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13<h1 align="left">MATH_SHA256Update <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><CODE>#include &lt;nitro/math/dgt.h&gt;
19
20static inline void MATH_SHA256Update( <A href="MATHSHA256Context.html">MATHSHA256Context</A> *context, const void* input, u32 length );
21</CODE></PRE>
22  </dd>
23</dl><h2>Arguments</h2>
24
25<table border="1" width="100%">
26    <TR>
27      <TD width="176"><em><strong><font face="Courier New">context</font></strong></em></TD>
28      <TD width="670">Pointer to the context structure used for SHA-256 generation.</TD>
29    </TR>
30    <TR>
31      <TD width="176"><em><strong><font face="Courier New">input</font></strong></em></TD>
32      <TD width="670">Pointer to the input data.</TD>
33    </TR>
34    <TR>
35      <TD width="176"><em><strong><font face="Courier New">length</font></strong></em></TD>
36      <TD width="670">Size of the input data.</TD>
37    </TR>
38  </table>
39<h2>Return Values</h2>
40<p>None.</p>
41<H2>Description</H2>
42<P>This function updates the SHA-256 digest value based on the input data. You must initialize the <CODE>context</CODE> argument in advance using the <CODE><A href="MATH_SHA256Init.html">MATH_SHA256Init</A></CODE> function. Call this function as many times as needed, and then use the <CODE><A href="MATH_SHA256GetHash.html">MATH_SHA256GetHash</A></CODE> function to obtain the digest value. Any size and alignment position can be used for the input data. SHA-256 is an algorithm to find the message digest value. For details, refer to the Federal Information Processing Standard, FIPS PUB 180-2.
43</P>
44<h2>See Also</h2>
45<P><CODE><CODE><A href="MATH_SHA256Init.html">MATH_SHA256Init</A></CODE>, <A href="MATH_SHA256GetHash.html">MATH_SHA256GetHash</A></CODE></P>
46<H2>Revision History</H2>
47<P>
482008/05/23 Initial version.
49</P>
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