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1 /* keecak.c */
2 /*
3     This file is part of the ARM-Crypto-Lib.
4     Copyright (C) 2006-2010  Daniel Otte (daniel.otte@rub.de)
5
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.
10
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.
15
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/>.
18 */
19
20 #include <stdint.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include "memxor.h"
24 #include "keccak.h"
25
26 #ifdef DEBUG
27 #  undef DEBUG
28 #endif
29
30 #define DEBUG 0
31
32 #if DEBUG
33 #include "cli.h"
34
35 void keccak_dump_state(uint64_t a[5][5]){
36         uint8_t i,j;
37         for(i=0; i<5; ++i){
38                 cli_putstr("\r\n");
39                 cli_putc('0'+i);
40                 cli_putstr(": ");
41                 for(j=0; j<5; ++j){
42                         cli_hexdump_rev(&(a[i][j]), 8);
43                         cli_putc(' ');
44                 }
45         }
46 }
47
48 void keccak_dump_ctx(keccak_ctx_t* ctx){
49         keccak_dump_state(ctx->a);
50         cli_putstr("\r\nDBG: r: ");
51         cli_hexdump_rev(&(ctx->r), 2);
52         cli_putstr("\t c: ");
53         cli_hexdump_rev(&(ctx->c), 2);
54         cli_putstr("\t d: ");
55         cli_hexdump(&(ctx->d), 1);
56         cli_putstr("\t bs: ");
57         cli_hexdump(&(ctx->bs), 1);
58 }
59
60 #endif
61
62 static const uint64_t rc[] = {
63        0x0000000000000001LL, 0x0000000000008082LL,
64        0x800000000000808ALL, 0x8000000080008000LL,
65        0x000000000000808BLL, 0x0000000080000001LL,
66        0x8000000080008081LL, 0x8000000000008009LL,
67        0x000000000000008ALL, 0x0000000000000088LL,
68        0x0000000080008009LL, 0x000000008000000ALL,
69        0x000000008000808BLL, 0x800000000000008BLL,
70        0x8000000000008089LL, 0x8000000000008003LL,
71        0x8000000000008002LL, 0x8000000000000080LL,
72        0x000000000000800ALL, 0x800000008000000ALL,
73        0x8000000080008081LL, 0x8000000000008080LL,
74        0x0000000080000001LL, 0x8000000080008008LL
75 };
76
77 static inline
78 uint64_t rotl64(uint64_t a, uint8_t r){
79          return (a<<r)|(a>>(64-r));
80 }
81
82 static const uint8_t r[5][5] = {
83                 {  0, 36,  3, 41, 18 },
84                 {  1, 44, 10, 45,  2 },
85                 { 62,  6, 43, 15, 61 },
86                 { 28, 55, 25, 21, 56 },
87                 { 27, 20, 39,  8, 14 }
88 };
89
90 void keccak_round(uint64_t a[5][5], uint8_t rci){
91         uint64_t b[5][5];
92         uint8_t i,j;
93         /* theta */
94         for(i=0; i<5; ++i){
95                 b[i][0] = a[0][i] ^ a[1][i] ^ a[2][i] ^ a[3][i] ^ a[4][i];
96         }
97         for(i=0; i<5; ++i){
98                 b[i][1] = b[(4+i)%5][0] ^ rotl64(b[(i+1)%5][0], 1);
99                 for(j=0; j<5; ++j){
100                         a[j][i] ^= b[i][1];
101                 }
102         }
103 #if DEBUG
104         cli_putstr("\r\nAfter theta:");
105         keccak_dump_state(a);
106 #endif
107         /* rho & pi */
108         for(i=0; i<5; ++i){
109                 for(j=0; j<5; ++j){
110                         b[(2*i+3*j)%5][j] = rotl64(a[j][i], r[i][j]);
111                 }
112         }
113 #if DEBUG
114         cli_putstr("\r\n--- after rho & pi ---");
115         keccak_dump_state(a);
116 #endif
117         /* chi */
118         for(i=0; i<5; ++i){
119                 for(j=0; j<5; ++j){
120                         a[j][i] =  b[j][i] ^ ((~(b[j][(i+1)%5]))&(b[j][(i+2)%5]));
121                 }
122         }
123 #if DEBUG
124         cli_putstr("\r\nAfter chi:");
125         keccak_dump_state(a);
126 #endif
127         /* iota */
128         uint64_t t;
129         t= rc[rci];
130         a[0][0] ^= t;
131 #if DEBUG
132         cli_putstr("\r\nAfter iota:");
133         keccak_dump_state(a);
134 #endif
135 }
136
137 void keccak_f1600(uint64_t a[5][5]){
138         uint8_t i=0;
139         do{
140 #if DEBUG
141                 cli_putstr("\r\n\r\n--- Round ");
142                 cli_hexdump(&i, 1);
143                 cli_putstr(" ---");
144 #endif
145                 keccak_round(a, i);
146         }while(++i<24);
147 }
148
149 void keccak_nextBlock(keccak_ctx_t* ctx, const void* block){
150         memxor(ctx->a, block, ctx->bs);
151         keccak_f1600(ctx->a);
152 }
153
154 void keccak_lastBlock(keccak_ctx_t* ctx, const void* block, uint16_t length_b){
155         while(length_b>=ctx->r){
156                 keccak_nextBlock(ctx, block);
157                 block = (uint8_t*)block + ctx->bs;
158                 length_b -=  ctx->r;
159         }
160         uint8_t tmp[ctx->bs];
161         uint8_t pad[3];
162         memset(tmp, 0x00, ctx->bs);
163         memcpy(tmp, block, (length_b+7)/8);
164         /* appand 1 */
165         if(length_b&7){
166                 /* we have some single bits */
167                 uint8_t t;
168                 t = tmp[length_b/8]>>(8-(length_b&7));
169                 t |= 0x01<<(length_b&7);
170                 tmp[length_b/8] = t;
171         }else{
172                 tmp[length_b/8] = 0x01;
173         }
174         pad[0] = ctx->d;
175         pad[1] = ctx->bs;
176         pad[2] = 0x01;
177         if(length_b/8+1+3<=ctx->bs){
178                 memcpy(tmp+length_b/8+1, pad, 3);
179         }else{
180                 if(length_b/8+1+2<=ctx->bs){
181                         memcpy(tmp+length_b/8+1, pad, 2);
182                         keccak_nextBlock(ctx, tmp);
183                         memset(tmp, 0x00, ctx->bs);
184                         tmp[0]=0x01;
185                 }else{
186                         if(length_b/8+1+1<=ctx->bs){
187                                 memcpy(tmp+length_b/8+1, pad, 1);
188                                 keccak_nextBlock(ctx, tmp);
189                                 memset(tmp, 0x00, ctx->bs);
190                                 tmp[0] = ctx->bs;
191                                 tmp[1] = 0x01;
192                         }else{
193                                 keccak_nextBlock(ctx, tmp);
194                                 memset(tmp, 0x00, ctx->bs);
195                                 tmp[0] = ctx->d;
196                                 tmp[1] = ctx->bs;
197                                 tmp[2] = 0x01;
198                         }
199                 }
200         }
201         keccak_nextBlock(ctx, tmp);
202 }
203
204 void keccak_ctx2hash(void* dest, uint16_t length_b, keccak_ctx_t* ctx){
205         while(length_b>=ctx->r){
206                 memcpy(dest, ctx->a, ctx->bs);
207                 dest = (uint8_t*)dest + ctx->bs;
208                 length_b -= ctx->r;
209                 keccak_f1600(ctx->a);
210         }
211         memcpy(dest, ctx->a, (length_b+7)/8);
212 }
213
214 void keccak224_ctx2hash(void* dest, keccak_ctx_t* ctx){
215         keccak_ctx2hash(dest, 224, ctx);
216 }
217
218 void keccak256_ctx2hash(void* dest, keccak_ctx_t* ctx){
219         keccak_ctx2hash(dest, 256, ctx);
220 }
221
222 void keccak384_ctx2hash(void* dest, keccak_ctx_t* ctx){
223         keccak_ctx2hash(dest, 384, ctx);
224 }
225
226 void keccak512_ctx2hash(void* dest, keccak_ctx_t* ctx){
227         keccak_ctx2hash(dest, 512, ctx);
228 }
229
230 /*
231 1. SHA3-224: ⌊Keccak[r = 1152, c = 448, d = 28]⌋224
232 2. SHA3-256: ⌊Keccak[r = 1088, c = 512, d = 32]⌋256
233 3. SHA3-384: ⌊Keccak[r = 832, c = 768, d = 48]⌋384
234 4. SHA3-512: ⌊Keccak[r = 576, c = 1024, d = 64]⌋512
235 */
236 void keccak_init(uint16_t r, uint16_t c, uint8_t d, keccak_ctx_t* ctx){
237         memset(ctx->a, 0x00, 5*5*8);
238         ctx->r = r;
239         ctx->c = c;
240         ctx->d = d;
241         ctx->bs = (uint8_t)(r/8);
242 }
243
244 void keccak224_init(keccak_ctx_t* ctx){
245         keccak_init(1152, 448, 28, ctx);
246 }
247
248 void keccak256_init(keccak_ctx_t* ctx){
249         keccak_init(1088, 512, 32, ctx);
250 }
251
252 void keccak384_init(keccak_ctx_t* ctx){
253         keccak_init( 832, 768, 48, ctx);
254 }
255
256 void keccak512_init(keccak_ctx_t* ctx){
257         keccak_init( 576, 1024, 64, ctx);
258 }