1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
2<HTML>
3<HEAD>
4<META http-equiv="Content-Type" content="text/html; charset=windows-1252">
5<META name="GENERATOR" content="IBM WebSphere Studio Homepage Builder Version 7.0.0.0 for Windows">
6<META http-equiv="Content-Style-Type" content="text/css">
7<TITLE>SVC_SHA1GetHash</TITLE>
8<LINK rel="stylesheet" href="../css/nitro.css" type="text/css">
9</HEAD>
10<BODY>
11<H1 align="left">SVC_SHA1GetHash <IMG src="../image/BPT.gif" align="middle"><IMG src="../image/TWL.gif" align="middle"></H1>
12<H2>Syntax</H2>
13<DL>
14  <DD>
15<PRE><CODE>#include &lt;twl/os/common/systemCall.h&gt;</CODE></PRE>
16  <PRE><CODE>void SVC_SHA1GetHash( <A href="SVC_SHA1Init.html">SVCSHA1Context</A> *context,
17void* md );</CODE></PRE>
18</DL>
19<H2>Arguments</H2>
20<TABLE border="1">
21  <TBODY>
22    <TR>
23<TD><SPAN class="argument">context</SPAN></TD>
24<TD>Pointer to the context structure used for SHA-1 generation.</TD>
25    </TR>
26    <TR>
27<TD><SPAN class="argument">md</SPAN></TD>
28<TD>Pointer to the memory location that holds the message digest value.</TD>
29    </TR>
30  </TBODY>
31</TABLE>
32<H2>Return Values</H2>
33<P>None.</P>
34<H2>Description</H2>
35<P>Gets the digest value using SHA-1.</P>
36<P>Use the <A href="SVC_SHA1Init.html"><CODE>SVC_SHA1Init</CODE></A> function to initialize the <SPAN class="argument">context</SPAN> argument and then use the <A href="SVC_SHA1Update.html"><CODE>SVC_SHA1Update</CODE></A> function to provide the input data.</P>
37<P>The length of the generated message digest value is 160 bits, or <CODE>SVC_SHA1_DIGEST_SIZE</CODE> (= 20) bytes. Use the <SPAN class="argument">md</SPAN> argument to pass an area that can store a value of this size.</P>
38<P>This function rewrites <SPAN class="argument">context</SPAN> internally, so you cannot continue to use the same context with the <A href="SVC_SHA1Update.html"><CODE>SVC_SHA1Update</CODE></A> function.</P>
39<P>SHA-1 is an algorithm to find the message digest value. For details, see RFC (Request For Comments) 3174, which is published by IETF (the Internet Engineering Task Force).</P>
40<H2>See Also</H2>
41<P><A href="SVC_SHA1Init.html"><CODE>SVC_SHA1Init</CODE></A><BR> <A href="SVC_SHA1Update.html"><CODE>SVC_SHA1Update</CODE></A></P>
42<H2>Revision History</H2>
43<P>2007/10/22 Changed the order of the arguments.<BR> 2007/10/19 Initial version.</P>
44<hr><p>CONFIDENTIAL</p></body>
45</HTML>