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7<TITLE>SVC_HMACSHA1Update</TITLE>
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11<H1 align="left">SVC_HMACSHA1Update <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_HMACSHA1Update( <CODE><A href="SVC_HMACSHA1Init.html">SVCHMACSHA1Context</A></CODE> *context,
17                          const void* data,
18                          u32 len );</CODE></PRE>
19</DL>
20<H2>Arguments</H2>
21<TABLE border="1">
22  <TBODY>
23    <TR>
24      <TD><B><I>context</I></B></TD>
25      <TD>Pointer to the context structure for HMAC-SHA1 generation.</TD>
26    </TR>
27    <TR>
28      <TD><B><I>data</I></B></TD>
29      <TD>Pointer to the input data.</TD>
30    </TR>
31    <TR>
32      <TD><B><I>len</I></B></TD>
33      <TD>Size of the input data.</TD>
34    </TR>
35  </TBODY>
36</TABLE>
37<H2>Return Values</H2>
38<P>None.</P>
39<H2>Description</H2>
40<P>This function updates the HMAC-SHA1 digest value based on the input data.</P>
41<P><B><I>context</I></B> must be initialized beforehand with <CODE><A href="SVC_HMACSHA1Init.html">SVC_HMACSHA1Init()</A></CODE>.</P>
42<P>Call this function as many times as needed, and then use the <CODE><A href="SVC_HMACSHA1GetHash.html">SVC_HMACSHA1GetHash</A></CODE> function to obtain the digest value. Specify the input data using <B><I>data</I></B> and <B><I>len</I></B>. Any size and alignment position can be used.</P>
43
44<H2>See Also</H2>
45<P><CODE><A href="SVC_HMACSHA1Init.html">SVC_HMACSHA1Init</A></CODE>, <CODE><A href="SVC_HMACSHA1GetHash.html">SVC_HMACSHA1GetHash</A></CODE>, <CODE><A href="SVC_SHA1Update.html">SVC_SHA1Update</A></CODE></P>
46<H2>Revision History</H2>
47<P>2007/10/24 Initial version.</P>
48<hr><p>CONFIDENTIAL</p></body>
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