3 This file is part of the Crypto-avr-lib/microcrypt-lib.
4 Copyright (C) 2008 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/>.
23 * \brief SEED parts in C for AVR
29 #include <avr/pgmspace.h>
31 #include "seed_sbox.h"
37 uint32_t g_function(uint32_t x);
38 /******************************************************************************/
41 void changeendian32(uint32_t * a){
42 *a = (*a & 0x000000FF) << 24 |
43 (*a & 0x0000FF00) << 8 |
44 (*a & 0x00FF0000) >> 8 |
45 (*a & 0xFF000000) >> 24;
48 /******************************************************************************/
50 uint32_t bigendian_sum32(uint32_t a, uint32_t b){
58 /******************************************************************************/
60 uint32_t bigendian_sub32(uint32_t a, uint32_t b){
68 /******************************************************************************/
70 uint64_t bigendian_rotl8_64(uint64_t a){
73 a = (a<<8) | (a>>(64-8));
76 a = (a>>8) | (a<<(64-8));
80 /******************************************************************************/
82 uint64_t bigendian_rotr8_64(uint64_t a){
85 a = (a>>8) | (a<<(64-8));
88 a = (a<<8) | (a>>(64-8));
92 /******************************************************************************/
94 uint64_t f_function(uint64_t a, uint32_t k0, uint32_t k1){
97 c = a & 0x00000000FFFFFFFFLL;
98 d = (a>>32) & 0x00000000FFFFFFFFLL;
103 c = bigendian_sum32(c,d);
105 d = bigendian_sum32(c,d);
107 c = bigendian_sum32(c,d);
108 a = ((uint64_t)d << 32) | c;
112 /******************************************************************************/
118 #define X3 (((uint8_t*)(&x))[0])
119 #define X2 (((uint8_t*)(&x))[1])
120 #define X1 (((uint8_t*)(&x))[2])
121 #define X0 (((uint8_t*)(&x))[3])
123 #define Z3 (((uint8_t*)(&z))[0])
124 #define Z2 (((uint8_t*)(&z))[1])
125 #define Z1 (((uint8_t*)(&z))[2])
126 #define Z0 (((uint8_t*)(&z))[3])
129 uint32_t g_function(uint32_t x){
131 /* sbox substitution */
132 X3 = pgm_read_byte(&(seed_sbox2[X3]));
133 X2 = pgm_read_byte(&(seed_sbox1[X2]));
134 X1 = pgm_read_byte(&(seed_sbox2[X1]));
135 X0 = pgm_read_byte(&(seed_sbox1[X0]));
136 /* now the permutation */
137 Z0 = (X0 & M0) ^ (X1 & M1) ^ (X2 & M2) ^ (X3 & M3);
138 Z1 = (X0 & M1) ^ (X1 & M2) ^ (X2 & M3) ^ (X3 & M0);
139 Z2 = (X0 & M2) ^ (X1 & M3) ^ (X2 & M0) ^ (X3 & M1);
140 Z3 = (X0 & M3) ^ (X1 & M0) ^ (X2 & M1) ^ (X3 & M2);
143 /******************************************************************************/
148 keypair_t getnextkeys(uint32_t *keystate, uint8_t curround){
154 /* ret.k0 = g_function(keystate[0] + keystate[2] - pgm_read_dword(&(seed_kc[curround])));
155 ret.k1 = g_function(keystate[1] - keystate[3] + pgm_read_dword(&(seed_kc[curround]))); */
156 ret.k0 = bigendian_sum32(keystate[0], keystate[2]);
157 ret.k0 = bigendian_sub32(ret.k0, pgm_read_dword(&(seed_kc[curround])));
158 ret.k0 = g_function(ret.k0);
159 ret.k1 = bigendian_sub32(keystate[1], keystate[3]);
160 ret.k1 = bigendian_sum32(ret.k1, pgm_read_dword(&(seed_kc[curround])));
161 ret.k1 = g_function(ret.k1);
164 /* odd round (1,3,5, ...) */
165 ((uint64_t*)keystate)[1] = bigendian_rotl8_64( ((uint64_t*)keystate)[1] );
167 /* even round (0,2,4, ...) */
168 ((uint64_t*)keystate)[0] = bigendian_rotr8_64(((uint64_t*)keystate)[0]);
175 /******************************************************************************/
177 keypair_t getprevkeys(uint32_t *keystate, uint8_t curround){
184 /* odd round (1,3,5, ..., 15) */
185 ((uint64_t*)keystate)[1] = bigendian_rotr8_64( ((uint64_t*)keystate)[1] );
187 /* even round (0,2,4, ..., 14) */
188 ((uint64_t*)keystate)[0] = bigendian_rotl8_64(((uint64_t*)keystate)[0]);
190 /* ret.k0 = g_function(keystate[0] + keystate[2] - pgm_read_dword(&(seed_kc[curround])));
191 ret.k1 = g_function(keystate[1] - keystate[3] + pgm_read_dword(&(seed_kc[curround]))); */
192 ret.k0 = bigendian_sum32(keystate[0], keystate[2]);
193 ret.k0 = bigendian_sub32(ret.k0, pgm_read_dword(&(seed_kc[curround])));
194 ret.k0 = g_function(ret.k0);
195 ret.k1 = bigendian_sub32(keystate[1], keystate[3]);
196 ret.k1 = bigendian_sum32(ret.k1, pgm_read_dword(&(seed_kc[curround])));
197 ret.k1 = g_function(ret.k1);
202 /******************************************************************************/
208 /******************************************************************************/
210 void seed_init(uint8_t * key, seed_ctx_t * ctx){
211 memcpy(ctx->k, key, 128/8);
214 /******************************************************************************/
216 #define L (((uint64_t*)buffer)[0])
217 #define R (((uint64_t*)buffer)[1])
219 void seed_enc(void * buffer, seed_ctx_t * ctx){
223 k = getnextkeys(ctx->k, 2*r);
225 DEBUG_S("\r\n\tDBG ka,0: "); uart_hexdump(&k.k0, 4);
226 DEBUG_S("\r\n\tDBG ka,1: "); uart_hexdump(&k.k1, 4);
227 DEBUG_S("\r\n\t DBG L: "); uart_hexdump((uint8_t*)buffer+0, 8);
228 DEBUG_S("\r\n\t DBG R: "); uart_hexdump((uint8_t*)buffer+8, 8);
230 L ^= f_function(R,k.k0,k.k1);
232 k = getnextkeys(ctx->k, 2*r+1);
234 DEBUG_S("\r\n\tDBG kb,0: "); uart_hexdump(&k.k0, 4);
235 DEBUG_S("\r\n\tDBG kb,1: "); uart_hexdump(&k.k1, 4);
236 DEBUG_S("\r\n\t DBG L: "); uart_hexdump((uint8_t*)buffer+8, 8);
237 DEBUG_S("\r\n\t DBG R: "); uart_hexdump((uint8_t*)buffer+0, 8);
239 R ^= f_function(L,k.k0,k.k1);
241 /* just an exchange without temp. variable */
247 /******************************************************************************/
249 #define L (((uint64_t*)buffer)[0])
250 #define R (((uint64_t*)buffer)[1])
252 void seed_dec(void * buffer, seed_ctx_t * ctx){
256 k = getprevkeys(ctx->k, 2*r+1);
258 DEBUG_S("\r\n\tDBG ka,0: "); uart_hexdump(&k.k0, 4);
259 DEBUG_S("\r\n\tDBG ka,1: "); uart_hexdump(&k.k1, 4);
260 DEBUG_S("\r\n\t DBG L: "); uart_hexdump((uint8_t*)buffer+0, 8);
261 DEBUG_S("\r\n\t DBG R: "); uart_hexdump((uint8_t*)buffer+8, 8);
263 L ^= f_function(R,k.k0,k.k1);
265 k = getprevkeys(ctx->k, 2*r+0);
267 DEBUG_S("\r\n\tDBG kb,0: "); uart_hexdump(&k.k0, 4);
268 DEBUG_S("\r\n\tDBG kb,1: "); uart_hexdump(&k.k1, 4);
269 DEBUG_S("\r\n\t DBG L: "); uart_hexdump((uint8_t*)buffer+8, 8);
270 DEBUG_S("\r\n\t DBG R: "); uart_hexdump((uint8_t*)buffer+0, 8);
272 R ^= f_function(L,k.k0,k.k1);
274 /* just an exchange without temp. variable */