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7<TITLE>SVC_SHA1Init</TITLE>
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11<H1 align="left">SVC_SHA1Init <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_SHA1Init( SVCSHA1Context* context );</CODE></PRE>
17<P><CODE>typedef struct SVCSHA1Context<BR> {<BR>
18    u32 h0,h1,h2,h3,h4;<BR>
19    u32 Nl,Nh;<BR>
20    u32 data[16];<BR>
21    int num;<BR>
22    void (*sha_block)(struct SVCSHA1Context *c, const u8 *W, int num);<BR> }<BR> SVCSHA1Context;</CODE></P>
23
24</DL>
25
26<H2>Arguments</H2>
27<TABLE border="1">
28  <TBODY>
29    <TR>
30      <TD><B><I>context</I></B></TD>
31      <TD>Pointer to the context structure to initialize. This structure is used for SHA-1 generation.</TD>
32    </TR>
33  </TBODY>
34</TABLE>
35<H2>Return Values</H2>
36<P>None.</P>
37<H2>Description</H2>
38<P>Initializes the structure to use when calculating SHA-1. Make sure this function is called before using the <CODE><A href="SVC_SHA1Update.html">SVC_SHA1Update</A></CODE> or <CODE><A href="SVC_SHA1GetHash.html">SVC_SHA1GetHash</A></CODE> functions.</P>
39<P><B><I>context</I></B> is the context structure to initialize for SHA-1 generation. You can reapply this function to a context structure that is already initialized. In this case, it will return the context structure to its initial state.</P>
40<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>
41<H2>See Also</H2>
42<P><CODE><A href="SVC_SHA1Update.html">SVC_SHA1Update</A></CODE>, <CODE><A href="SVC_SHA1GetHash.html">SVC_SHA1GetHash</A></CODE></P>
43<H2>Revision History</H2>
44<P>2007/10/19 Initial version.</P>
45<hr><p>CONFIDENTIAL</p></body>
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