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c48c4d78 1//-----------------------------------------------------------------------------
2// Copyright (C) 2016, 2017 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// brute forcing is based on @aczids bitsliced brute forcer
18// https://github.com/aczid/crypto1_bs with some modifications. Mainly:
19// - don't rollback. Start with 2nd byte of nonce instead
20// - reuse results of filter subfunctions
21// - reuse results of previous nonces if some first bits are identical
22//
23//-----------------------------------------------------------------------------
24// aczid's Copyright notice:
25//
26// Bit-sliced Crypto-1 brute-forcing implementation
27// Builds on the data structures returned by CraptEV1 craptev1_get_space(nonces, threshold, uid)
28/*
29Copyright (c) 2015-2016 Aram Verstegen
30
31Permission is hereby granted, free of charge, to any person obtaining a copy
32of this software and associated documentation files (the "Software"), to deal
33in the Software without restriction, including without limitation the rights
34to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
35copies of the Software, and to permit persons to whom the Software is
36furnished to do so, subject to the following conditions:
37
38The above copyright notice and this permission notice shall be included in
39all copies or substantial portions of the Software.
40
41THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
42IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
43FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
44AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
45LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
46OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
47THE SOFTWARE.
48*/
49
50#include "hardnested_bf_core.h"
51
52#include <stdint.h>
53#include <stdbool.h>
54#include <stdlib.h>
55#include <stdio.h>
56#include <malloc.h>
57#include <string.h>
58#include "crapto1/crapto1.h"
59#include "parity.h"
60
61// bitslice type
62// while AVX supports 256 bit vector floating point operations, we need integer operations for boolean logic
63// same for AVX2 and 512 bit vectors
64// using larger vectors works but seems to generate more register pressure
65#if defined(__AVX512F__)
66#define MAX_BITSLICES 512
67#elif defined(__AVX2__)
68#define MAX_BITSLICES 256
69#elif defined(__AVX__)
70#define MAX_BITSLICES 128
71#elif defined(__SSE2__)
72#define MAX_BITSLICES 128
af7a1f70 73#else // MMX or SSE or NOSIMD
c48c4d78 74#define MAX_BITSLICES 64
75#endif
76
77#define VECTOR_SIZE (MAX_BITSLICES/8)
78typedef unsigned int __attribute__((aligned(VECTOR_SIZE))) __attribute__((vector_size(VECTOR_SIZE))) bitslice_value_t;
79typedef union {
80 bitslice_value_t value;
81 uint64_t bytes64[MAX_BITSLICES/64];
82 uint8_t bytes[MAX_BITSLICES/8];
83} bitslice_t;
84
85// filter function (f20)
86// sourced from ``Wirelessly Pickpocketing a Mifare Classic Card'' by Flavio Garcia, Peter van Rossum, Roel Verdult and Ronny Wichers Schreur
87#define f20a(a,b,c,d) (((a|b)^(a&d))^(c&((a^b)|d)))
88#define f20b(a,b,c,d) (((a&b)|c)^((a^b)&(c|d)))
89#define f20c(a,b,c,d,e) ((a|((b|e)&(d^e)))^((a^(b&d))&((c^d)|(b&e))))
90
91// bit indexing
92#define get_bit(n, word) (((word) >> (n)) & 1)
93#define get_vector_bit(slice, value) get_bit((slice)&0x3f, value.bytes64[(slice)>>6])
94
95// size of crypto-1 state
96#define STATE_SIZE 48
97// size of nonce to be decrypted
98#define KEYSTREAM_SIZE 24
99
100// endianness conversion
101#define rev32(word) ((((word) & 0xff) << 24) | ((((word) >> 8) & 0xff) << 16) | ((((word) >> 16) & 0xff) << 8) | ((((word) >> 24) & 0xff)))
102
103// this needs to be compiled several times for each instruction set.
104// For each instruction set, define a dedicated function name:
105#if defined (__AVX512F__)
106#define BITSLICE_TEST_NONCES bitslice_test_nonces_AVX512
107#define CRACK_STATES_BITSLICED crack_states_bitsliced_AVX512
108#elif defined (__AVX2__)
109#define BITSLICE_TEST_NONCES bitslice_test_nonces_AVX2
110#define CRACK_STATES_BITSLICED crack_states_bitsliced_AVX2
111#elif defined (__AVX__)
112#define BITSLICE_TEST_NONCES bitslice_test_nonces_AVX
113#define CRACK_STATES_BITSLICED crack_states_bitsliced_AVX
114#elif defined (__SSE2__)
115#define BITSLICE_TEST_NONCES bitslice_test_nonces_SSE2
116#define CRACK_STATES_BITSLICED crack_states_bitsliced_SSE2
117#elif defined (__MMX__)
118#define BITSLICE_TEST_NONCES bitslice_test_nonces_MMX
119#define CRACK_STATES_BITSLICED crack_states_bitsliced_MMX
af7a1f70 120#else
121#define BITSLICE_TEST_NONCES bitslice_test_nonces_NOSIMD
122#define CRACK_STATES_BITSLICED crack_states_bitsliced_NOSIMD
c48c4d78 123#endif
124
125// typedefs and declaration of functions:
126typedef const uint64_t crack_states_bitsliced_t(uint32_t, uint8_t*, statelist_t*, uint32_t*, uint64_t*, uint32_t, uint8_t*, noncelist_t*);
127crack_states_bitsliced_t crack_states_bitsliced_AVX512;
128crack_states_bitsliced_t crack_states_bitsliced_AVX2;
129crack_states_bitsliced_t crack_states_bitsliced_AVX;
130crack_states_bitsliced_t crack_states_bitsliced_SSE2;
131crack_states_bitsliced_t crack_states_bitsliced_MMX;
af7a1f70 132crack_states_bitsliced_t crack_states_bitsliced_NOSIMD;
c48c4d78 133crack_states_bitsliced_t crack_states_bitsliced_dispatch;
134
135typedef void bitslice_test_nonces_t(uint32_t, uint32_t*, uint8_t*);
136bitslice_test_nonces_t bitslice_test_nonces_AVX512;
137bitslice_test_nonces_t bitslice_test_nonces_AVX2;
138bitslice_test_nonces_t bitslice_test_nonces_AVX;
139bitslice_test_nonces_t bitslice_test_nonces_SSE2;
140bitslice_test_nonces_t bitslice_test_nonces_MMX;
af7a1f70 141bitslice_test_nonces_t bitslice_test_nonces_NOSIMD;
c48c4d78 142bitslice_test_nonces_t bitslice_test_nonces_dispatch;
143
144#ifdef _WIN32
145#define malloc_bitslice(x) __builtin_assume_aligned(_aligned_malloc((x), MAX_BITSLICES/8), MAX_BITSLICES/8)
146#define free_bitslice(x) _aligned_free(x)
147#else
148#define malloc_bitslice(x) memalign(MAX_BITSLICES/8, (x))
149#define free_bitslice(x) free(x)
150#endif
151
c48c4d78 152typedef enum {
153 EVEN_STATE = 0,
154 ODD_STATE = 1
155} odd_even_t;
156
157
158// arrays of bitsliced states with identical values in all slices
159static bitslice_t bitsliced_encrypted_nonces[256][KEYSTREAM_SIZE];
160static bitslice_t bitsliced_encrypted_parity_bits[256][4];
161// 1 and 0 vectors
162static bitslice_t bs_ones;
163static bitslice_t bs_zeroes;
164
165
166void BITSLICE_TEST_NONCES(uint32_t nonces_to_bruteforce, uint32_t *bf_test_nonce, uint8_t *bf_test_nonce_par) {
167
168 // initialize 1 and 0 vectors
169 memset(bs_ones.bytes, 0xff, VECTOR_SIZE);
170 memset(bs_zeroes.bytes, 0x00, VECTOR_SIZE);
171
172 // bitslice nonces' 2nd to 4th byte
173 for (uint32_t i = 0; i < nonces_to_bruteforce; i++) {
174 for(uint32_t bit_idx = 0; bit_idx < KEYSTREAM_SIZE; bit_idx++){
175 bool bit = get_bit(KEYSTREAM_SIZE-1-bit_idx, rev32(bf_test_nonce[i] << 8));
176 if(bit){
177 bitsliced_encrypted_nonces[i][bit_idx].value = bs_ones.value;
178 } else {
179 bitsliced_encrypted_nonces[i][bit_idx].value = bs_zeroes.value;
180 }
181 }
182 }
183 // bitslice nonces' parity (4 bits)
184 for (uint32_t i = 0; i < nonces_to_bruteforce; i++) {
185 for(uint32_t bit_idx = 0; bit_idx < 4; bit_idx++){
186 bool bit = get_bit(4-1-bit_idx, bf_test_nonce_par[i]);
187 if(bit){
188 bitsliced_encrypted_parity_bits[i][bit_idx].value = bs_ones.value;
189 } else {
190 bitsliced_encrypted_parity_bits[i][bit_idx].value = bs_zeroes.value;
191 }
192 }
193 }
194
195}
196
197
198const uint64_t CRACK_STATES_BITSLICED(uint32_t cuid, uint8_t *best_first_bytes, statelist_t *p, uint32_t *keys_found, uint64_t *num_keys_tested, uint32_t nonces_to_bruteforce, uint8_t *bf_test_nonce_2nd_byte, noncelist_t *nonces){
199
200 // Unlike aczid's implementation this doesn't roll back at all when performing bitsliced bruteforce.
201 // We know that the best first byte is already shifted in. Testing with the remaining three bytes of
202 // the nonces is sufficient to eliminate most of them. The small rest is tested with a simple unsliced
203 // brute forcing (including roll back).
204
205 bitslice_t states[KEYSTREAM_SIZE+STATE_SIZE];
206 bitslice_t * restrict state_p;
207 uint64_t key = -1;
208 uint64_t bucket_states_tested = 0;
209 uint32_t bucket_size[(p->len[EVEN_STATE] - 1)/MAX_BITSLICES + 1];
210 uint32_t bitsliced_blocks = 0;
211 uint32_t const *restrict p_even_end = p->states[EVEN_STATE] + p->len[EVEN_STATE];
212#if defined (DEBUG_BRUTE_FORCE)
213 uint32_t elimination_step = 0;
214 #define MAX_ELIMINATION_STEP 32
215 uint64_t keys_eliminated[MAX_ELIMINATION_STEP] = {0};
216#endif
217#ifdef DEBUG_KEY_ELIMINATION
218 bool bucket_contains_test_key[(p->len[EVEN_STATE] - 1)/MAX_BITSLICES + 1];
219#endif
220
221 // constant ones/zeroes
222 bitslice_t bs_ones;
223 memset(bs_ones.bytes, 0xff, VECTOR_SIZE);
224 bitslice_t bs_zeroes;
225 memset(bs_zeroes.bytes, 0x00, VECTOR_SIZE);
226
227 // bitslice all the even states
228 bitslice_t **restrict bitsliced_even_states = (bitslice_t **)malloc(((p->len[EVEN_STATE] - 1)/MAX_BITSLICES + 1) * sizeof(bitslice_t *));
229 if (bitsliced_even_states == NULL) {
230 printf("Out of memory error in brute_force. Aborting...");
231 exit(4);
232 }
233 bitslice_value_t *restrict bitsliced_even_feedback = malloc_bitslice(((p->len[EVEN_STATE] - 1)/MAX_BITSLICES + 1) * sizeof(bitslice_value_t));
234 if (bitsliced_even_feedback == NULL) {
235 printf("Out of memory error in brute_force. Aborting...");
236 exit(4);
237 }
238 for(uint32_t *restrict p_even = p->states[EVEN_STATE]; p_even < p_even_end; p_even += MAX_BITSLICES){
239 bitslice_t *restrict lstate_p = malloc_bitslice(STATE_SIZE/2*sizeof(bitslice_t));
240 if (lstate_p == NULL) {
241 printf("Out of memory error in brute_force. Aborting... \n");
242 exit(4);
243 }
244 memset(lstate_p, 0x00, STATE_SIZE/2*sizeof(bitslice_t)); // zero even bits
245 // bitslice even half-states
246 const uint32_t max_slices = (p_even_end-p_even) < MAX_BITSLICES ? p_even_end-p_even : MAX_BITSLICES;
247 bucket_size[bitsliced_blocks] = max_slices;
248#ifdef DEBUG_KEY_ELIMINATION
249 bucket_contains_test_key[bitsliced_blocks] = false;
250#endif
251 uint32_t slice_idx;
252 for(slice_idx = 0; slice_idx < max_slices; ++slice_idx){
253 uint32_t e = *(p_even+slice_idx);
254#ifdef DEBUG_KEY_ELIMINATION
255 if (known_target_key != -1 && e == test_state[EVEN_STATE]) {
256 bucket_contains_test_key[bitsliced_blocks] = true;
257 // printf("bucket %d contains test key even state\n", bitsliced_blocks);
258 // printf("in slice %d\n", slice_idx);
259 }
260#endif
261 for(uint32_t bit_idx = 0; bit_idx < STATE_SIZE/2; bit_idx++, e >>= 1){
262 // set even bits
263 if(e&1){
264 lstate_p[bit_idx].bytes64[slice_idx>>6] |= 1ull << (slice_idx & 0x3f);
265 }
266 }
267 }
268 // padding with last even state
269 for ( ; slice_idx < MAX_BITSLICES; ++slice_idx) {
270 uint32_t e = *(p_even_end-1);
271 for(uint32_t bit_idx = 0; bit_idx < STATE_SIZE/2; bit_idx++, e >>= 1){
272 // set even bits
273 if(e&1){
274 lstate_p[bit_idx].bytes64[slice_idx>>6] |= 1ull << (slice_idx & 0x3f);
275 }
276 }
277 }
278 bitsliced_even_states[bitsliced_blocks] = lstate_p;
279 // bitsliced_even_feedback[bitsliced_blocks] = bs_ones;
280 bitsliced_even_feedback[bitsliced_blocks] = lstate_p[(47- 0)/2].value ^
281 lstate_p[(47-10)/2].value ^ lstate_p[(47-12)/2].value ^ lstate_p[(47-14)/2].value ^
282 lstate_p[(47-24)/2].value ^ lstate_p[(47-42)/2].value;
283 bitsliced_blocks++;
284 }
285 // bitslice every odd state to every block of even states
286 for(uint32_t const *restrict p_odd = p->states[ODD_STATE]; p_odd < p->states[ODD_STATE] + p->len[ODD_STATE]; ++p_odd){
287 // early abort
288 if(*keys_found){
289 goto out;
290 }
291
292 // set odd state bits and pre-compute first keystream bit vector. This is the same for all blocks of even states
293
294 state_p = &states[KEYSTREAM_SIZE];
295 uint32_t o = *p_odd;
296
297 // pre-compute the odd feedback bit
298 bool odd_feedback_bit = evenparity32(o&0x29ce5c);
299 const bitslice_value_t odd_feedback = odd_feedback_bit ? bs_ones.value : bs_zeroes.value;
300
301 // set odd state bits
302 for (uint32_t state_idx = 0; state_idx < STATE_SIZE; o >>= 1, state_idx += 2) {
303 if (o & 1){
304 state_p[state_idx] = bs_ones;
305 } else {
306 state_p[state_idx] = bs_zeroes;
307 }
308 }
309
310 bitslice_value_t crypto1_bs_f20b_2[16];
311 bitslice_value_t crypto1_bs_f20b_3[8];
312
313 crypto1_bs_f20b_2[0] = f20b(state_p[47-25].value, state_p[47-27].value, state_p[47-29].value, state_p[47-31].value);
314 crypto1_bs_f20b_3[0] = f20b(state_p[47-41].value, state_p[47-43].value, state_p[47-45].value, state_p[47-47].value);
315
316 bitslice_value_t ksb[8];
317 ksb[0] = f20c(f20a(state_p[47- 9].value, state_p[47-11].value, state_p[47-13].value, state_p[47-15].value),
318 f20b(state_p[47-17].value, state_p[47-19].value, state_p[47-21].value, state_p[47-23].value),
319 crypto1_bs_f20b_2[0],
320 f20a(state_p[47-33].value, state_p[47-35].value, state_p[47-37].value, state_p[47-39].value),
321 crypto1_bs_f20b_3[0]);
322
323 uint32_t *restrict p_even = p->states[EVEN_STATE];
324 for (uint32_t block_idx = 0; block_idx < bitsliced_blocks; ++block_idx, p_even += MAX_BITSLICES) {
325
326#ifdef DEBUG_KEY_ELIMINATION
327 // if (known_target_key != -1 && bucket_contains_test_key[block_idx] && *p_odd == test_state[ODD_STATE]) {
328 // printf("Now testing known target key.\n");
329 // printf("block_idx = %d/%d\n", block_idx, bitsliced_blocks);
330 // }
331#endif
332 // add the even state bits
333 const bitslice_t const *restrict bitsliced_even_state = bitsliced_even_states[block_idx];
334 for(uint32_t state_idx = 1; state_idx < STATE_SIZE; state_idx += 2) {
335 state_p[state_idx] = bitsliced_even_state[state_idx/2];
336 }
337
338 // pre-compute first feedback bit vector. This is the same for all nonces
339 bitslice_value_t fbb[8];
340 fbb[0] = odd_feedback ^ bitsliced_even_feedback[block_idx];
341
342 // vector to contain test results (1 = passed, 0 = failed)
343 bitslice_t results = bs_ones;
344
345 // parity_bits
346 bitslice_value_t par[8];
347 par[0] = bs_zeroes.value;
348 uint32_t next_common_bits = 0;
349
350 for(uint32_t tests = 0; tests < nonces_to_bruteforce; ++tests){
351 // common bits with preceding test nonce
352 uint32_t common_bits = next_common_bits; //tests ? trailing_zeros(bf_test_nonce_2nd_byte[tests] ^ bf_test_nonce_2nd_byte[tests-1]) : 0;
353 next_common_bits = tests < nonces_to_bruteforce - 1 ? trailing_zeros(bf_test_nonce_2nd_byte[tests] ^ bf_test_nonce_2nd_byte[tests+1]) : 0;
354 uint32_t parity_bit_idx = 1; // start checking with the parity of second nonce byte
355 bitslice_value_t fb_bits = fbb[common_bits]; // start with precomputed feedback bits from previous nonce
356 bitslice_value_t ks_bits = ksb[common_bits]; // dito for first keystream bits
357 bitslice_value_t parity_bit_vector = par[common_bits]; // dito for first parity vector
358 // bitslice_value_t fb_bits = fbb[0]; // start with precomputed feedback bits from previous nonce
359 // bitslice_value_t ks_bits = ksb[0]; // dito for first keystream bits
360 // bitslice_value_t parity_bit_vector = par[0]; // dito for first parity vector
361 state_p -= common_bits; // and reuse the already calculated state bits
362 // highest bit is transmitted/received first. We start with Bit 23 (highest bit of second nonce byte),
363 // or the highest bit which differs from the previous nonce
364 for (int32_t ks_idx = KEYSTREAM_SIZE-1-common_bits; ks_idx >= 0; --ks_idx) {
365
366 // decrypt nonce bits
367 const bitslice_value_t encrypted_nonce_bit_vector = bitsliced_encrypted_nonces[tests][ks_idx].value;
368 const bitslice_value_t decrypted_nonce_bit_vector = encrypted_nonce_bit_vector ^ ks_bits;
369
370 // compute real parity bits on the fly
371 parity_bit_vector ^= decrypted_nonce_bit_vector;
372
373 // update state
374 state_p--;
375 state_p[0].value = fb_bits ^ decrypted_nonce_bit_vector;
376
377 // update crypto1 subfunctions
378 bitslice_value_t f20a_1, f20b_1, f20b_2, f20a_2, f20b_3;
379 f20a_2 = f20a(state_p[47-33].value, state_p[47-35].value, state_p[47-37].value, state_p[47-39].value);
380 f20b_3 = f20b(state_p[47-41].value, state_p[47-43].value, state_p[47-45].value, state_p[47-47].value);
381 if (ks_idx > KEYSTREAM_SIZE - 8) {
382 f20a_1 = f20a(state_p[47- 9].value, state_p[47-11].value, state_p[47-13].value, state_p[47-15].value);
383 f20b_1 = f20b(state_p[47-17].value, state_p[47-19].value, state_p[47-21].value, state_p[47-23].value);
384 f20b_2 = f20b(state_p[47-25].value, state_p[47-27].value, state_p[47-29].value, state_p[47-31].value);
385 crypto1_bs_f20b_2[KEYSTREAM_SIZE - ks_idx] = f20b_2;
386 crypto1_bs_f20b_3[KEYSTREAM_SIZE - ks_idx] = f20b_3;
387 } else if (ks_idx > KEYSTREAM_SIZE - 16) {
388 f20a_1 = f20a(state_p[47- 9].value, state_p[47-11].value, state_p[47-13].value, state_p[47-15].value);
389 f20b_1 = crypto1_bs_f20b_2[KEYSTREAM_SIZE - ks_idx - 8];
390 f20b_2 = f20b(state_p[47-25].value, state_p[47-27].value, state_p[47-29].value, state_p[47-31].value);
391 crypto1_bs_f20b_2[KEYSTREAM_SIZE - ks_idx] = f20b_2;
392 } else if (ks_idx > KEYSTREAM_SIZE - 24){
393 f20a_1 = f20a(state_p[47- 9].value, state_p[47-11].value, state_p[47-13].value, state_p[47-15].value);
394 f20b_1 = crypto1_bs_f20b_2[KEYSTREAM_SIZE - ks_idx - 8];
395 f20b_2 = crypto1_bs_f20b_3[KEYSTREAM_SIZE - ks_idx - 16];
396 } else {
397 f20a_1 = f20a(state_p[47- 9].value, state_p[47-11].value, state_p[47-13].value, state_p[47-15].value);
398 f20b_1 = f20b(state_p[47-17].value, state_p[47-19].value, state_p[47-21].value, state_p[47-23].value);
399 f20b_2 = f20b(state_p[47-25].value, state_p[47-27].value, state_p[47-29].value, state_p[47-31].value);
400 }
401 // update keystream bit
402 ks_bits = f20c(f20a_1, f20b_1, f20b_2, f20a_2, f20b_3);
403
404 // for each completed byte:
405 if ((ks_idx & 0x07) == 0) {
406 // get encrypted parity bits
407 const bitslice_value_t encrypted_parity_bit_vector = bitsliced_encrypted_parity_bits[tests][parity_bit_idx++].value;
408
409 // decrypt parity bits
410 const bitslice_value_t decrypted_parity_bit_vector = encrypted_parity_bit_vector ^ ks_bits;
411
412 // compare actual parity bits with decrypted parity bits and take count in results vector
413 results.value &= ~parity_bit_vector ^ decrypted_parity_bit_vector;
414
415 // make sure we still have a match in our set
416 // if(memcmp(&results, &bs_zeroes, sizeof(bitslice_t)) == 0){
417
418 // this is much faster on my gcc, because somehow a memcmp needlessly spills/fills all the xmm registers to/from the stack - ???
419 // the short-circuiting also helps
420 if(results.bytes64[0] == 0
421#if MAX_BITSLICES > 64
422 && results.bytes64[1] == 0
423#endif
424#if MAX_BITSLICES > 128
425 && results.bytes64[2] == 0
426 && results.bytes64[3] == 0
427#endif
428 ) {
429#if defined (DEBUG_BRUTE_FORCE)
430 if (elimination_step < MAX_ELIMINATION_STEP) {
431 keys_eliminated[elimination_step] += MAX_BITSLICES;
432 }
433#endif
434#ifdef DEBUG_KEY_ELIMINATION
435 if (known_target_key != -1 && bucket_contains_test_key[block_idx] && *p_odd == test_state[ODD_STATE]) {
436 printf("Known target key eliminated in brute_force.\n");
437 printf("block_idx = %d/%d, nonce = %d/%d\n", block_idx, bitsliced_blocks, tests, nonces_to_bruteforce);
438 }
439#endif
440 goto stop_tests;
441 }
442 // prepare for next nonce byte
443#if defined (DEBUG_BRUTE_FORCE)
444 elimination_step++;
445#endif
446 parity_bit_vector = bs_zeroes.value;
447 }
448 // update feedback bit vector
449 if (ks_idx != 0) {
450 fb_bits =
451 (state_p[47- 0].value ^ state_p[47- 5].value ^ state_p[47- 9].value ^
452 state_p[47-10].value ^ state_p[47-12].value ^ state_p[47-14].value ^
453 state_p[47-15].value ^ state_p[47-17].value ^ state_p[47-19].value ^
454 state_p[47-24].value ^ state_p[47-25].value ^ state_p[47-27].value ^
455 state_p[47-29].value ^ state_p[47-35].value ^ state_p[47-39].value ^
456 state_p[47-41].value ^ state_p[47-42].value ^ state_p[47-43].value);
457 }
458 // remember feedback and keystream vectors for later use
459 uint8_t bit = KEYSTREAM_SIZE - ks_idx;
460 if (bit <= next_common_bits) { // if needed and not yet stored
461 fbb[bit] = fb_bits;
462 ksb[bit] = ks_bits;
463 par[bit] = parity_bit_vector;
464 }
465 }
466 // prepare for next nonce. Revert to initial state
467 state_p = &states[KEYSTREAM_SIZE];
468 }
469
470 // all nonce tests were successful: we've found a possible key in this block!
471 uint32_t *p_even_test = p_even;
472 for (uint32_t results_word = 0; results_word < MAX_BITSLICES / 64; ++results_word) {
473 uint64_t results64 = results.bytes64[results_word];
474 for (uint32_t results_bit = 0; results_bit < 64; results_bit++) {
475 if (results64 & 0x01) {
476 if (verify_key(cuid, nonces, best_first_bytes, *p_odd, *p_even_test)) {
477 struct Crypto1State pcs;
478 pcs.odd = *p_odd;
479 pcs.even = *p_even_test;
480 lfsr_rollback_byte(&pcs, (cuid >> 24) ^ best_first_bytes[0], true);
481 crypto1_get_lfsr(&pcs, &key);
482 bucket_states_tested += 64 * results_word + results_bit;
483 goto out;
484 }
485#ifdef DEBUG_KEY_ELIMINATION
486 if (known_target_key != -1 && *p_even_test == test_state[EVEN_STATE] && *p_odd == test_state[ODD_STATE]) {
487 printf("Known target key eliminated in brute_force verification.\n");
488 printf("block_idx = %d/%d\n", block_idx, bitsliced_blocks);
489 }
490#endif
491 }
492#ifdef DEBUG_KEY_ELIMINATION
493 if (known_target_key != -1 && *p_even_test == test_state[EVEN_STATE] && *p_odd == test_state[ODD_STATE]) {
494 printf("Known target key eliminated in brute_force (results_bit == 0).\n");
495 printf("block_idx = %d/%d\n", block_idx, bitsliced_blocks);
496 }
497#endif
498 results64 >>= 1;
499 p_even_test++;
500 if (p_even_test == p_even_end) {
501 goto stop_tests;
502 }
503 }
504 }
505stop_tests:
506#if defined (DEBUG_BRUTE_FORCE)
507 elimination_step = 0;
508#endif
509 bucket_states_tested += bucket_size[block_idx];
510 // prepare to set new states
511 state_p = &states[KEYSTREAM_SIZE];
512 continue;
513 }
514 }
515out:
516 for(uint32_t block_idx = 0; block_idx < bitsliced_blocks; ++block_idx){
517 free_bitslice(bitsliced_even_states[block_idx]);
518 }
519 free(bitsliced_even_states);
520 free_bitslice(bitsliced_even_feedback);
521 __sync_fetch_and_add(num_keys_tested, bucket_states_tested);
522
523#if defined (DEBUG_BRUTE_FORCE)
524 for (uint32_t i = 0; i < MAX_ELIMINATION_STEP; i++) {
525 printf("Eliminated after %2u test_bytes: %5.2f%%\n", i+1, (float)keys_eliminated[i] / bucket_states_tested * 100);
526 }
527#endif
528 return key;
529}
af7a1f70 530
c48c4d78 531
532
533#ifndef __MMX__
534
535// pointers to functions:
536crack_states_bitsliced_t *crack_states_bitsliced_function_p = &crack_states_bitsliced_dispatch;
537bitslice_test_nonces_t *bitslice_test_nonces_function_p = &bitslice_test_nonces_dispatch;
538
539// determine the available instruction set at runtime and call the correct function
540const uint64_t crack_states_bitsliced_dispatch(uint32_t cuid, uint8_t *best_first_bytes, statelist_t *p, uint32_t *keys_found, uint64_t *num_keys_tested, uint32_t nonces_to_bruteforce, uint8_t *bf_test_nonce_2nd_byte, noncelist_t *nonces) {
af7a1f70 541#if defined (__i386__) || defined (__x86_64__)
e5baf1ef 542 #if (__GNUC__ >= 5) && (__GNUC__ > 5 || __GNUC_MINOR__ > 2)
c48c4d78 543 if (__builtin_cpu_supports("avx512f")) crack_states_bitsliced_function_p = &crack_states_bitsliced_AVX512;
544 else if (__builtin_cpu_supports("avx2")) crack_states_bitsliced_function_p = &crack_states_bitsliced_AVX2;
f950ce1c 545 #else
546 if (__builtin_cpu_supports("avx2")) crack_states_bitsliced_function_p = &crack_states_bitsliced_AVX2;
547 #endif
c48c4d78 548 else if (__builtin_cpu_supports("avx")) crack_states_bitsliced_function_p = &crack_states_bitsliced_AVX;
549 else if (__builtin_cpu_supports("sse2")) crack_states_bitsliced_function_p = &crack_states_bitsliced_SSE2;
550 else if (__builtin_cpu_supports("mmx")) crack_states_bitsliced_function_p = &crack_states_bitsliced_MMX;
af7a1f70 551 else
552#endif
553 crack_states_bitsliced_function_p = &crack_states_bitsliced_NOSIMD;
554
c48c4d78 555 // call the most optimized function for this CPU
556 return (*crack_states_bitsliced_function_p)(cuid, best_first_bytes, p, keys_found, num_keys_tested, nonces_to_bruteforce, bf_test_nonce_2nd_byte, nonces);
557}
558
559void bitslice_test_nonces_dispatch(uint32_t nonces_to_bruteforce, uint32_t *bf_test_nonce, uint8_t *bf_test_nonce_par) {
af7a1f70 560#if defined (__i386__) || defined (__x86_64__)
e5baf1ef 561 #if (__GNUC__ >= 5) && (__GNUC__ > 5 || __GNUC_MINOR__ > 2)
c48c4d78 562 if (__builtin_cpu_supports("avx512f")) bitslice_test_nonces_function_p = &bitslice_test_nonces_AVX512;
563 else if (__builtin_cpu_supports("avx2")) bitslice_test_nonces_function_p = &bitslice_test_nonces_AVX2;
f950ce1c 564 #else
565 if (__builtin_cpu_supports("avx2")) bitslice_test_nonces_function_p = &bitslice_test_nonces_AVX2;
566 #endif
c48c4d78 567 else if (__builtin_cpu_supports("avx")) bitslice_test_nonces_function_p = &bitslice_test_nonces_AVX;
568 else if (__builtin_cpu_supports("sse2")) bitslice_test_nonces_function_p = &bitslice_test_nonces_SSE2;
569 else if (__builtin_cpu_supports("mmx")) bitslice_test_nonces_function_p = &bitslice_test_nonces_MMX;
af7a1f70 570 else
571#endif
572 bitslice_test_nonces_function_p = &bitslice_test_nonces_NOSIMD;
573
c48c4d78 574 // call the most optimized function for this CPU
575 (*bitslice_test_nonces_function_p)(nonces_to_bruteforce, bf_test_nonce, bf_test_nonce_par);
576}
577
578// Entries to dispatched function calls
579const uint64_t crack_states_bitsliced(uint32_t cuid, uint8_t *best_first_bytes, statelist_t *p, uint32_t *keys_found, uint64_t *num_keys_tested, uint32_t nonces_to_bruteforce, uint8_t *bf_test_nonce_2nd_byte, noncelist_t *nonces) {
580 return (*crack_states_bitsliced_function_p)(cuid, best_first_bytes, p, keys_found, num_keys_tested, nonces_to_bruteforce, bf_test_nonce_2nd_byte, nonces);
581}
582
583void bitslice_test_nonces(uint32_t nonces_to_bruteforce, uint32_t *bf_test_nonce, uint8_t *bf_test_nonce_par) {
584 (*bitslice_test_nonces_function_p)(nonces_to_bruteforce, bf_test_nonce, bf_test_nonce_par);
585}
586
587#endif
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