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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 uint64_t rotl64(uint64_t a, uint8_t r){
78          return (a<<r)|(a>>(64-r));
79 }
80
81 static const uint8_t r[5][5] = {
82                 {  0, 36,  3, 41, 18 },
83                 {  1, 44, 10, 45,  2 },
84                 { 62,  6, 43, 15, 61 },
85                 { 28, 55, 25, 21, 56 },
86                 { 27, 20, 39,  8, 14 }
87 };
88
89 void keccak_round(uint64_t a[5][5], uint8_t rci){
90         uint64_t b[5][5];
91         uint8_t i,j;
92         /* theta */
93         for(i=0; i<5; ++i){
94                 b[i][0] = a[0][i] ^ a[1][i] ^ a[2][i] ^ a[3][i] ^ a[4][i];
95         }
96         for(i=0; i<5; ++i){
97                 b[i][1] = b[(4+i)%5][0] ^ rotl64(b[(i+1)%5][0], 1);
98         }
99         for(i=0; i<5; ++i){
100                 for(j=0; j<5; ++j){
101                         a[j][i] ^= b[i][1];
102                 }
103         }
104 #if DEBUG
105         cli_putstr("\r\nAfter theta:");
106         keccak_dump_state(a);
107 #endif
108         /* rho & pi */
109         for(i=0; i<5; ++i){
110                 for(j=0; j<5; ++j){
111                         b[(2*i+3*j)%5][j] = rotl64(a[j][i], r[i][j]);
112                 }
113         }
114 #if DEBUG
115         cli_putstr("\r\n--- after rho & pi ---");
116         keccak_dump_state(a);
117 #endif
118         /* chi */
119         for(i=0; i<5; ++i){
120                 for(j=0; j<5; ++j){
121                         a[j][i] =  b[j][i] ^ ((~(b[j][(i+1)%5]))&(b[j][(i+2)%5]));
122                 }
123         }
124 #if DEBUG
125         cli_putstr("\r\nAfter chi:");
126         keccak_dump_state(a);
127 #endif
128         /* iota */
129         uint64_t t;
130         t= rc[rci];
131         a[0][0] ^= t;
132 #if DEBUG
133         cli_putstr("\r\nAfter iota:");
134         keccak_dump_state(a);
135 #endif
136 }
137
138 void keccak_f1600(uint64_t a[5][5]){
139         uint8_t i=0;
140         do{
141 #if DEBUG
142                 cli_putstr("\r\n\r\n--- Round ");
143                 cli_hexdump(&i, 1);
144                 cli_putstr(" ---");
145 #endif
146                 keccak_round(a, i);
147         }while(++i<24);
148 }
149
150 void keccak_nextBlock(keccak_ctx_t* ctx, const void* block){
151         memxor(ctx->a, block, ctx->bs);
152         keccak_f1600(ctx->a);
153 }
154
155 void keccak_lastBlock(keccak_ctx_t* ctx, const void* block, uint16_t length_b){
156         while(length_b>=ctx->r){
157                 keccak_nextBlock(ctx, block);
158                 block = (uint8_t*)block + ctx->bs;
159                 length_b -=  ctx->r;
160         }
161         uint8_t tmp[ctx->bs];
162         uint8_t pad[3];
163         memset(tmp, 0x00, ctx->bs);
164         memcpy(tmp, block, (length_b+7)/8);
165         /* appand 1 */
166         if(length_b&7){
167                 /* we have some single bits */
168                 uint8_t t;
169                 t = tmp[length_b/8]>>(8-(length_b&7));
170                 t |= 0x01<<(length_b&7);
171                 tmp[length_b/8] = t;
172         }else{
173                 tmp[length_b/8] = 0x01;
174         }
175         pad[0] = ctx->d;
176         pad[1] = ctx->bs;
177         pad[2] = 0x01;
178         if(length_b/8+1+3<=ctx->bs){
179                 memcpy(tmp+length_b/8+1, pad, 3);
180         }else{
181                 if(length_b/8+1+2<=ctx->bs){
182                         memcpy(tmp+length_b/8+1, pad, 2);
183                         keccak_nextBlock(ctx, tmp);
184                         memset(tmp, 0x00, ctx->bs);
185                         tmp[0]=0x01;
186                 }else{
187                         if(length_b/8+1+1<=ctx->bs){
188                                 memcpy(tmp+length_b/8+1, pad, 1);
189                                 keccak_nextBlock(ctx, tmp);
190                                 memset(tmp, 0x00, ctx->bs);
191                                 tmp[0] = ctx->bs;
192                                 tmp[1] = 0x01;
193                         }else{
194                                 keccak_nextBlock(ctx, tmp);
195                                 memset(tmp, 0x00, ctx->bs);
196                                 tmp[0] = ctx->d;
197                                 tmp[1] = ctx->bs;
198                                 tmp[2] = 0x01;
199                         }
200                 }
201         }
202         keccak_nextBlock(ctx, tmp);
203 }
204
205 void keccak_ctx2hash(void* dest, uint16_t length_b, keccak_ctx_t* ctx){
206         while(length_b>=ctx->r){
207                 memcpy(dest, ctx->a, ctx->bs);
208                 dest = (uint8_t*)dest + ctx->bs;
209                 length_b -= ctx->r;
210                 keccak_f1600(ctx->a);
211         }
212         memcpy(dest, ctx->a, (length_b+7)/8);
213 }
214
215 void keccak224_ctx2hash(void* dest, keccak_ctx_t* ctx){
216         keccak_ctx2hash(dest, 224, ctx);
217 }
218
219 void keccak256_ctx2hash(void* dest, keccak_ctx_t* ctx){
220         keccak_ctx2hash(dest, 256, ctx);
221 }
222
223 void keccak384_ctx2hash(void* dest, keccak_ctx_t* ctx){
224         keccak_ctx2hash(dest, 384, ctx);
225 }
226
227 void keccak512_ctx2hash(void* dest, keccak_ctx_t* ctx){
228         keccak_ctx2hash(dest, 512, ctx);
229 }
230
231 /*
232 1. SHA3-224: ⌊Keccak[r = 1152, c = 448, d = 28]⌋224
233 2. SHA3-256: ⌊Keccak[r = 1088, c = 512, d = 32]⌋256
234 3. SHA3-384: ⌊Keccak[r = 832, c = 768, d = 48]⌋384
235 4. SHA3-512: ⌊Keccak[r = 576, c = 1024, d = 64]⌋512
236 */
237 void keccak_init(uint16_t r, uint16_t c, uint8_t d, keccak_ctx_t* ctx){
238         memset(ctx->a, 0x00, 5*5*8);
239         ctx->r = r;
240         ctx->c = c;
241         ctx->d = d;
242         ctx->bs = (uint8_t)(r/8);
243 }
244
245 void keccak224_init(keccak_ctx_t* ctx){
246         keccak_init(1152, 448, 28, ctx);
247 }
248
249 void keccak256_init(keccak_ctx_t* ctx){
250         keccak_init(1088, 512, 32, ctx);
251 }
252
253 void keccak384_init(keccak_ctx_t* ctx){
254         keccak_init( 832, 768, 48, ctx);
255 }
256
257 void keccak512_init(keccak_ctx_t* ctx){
258         keccak_init( 576, 1024, 64, ctx);
259 }