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7<TITLE>SVC_HMACSHA1GetHash</TITLE>
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11<H1 align="left">SVC_HMACSHA1GetHash <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( <CODE><A href="SVC_HMACSHA1Init.html">SVCHMACSHA1Context</A></CODE> *context,
17                       void* md );</CODE></PRE>
18</DL>
19<H2>Arguments</H2>
20<TABLE border="1">
21  <TBODY>
22    <TR>
23      <TD><B><I>context</I></B></TD>
24      <TD>Pointer to the context structure for HMAC-SHA1 generation.</TD>
25    </TR>
26    <TR>
27      <TD><B><I>md</I></B></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 HMAC-SHA1 digest value.</P>
36<P>Use the <CODE><A href="SVC_HMACSHA1Init.html">SVC_HMACSHA1Init</A></CODE> function to initialize the <B><I>context</I></B> argument and then use the <CODE><A href="SVC_HMACSHA1Update.html">SVC_HMACSHA1Update</A></CODE> 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 <B><I>md </I></B> argument to pass an area that can store a value of this size.</P>
38<P>This function rewrites <CODE>context</CODE> internally, so you cannot continue to use the same context with the <CODE><A href="SVC_HMACSHA1Update.html">SVC_HMACSHA1Update</A></CODE> function.</P>
39
40<H2>See Also</H2>
41<P><CODE><A href="SVC_HMACSHA1Init.html">SVC_HMACSHA1Init</A></CODE>, <CODE><A href="SVC_HMACSHA1Update.html">SVC_HMACSHA1Update</A></CODE>, <CODE><A href="SVC_SHA1GetHash.html">SVC_SHA1GetHash</A></CODE></P>
42<H2>Revision History</H2>
43<P>2007/10/24 Initial version.</P>
44<hr><p>CONFIDENTIAL</p></body>
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