SoftwareDesign
/
csu3_am335x


			
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130
							<?xml version='1.0' encoding='iso-8859-1'?>
<!doctype html public '-//W3C//DTD XHTML 1.0 Strict//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd'>
<html xmlns='http://www.w3c.org/1999/xhtml' lang='en-us'>
	<head>
		<title>
			HPAVKeyDAK.c
			</title>
		<meta http-equiv='content-type' content='text/html;iso-8859-1'/>
		<meta name='generator' content='motley-tools 1.9.4 13:40:33 Feb 18 2015'/>
		<meta name='author' content='cmaier@cmassoc.net'/>
		<meta name='robots' content='noindex,nofollow'/>
		<link href='toolkit.css' rel='stylesheet' type='text/css'/>
		</head>
	<body>
		<div class='headerlink'>
			[<a href='hpavkey.c.html' title=' hpavkey.c '>PREV</a>]
			[<a href='toolkit.html' title=' Index '>HOME</a>]
			[<a href='HPAVKeyNID.c.html' title=' HPAVKeyNID.c '>NEXT</a>]
			</div>
<pre>
/*====================================================================*
 *
 *   Copyright (c) 2013 Qualcomm Atheros, Inc.
 *
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or 
 *   without modification, are permitted (subject to the limitations 
 *   in the disclaimer below) provided that the following conditions 
 *   are met:
 *
 *   * Redistributions of source code must retain the above copyright 
 *     notice, this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above 
 *     copyright notice, this list of conditions and the following 
 *     disclaimer in the documentation and/or other materials 
 *     provided with the distribution.
 *
 *   * Neither the name of Qualcomm Atheros nor the names of 
 *     its contributors may be used to endorse or promote products 
 *     derived from this software without specific prior written 
 *     permission.
 *
 *   NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE 
 *   GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE 
 *   COPYRIGHT HOLDERS AND CONTRIBUTORS &quot;AS IS&quot; AND ANY EXPRESS OR 
 *   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
 *   PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 
 *   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
 *   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 *   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 *   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
 *   OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  
 *
 *--------------------------------------------------------------------*/

/*====================================================================*
 *
 *   void HPAVKeyDAK (uint8_t DAK [], const char * string);
 *
 *   HPAVKey.h
 *
 *   compute the HomePlugAV compliant Device Access Key (DAK) for a
 *   NUL terminated string; return the key in buffer DAK[]; the key
 *   will be HPAVKEY_DAK_LEN bytes as defined in HPAVKey.h;
 *
 *   seed the digest then salt the digest then rehash the digest 999
 *   times per HomePlug AV Specification;
 *
 *
 *   Contributor(s);
 *	Charles Maier &lt;cmaier@qca.qualcomm.com&gt;
 *
 *--------------------------------------------------------------------*/

#ifndef HPAVKEYDAK_SOURCE
#define HPAVKEYDAK_SOURCE

#include &lt;memory.h&gt;

#include &quot;../key/HPAVKey.h&quot;
#include &quot;../key/SHA256.h&quot;

void HPAVKeyDAK (uint8_t DAK [], const char * string)

{
	struct sha256 sha256;
	uint8_t digest [SHA256_DIGEST_LENGTH];
	const uint8_t secret [] =
	{
		0x08,
		0x85,
		0x6D,
		0xAF,
		0x7C,
		0xF5,
		0x81,
		0x85
	};
	unsigned rehash = 999;
	SHA256Reset (&amp;sha256);
	SHA256Write (&amp;sha256, string, strlen (string));
	SHA256Write (&amp;sha256, secret, sizeof (secret));
	SHA256Fetch (&amp;sha256, digest);
	while (rehash--)
	{
		SHA256Reset (&amp;sha256);
		SHA256Write (&amp;sha256, digest, sizeof (digest));
		SHA256Fetch (&amp;sha256, digest);
	}
	memcpy (DAK, digest, HPAVKEY_DAK_LEN);
	return;
}

#endif


</pre>
		<div class='footerlink'>
			[<a href='hpavkey.c.html' title=' hpavkey.c '>PREV</a>]
			[<a href='toolkit.html' title=' Index '>HOME</a>]
			[<a href='HPAVKeyNID.c.html' title=' HPAVKeyNID.c '>NEXT</a>]
			</div>
		</body>
	</html>