>
 <tr>
  <td colspan="32">LastUpdateTime</td>
 </tr>
 <tr>
  <td colspan="32">...</td>
 </tr>
 <tr>
  <td colspan="32">AuthType</td>
 </tr>
 <tr>
  <td colspan="32">AuthInfoLength</td>
 </tr>
 <tr>
  <td colspan="32">AuthInfo (variable)</td>
 </tr>
 <tr>
  <td colspan="32">...</td>
 </tr>
 <tr>
  <td colspan="32">Padding (variable)</td>
 </tr>
 <tr>
  <td colspan="32">...</td>
 </tr>
</tbody></table><p><b>LastUpdateTime (8 bytes): </b>This <span><a href="../ms-dtyp/e904b1ba-f774-4203-ba1b-66485165ab1a" data-linktype="relative-path">LARGE_INTEGER</a></span>
value represents the last time that the <span><a href="b645c125-a7da-4097-84a1-2fa7cea07714#gt_8e961bf0-95ba-4f58-9034-b67ccb27f317" data-linktype="relative-path">authentication</a></span>
information was set, in <span><a href="../ms-dtyp/2c57429b-fdd4-488f-b5fc-9e4cf020fcdf" data-linktype="relative-path">FILETIME</a></span>
format, as specified in <span><a href="../ms-dtyp/cca27429-5689-4a16-b2b4-9325d93e4ba2" data-linktype="relative-path">[MS-DTYP]</a></span>
section <span><a href="../ms-dtyp/ad05c0d3-1a4f-4799-80d1-ffc5299da73e" data-linktype="relative-path">2.3</a></span>.</p><p><b>AuthType (4 bytes): </b>This <span><a href="../ms-dtyp/32862b84-f6e6-40f9-85ca-c4faf985b822" data-linktype="relative-path">ULONG</a></span>
value dictates the type of <b>AuthInfo</b> that is being stored. There are four
values that are recognized by Windows.</p><dl>
<dd>
<table><thead>
  <tr>
   <th>
   <p>Possible Values</p>
   </th>
   <th>
   <p>Meaning</p>
   </th>
  </tr>
 </thead><tbody><tr>
  <td>TRUST_AUTH_TYPE_NONE 0</td>
  <td>AuthInfo byte field is invalid/not relevant.</td>
 </tr><tr>
  <td>TRUST_AUTH_TYPE_NT4OWF 1</td>
  <td>AuthInfo byte field contains an RC4 Key [RFC4757].</td>
 </tr><tr>
  <td>TRUST_AUTH_TYPE_CLEAR 2</td>
  <td>AuthInfo byte field contains a cleartext password, encoded as a Unicode string.</td>
 </tr><tr>
  <td>TRUST_AUTH_TYPE_VERSION 3</td>
  <td>AuthInfo byte field contains a version number, used by Netlogon for versioning interdomain trust secrets.</td>
 </tr></tbody></table>
</dd></dl><p><b>AuthInfoLength (4 bytes): </b>A ULONG count of
bytes in <b>AuthInfo</b>.</p><p><b>AuthInfo (variable): </b>A <span><a href="../ms-dtyp/d7edc080-e499-4219-a837-1bc40b64bb04" data-linktype="relative-path">BYTE</a></span>
field containing authentication data. Its size is [1...<b>AuthInfoLength</b>].</p><p><b>Padding (variable): </b>Some number of bytes used
to align the end of the LSAPR_AUTH_INFORMATION structure to a ULONG boundary.
This padding is not included in the <b>AuthInfoLength</b> and consists of
zeros.</p></div>