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HPAVKeyNID.c
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/*====================================================================*
*
* 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 "AS IS" 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 HPAVKeyNID (uint8_t NID [], const uint8_t NMK [], signed level);
*
* HPAVKey.h
*
* compute the HomePlugAV compliant Network Identification Key (NID)
* for a given Network Membership Key (NMK); return the key in buffer
* NID []; the key will be HPAVKEY_NID_LEN bytes as defined in
* HPAVKey.h;
*
* unlike the NMK, the NID is 54-bits and includes a 2-bit security
* level; See the HomePlug AV Specification for more info;
*
* hash the NMK then rehash the digest 4 times per HomePlug AV
* Specification; no salt is used;
*
*
* Contributor(s);
* Charles Maier <cmaier@qca.qualcomm.com>
*
*--------------------------------------------------------------------*/
#ifndef HPAVKEYNID_SOURCE
#define HPAVKEYNID_SOURCE
#include <memory.h>
#include "../key/HPAVKey.h"
#include "../key/SHA256.h"
void HPAVKeyNID (uint8_t NID [], const uint8_t NMK [], uint8_t level)
{
struct sha256 sha256;
uint8_t digest [SHA256_DIGEST_LENGTH];
unsigned rehash = 4;
SHA256Reset (&sha256);
SHA256Write (&sha256, NMK, HPAVKEY_NMK_LEN);
SHA256Fetch (&sha256, digest);
while (rehash--)
{
SHA256Reset (&sha256);
SHA256Write (&sha256, digest, sizeof (digest));
SHA256Fetch (&sha256, digest);
}
#if 1
level <<= 4;
digest [HPAVKEY_NID_LEN - 1] >>= 4;
digest [HPAVKEY_NID_LEN - 1] |= level;
#else
digest [HPAVKEY_NID_LEN - 1] &= ~0xC0;
digest [HPAVKEY_NID_LEN - 1] |= level << 6;
#endif
memcpy (NID, digest, HPAVKEY_NID_LEN);
return;
}
#endif
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