Update ikeys.c (#537)
[proxmark3-svn] / client / loclass / ikeys.c
1 /*****************************************************************************
2 * WARNING
3 *
4 * THIS CODE IS CREATED FOR EXPERIMENTATION AND EDUCATIONAL USE ONLY.
5 *
6 * USAGE OF THIS CODE IN OTHER WAYS MAY INFRINGE UPON THE INTELLECTUAL
7 * PROPERTY OF OTHER PARTIES, SUCH AS INSIDE SECURE AND HID GLOBAL,
8 * AND MAY EXPOSE YOU TO AN INFRINGEMENT ACTION FROM THOSE PARTIES.
9 *
10 * THIS CODE SHOULD NEVER BE USED TO INFRINGE PATENTS OR INTELLECTUAL PROPERTY RIGHTS.
11 *
12 *****************************************************************************
13 *
14 * This file is part of loclass. It is a reconstructon of the cipher engine
15 * used in iClass, and RFID techology.
16 *
17 * The implementation is based on the work performed by
18 * Flavio D. Garcia, Gerhard de Koning Gans, Roel Verdult and
19 * Milosch Meriac in the paper "Dismantling IClass".
20 *
21 * Copyright (C) 2014 Martin Holst Swende
22 *
23 * This is free software: you can redistribute it and/or modify
24 * it under the terms of the GNU General Public License version 2 as published
25 * by the Free Software Foundation, or, at your option, any later version.
26 *
27 * This file is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
31 *
32 * You should have received a copy of the GNU General Public License
33 * along with loclass. If not, see <http://www.gnu.org/licenses/>.
34 *
35 *
36 ****************************************************************************/
37
38 /**
39
40
41 From "Dismantling iclass":
42 This section describes in detail the built-in key diversification algorithm of iClass.
43 Besides the obvious purpose of deriving a card key from a master key, this
44 algorithm intends to circumvent weaknesses in the cipher by preventing the
45 usage of certain ‘weak’ keys. In order to compute a diversified key, the iClass
46 reader first encrypts the card identity id with the master key K, using single
47 DES. The resulting ciphertext is then input to a function called hash0 which
48 outputs the diversified key k.
49
50 k = hash0(DES enc (id, K))
51
52 Here the DES encryption of id with master key K outputs a cryptogram c
53 of 64 bits. These 64 bits are divided as c = x, y, z [0] , . . . , z [7] ∈ F 82 × F 82 × (F 62 ) 8
54 which is used as input to the hash0 function. This function introduces some
55 obfuscation by performing a number of permutations, complement and modulo
56 operations, see Figure 2.5. Besides that, it checks for and removes patterns like
57 similar key bytes, which could produce a strong bias in the cipher. Finally, the
58 output of hash0 is the diversified card key k = k [0] , . . . , k [7] ∈ (F 82 ) 8 .
59
60
61 **/
62
63
64 #include <stdint.h>
65 #include <stdbool.h>
66 #include <string.h>
67 #include <stdio.h>
68 #include <inttypes.h>
69 #include "fileutils.h"
70 #include "cipherutils.h"
71 #include "polarssl/des.h"
72
73 uint8_t pi[35] = {0x0F,0x17,0x1B,0x1D,0x1E,0x27,0x2B,0x2D,0x2E,0x33,0x35,0x39,0x36,0x3A,0x3C,0x47,0x4B,0x4D,0x4E,0x53,0x55,0x56,0x59,0x5A,0x5C,0x63,0x65,0x66,0x69,0x6A,0x6C,0x71,0x72,0x74,0x78};
74
75 static des_context ctx_enc = {DES_ENCRYPT,{0}};
76 static des_context ctx_dec = {DES_DECRYPT,{0}};
77
78 static int debug_print = 0;
79
80 /**
81 * @brief The key diversification algorithm uses 6-bit bytes.
82 * This implementation uses 64 bit uint to pack seven of them into one
83 * variable. When they are there, they are placed as follows:
84 * XXXX XXXX N0 .... N7, occupying the lsat 48 bits.
85 *
86 * This function picks out one from such a collection
87 * @param all
88 * @param n bitnumber
89 * @return
90 */
91 uint8_t getSixBitByte(uint64_t c, int n)
92 {
93 return (c >> (42-6*n)) & 0x3F;
94 }
95
96 /**
97 * @brief Puts back a six-bit 'byte' into a uint64_t.
98 * @param c buffer
99 * @param z the value to place there
100 * @param n bitnumber.
101 */
102 void pushbackSixBitByte(uint64_t *c, uint8_t z, int n)
103 {
104 //0x XXXX YYYY ZZZZ ZZZZ ZZZZ
105 // ^z0 ^z7
106 //z0: 1111 1100 0000 0000
107
108 uint64_t masked = z & 0x3F;
109 uint64_t eraser = 0x3F;
110 masked <<= 42-6*n;
111 eraser <<= 42-6*n;
112
113 //masked <<= 6*n;
114 //eraser <<= 6*n;
115
116 eraser = ~eraser;
117 (*c) &= eraser;
118 (*c) |= masked;
119
120 }
121 /**
122 * @brief Swaps the z-values.
123 * If the input value has format XYZ0Z1...Z7, the output will have the format
124 * XYZ7Z6...Z0 instead
125 * @param c
126 * @return
127 */
128 uint64_t swapZvalues(uint64_t c)
129 {
130 uint64_t newz = 0;
131 pushbackSixBitByte(&newz, getSixBitByte(c,0),7);
132 pushbackSixBitByte(&newz, getSixBitByte(c,1),6);
133 pushbackSixBitByte(&newz, getSixBitByte(c,2),5);
134 pushbackSixBitByte(&newz, getSixBitByte(c,3),4);
135 pushbackSixBitByte(&newz, getSixBitByte(c,4),3);
136 pushbackSixBitByte(&newz, getSixBitByte(c,5),2);
137 pushbackSixBitByte(&newz, getSixBitByte(c,6),1);
138 pushbackSixBitByte(&newz, getSixBitByte(c,7),0);
139 newz |= (c & 0xFFFF000000000000);
140 return newz;
141 }
142
143 /**
144 * @return 4 six-bit bytes chunked into a uint64_t,as 00..00a0a1a2a3
145 */
146 uint64_t ck(int i, int j, uint64_t z)
147 {
148
149 if(i == 1 && j == -1)
150 {
151 // ck(1, −1, z [0] . . . z [3] ) = z [0] . . . z [3]
152 return z;
153
154 }else if( j == -1)
155 {
156 // ck(i, −1, z [0] . . . z [3] ) = ck(i − 1, i − 2, z [0] . . . z [3] )
157 return ck(i-1,i-2, z);
158 }
159
160 if(getSixBitByte(z,i) == getSixBitByte(z,j))
161 {
162
163 //ck(i, j − 1, z [0] . . . z [i] ← j . . . z [3] )
164 uint64_t newz = 0;
165 int c;
166 for(c = 0; c < 4 ;c++)
167 {
168 uint8_t val = getSixBitByte(z,c);
169 if(c == i)
170 {
171 pushbackSixBitByte(&newz, j, c);
172 }else
173 {
174 pushbackSixBitByte(&newz, val, c);
175 }
176 }
177 return ck(i,j-1,newz);
178 }else
179 {
180 return ck(i,j-1,z);
181 }
182 }
183 /**
184
185 Definition 8.
186 Let the function check : (F 62 ) 8 → (F 62 ) 8 be defined as
187 check(z [0] . . . z [7] ) = ck(3, 2, z [0] . . . z [3] ) · ck(3, 2, z [4] . . . z [7] )
188
189 where ck : N × N × (F 62 ) 4 → (F 62 ) 4 is defined as
190
191 ck(1, −1, z [0] . . . z [3] ) = z [0] . . . z [3]
192 ck(i, −1, z [0] . . . z [3] ) = ck(i − 1, i − 2, z [0] . . . z [3] )
193 ck(i, j, z [0] . . . z [3] ) =
194 ck(i, j − 1, z [0] . . . z [i] ← j . . . z [3] ), if z [i] = z [j] ;
195 ck(i, j − 1, z [0] . . . z [3] ), otherwise
196
197 otherwise.
198 **/
199
200 uint64_t check(uint64_t z)
201 {
202 //These 64 bits are divided as c = x, y, z [0] , . . . , z [7]
203
204 // ck(3, 2, z [0] . . . z [3] )
205 uint64_t ck1 = ck(3,2, z );
206
207 // ck(3, 2, z [4] . . . z [7] )
208 uint64_t ck2 = ck(3,2, z << 24);
209
210 //The ck function will place the values
211 // in the middle of z.
212 ck1 &= 0x00000000FFFFFF000000;
213 ck2 &= 0x00000000FFFFFF000000;
214
215 return ck1 | ck2 >> 24;
216
217 }
218
219 void permute(BitstreamIn *p_in, uint64_t z,int l,int r, BitstreamOut* out)
220 {
221 if(bitsLeft(p_in) == 0)
222 {
223 return;
224 }
225 bool pn = tailBit(p_in);
226 if( pn ) // pn = 1
227 {
228 uint8_t zl = getSixBitByte(z,l);
229
230 push6bits(out, zl+1);
231 permute(p_in, z, l+1,r, out);
232 }else // otherwise
233 {
234 uint8_t zr = getSixBitByte(z,r);
235
236 push6bits(out, zr);
237 permute(p_in,z,l,r+1,out);
238 }
239 }
240 void printbegin()
241 {
242 if(debug_print <2)
243 return ;
244
245 prnlog(" | x| y|z0|z1|z2|z3|z4|z5|z6|z7|");
246 }
247
248 void printState(char* desc, uint64_t c)
249 {
250 if(debug_print < 2)
251 return ;
252
253 printf("%s : ", desc);
254 uint8_t x = (c & 0xFF00000000000000 ) >> 56;
255 uint8_t y = (c & 0x00FF000000000000 ) >> 48;
256 printf(" %02x %02x", x,y);
257 int i ;
258 for(i =0 ; i < 8 ; i++)
259 {
260 printf(" %02x", getSixBitByte(c,i));
261 }
262 printf("\n");
263 }
264
265 /**
266 * @brief
267 *Definition 11. Let the function hash0 : F 82 × F 82 × (F 62 ) 8 → (F 82 ) 8 be defined as
268 * hash0(x, y, z [0] . . . z [7] ) = k [0] . . . k [7] where
269 * z'[i] = (z[i] mod (63-i)) + i i = 0...3
270 * z'[i+4] = (z[i+4] mod (64-i)) + i i = 0...3
271 * ẑ = check(z');
272 * @param c
273 * @param k this is where the diversified key is put (should be 8 bytes)
274 * @return
275 */
276 void hash0(uint64_t c, uint8_t k[8])
277 {
278 c = swapZvalues(c);
279
280 printbegin();
281 printState("origin",c);
282 //These 64 bits are divided as c = x, y, z [0] , . . . , z [7]
283 // x = 8 bits
284 // y = 8 bits
285 // z0-z7 6 bits each : 48 bits
286 uint8_t x = (c & 0xFF00000000000000 ) >> 56;
287 uint8_t y = (c & 0x00FF000000000000 ) >> 48;
288 int n;
289 uint8_t zn, zn4, _zn, _zn4;
290 uint64_t zP = 0;
291
292 for(n = 0; n < 4 ; n++)
293 {
294 zn = getSixBitByte(c,n);
295
296 zn4 = getSixBitByte(c,n+4);
297
298 _zn = (zn % (63-n)) + n;
299 _zn4 = (zn4 % (64-n)) + n;
300
301
302 pushbackSixBitByte(&zP, _zn,n);
303 pushbackSixBitByte(&zP, _zn4,n+4);
304
305 }
306 printState("0|0|z'",zP);
307
308 uint64_t zCaret = check(zP);
309 printState("0|0|z^",zP);
310
311
312 uint8_t p = pi[x % 35];
313
314 if(x & 1) //Check if x7 is 1
315 {
316 p = ~p;
317 }
318
319 if(debug_print >= 2) prnlog("p:%02x", p);
320
321 BitstreamIn p_in = { &p, 8,0 };
322 uint8_t outbuffer[] = {0,0,0,0,0,0,0,0};
323 BitstreamOut out = {outbuffer,0,0};
324 permute(&p_in,zCaret,0,4,&out);//returns 48 bits? or 6 8-bytes
325
326 //Out is now a buffer containing six-bit bytes, should be 48 bits
327 // if all went well
328 //Shift z-values down onto the lower segment
329
330 uint64_t zTilde = x_bytes_to_num(outbuffer,8);
331
332 zTilde >>= 16;
333
334 printState("0|0|z~", zTilde);
335
336 int i;
337 int zerocounter =0 ;
338 for(i =0 ; i < 8 ; i++)
339 {
340
341 // the key on index i is first a bit from y
342 // then six bits from z,
343 // then a bit from p
344
345 // Init with zeroes
346 k[i] = 0;
347 // First, place yi leftmost in k
348 //k[i] |= (y << i) & 0x80 ;
349
350 // First, place y(7-i) leftmost in k
351 k[i] |= (y << (7-i)) & 0x80 ;
352
353
354
355 uint8_t zTilde_i = getSixBitByte(zTilde, i);
356 // zTildeI is now on the form 00XXXXXX
357 // with one leftshift, it'll be
358 // 0XXXXXX0
359 // So after leftshift, we can OR it into k
360 // However, when doing complement, we need to
361 // again MASK 0XXXXXX0 (0x7E)
362 zTilde_i <<= 1;
363
364 //Finally, add bit from p or p-mod
365 //Shift bit i into rightmost location (mask only after complement)
366 uint8_t p_i = p >> i & 0x1;
367
368 if( k[i] )// yi = 1
369 {
370 //printf("k[%d] +1\n", i);
371 k[i] |= ~zTilde_i & 0x7E;
372 k[i] |= p_i & 1;
373 k[i] += 1;
374
375 }else // otherwise
376 {
377 k[i] |= zTilde_i & 0x7E;
378 k[i] |= (~p_i) & 1;
379 }
380 if((k[i] & 1 )== 0)
381 {
382 zerocounter ++;
383 }
384 }
385 }
386 /**
387 * @brief Performs Elite-class key diversification
388 * @param csn
389 * @param key
390 * @param div_key
391 */
392 void diversifyKey(uint8_t csn[8], uint8_t key[8], uint8_t div_key[8])
393 {
394
395 // Prepare the DES key
396 des_setkey_enc( &ctx_enc, key);
397
398 uint8_t crypted_csn[8] = {0};
399
400 // Calculate DES(CSN, KEY)
401 des_crypt_ecb(&ctx_enc,csn, crypted_csn);
402
403 //Calculate HASH0(DES))
404 uint64_t crypt_csn = x_bytes_to_num(crypted_csn, 8);
405 //uint64_t crypted_csn_swapped = swapZvalues(crypt_csn);
406
407 hash0(crypt_csn,div_key);
408 }
409
410
411
412
413
414 void testPermute()
415 {
416
417 uint64_t x = 0;
418 pushbackSixBitByte(&x,0x00,0);
419 pushbackSixBitByte(&x,0x01,1);
420 pushbackSixBitByte(&x,0x02,2);
421 pushbackSixBitByte(&x,0x03,3);
422 pushbackSixBitByte(&x,0x04,4);
423 pushbackSixBitByte(&x,0x05,5);
424 pushbackSixBitByte(&x,0x06,6);
425 pushbackSixBitByte(&x,0x07,7);
426
427 uint8_t mres[8] = { getSixBitByte(x, 0),
428 getSixBitByte(x, 1),
429 getSixBitByte(x, 2),
430 getSixBitByte(x, 3),
431 getSixBitByte(x, 4),
432 getSixBitByte(x, 5),
433 getSixBitByte(x, 6),
434 getSixBitByte(x, 7)};
435 printarr("input_perm", mres,8);
436
437 uint8_t p = ~pi[0];
438 BitstreamIn p_in = { &p, 8,0 };
439 uint8_t outbuffer[] = {0,0,0,0,0,0,0,0};
440 BitstreamOut out = {outbuffer,0,0};
441
442 permute(&p_in, x,0,4, &out);
443
444 uint64_t permuted = x_bytes_to_num(outbuffer,8);
445 //printf("zTilde 0x%"PRIX64"\n", zTilde);
446 permuted >>= 16;
447
448 uint8_t res[8] = { getSixBitByte(permuted, 0),
449 getSixBitByte(permuted, 1),
450 getSixBitByte(permuted, 2),
451 getSixBitByte(permuted, 3),
452 getSixBitByte(permuted, 4),
453 getSixBitByte(permuted, 5),
454 getSixBitByte(permuted, 6),
455 getSixBitByte(permuted, 7)};
456 printarr("permuted", res, 8);
457 }
458
459 //These testcases are
460 //{ UID , TEMP_KEY, DIV_KEY} using the specific key
461 typedef struct
462 {
463 uint8_t uid[8];
464 uint8_t t_key[8];
465 uint8_t div_key[8];
466 } Testcase;
467
468
469 int testDES(Testcase testcase, des_context ctx_enc, des_context ctx_dec)
470 {
471 uint8_t des_encrypted_csn[8] = {0};
472 uint8_t decrypted[8] = {0};
473 uint8_t div_key[8] = {0};
474 int retval = des_crypt_ecb(&ctx_enc,testcase.uid,des_encrypted_csn);
475 retval |= des_crypt_ecb(&ctx_dec,des_encrypted_csn,decrypted);
476
477 if(memcmp(testcase.uid,decrypted,8) != 0)
478 {
479 //Decryption fail
480 prnlog("Encryption <-> Decryption FAIL");
481 printarr("Input", testcase.uid, 8);
482 printarr("Decrypted", decrypted, 8);
483 retval = 1;
484 }
485
486 if(memcmp(des_encrypted_csn,testcase.t_key,8) != 0)
487 {
488 //Encryption fail
489 prnlog("Encryption != Expected result");
490 printarr("Output", des_encrypted_csn, 8);
491 printarr("Expected", testcase.t_key, 8);
492 retval = 1;
493 }
494 uint64_t crypted_csn = x_bytes_to_num(des_encrypted_csn,8);
495 hash0(crypted_csn, div_key);
496
497 if(memcmp(div_key, testcase.div_key ,8) != 0)
498 {
499 //Key diversification fail
500 prnlog("Div key != expected result");
501 printarr(" csn ", testcase.uid,8);
502 printarr("{csn} ", des_encrypted_csn,8);
503 printarr("hash0 ", div_key, 8);
504 printarr("Expected", testcase.div_key, 8);
505 retval = 1;
506
507 }
508 return retval;
509 }
510 bool des_getParityBitFromKey(uint8_t key)
511 {//The top 7 bits is used
512 bool parity = ((key & 0x80) >> 7)
513 ^ ((key & 0x40) >> 6) ^ ((key & 0x20) >> 5)
514 ^ ((key & 0x10) >> 4) ^ ((key & 0x08) >> 3)
515 ^ ((key & 0x04) >> 2) ^ ((key & 0x02) >> 1);
516 return !parity;
517 }
518
519
520 void des_checkParity(uint8_t* key)
521 {
522 int i;
523 int fails =0;
524 for(i =0 ; i < 8 ; i++)
525 {
526 bool parity = des_getParityBitFromKey(key[i]);
527 if(parity != (key[i] & 0x1))
528 {
529 fails++;
530 prnlog("[+] parity1 fail, byte %d [%02x] was %d, should be %d",i,key[i],(key[i] & 0x1),parity);
531 }
532 }
533 if(fails)
534 {
535 prnlog("[+] parity fails: %d", fails);
536 }else
537 {
538 prnlog("[+] Key syntax is with parity bits inside each byte");
539 }
540 }
541
542 Testcase testcases[] ={
543
544 {{0x8B,0xAC,0x60,0x1F,0x53,0xB8,0xED,0x11},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0x07}},
545 {{0xAE,0x51,0xE5,0x62,0xE7,0x9A,0x99,0x39},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01},{0x04,0x02,0x06,0x08,0x01,0x03,0x05,0x07}},
546 {{0x9B,0x21,0xE4,0x31,0x6A,0x00,0x29,0x62},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x02},{0x06,0x04,0x02,0x08,0x01,0x03,0x05,0x07}},
547 {{0x65,0x24,0x0C,0x41,0x4F,0xC2,0x21,0x93},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x04},{0x0A,0x04,0x06,0x08,0x01,0x03,0x05,0x07}},
548 {{0x7F,0xEB,0xAE,0x93,0xE5,0x30,0x08,0xBD},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x08},{0x12,0x04,0x06,0x08,0x01,0x03,0x05,0x07}},
549 {{0x49,0x7B,0x70,0x74,0x9B,0x35,0x1B,0x83},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x10},{0x22,0x04,0x06,0x08,0x01,0x03,0x05,0x07}},
550 {{0x02,0x3C,0x15,0x6B,0xED,0xA5,0x64,0x6C},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20},{0x42,0x04,0x06,0x08,0x01,0x03,0x05,0x07}},
551 {{0xE8,0x37,0xE0,0xE2,0xC6,0x45,0x24,0xF3},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x40},{0x02,0x06,0x04,0x08,0x01,0x03,0x05,0x07}},
552 {{0xAB,0xBD,0x30,0x05,0x29,0xC8,0xF7,0x12},{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80},{0x02,0x08,0x06,0x04,0x01,0x03,0x05,0x07}},
553 {{0x17,0xE8,0x97,0xF0,0x99,0xB6,0x79,0x31},{0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00},{0x02,0x0C,0x06,0x08,0x01,0x03,0x05,0x07}},
554 {{0x49,0xA4,0xF0,0x8F,0x5F,0x96,0x83,0x16},{0x00,0x00,0x00,0x00,0x00,0x00,0x02,0x00},{0x02,0x14,0x06,0x08,0x01,0x03,0x05,0x07}},
555 {{0x60,0xF5,0x7E,0x54,0xAA,0x41,0x83,0xD4},{0x00,0x00,0x00,0x00,0x00,0x00,0x04,0x00},{0x02,0x24,0x06,0x08,0x01,0x03,0x05,0x07}},
556 {{0x1D,0xF6,0x3B,0x6B,0x85,0x55,0xF0,0x4B},{0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00},{0x02,0x44,0x06,0x08,0x01,0x03,0x05,0x07}},
557 {{0x1F,0xDC,0x95,0x1A,0xEA,0x6B,0x4B,0xB4},{0x00,0x00,0x00,0x00,0x00,0x00,0x10,0x00},{0x02,0x04,0x08,0x06,0x01,0x03,0x05,0x07}},
558 {{0xEC,0x93,0x72,0xF0,0x3B,0xA9,0xF5,0x0B},{0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x00},{0x02,0x04,0x0A,0x08,0x01,0x03,0x05,0x07}},
559 {{0xDE,0x57,0x5C,0xBE,0x2D,0x55,0x03,0x12},{0x00,0x00,0x00,0x00,0x00,0x00,0x40,0x00},{0x02,0x04,0x0E,0x08,0x01,0x03,0x05,0x07}},
560 {{0x1E,0xD2,0xB5,0xCE,0x90,0xC9,0xC1,0xCC},{0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x00},{0x02,0x04,0x16,0x08,0x01,0x03,0x05,0x07}},
561 {{0xD8,0x65,0x96,0x4E,0xE7,0x74,0x99,0xB8},{0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00},{0x02,0x04,0x26,0x08,0x01,0x03,0x05,0x07}},
562 {{0xE3,0x7A,0x29,0x83,0x31,0xD5,0x3A,0x54},{0x00,0x00,0x00,0x00,0x00,0x02,0x00,0x00},{0x02,0x04,0x46,0x08,0x01,0x03,0x05,0x07}},
563 {{0x3A,0xB5,0x1A,0x34,0x34,0x25,0x12,0xF0},{0x00,0x00,0x00,0x00,0x00,0x04,0x00,0x00},{0x02,0x04,0x06,0x0A,0x01,0x03,0x05,0x07}},
564 {{0xF2,0x88,0xEE,0x6F,0x70,0x6F,0xC2,0x52},{0x00,0x00,0x00,0x00,0x00,0x08,0x00,0x00},{0x02,0x04,0x06,0x0C,0x01,0x03,0x05,0x07}},
565 {{0x76,0xEF,0xEB,0x80,0x52,0x43,0x83,0x57},{0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x00},{0x02,0x04,0x06,0x10,0x01,0x03,0x05,0x07}},
566 {{0x1C,0x09,0x8E,0x3B,0x23,0x23,0x52,0xB5},{0x00,0x00,0x00,0x00,0x00,0x20,0x00,0x00},{0x02,0x04,0x06,0x18,0x01,0x03,0x05,0x07}},
567 {{0xA9,0x13,0xA2,0xBE,0xCF,0x1A,0xC4,0x9A},{0x00,0x00,0x00,0x00,0x00,0x40,0x00,0x00},{0x02,0x04,0x06,0x28,0x01,0x03,0x05,0x07}},
568 {{0x25,0x56,0x4B,0xB0,0xC8,0x2A,0xD4,0x27},{0x00,0x00,0x00,0x00,0x00,0x80,0x00,0x00},{0x02,0x04,0x06,0x48,0x01,0x03,0x05,0x07}},
569 {{0xB1,0x04,0x57,0x3F,0xA7,0x16,0x62,0xD4},{0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x03,0x01,0x05,0x07}},
570 {{0x45,0x46,0xED,0xCC,0xE7,0xD3,0x8E,0xA3},{0x00,0x00,0x00,0x00,0x02,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x05,0x03,0x01,0x07}},
571 {{0x22,0x6D,0xB5,0x35,0xE0,0x5A,0xE0,0x90},{0x00,0x00,0x00,0x00,0x04,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x09,0x03,0x05,0x07}},
572 {{0xB8,0xF5,0xE5,0x44,0xC5,0x98,0x4A,0xBD},{0x00,0x00,0x00,0x00,0x08,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x11,0x03,0x05,0x07}},
573 {{0xAC,0x78,0x0A,0x23,0x9E,0xF6,0xBC,0xA0},{0x00,0x00,0x00,0x00,0x10,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x21,0x03,0x05,0x07}},
574 {{0x46,0x6B,0x2D,0x70,0x41,0x17,0xBF,0x3D},{0x00,0x00,0x00,0x00,0x20,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x41,0x03,0x05,0x07}},
575 {{0x64,0x44,0x24,0x71,0xA2,0x56,0xDF,0xB5},{0x00,0x00,0x00,0x00,0x40,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x05,0x03,0x07}},
576 {{0xC4,0x00,0x52,0x24,0xA2,0xD6,0x16,0x7A},{0x00,0x00,0x00,0x00,0x80,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x07,0x05,0x03}},
577 {{0xD8,0x4A,0x80,0x1E,0x95,0x5B,0x70,0xC4},{0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x0B,0x05,0x07}},
578 {{0x08,0x56,0x6E,0xB5,0x64,0xD6,0x47,0x4E},{0x00,0x00,0x00,0x02,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x13,0x05,0x07}},
579 {{0x41,0x6F,0xBA,0xA4,0xEB,0xAE,0xA0,0x55},{0x00,0x00,0x00,0x04,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x23,0x05,0x07}},
580 {{0x62,0x9D,0xDE,0x72,0x84,0x4A,0x53,0xD5},{0x00,0x00,0x00,0x08,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x43,0x05,0x07}},
581 {{0x39,0xD3,0x2B,0x66,0xB8,0x08,0x40,0x2E},{0x00,0x00,0x00,0x10,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x07,0x05}},
582 {{0xAF,0x67,0xA9,0x18,0x57,0x21,0xAF,0x8D},{0x00,0x00,0x00,0x20,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x09,0x07}},
583 {{0x34,0xBC,0x9D,0xBC,0xC4,0xC2,0x3B,0xC8},{0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x0D,0x07}},
584 {{0xB6,0x50,0xF9,0x81,0xF6,0xBF,0x90,0x3C},{0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x15,0x07}},
585 {{0x71,0x41,0x93,0xA1,0x59,0x81,0xA5,0x52},{0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x25,0x07}},
586 {{0x6B,0x00,0xBD,0x74,0x1C,0x3C,0xE0,0x1A},{0x00,0x00,0x02,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x45,0x07}},
587 {{0x76,0xFD,0x0B,0xD0,0x41,0xD2,0x82,0x5D},{0x00,0x00,0x04,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0x09}},
588 {{0xC6,0x3A,0x1C,0x25,0x63,0x5A,0x2F,0x0E},{0x00,0x00,0x08,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0x0B}},
589 {{0xD9,0x0E,0xD7,0x30,0xE2,0xAD,0xA9,0x87},{0x00,0x00,0x10,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0x0F}},
590 {{0x6B,0x81,0xC6,0xD1,0x05,0x09,0x87,0x1E},{0x00,0x00,0x20,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0x17}},
591 {{0xB4,0xA7,0x1E,0x02,0x54,0x37,0x43,0x35},{0x00,0x00,0x40,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0x27}},
592 {{0x45,0x14,0x7C,0x7F,0xE0,0xDE,0x09,0x65},{0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0x47}},
593 {{0x78,0xB0,0xF5,0x20,0x8B,0x7D,0xF3,0xDD},{0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00},{0xFE,0x04,0x06,0x08,0x01,0x03,0x05,0x07}},
594 {{0x88,0xB3,0x3C,0xE1,0xF7,0x87,0x42,0xA1},{0x00,0x02,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0xFC,0x06,0x08,0x01,0x03,0x05,0x07}},
595 {{0x11,0x2F,0xB2,0xF7,0xE2,0xB2,0x4F,0x6E},{0x00,0x04,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0xFA,0x08,0x01,0x03,0x05,0x07}},
596 {{0x25,0x56,0x4E,0xC6,0xEB,0x2D,0x74,0x5B},{0x00,0x08,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0xF8,0x01,0x03,0x05,0x07}},
597 {{0x7E,0x98,0x37,0xF9,0x80,0x8F,0x09,0x82},{0x00,0x10,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0xFF,0x03,0x05,0x07}},
598 {{0xF9,0xB5,0x62,0x3B,0xD8,0x7B,0x3C,0x3F},{0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0xFD,0x05,0x07}},
599 {{0x29,0xC5,0x2B,0xFA,0xD1,0xFC,0x5C,0xC7},{0x00,0x40,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0xFB,0x07}},
600 {{0xC1,0xA3,0x09,0x71,0xBD,0x8E,0xAF,0x2F},{0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x06,0x08,0x01,0x03,0x05,0xF9}},
601 {{0xB6,0xDD,0xD1,0xAD,0xAA,0x15,0x6F,0x29},{0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x01,0x03,0x05,0x02,0x07,0x04,0x06,0x08}},
602 {{0x65,0x34,0x03,0x19,0x17,0xB3,0xA3,0x96},{0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x01,0x06,0x08,0x03,0x05,0x07}},
603 {{0xF9,0x38,0x43,0x56,0x52,0xE5,0xB1,0xA9},{0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x01,0x02,0x04,0x06,0x08,0x03,0x05,0x07}},
604
605 {{0xA4,0xA0,0xAF,0xDA,0x48,0xB0,0xA1,0x10},{0x08,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x01,0x02,0x04,0x06,0x03,0x08,0x05,0x07}},
606 {{0x55,0x15,0x8A,0x0D,0x48,0x29,0x01,0xD8},{0x10,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x02,0x04,0x01,0x06,0x03,0x05,0x08,0x07}},
607 {{0xC4,0x81,0x96,0x7D,0xA3,0xB7,0x73,0x50},{0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x01,0x02,0x03,0x05,0x04,0x06,0x08,0x07}},
608 {{0x36,0x73,0xDF,0xC1,0x1B,0x98,0xA8,0x1D},{0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x01,0x02,0x03,0x04,0x05,0x06,0x08,0x07}},
609 {{0xCE,0xE0,0xB3,0x1B,0x41,0xEB,0x15,0x12},{0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00},{0x01,0x02,0x03,0x04,0x06,0x05,0x08,0x07}},
610 {{0},{0},{0}}
611 };
612
613
614 int testKeyDiversificationWithMasterkeyTestcases()
615 {
616
617 int error = 0;
618 int i;
619
620 uint8_t empty[8]={0};
621 prnlog("[+} Testing encryption/decryption");
622
623 for (i = 0; memcmp(testcases+i,empty,8) ; i++) {
624 error += testDES(testcases[i],ctx_enc, ctx_dec);
625 }
626 if(error)
627 {
628 prnlog("[+] %d errors occurred (%d testcases)", error, i);
629 }else
630 {
631 prnlog("[+] Hashing seems to work (%d testcases)", i);
632 }
633 return error;
634 }
635
636
637 void print64bits(char*name, uint64_t val)
638 {
639 printf("%s%08x%08x\n",name,(uint32_t) (val >> 32) ,(uint32_t) (val & 0xFFFFFFFF));
640 }
641
642 uint64_t testCryptedCSN(uint64_t crypted_csn, uint64_t expected)
643 {
644 int retval = 0;
645 uint8_t result[8] = {0};
646 if(debug_print) prnlog("debug_print %d", debug_print);
647 if(debug_print) print64bits(" {csn} ", crypted_csn );
648
649 uint64_t crypted_csn_swapped = swapZvalues(crypted_csn);
650
651 if(debug_print) print64bits(" {csn-revz} ", crypted_csn_swapped);
652
653 hash0(crypted_csn, result);
654 uint64_t resultbyte = x_bytes_to_num(result,8 );
655 if(debug_print) print64bits(" hash0 " , resultbyte );
656
657 if(resultbyte != expected )
658 {
659
660 if(debug_print) {
661 prnlog("\n[+] FAIL!");
662 print64bits(" expected " , expected );
663 }
664 retval = 1;
665
666 }else
667 {
668 if(debug_print) prnlog(" [OK]");
669 }
670 return retval;
671 }
672
673 int testDES2(uint64_t csn, uint64_t expected)
674 {
675 uint8_t result[8] = {0};
676 uint8_t input[8] = {0};
677
678 print64bits(" csn ", csn);
679 x_num_to_bytes(csn, 8,input);
680
681 des_crypt_ecb(&ctx_enc,input, result);
682
683 uint64_t crypt_csn = x_bytes_to_num(result, 8);
684 print64bits(" {csn} ", crypt_csn );
685 print64bits(" expected ", expected );
686
687 if( expected == crypt_csn )
688 {
689 prnlog("[+] OK");
690 return 0;
691 }else
692 {
693 return 1;
694 }
695 }
696
697 /**
698 * These testcases come from http://www.proxmark.org/forum/viewtopic.php?pid=10977#p10977
699 * @brief doTestsWithKnownInputs
700 * @return
701 */
702 int doTestsWithKnownInputs()
703 {
704
705 // KSel from http://www.proxmark.org/forum/viewtopic.php?pid=10977#p10977
706 int errors = 0;
707 prnlog("[+] Testing DES encryption");
708 // uint8_t key[8] = {0x6c,0x8d,0x44,0xf9,0x2a,0x2d,0x01,0xbf};
709 prnlog("[+] Testing foo");
710 uint8_t key[8] = {0x6c,0x8d,0x44,0xf9,0x2a,0x2d,0x01,0xbf};
711
712 des_setkey_enc( &ctx_enc, key);
713 testDES2(0xbbbbaaaabbbbeeee,0xd6ad3ca619659e6b);
714
715 prnlog("[+] Testing hashing algorithm");
716
717 errors += testCryptedCSN(0x0102030405060708,0x0bdd6512073c460a);
718 errors += testCryptedCSN(0x1020304050607080,0x0208211405f3381f);
719 errors += testCryptedCSN(0x1122334455667788,0x2bee256d40ac1f3a);
720 errors += testCryptedCSN(0xabcdabcdabcdabcd,0xa91c9ec66f7da592);
721 errors += testCryptedCSN(0xbcdabcdabcdabcda,0x79ca5796a474e19b);
722 errors += testCryptedCSN(0xcdabcdabcdabcdab,0xa8901b9f7ec76da4);
723 errors += testCryptedCSN(0xdabcdabcdabcdabc,0x357aa8e0979a5b8d);
724 errors += testCryptedCSN(0x21ba6565071f9299,0x34e80f88d5cf39ea);
725 errors += testCryptedCSN(0x14e2adfc5bb7e134,0x6ac90c6508bd9ea3);
726
727 if(errors)
728 {
729 prnlog("[+] %d errors occurred (9 testcases)", errors);
730 }else
731 {
732 prnlog("[+] Hashing seems to work (9 testcases)" );
733 }
734 return errors;
735 }
736
737 int readKeyFile(uint8_t key[8])
738 {
739 FILE *f;
740 int retval = 1;
741 f = fopen("iclass_key.bin", "rb");
742 if (!f)
743 return retval;
744
745 if (fread(key, sizeof(uint8_t), 8, f) == 8) {
746 retval = 0;
747 }
748 fclose(f);
749 return retval;
750 }
751
752 int doKeyTests(uint8_t debuglevel)
753 {
754 debug_print = debuglevel;
755
756 prnlog("[+] Checking if the master key is present (iclass_key.bin)...");
757 uint8_t key[8] = {0};
758 if(readKeyFile(key))
759 {
760 prnlog("[+] Master key not present, will not be able to do all testcases");
761 }else
762 {
763
764 //Test if it's the right key...
765 uint8_t i;
766 uint8_t j = 0;
767 for(i =0 ; i < sizeof(key) ; i++)
768 j += key[i];
769
770 if(j != 185)
771 {
772 prnlog("[+] A key was loaded, but it does not seem to be the correct one. Aborting these tests");
773 }else
774 {
775 prnlog("[+] Key present");
776
777 prnlog("[+] Checking key parity...");
778 des_checkParity(key);
779 des_setkey_enc( &ctx_enc, key);
780 des_setkey_dec( &ctx_dec, key);
781 // Test hashing functions
782 prnlog("[+] The following tests require the correct 8-byte master key");
783 testKeyDiversificationWithMasterkeyTestcases();
784 }
785 }
786 prnlog("[+] Testing key diversification with non-sensitive keys...");
787 doTestsWithKnownInputs();
788 return 0;
789 }
790
791 /**
792
793 void checkParity2(uint8_t* key)
794 {
795
796 uint8_t stored_parity = key[7];
797 printf("Parity byte: 0x%02x\n", stored_parity);
798 int i;
799 int byte;
800 int fails =0;
801 BitstreamIn bits = {key, 56, 0};
802
803 bool parity = 0;
804
805 for(i =0 ; i < 56; i++)
806 {
807
808 if ( i > 0 && i % 7 == 0)
809 {
810 parity = !parity;
811 bool pbit = stored_parity & (0x80 >> (byte));
812 if(parity != pbit)
813 {
814 printf("parity2 fail byte %d, should be %d, was %d\n", (i / 7), parity, pbit);
815 fails++;
816 }
817 parity =0 ;
818 byte = i / 7;
819 }
820 parity = parity ^ headBit(&bits);
821 }
822 if(fails)
823 {
824 printf("parity2 fails: %d\n", fails);
825 }else
826 {
827 printf("Key syntax is with parity bits grouped in the last byte!\n");
828 }
829 }
830 void modifyKey_put_parity_last(uint8_t * key, uint8_t* output)
831 {
832 uint8_t paritybits = 0;
833 bool parity =0;
834 BitstreamOut out = { output, 0,0};
835 unsigned int bbyte, bbit;
836 for(bbyte=0; bbyte <8 ; bbyte++ )
837 {
838 for(bbit =0 ; bbit< 7 ; bbit++)
839 {
840 bool bit = *(key+bbyte) & (1 << (7-bbit));
841 pushBit(&out,bit);
842 parity ^= bit;
843 }
844 bool paritybit = *(key+bbyte) & 1;
845 paritybits |= paritybit << (7-bbyte);
846 parity = 0;
847
848 }
849 output[7] = paritybits;
850 printf("Parity byte: %02x\n", paritybits);
851 }
852
853 * @brief Modifies a key with parity bits last, so that it is formed with parity
854 * bits inside each byte
855 * @param key
856 * @param output
857
858 void modifyKey_put_parity_allover(uint8_t * key, uint8_t* output)
859 {
860 bool parity =0;
861 BitstreamOut out = { output, 0,0};
862 BitstreamIn in = {key, 0,0};
863 unsigned int bbyte, bbit;
864 for(bbit =0 ; bbit < 56 ; bbit++)
865 {
866
867 if( bbit > 0 && bbit % 7 == 0)
868 {
869 pushBit(&out,!parity);
870 parity = 0;
871 }
872 bool bit = headBit(&in);
873 pushBit(&out,bit );
874 parity ^= bit;
875
876 }
877 pushBit(&out, !parity);
878
879
880 if( des_key_check_key_parity(output))
881 {
882 printf("modifyKey_put_parity_allover fail, DES key invalid parity!");
883 }
884
885 }
886
887 */
888
889
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