/*====================================================================* * * 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 HPAVKeyNMK (uint8_t NMK [], const char * string); * * HPAVKey.h * * compute the HomePlugAV compliant Network Membership Key (NMK) * for a NUL terminated string; return the key in buffer NMK []; * the key will be HPAVKEY_NMK_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 * *--------------------------------------------------------------------*/ #ifndef HPAVKEYNMK_SOURCE #define HPAVKEYNMK_SOURCE #include #include "../key/HPAVKey.h" #include "../key/SHA256.h" void HPAVKeyNMK (uint8_t NMK [], const char * string) { struct sha256 sha256; uint8_t digest [SHA256_DIGEST_LENGTH]; const uint8_t secret [] = { 0x08, 0x85, 0x6D, 0xAF, 0x7C, 0xF5, 0x81, 0x86 }; unsigned rehash = 999; SHA256Reset (&sha256); SHA256Write (&sha256, string, strlen (string)); SHA256Write (&sha256, secret, sizeof (secret)); SHA256Fetch (&sha256, digest); while (rehash--) { SHA256Reset (&sha256); SHA256Write (&sha256, digest, sizeof (digest)); SHA256Fetch (&sha256, digest); } memcpy (NMK, digest, HPAVKEY_NMK_LEN); return; } #endif