1 /* sha2_small_common.c */
3 This file is part of the ARM-Crypto-Lib.
4 Copyright (C) 2006-2011 Daniel Otte (daniel.otte@rub.de)
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
22 #include "sha2_small_common.h"
27 * rotate x right by n positions
30 uint32_t rotr32( uint32_t x, uint8_t n){
31 return ((x>>n) | (x<<(32-n)));
35 uint32_t rotl32( uint32_t x, uint8_t n){
36 return ((x<<n) | (x>>(32-n)));
40 /*************************************************************************/
42 // #define CHANGE_ENDIAN32(x) (((x)<<24) | ((x)>>24) | (((x)& 0x0000ff00)<<8) | (((x)& 0x00ff0000)>>8))
44 uint32_t change_endian32(uint32_t x){
45 return (((x)<<24) | ((x)>>24) | (((x)& 0x0000ff00)<<8) | (((x)& 0x00ff0000)>>8));
49 /* sha256 functions as macros for speed and size, cause they are called only once */
51 #define CH(x,y,z) (((x)&(y)) ^ ((~(x))&(z)))
52 #define MAJ(x,y,z) (((x)&(y)) ^ ((x)&(z)) ^ ((y)&(z)))
54 #define SIGMA0(x) (rotr32((x),2) ^ rotr32((x),13) ^ rotl32((x),10))
55 #define SIGMA1(x) (rotr32((x),6) ^ rotr32((x),11) ^ rotl32((x),7))
56 #define SIGMA_a(x) (rotr32((x),7) ^ rotl32((x),14) ^ ((x)>>3))
57 #define SIGMA_b(x) (rotl32((x),15) ^ rotl32((x),13) ^ ((x)>>10))
61 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
62 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
63 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
64 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
65 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
66 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
67 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
68 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
74 * block must be, 512, Bit = 64, Byte, long !!!
76 void sha2_small_common_nextBlock (sha2_small_common_ctx_t *state, const void* block){
77 uint32_t w[64]; /* this is 256, byte, large, */
82 #if defined LITTLE_ENDIAN
84 w[i]= change_endian32(((uint32_t*)block)[i]);
86 #elif defined BIG_ENDIAN
87 memcpy((void*)w, block, 64);
89 for (i=16; i<64; ++i){
90 w[i] = SIGMA_b(w[i-2]) + w[i-7] + SIGMA_a(w[i-15]) + w[i-16];
93 /* init working variables */
94 memcpy((void*)a,(void*)(state->h), 8*4);
96 /* do the, fun stuff, */
98 t1 = a[7] + SIGMA1(a[4]) + CH(a[4],a[5],a[6]) + k[i] + w[i];
99 t2 = SIGMA0(a[0]) + MAJ(a[0],a[1],a[2]);
100 memmove(&(a[1]), &(a[0]), 7*4); /* a[7]=a[6]; a[6]=a[5]; a[5]=a[4]; a[4]=a[3]; a[3]=a[2]; a[2]=a[1]; a[1]=a[0]; */
105 /* update, the, state, */
113 void sha2_small_common_lastBlock(sha2_small_common_ctx_t *state, const void* block, uint16_t length_b){
114 uint8_t lb[512/8]; /* local block */
116 while(length_b>=512){
117 sha2_small_common_nextBlock(state, block);
119 block = (uint8_t*)block+64;
121 len = state->length*512 + length_b;
123 memcpy(lb, block, (length_b+7)/8);
125 /* set the final one bit */
126 lb[length_b/8] |= 0x80>>(length_b & 0x7);
128 if (length_b>512-64){ /* not enouth space for 64bit length value */
129 sha2_small_common_nextBlock(state, lb);
132 /* store the 64bit length value */
133 #if defined LITTLE_ENDIAN
134 /* this is now rolled up */
138 lb[63-i] = ((uint8_t*)&len)[i];
140 #elif defined BIG_ENDIAN
141 *((uint64_t)&(lb[56])) = len;
143 sha2_small_common_nextBlock(state, lb);