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Merge pull request #486 from KenzyCarey/master
[proxmark3-svn] / client / hardnested / hardnested_tables.c
1 //-----------------------------------------------------------------------------
2 // Copyright (C) 2015, 2016 by piwi
3 //
4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
5 // at your option, any later version. See the LICENSE.txt file for the text of
6 // the license.
7 //-----------------------------------------------------------------------------
8 // Implements a card only attack based on crypto text (encrypted nonces
9 // received during a nested authentication) only. Unlike other card only
10 // attacks this doesn't rely on implementation errors but only on the
11 // inherent weaknesses of the crypto1 cypher. Described in
12 // Carlo Meijer, Roel Verdult, "Ciphertext-only Cryptanalysis on Hardened
13 // Mifare Classic Cards" in Proceedings of the 22nd ACM SIGSAC Conference on
14 // Computer and Communications Security, 2015
15 //-----------------------------------------------------------------------------
16 //
17 // This program calculates tables with possible states for a given
18 // bitflip property.
19 //
20 //-----------------------------------------------------------------------------
21
22 #include <inttypes.h>
23 #include <stdbool.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <stdio.h>
27 #include <time.h>
28 #include "crapto1/crapto1.h"
29 #include "parity.h"
30
31
32 #define NUM_PART_SUMS 9
33 #define BITFLIP_2ND_BYTE 0x0200
34
35 typedef enum {
36 EVEN_STATE = 0,
37 ODD_STATE = 1
38 } odd_even_t;
39
40
41 static uint16_t PartialSumProperty(uint32_t state, odd_even_t odd_even)
42 {
43 uint16_t sum = 0;
44 for (uint16_t j = 0; j < 16; j++) {
45 uint32_t st = state;
46 uint16_t part_sum = 0;
47 if (odd_even == ODD_STATE) {
48 for (uint16_t i = 0; i < 5; i++) {
49 part_sum ^= filter(st);
50 st = (st << 1) | ((j >> (3-i)) & 0x01) ;
51 }
52 part_sum ^= 1; // XOR 1 cancelled out for the other 8 bits
53 } else {
54 for (uint16_t i = 0; i < 4; i++) {
55 st = (st << 1) | ((j >> (3-i)) & 0x01) ;
56 part_sum ^= filter(st);
57 }
58 }
59 sum += part_sum;
60 }
61 return sum;
62 }
63
64
65 //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
66 // bitarray functions
67
68 #define malloc_bitarray(x) __builtin_assume_aligned(_aligned_malloc(x, __BIGGEST_ALIGNMENT__), __BIGGEST_ALIGNMENT__)
69 #define free_bitarray(x) _aligned_free(x)
70
71 static inline void clear_bitarray24(uint32_t *bitarray)
72 {
73 memset(bitarray, 0x00, sizeof(uint32_t) * (1<<19));
74 }
75
76
77 static inline uint32_t test_bit24(uint32_t *bitarray, uint32_t index)
78 {
79 return bitarray[index>>5] & (0x80000000>>(index&0x0000001f));
80 }
81
82
83 static inline void set_bit24(uint32_t *bitarray, uint32_t index)
84 {
85 bitarray[index>>5] |= 0x80000000>>(index&0x0000001f);
86 }
87
88
89 static inline uint32_t next_state(uint32_t *bitset, uint32_t state)
90 {
91 if (++state == 1<<24) return 1<<24;
92 uint32_t index = state >> 5;
93 uint_fast8_t bit = state & 0x1f;
94 uint32_t line = bitset[index] << bit;
95 while (bit <= 0x1f) {
96 if (line & 0x80000000) return state;
97 state++;
98 bit++;
99 line <<= 1;
100 }
101 index++;
102 while (bitset[index] == 0x00000000 && state < 1<<24) {
103 index++;
104 state += 0x20;
105 }
106 if (state >= 1<<24) return 1<<24;
107 #if defined __GNUC__
108 return state + __builtin_clz(bitset[index]);
109 #else
110 bit = 0x00;
111 line = bitset[index];
112 while (bit <= 0x1f) {
113 if (line & 0x80000000) return state;
114 state++;
115 bit++;
116 line <<= 1;
117 }
118 return 1<<24;
119 #endif
120 }
121
122
123 static inline uint32_t next_not_state(uint32_t *bitset, uint32_t state)
124 {
125 if (++state == 1<<24) return 1<<24;
126 uint32_t index = state >> 5;
127 uint_fast8_t bit = state & 0x1f;
128 uint32_t line = bitset[index] << bit;
129 while (bit <= 0x1f) {
130 if ((line & 0x80000000) == 0) return state;
131 state++;
132 bit++;
133 line <<= 1;
134 }
135 index++;
136 while (bitset[index] == 0xffffffff && state < 1<<24) {
137 index++;
138 state += 0x20;
139 }
140 if (state >= 1<<24) return 1<<24;
141 #if defined __GNUC__
142 return state + __builtin_clz(~bitset[index]);
143 #else
144 bit = 0x00;
145 line = bitset[index];
146 while (bit <= 0x1f) {
147 if ((line & 0x80000000) == 0) return state;
148 state++;
149 bit++;
150 line <<= 1;
151 }
152 return 1<<24;
153 #endif
154 }
155
156
157 static inline uint32_t bitcount(uint32_t a)
158 {
159 #if defined __GNUC__
160 return __builtin_popcountl(a);
161 #else
162 a = a - ((a >> 1) & 0x55555555);
163 a = (a & 0x33333333) + ((a >> 2) & 0x33333333);
164 return (((a + (a >> 4)) & 0x0f0f0f0f) * 0x01010101) >> 24;
165 #endif
166 }
167
168
169 static inline uint32_t count_states(uint32_t *bitset)
170 {
171 uint32_t count = 0;
172 for (uint32_t i = 0; i < (1<<19); i++) {
173 count += bitcount(bitset[i]);
174 }
175 return count;
176 }
177
178
179 static void write_bitflips_file(odd_even_t odd_even, uint16_t bitflip, int sum_a0, uint32_t *bitset, uint32_t count)
180 {
181 char filename[80];
182 sprintf(filename, "bitflip_%d_%03" PRIx16 "_sum%d_states.bin", odd_even, bitflip, sum_a0);
183 FILE *outfile = fopen(filename, "wb");
184 fwrite(&count, 1, sizeof(count), outfile);
185 fwrite(bitset, 1, sizeof(uint32_t)*(1<<19), outfile);
186 fclose(outfile);
187 }
188
189
190 uint32_t *restrict part_sum_a0_bitarrays[2][NUM_PART_SUMS];
191
192 static void init_part_sum_bitarrays(void)
193 {
194 printf("init_part_sum_bitarrays()...");
195 for (odd_even_t odd_even = EVEN_STATE; odd_even <= ODD_STATE; odd_even++) {
196 for (uint16_t part_sum_a0 = 0; part_sum_a0 < NUM_PART_SUMS; part_sum_a0++) {
197 part_sum_a0_bitarrays[odd_even][part_sum_a0] = (uint32_t *)malloc_bitarray(sizeof(uint32_t) * (1<<19));
198 if (part_sum_a0_bitarrays[odd_even][part_sum_a0] == NULL) {
199 printf("Out of memory error in init_part_suma0_statelists(). Aborting...\n");
200 exit(4);
201 }
202 clear_bitarray24(part_sum_a0_bitarrays[odd_even][part_sum_a0]);
203 }
204 }
205 for (odd_even_t odd_even = EVEN_STATE; odd_even <= ODD_STATE; odd_even++) {
206 //printf("(%d, %" PRIu16 ")...", odd_even, part_sum_a0);
207 for (uint32_t state = 0; state < (1<<20); state++) {
208 uint16_t part_sum_a0 = PartialSumProperty(state, odd_even) / 2;
209 for (uint16_t low_bits = 0; low_bits < 1<<4; low_bits++) {
210 set_bit24(part_sum_a0_bitarrays[odd_even][part_sum_a0], state<<4 | low_bits);
211 }
212 }
213 }
214 printf("done.\n");
215 }
216
217
218 static void free_part_sum_bitarrays(void)
219 {
220 printf("free_part_sum_bitarrays()...");
221 for (int16_t part_sum_a0 = (NUM_PART_SUMS-1); part_sum_a0 >= 0; part_sum_a0--) {
222 free_bitarray(part_sum_a0_bitarrays[ODD_STATE][part_sum_a0]);
223 }
224 for (int16_t part_sum_a0 = (NUM_PART_SUMS-1); part_sum_a0 >= 0; part_sum_a0--) {
225 free_bitarray(part_sum_a0_bitarrays[EVEN_STATE][part_sum_a0]);
226 }
227 printf("done.\n");
228 }
229
230 uint32_t *restrict sum_a0_bitarray[2];
231
232 void init_sum_bitarray(uint16_t sum_a0)
233 {
234 printf("init_sum_bitarray()...\n");
235 for (odd_even_t odd_even = EVEN_STATE; odd_even <= ODD_STATE; odd_even++) {
236 sum_a0_bitarray[odd_even] = (uint32_t *)malloc_bitarray(sizeof(uint32_t) * (1<<19));
237 if (sum_a0_bitarray[odd_even] == NULL) {
238 printf("Out of memory error in init_sum_bitarrays(). Aborting...\n");
239 exit(4);
240 }
241 clear_bitarray24(sum_a0_bitarray[odd_even]);
242 }
243 for (uint8_t p = 0; p < NUM_PART_SUMS; p++) {
244 for (uint8_t q = 0; q < NUM_PART_SUMS; q++) {
245 if (sum_a0 == 2*p*(16-2*q) + (16-2*p)*2*q) {
246 for (uint32_t i = 0; i < (1<<19); i++) {
247 sum_a0_bitarray[EVEN_STATE][i] |= part_sum_a0_bitarrays[EVEN_STATE][q][i];
248 sum_a0_bitarray[ODD_STATE][i] |= part_sum_a0_bitarrays[ODD_STATE][p][i];
249 }
250 }
251 }
252 }
253 for (odd_even_t odd_even = EVEN_STATE; odd_even <= ODD_STATE; odd_even++) {
254 uint32_t count = count_states(sum_a0_bitarray[odd_even]);
255 printf("sum_a0_bitarray[%s] has %d states (%5.2f%%)\n", odd_even==EVEN_STATE?"even":"odd ", count, (float)count/(1<<24)*100.0);
256 }
257 printf("done.\n");
258 }
259
260
261 static void free_sum_bitarray(void)
262 {
263 printf("free_sum_bitarray()...");
264 free_bitarray(sum_a0_bitarray[ODD_STATE]);
265 free_bitarray(sum_a0_bitarray[EVEN_STATE]);
266 printf("done.\n");
267 }
268
269
270 static void precalculate_bit0_bitflip_bitarrays(uint8_t const bitflip, uint16_t const sum_a0)
271 {
272 // #define TEST_RUN
273 #ifdef TEST_RUN
274 #define NUM_TEST_STATES (1<<10)
275 #else
276 #define NUM_TEST_STATES (1<<23)
277 #endif
278
279 time_t start_time = time(NULL);
280 time_t last_check_time = start_time;
281
282 uint32_t *restrict test_bitarray[2];
283 uint32_t *restrict test_not_bitarray[2];
284
285 test_bitarray[EVEN_STATE] = malloc_bitarray(sizeof(uint32_t) * (1<<19));
286 clear_bitarray24(test_bitarray[EVEN_STATE]);
287 test_bitarray[ODD_STATE] = malloc_bitarray(sizeof(uint32_t) * (1<<19));
288 clear_bitarray24(test_bitarray[ODD_STATE]);
289
290 test_not_bitarray[EVEN_STATE] = malloc_bitarray(sizeof(uint32_t) * (1<<19));
291 clear_bitarray24(test_not_bitarray[EVEN_STATE]);
292 test_not_bitarray[ODD_STATE] = malloc_bitarray(sizeof(uint32_t) * (1<<19));
293 clear_bitarray24(test_not_bitarray[ODD_STATE]);
294
295 uint32_t count[2];
296 bool all_odd_states_are_possible_for_notbitflip = false;
297
298 printf("\n\nStarting search for crypto1 states resulting in bitflip property 0x%03x...\n", bitflip);
299 for (uint32_t even_state = next_state(sum_a0_bitarray[EVEN_STATE], -1); even_state < NUM_TEST_STATES; even_state = next_state(sum_a0_bitarray[EVEN_STATE], even_state)) {
300 bool even_state_is_possible = false;
301 time_t time_now = time(NULL);
302 if (difftime(time_now, last_check_time) > 5*60) { // print status every 5 minutes
303 float runtime = difftime(time_now, start_time);
304 float remaining_time = runtime * ((1<<23) - even_state) / even_state;
305 printf("\n%1.1f hours elapsed, expected completion in %1.1f hours (%1.1f days)", runtime/3600, remaining_time/3600, remaining_time/3600/24);
306 last_check_time = time_now;
307 }
308 for (uint32_t odd_state = next_state(sum_a0_bitarray[ODD_STATE], -1); odd_state < (1<<24); odd_state = next_state(test_bitarray[ODD_STATE], odd_state)) {
309 if (even_state_is_possible && test_bit24(test_bitarray[ODD_STATE], odd_state)) continue;
310 // load crypto1 state
311 struct Crypto1State cs;
312 cs.odd = odd_state >> 4;
313 cs.even = even_state >> 4;
314
315 // track flipping bits in state
316 struct Crypto1DeltaState {
317 uint_fast8_t odd;
318 uint_fast8_t even;
319 } cs_delta;
320 cs_delta.odd = 0;
321 cs_delta.even = 0;
322
323 uint_fast16_t keystream = 0;
324
325 // decrypt 9 bits
326 for (int i = 0; i < 9; i++) {
327 uint_fast8_t keystream_bit = filter(cs.odd & 0x000fffff) ^ filter((cs.odd & 0x000fffff) ^ cs_delta.odd);
328 keystream = keystream << 1 | keystream_bit;
329 uint_fast8_t nt_bit = BIT(bitflip, i) ^ keystream_bit;
330 uint_fast8_t LSFR_feedback = BIT(cs_delta.odd, 2) ^ BIT(cs_delta.even, 2) ^ BIT(cs_delta.odd, 3);
331
332 cs_delta.even = cs_delta.even << 1 | (LSFR_feedback ^ nt_bit);
333 uint_fast8_t tmp = cs_delta.odd;
334 cs_delta.odd = cs_delta.even;
335 cs_delta.even = tmp;
336
337 cs.even = cs.odd;
338 if (i & 1) {
339 cs.odd = odd_state >> (7 - i) / 2;
340 } else {
341 cs.odd = even_state >> (7 - i) / 2;
342 }
343 }
344
345 if (evenparity32(keystream) == evenparity32(bitflip)) {
346 // found valid bitflip state
347 even_state_is_possible = true;
348 set_bit24(test_bitarray[EVEN_STATE], even_state);
349 set_bit24(test_bitarray[EVEN_STATE], 1 << 23 | even_state);
350 set_bit24(test_bitarray[ODD_STATE], odd_state);
351 } else {
352 // found valid !bitflip state
353 set_bit24(test_not_bitarray[EVEN_STATE], even_state);
354 set_bit24(test_not_bitarray[EVEN_STATE], 1 << 23 | even_state);
355 set_bit24(test_not_bitarray[ODD_STATE], odd_state);
356 }
357 }
358 if (!even_state_is_possible) {
359 all_odd_states_are_possible_for_notbitflip = true;
360 }
361 }
362
363 printf("\nAnalysis completed. Checking for effective bitflip properties...\n");
364 for (odd_even_t odd_even = EVEN_STATE; odd_even <= ODD_STATE; odd_even++) {
365 count[odd_even] = count_states(test_bitarray[odd_even]);
366 if (count[odd_even] != 1<<24) {
367 printf("Writing %d possible %s states for bitflip property %03x (%d (%1.2f%%) states eliminated)\n",
368 count[odd_even],
369 odd_even==EVEN_STATE?"even":"odd",
370 bitflip, (1<<24) - count[odd_even],
371 (float)((1<<24) - count[odd_even]) / (1<<24) * 100.0);
372 #ifndef TEST_RUN
373 write_bitflips_file(odd_even, bitflip, sum_a0, test_bitarray[odd_even], count[odd_even]);
374 #endif
375 } else {
376 printf("All %s states for bitflip property %03x are possible. No file written.\n", odd_even==EVEN_STATE?"even":"odd", bitflip);
377 }
378 }
379 uint32_t *restrict test_bitarray_2nd = malloc_bitarray(sizeof(uint32_t) * (1<<19));
380 clear_bitarray24(test_bitarray_2nd);
381 for (odd_even_t odd_even = EVEN_STATE; odd_even <= ODD_STATE; odd_even++) {
382 if (count[odd_even] != 1<<24) {
383 for (uint32_t state = 0; state < (1<<24); state += 1<<4) {
384 uint32_t line = test_bitarray[odd_even][state>>5];
385 uint16_t half_line = state&0x000000010 ? line&0x0000ffff : line>>16;
386 if (half_line != 0) {
387 for (uint32_t low_bits = 0; low_bits < (1<<4); low_bits++) {
388 set_bit24(test_bitarray_2nd, low_bits << 20 | state >> 4);
389 }
390 }
391 }
392 count[odd_even] = count_states(test_bitarray_2nd);
393 if (count[odd_even] != 1<<24) {
394 printf("Writing %d possible %s states for bitflip property %03x (%d (%1.2f%%) states eliminated)\n",
395 count[odd_even],
396 odd_even==EVEN_STATE?"even":"odd",
397 bitflip | BITFLIP_2ND_BYTE, (1<<24) - count[odd_even],
398 (float)((1<<24) - count[odd_even]) / (1<<24) * 100.0);
399 #ifndef TEST_RUN
400 write_bitflips_file(odd_even, bitflip | BITFLIP_2ND_BYTE, sum_a0, test_bitarray_2nd, count[odd_even]);
401 #endif
402 } else {
403 printf("All %s states for bitflip property %03x are possible. No file written.\n", odd_even==EVEN_STATE?"even":"odd", bitflip | BITFLIP_2ND_BYTE);
404 }
405 } else {
406 printf("All %s states for bitflip property %03x are possible. No file written.\n", odd_even==EVEN_STATE?"even":"odd", bitflip | BITFLIP_2ND_BYTE);
407 }
408 }
409
410 ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
411 // second run for the remaining "not bitflip" states
412 printf("\n\nStarting search for crypto1 states resulting in bitflip property 0x%03x...", bitflip | 0x100);
413 start_time = time(NULL);
414 last_check_time = start_time;
415 for (uint32_t even_state = next_state(sum_a0_bitarray[EVEN_STATE], -1); even_state < NUM_TEST_STATES; even_state = next_state(sum_a0_bitarray[EVEN_STATE], even_state)) {
416 bool even_state_is_possible = test_bit24(test_not_bitarray[EVEN_STATE], even_state);
417 time_t time_now = time(NULL);
418 if (difftime(time_now, last_check_time) > 5*60) { // print status every 5 minutes
419 float runtime = difftime(time_now, start_time);
420 float remaining_time = runtime * ((1<<23) - even_state) / even_state;
421 printf("\n%1.1f hours elapsed, expected completion in %1.1f hours (%1.1f days)", runtime/3600, remaining_time/3600, remaining_time/3600/24);
422 last_check_time = time_now;
423 }
424 for (uint32_t odd_state = next_state(sum_a0_bitarray[ODD_STATE], -1); odd_state < (1<<24); odd_state = next_state(sum_a0_bitarray[ODD_STATE], odd_state)) {
425 if (even_state_is_possible) {
426 if (all_odd_states_are_possible_for_notbitflip) break;
427 if (test_bit24(test_not_bitarray[ODD_STATE], odd_state)) continue;
428 }
429 // load crypto1 state
430 struct Crypto1State cs;
431 cs.odd = odd_state >> 4;
432 cs.even = even_state >> 4;
433
434 // track flipping bits in state
435 struct Crypto1DeltaState {
436 uint_fast8_t odd;
437 uint_fast8_t even;
438 } cs_delta;
439 cs_delta.odd = 0;
440 cs_delta.even = 0;
441
442 uint_fast16_t keystream = 0;
443 // uint_fast16_t nt = 0;
444
445 // decrypt 9 bits
446 for (int i = 0; i < 9; i++) {
447 uint_fast8_t keystream_bit = filter(cs.odd & 0x000fffff) ^ filter((cs.odd & 0x000fffff) ^ cs_delta.odd);
448 keystream = keystream << 1 | keystream_bit;
449 uint_fast8_t nt_bit = BIT(bitflip|0x100, i) ^ keystream_bit;
450 uint_fast8_t LSFR_feedback = BIT(cs_delta.odd, 2) ^ BIT(cs_delta.even, 2) ^ BIT(cs_delta.odd, 3);
451
452 cs_delta.even = cs_delta.even << 1 | (LSFR_feedback ^ nt_bit);
453 uint_fast8_t tmp = cs_delta.odd;
454 cs_delta.odd = cs_delta.even;
455 cs_delta.even = tmp;
456
457 cs.even = cs.odd;
458 if (i & 1) {
459 cs.odd = odd_state >> (7 - i) / 2;
460 } else {
461 cs.odd = even_state >> (7 - i) / 2;
462 }
463 }
464
465 if (evenparity32(keystream) != evenparity32(bitflip)) {
466 // found valid !bitflip state
467 even_state_is_possible = true;
468 set_bit24(test_not_bitarray[EVEN_STATE], even_state);
469 set_bit24(test_not_bitarray[EVEN_STATE], 1 << 23 | even_state);
470 set_bit24(test_not_bitarray[ODD_STATE], odd_state);
471 }
472 }
473 }
474
475 printf("\nAnalysis completed. Checking for effective !bitflip properties...\n");
476 for (odd_even_t odd_even = EVEN_STATE; odd_even <= ODD_STATE; odd_even++) {
477 count[odd_even] = count_states(test_not_bitarray[odd_even]);
478 if (count[odd_even] != 1<<24) {
479 printf("Writing %d possible %s states for bitflip property %03x (%d (%1.2f%%) states eliminated)\n",
480 count[odd_even],
481 odd_even==EVEN_STATE?"even":"odd",
482 bitflip|0x100, (1<<24) - count[odd_even],
483 (float)((1<<24) - count[odd_even]) / (1<<24) * 100.0);
484 #ifndef TEST_RUN
485 write_bitflips_file(odd_even, bitflip|0x100, sum_a0, test_not_bitarray[odd_even], count[odd_even]);
486 #endif
487 } else {
488 printf("All %s states for bitflip property %03x are possible. No file written.\n", odd_even==EVEN_STATE?"even":"odd", bitflip|0x100);
489 }
490 }
491
492 clear_bitarray24(test_bitarray_2nd);
493 for (odd_even_t odd_even = EVEN_STATE; odd_even <= ODD_STATE; odd_even++) {
494 if (count[odd_even] != 1<<24) {
495 for (uint32_t state = 0; state < (1<<24); state += 1<<4) {
496 uint32_t line = test_not_bitarray[odd_even][state>>5];
497 uint16_t half_line = state&0x000000010 ? line&0x0000ffff : line>>16;
498 if (half_line != 0) {
499 for (uint32_t low_bits = 0; low_bits < (1<<4); low_bits++) {
500 set_bit24(test_bitarray_2nd, low_bits << 20 | state >> 4);
501 }
502 }
503 }
504 count[odd_even] = count_states(test_bitarray_2nd);
505 if (count[odd_even] != 1<<24) {
506 printf("Writing %d possible %s states for bitflip property %03x (%d (%1.2f%%) states eliminated)\n",
507 count[odd_even],
508 odd_even==EVEN_STATE?"even":"odd",
509 bitflip | 0x100| BITFLIP_2ND_BYTE, (1<<24) - count[odd_even],
510 (float)((1<<24) - count[odd_even]) / (1<<24) * 100.0);
511 #ifndef TEST_RUN
512 write_bitflips_file(odd_even, bitflip | 0x100 | BITFLIP_2ND_BYTE, sum_a0, test_bitarray_2nd, count[odd_even]);
513 #endif
514 } else {
515 printf("All %s states for bitflip property %03x are possible. No file written.\n", odd_even==EVEN_STATE?"even":"odd", bitflip | 0x100 | BITFLIP_2ND_BYTE);
516 }
517 } else {
518 printf("All %s states for bitflip property %03x are possible. No file written.\n", odd_even==EVEN_STATE?"even":"odd", bitflip | 0x100 | BITFLIP_2ND_BYTE);
519 }
520 }
521
522 free_bitarray(test_bitarray_2nd);
523 free_bitarray(test_not_bitarray[ODD_STATE]);
524 free_bitarray(test_not_bitarray[EVEN_STATE]);
525 free_bitarray(test_bitarray[ODD_STATE]);
526 free_bitarray(test_bitarray[EVEN_STATE]);
527
528 exit(0);
529 }
530
531
532 int main (int argc, char *argv[]) {
533
534 unsigned int bitflip_in;
535 int sum_a0;
536
537 printf("Create tables required by hardnested attack.\n");
538 printf("Expect a runtime in the range of days or weeks.\n");
539 printf("Single thread only. If you want to use several threads, start it multiple times :-)\n\n");
540
541 if (argc != 2 && argc != 3) {
542 printf(" syntax: %s <bitflip property> [<Sum_a0>]\n\n", argv[0]);
543 printf(" example: %s 1f\n", argv[0]);
544 return 1;
545 }
546
547 sscanf(argv[1],"%x", &bitflip_in);
548
549 if (bitflip_in > 255) {
550 printf("Bitflip property must be less than or equal to 0xff\n\n");
551 return 1;
552 }
553
554 if(argc == 3) {
555 sscanf(argv[2], "%d", &sum_a0);
556 }
557
558 switch (sum_a0) {
559 case 0:
560 case 32:
561 case 56:
562 case 64:
563 case 80:
564 case 96:
565 case 104:
566 case 112:
567 case 120:
568 case 128:
569 case 136:
570 case 144:
571 case 152:
572 case 160:
573 case 176:
574 case 192:
575 case 200:
576 case 224:
577 case 256: break;
578 default: sum_a0 = -1;
579 }
580
581 printf("Calculating for bitflip = %02x, sum_a0 = %d\n", bitflip_in, sum_a0);
582
583 init_part_sum_bitarrays();
584 init_sum_bitarray(sum_a0);
585
586 precalculate_bit0_bitflip_bitarrays(bitflip_in, sum_a0);
587
588 free_sum_bitarray();
589 free_part_sum_bitarrays();
590
591 return 0;
592 }
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