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13<h1 align="left">MATHSHA256Context<img src="../../image/NTR.gif"align="middle"><img src="../../image/TWL.gif" align="middle"></H1>
14<H2>Syntax</H2>
15
16<dl>
17  <dd>
18<PRE>
19<CODE>#include &lt;nitro/math/dgt.h&gt;<BR>
20struct MATHSHA256Context
21{
22    u32     h[8];
23    u32 Nl,Nh;
24    u8 data[MATHSHA256_CBLOCK];
25    int num;
26};
27</CODE></PRE>
28  </dd>
29</dl>
30<H2>Elements</H2>
31<P>Do not access the elements of this structure directly.</P>
32<H2>Description</H2>
33<P>This is the context structure used in calculating SHA-256. Its size is 108 bytes. Initialize it using the <CODE><A href="MATH_SHA256Init.html">MATH_SHA256Init</A></CODE> function, provide the input data with the <CODE><A href="MATH_SHA256Update.html">MATH_SHA256Update</A></CODE> function, and get the message digest value with the <CODE><A href="MATH_SHA256GetHash.html">MATH_SHA256GetHash</A></CODE> function. SHA-256 is an algorithm to find the message digest value. For details, refer to the Federal Information Processing Standard, FIPS PUB 180-2.
34</P>
35
36<h2>See Also</h2>
37<P><CODE><A href="MATH_SHA256Init.html">MATH_SHA256Init</A>, <A href="MATH_SHA256Update.html">MATH_SHA256Update</A>, <A href="MATH_SHA256GetHash.html">MATH_SHA256GetHash</A></CODE></P>
38<H2>Revision History</H2>
39<P>
402008/05/23 Initial version.
41</P>
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