248 lines
6.4 KiB
HTML
248 lines
6.4 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>Generate Psuedorandom Numbers (Qc3GenPRNs) 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>Generate Pseudorandom Numbers (QC3GENRN, Qc3GenPRNs) 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%">PRN data</td>
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<td align="left" valign="top" width="20%">Output</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">PRN 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">PRN type</td>
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<td align="left" valign="top">Input</td>
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<td align="left" valign="top">Char(1)</td>
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</tr>
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<tr>
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<td align="center" valign="top">4</td>
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<td align="left" valign="top">PRN Parity</td>
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<td align="left" valign="top">Input</td>
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<td align="left" valign="top">Char(1)</td>
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</tr>
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<tr>
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<td align="center" valign="top">5</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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<p>The Generate Pseudorandom Numbers (OPM, QC3GENRN; ILE, Qc3GenPRNs) API generates a
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pseudorandom binary stream.</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. Cryptographically-secure pseudorandom
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numbers rely on good seed. The FIPS 186-1 key and seed values are obtained from
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the system seed digest. The server automatically generates seed using data
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collected from system information or by using the random number generator
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function on a 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 the Add Seed for PRNG
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(Qc3AddPRNGSeed) API to add your own random seed to the system seed digest.
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This should be done as soon as possible any time the Licensed Internal Code is
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installed.</p>
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<br>
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<h3>Authorities and Locks</h3>
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<p>None.</p>
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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>PRN data</strong></dt>
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<dd>OUTPUT; CHAR(*)
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<p>The generated pseudorandom binary stream.</p>
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</dd>
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<dt><strong>PRN data length</strong></dt>
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<dd>INPUT; BINARY(4)
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<p>The number of pseudorandom number bytes to return in the PRN data parameter.
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If 0 is specified, no pseudorandom numbers are returned.</p>
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</dd>
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<dt><strong>PRN type</strong></dt>
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<dd>INPUT; CHAR(1)
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<p>The API can generate a real pseudorandom binary stream or a test binary
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stream.</p>
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<p>The FIPS 186-1 algorithm obtains the inital key and seed values from the
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system seed digest when generating a real pseudorandom binary stream. When
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generating a test binary stream, the algorithm uses preset values for the key
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and seed. Valid values are:</p>
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<table width="100%">
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<tr>
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<td align="left" valign="top" width="5%"><em>0</em></td>
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<td align="left" valign="top" width="95%">Generate real pseudorandom
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numbers.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>1</em></td>
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<td align="left" valign="top">Generate test pseudorandom numbers.</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>PRN Parity</strong></dt>
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<dd>INPUT; CHAR(1)
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<p>The API sets each byte of the pseudorandom number binary stream to the
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specified parity by altering the low order bit in each byte as necessary. Valid
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values are:</p>
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<table width="100%">
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<tr>
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<td align="left" valign="top" width="5%"><em>0</em></td>
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<td align="left" valign="top" width="95%">Do not set parity.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>1</em></td>
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<td align="left" valign="top">Set each byte to odd parity.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>2</em></td>
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<td align="left" valign="top">Set each byte to even parity.</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>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%">
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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">CPF3C19 E</td>
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<td width="85%" valign="top">Error occurred with receiver variable
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specified.</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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<tr>
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<td valign="top">CPFBAF1 E</td>
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<td valign="top">PRN type not valid.</td>
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</tr>
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<tr>
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<td valign="top">CPFBAF2 E</td>
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<td valign="top">Parity not valid.</td>
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</tr>
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<tr>
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<td valign="top">CPFBAF3 E</td>
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<td valign="top">The system seed digest is not ready.</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">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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