181 lines
6.1 KiB
C
181 lines
6.1 KiB
C
//
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// --------------------------------------------------------------------------
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// Gurux Ltd
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//
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//
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//
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// Filename: $HeadURL$
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//
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// Version: $Revision$,
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// $Date$
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// $Author$
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//
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// Copyright (c) Gurux Ltd
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//
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//---------------------------------------------------------------------------
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//
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// DESCRIPTION
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//
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// This file is a part of Gurux Device Framework.
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//
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// Gurux Device Framework is Open Source software; you can redistribute it
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// and/or modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; version 2 of the License.
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// Gurux Device Framework is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU General Public License for more details.
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//
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// This code is licensed under the GNU General Public License v2.
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// Full text may be retrieved at http://www.gnu.org/licenses/gpl-2.0.txt
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//---------------------------------------------------------------------------
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#include "gxignore.h"
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#ifndef DLMS_IGNORE_HIGH_SHA256
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#include <string.h>
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#include "gxsha256.h"
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const uint32_t sha256_k[64] =
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{ 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
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0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
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0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
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0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
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0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
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0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
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0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
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0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
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0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 };
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#define SHA2_SHFR(x, n) (x >> n)
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#define SHA2_ROTR(x, n) ((x >> n) | (x << ((sizeof(x) << 3) - n)))
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#define SHA2_ROTL(x, n) ((x << n) | (x >> ((sizeof(x) << 3) - n)))
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#define SHA2_CH(x, y, z) ((x & y) ^ (~x & z))
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#define SHA2_MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
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#define SHA256_F1(x) (SHA2_ROTR(x, 2) ^ SHA2_ROTR(x, 13) ^ SHA2_ROTR(x, 22))
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#define SHA256_F2(x) (SHA2_ROTR(x, 6) ^ SHA2_ROTR(x, 11) ^ SHA2_ROTR(x, 25))
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#define SHA256_F3(x) (SHA2_ROTR(x, 7) ^ SHA2_ROTR(x, 18) ^ SHA2_SHFR(x, 3))
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#define SHA256_F4(x) (SHA2_ROTR(x, 17) ^ SHA2_ROTR(x, 19) ^ SHA2_SHFR(x, 10))
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#define SHA2_UNPACK32(x, str) \
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{ \
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*((str) + 3) = (unsigned char) ((x) ); \
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*((str) + 2) = (unsigned char) ((x) >> 8); \
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*((str) + 1) = (unsigned char) ((x) >> 16); \
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*((str) + 0) = (unsigned char) ((x) >> 24); \
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}
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#define SHA2_PACK32(str, x) \
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{ \
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*(x) = ((uint32_t) *((str) + 3) ) \
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| ((uint32_t) *((str) + 2) << 8) \
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| ((uint32_t) *((str) + 1) << 16) \
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| ((uint32_t) *((str) + 0) << 24); \
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}
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void gxsha256_transform(uint32_t *h, const unsigned char *message, unsigned int block_nb)
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{
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uint32_t w[64];
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uint32_t wv[8];
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uint32_t t1, t2;
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const unsigned char *sub_block;
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unsigned int i;
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int j;
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for (i = 0; i < block_nb; i++)
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{
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sub_block = message + (i << 6);
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for (j = 0; j < 16; j++)
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{
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SHA2_PACK32(&sub_block[j << 2], &w[j]);
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}
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for (j = 16; j < 64; j++)
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{
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w[j] = SHA256_F4(w[j - 2]) + w[j - 7] + SHA256_F3(w[j - 15]) + w[j - 16];
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}
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for (j = 0; j < 8; j++)
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{
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wv[j] = h[j];
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}
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for (j = 0; j < 64; j++) {
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t1 = wv[7] + SHA256_F2(wv[4]) + SHA2_CH(wv[4], wv[5], wv[6])
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+ sha256_k[j] + w[j];
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t2 = SHA256_F1(wv[0]) + SHA2_MAJ(wv[0], wv[1], wv[2]);
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wv[7] = wv[6];
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wv[6] = wv[5];
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wv[5] = wv[4];
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wv[4] = wv[3] + t1;
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wv[3] = wv[2];
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wv[2] = wv[1];
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wv[1] = wv[0];
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wv[0] = t1 + t2;
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}
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for (j = 0; j < 8; j++)
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{
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h[j] += wv[j];
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}
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}
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}
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int gxsha256_update(uint32_t *h, unsigned char *block, gxByteBuffer* data, unsigned int *len, unsigned int *totalLen)
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{
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unsigned int block_nb;
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unsigned int new_len, rem_len, tmp_len;
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const unsigned char *shifted_message;
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tmp_len = 64 - (data->size - data->position);
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rem_len = data->size < tmp_len ? data->size : tmp_len;
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memcpy(&block[data->position], data->data, rem_len);
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if (data->size - data->position < 64)
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{
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data->position = data->size;
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return 0;
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}
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new_len = *len - rem_len;
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block_nb = new_len / 64;
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shifted_message = data->data + rem_len;
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gxsha256_transform(h, block, 1);
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gxsha256_transform(h, shifted_message, block_nb);
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rem_len = new_len % 64;
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memcpy(block, &shifted_message[block_nb << 6], rem_len);
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*len = rem_len;
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*totalLen += (block_nb + 1) << 6;
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return 0;
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}
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int gxsha256_final(uint32_t *h, unsigned char *block, unsigned char *digest, unsigned int len, unsigned int totalLen)
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{
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unsigned int block_nb;
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unsigned int pm_len;
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uint32_t len_b;
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int i;
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block_nb = (1 + ((64 - 9) < (len % 64)));
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len_b = (totalLen + len) << 3;
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pm_len = block_nb << 6;
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memset(block + len, 0, pm_len - len);
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block[len] = 0x80;
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SHA2_UNPACK32(len_b, block + pm_len - 4);
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gxsha256_transform(h, block, block_nb);
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for (i = 0; i < 8; i++)
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{
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SHA2_UNPACK32(h[i], &digest[i << 2]);
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}
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return 0;
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}
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int gxsha256_encrypt(gxByteBuffer* data, gxByteBuffer* digest)
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{
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unsigned int len = data->size, totalLen = 0;
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uint32_t h[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 };
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unsigned char block[128];
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bb_capacity(digest, 32);
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digest->size = 32;
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gxsha256_update((uint32_t*)&h, block, data, &len, &totalLen);
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return gxsha256_final(h, block, digest->data, len, totalLen);
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}
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#endif //DLMS_IGNORE_HIGH_SHA256
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