183 lines
5.3 KiB
HTML
183 lines
5.3 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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<!-- 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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<!-- Created by Beth Hagemeister for V5R1 -->
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<!-- Change history: -->
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<!-- 010629 File cleanup -->
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<!-- 030127 V5R3 hag: Add OPM entry -->
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<!-- Miscellaneous API -->
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<!-- end header records -->
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<title>Add Seed for Pseudorandom Number Generator (Qc3AddPRNGSeed) API</title>
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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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<a name="Top_Of_Page"></a>
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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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<h2>Add Seed for Pseudorandom Number Generator (QC3ADDSD, Qc3AddPRNGSeed) API</h2>
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<div class="box" style="width: 80%;">
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<br>
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Required Parameter Group:<br>
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<!-- iddvc RMBR -->
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<br>
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<table width="100%">
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<tr>
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<td align="center" valign="top" width="10%">1</td>
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<td align="left" valign="top" width="50%">Seed data</td>
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<td align="left" valign="top" width="20%">Input</td>
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<td align="left" valign="top" width="20%">Char(*)</td>
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</tr>
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<tr>
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<td align="center" valign="top">2</td>
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<td align="left" valign="top">Seed data length</td>
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<td align="left" valign="top">Input</td>
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<td align="left" valign="top">Binary(4)</td>
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</tr>
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<tr>
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<td align="center" valign="top">3</td>
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<td align="left" valign="top">Error Code</td>
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<td align="left" valign="top">I/O</td>
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<td align="left" valign="top">Char(*)</td>
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</tr>
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</table>
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<br>
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Service Program Name: QC3PRNG<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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<br>
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<p>The Add Seed for Pseudorandom Number Generator (OPM, QC3ADDSD; ILE, Qc3AddPRNGSeed) API allows
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the user to add seed into the server's pseudorandom number generator system
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seed digest.</p>
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<p>The pseudorandom number generator is composed of two parts: pseudorandom
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number generation and seed management. Pseudorandom number generation is
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performed using the FIPS 186-1 algorithm. (See the Generate Pseudorandom
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Numbers (Qc3GenPRNs) API.) Cryptographically-secure pseudorandom numbers rely
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on good seed. The FIPS 186-1 key and seed values are obtained from the system
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seed digest. The server automatically generates seed using data collected from
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system information or by using the random number generator function on a
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cryptographic coprocessor, such as a 4758, if one is available.
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System-generated seed can never be truly unpredictable. If a cryptographic
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coprocessor is not available, you can use this API to add your own random seed
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to the system seed digest. This should be done as soon as possible any time the
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Licensed Internal Code is installed.</p>
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<br>
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<h3>Authorities and Locks</h3>
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<p>All object (*ALLOBJ) special authority is needed to use this API.</p>
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<dl>
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<dt><em>User Profile Authority</em></dt>
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<dd>*ALLOBJ</dd>
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</dl>
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<br>
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<h3>Required Parameter Group</h3>
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<dl>
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<dt><strong>Seed data</strong></dt>
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<dd>INPUT; CHAR(*)
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<p>The input seed data for the system seed digest.</p>
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<p>It is important that the seed data be unpredictable and have as much entropy
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as possible. Entropy is the minimum number of bits needed to represent the
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information contained in some data. For seeding purposes, entropy is a measure
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of the amount of uncertainty or unpredictability of the seed. The system seed
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digest holds a maximum of 160 bits of entropy. You should add at least that
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much entropy to refresh the system seed digest totally. Possible sources of
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seed data are coin flipping, keystroke or mouse timings, or a noise source such
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as the one available on the 4758 Cryptographic Coprocessor.</p>
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</dd>
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<dt><strong>Seed data length</strong></dt>
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<dd>INPUT; BINARY(4)
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<p>The length of the seed data, in bytes. If this length is 0, no seed data is
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added.</p>
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</dd>
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<dt><strong>Error code</strong></dt>
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<dd>I/O; CHAR(*)
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<p>The structure in which to return error information. For the format of the
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structure, see <a href="../apiref/error.htm#hdrerrcod">Error Code Parameter</a>.</p>
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</dd>
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</dl>
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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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<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">CPF222E E</td>
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<td width="85%" valign="top">*ALLOBJ special authority is required.</td>
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</tr>
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<tr>
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<td valign="top">CPF3C17 E</td>
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<td valign="top">Error occurred with input data parameter.</td>
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</tr>
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<tr>
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<td valign="top">CPF3CF1 E</td>
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<td valign="top">Error code parameter not valid.</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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<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">Top</a> | <a href=
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"misc1.htm">Miscellaneous 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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