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20f9a2a1 M |
1 | //----------------------------------------------------------------------------- |
2 | // Copyright (C) 2010 iZsh <izsh at fail0verflow.com> | |
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 | // utilities | |
9 | //----------------------------------------------------------------------------- | |
10 | ||
11 | #include "util.h" | |
c805748f | 12 | #include "proxmark3.h" |
bf32dd92 | 13 | #define MAX_BIN_BREAK_LENGTH (3072+384+1) |
534983d7 | 14 | |
cb64309e | 15 | #ifndef _WIN32 |
873014de M |
16 | #include <termios.h> |
17 | #include <sys/ioctl.h> | |
79544b28 | 18 | |
f397b5cc M |
19 | int ukbhit(void) |
20 | { | |
21 | int cnt = 0; | |
22 | int error; | |
23 | static struct termios Otty, Ntty; | |
24 | ||
d04b71c1 | 25 | if ( tcgetattr( 0, &Otty) == -1) return -1; |
f397b5cc M |
26 | Ntty = Otty; |
27 | ||
d04b71c1 | 28 | Ntty.c_iflag = 0; /* input mode */ |
29 | Ntty.c_oflag = 0; /* output mode */ | |
30 | Ntty.c_lflag &= ~ICANON; /* raw mode */ | |
31 | Ntty.c_cc[VMIN] = CMIN; /* minimum time to wait */ | |
32 | Ntty.c_cc[VTIME] = CTIME; /* minimum characters to wait for */ | |
f397b5cc M |
33 | |
34 | if (0 == (error = tcsetattr(0, TCSANOW, &Ntty))) { | |
35 | error += ioctl(0, FIONREAD, &cnt); | |
36 | error += tcsetattr(0, TCSANOW, &Otty); | |
37 | } | |
38 | ||
39 | return ( error == 0 ? cnt : -1 ); | |
40 | } | |
41 | ||
42 | #else | |
43 | #include <conio.h> | |
44 | int ukbhit(void) { | |
45 | return kbhit(); | |
46 | } | |
47 | #endif | |
48 | ||
55acbb2a | 49 | // log files functions |
b915fda3 | 50 | void AddLogLine(char *file, char *extData, char *c) { |
c805748f | 51 | FILE *f = NULL; |
b915fda3 | 52 | char filename[FILE_PATH_SIZE] = {0x00}; |
53 | int len = 0; | |
54 | ||
55 | len = strlen(file); | |
56 | if (len > FILE_PATH_SIZE) len = FILE_PATH_SIZE; | |
57 | memcpy(filename, file, len); | |
58 | ||
c805748f | 59 | f = fopen(filename, "a"); |
60 | if (!f) { | |
b915fda3 | 61 | printf("Could not append log file %s", filename); |
55acbb2a M |
62 | return; |
63 | } | |
64 | ||
c805748f | 65 | fprintf(f, "%s", extData); |
66 | fprintf(f, "%s\n", c); | |
67 | fflush(f); | |
68 | fclose(f); | |
55acbb2a M |
69 | } |
70 | ||
71 | void AddLogHex(char *fileName, char *extData, const uint8_t * data, const size_t len){ | |
72 | AddLogLine(fileName, extData, sprint_hex(data, len)); | |
73 | } | |
74 | ||
75 | void AddLogUint64(char *fileName, char *extData, const uint64_t data) { | |
c805748f | 76 | char buf[20] = {0}; |
77 | memset(buf, 0x00, sizeof(buf)); | |
78 | //sprintf(buf, "%X%X", (unsigned int)((data & 0xFFFFFFFF00000000) >> 32), (unsigned int)(data & 0xFFFFFFFF)); | |
79 | sprintf(buf, "%012"llx"", data); | |
55acbb2a M |
80 | AddLogLine(fileName, extData, buf); |
81 | } | |
82 | ||
83 | void AddLogCurrentDT(char *fileName) { | |
c805748f | 84 | char buf[20]; |
85 | memset(buf, 0x00, sizeof(buf)); | |
55acbb2a | 86 | struct tm *curTime; |
55acbb2a M |
87 | time_t now = time(0); |
88 | curTime = gmtime(&now); | |
c805748f | 89 | strftime (buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", curTime); |
90 | AddLogLine(fileName, "\nanticollision: ", buf); | |
55acbb2a M |
91 | } |
92 | ||
c805748f | 93 | void FillFileNameByUID(char *fileName, uint8_t *uid, char *ext, int byteCount) { |
94 | if ( fileName == NULL || uid == NULL || ext == NULL ){ | |
95 | printf("error: parameter is NULL\n"); | |
96 | return; | |
97 | } | |
55acbb2a | 98 | char * fnameptr = fileName; |
c805748f | 99 | memset(fileName, 0x00, FILE_PATH_SIZE); |
55acbb2a | 100 | |
e0c635d1 | 101 | for (int j = 0; j < byteCount; j++, fnameptr += 2) |
c805748f | 102 | sprintf(fnameptr, "%02X", uid[j]); |
55acbb2a | 103 | sprintf(fnameptr, "%s", ext); |
55acbb2a M |
104 | } |
105 | ||
106 | // printing and converting functions | |
9827020a | 107 | void print_hex(const uint8_t * data, const size_t len) { |
534983d7 | 108 | size_t i; |
9827020a | 109 | for (i=0; i < len; ++i) |
534983d7 | 110 | printf("%02x ", data[i]); |
9827020a | 111 | printf("\n"); |
112 | } | |
0d2c5909 | 113 | |
9827020a | 114 | void print_hex_break(const uint8_t *data, const size_t len, uint8_t breaks) { |
a1689f41 | 115 | |
116 | int rownum = 0; | |
117 | printf("[%02d] | ", rownum); | |
118 | for (int i = 0; i < len; ++i) { | |
534983d7 | 119 | |
9827020a | 120 | printf("%02X ", data[i]); |
121 | ||
122 | // check if a line break is needed | |
a1689f41 | 123 | if ( breaks > 0 && !((i+1) % breaks) && (i+1 < len) ) { |
124 | ++rownum; | |
125 | printf("\n[%02d] | ", rownum); | |
126 | } | |
9827020a | 127 | } |
534983d7 | 128 | printf("\n"); |
129 | } | |
130 | ||
334cc089 | 131 | char *sprint_hex(const uint8_t *data, const size_t len) { |
b915fda3 | 132 | |
133 | int maxLen = ( len > 1024/3) ? 1024/3 : len; | |
534983d7 | 134 | static char buf[1024]; |
334cc089 | 135 | memset(buf, 0x00, 1024); |
534983d7 | 136 | char * tmp = buf; |
137 | size_t i; | |
138 | ||
b915fda3 | 139 | for (i=0; i < maxLen; ++i, tmp += 3) |
334cc089 | 140 | sprintf(tmp, "%02X ", data[i]); |
534983d7 | 141 | return buf; |
142 | } | |
f89c7050 | 143 | |
2767fc02 | 144 | char *sprint_bin_break(const uint8_t *data, const size_t len, const uint8_t breaks) { |
581b31fb | 145 | |
bf32dd92 | 146 | // make sure we don't go beyond our char array memory |
581b31fb | 147 | size_t in_index = 0, out_index = 0; |
148 | int max_len; | |
0c97a456 | 149 | if (breaks==0) |
150 | max_len = ( len > MAX_BIN_BREAK_LENGTH ) ? MAX_BIN_BREAK_LENGTH : len; | |
151 | else | |
152 | max_len = ( len+(len/breaks) > MAX_BIN_BREAK_LENGTH ) ? MAX_BIN_BREAK_LENGTH : len+(len/breaks); | |
153 | ||
bf32dd92 | 154 | static char buf[MAX_BIN_BREAK_LENGTH]; // 3072 + end of line characters if broken at 8 bits |
155 | //clear memory | |
156 | memset(buf, 0x00, sizeof(buf)); | |
2767fc02 | 157 | char *tmp = buf; |
79544b28 | 158 | |
bf32dd92 | 159 | // loop through the out_index to make sure we don't go too far |
581b31fb | 160 | for (out_index=0; out_index < max_len-2; out_index++) { |
bf32dd92 | 161 | // set character |
05164399 | 162 | sprintf(tmp++, "%u", (unsigned int) data[in_index]); |
9332b857 | 163 | // check if a line break is needed and we have room to print it in our array |
bf32dd92 | 164 | if ( (breaks > 0) && !((in_index+1) % breaks) && (out_index+1 != max_len) ) { |
165 | // increment and print line break | |
166 | out_index++; | |
2767fc02 | 167 | sprintf(tmp++, "%s","\n"); |
581b31fb | 168 | } |
bf32dd92 | 169 | in_index++; |
170 | } | |
581b31fb | 171 | // last char. |
172 | sprintf(tmp++, "%u", (unsigned int) data[in_index]); | |
79544b28 | 173 | return buf; |
174 | } | |
175 | ||
2767fc02 | 176 | char *sprint_bin(const uint8_t *data, const size_t len) { |
177 | return sprint_bin_break(data, len, 0); | |
178 | } | |
0c97a456 | 179 | |
180 | char *sprint_hex_ascii(const uint8_t *data, const size_t len) { | |
181 | static char buf[1024]; | |
508b37ba | 182 | char *tmp = buf; |
9827020a | 183 | memset(buf, 0x00, 1024); |
184 | size_t max_len = (len > 1010) ? 1010 : len; | |
185 | sprintf(tmp, "%s| %s", sprint_hex(data, max_len) , data); | |
0c97a456 | 186 | return buf; |
187 | } | |
0d2c5909 | 188 | |
1f1d974f | 189 | void num_to_bytes(uint64_t n, size_t len, uint8_t* dest) { |
f89c7050 M |
190 | while (len--) { |
191 | dest[len] = (uint8_t) n; | |
192 | n >>= 8; | |
193 | } | |
194 | } | |
195 | ||
1f1d974f | 196 | uint64_t bytes_to_num(uint8_t* src, size_t len) { |
f89c7050 | 197 | uint64_t num = 0; |
1f1d974f | 198 | while (len--) { |
f89c7050 M |
199 | num = (num << 8) | (*src); |
200 | src++; | |
201 | } | |
202 | return num; | |
203 | } | |
f397b5cc | 204 | |
0d2c5909 | 205 | // takes a number (uint64_t) and creates a binarray in dest. |
206 | void num_to_bytebits(uint64_t n, size_t len, uint8_t *dest) { | |
a126332a | 207 | while (len--) { |
208 | dest[len] = n & 1; | |
209 | n >>= 1; | |
210 | } | |
211 | } | |
1f1d974f | 212 | |
0d2c5909 | 213 | //least significant bit first |
c805748f | 214 | void num_to_bytebitsLSBF(uint64_t n, size_t len, uint8_t *dest) { |
0d2c5909 | 215 | for(int i = 0 ; i < len ; ++i) { |
216 | dest[i] = n & 1; | |
217 | n >>= 1; | |
218 | } | |
219 | } | |
220 | ||
e1c88b09 | 221 | // aa,bb,cc,dd,ee,ff,gg,hh, ii,jj,kk,ll,mm,nn,oo,pp |
222 | // to | |
223 | // hh,gg,ff,ee,dd,cc,bb,aa, pp,oo,nn,mm,ll,kk,jj,ii | |
224 | // up to 64 bytes or 512 bits | |
224e8c1a | 225 | uint8_t *SwapEndian64(const uint8_t *src, const size_t len, const uint8_t blockSize){ |
f4d0ffd1 | 226 | uint8_t buf[64]; |
224e8c1a | 227 | memset(buf, 0x00, 64); |
228 | uint8_t *tmp = buf; | |
229 | for (uint8_t block=0; block < (uint8_t)(len/blockSize); block++){ | |
230 | for (size_t i = 0; i < blockSize; i++){ | |
231 | tmp[i+(blockSize*block)] = src[(blockSize-1-i)+(blockSize*block)]; | |
e1c88b09 | 232 | } |
233 | } | |
224e8c1a | 234 | return tmp; |
e1c88b09 | 235 | } |
236 | ||
0d2c5909 | 237 | // takes a uint8_t src array, for len items and reverses the byte order in blocksizes (8,16,32,64), |
238 | // returns: the dest array contains the reordered src array. | |
f4d0ffd1 | 239 | void SwapEndian64ex(const uint8_t *src, const size_t len, const uint8_t blockSize, uint8_t *dest){ |
240 | for (uint8_t block=0; block < (uint8_t)(len/blockSize); block++){ | |
241 | for (size_t i = 0; i < blockSize; i++){ | |
242 | dest[i+(blockSize*block)] = src[(blockSize-1-i)+(blockSize*block)]; | |
243 | } | |
244 | } | |
245 | } | |
246 | ||
9ca155ba M |
247 | // ------------------------------------------------------------------------- |
248 | // string parameters lib | |
249 | // ------------------------------------------------------------------------- | |
250 | ||
f397b5cc M |
251 | // ------------------------------------------------------------------------- |
252 | // line - param line | |
253 | // bg, en - symbol numbers in param line of beginning an ending parameter | |
254 | // paramnum - param number (from 0) | |
255 | // ------------------------------------------------------------------------- | |
256 | int param_getptr(const char *line, int *bg, int *en, int paramnum) | |
257 | { | |
258 | int i; | |
259 | int len = strlen(line); | |
260 | ||
261 | *bg = 0; | |
262 | *en = 0; | |
263 | ||
264 | // skip spaces | |
265 | while (line[*bg] ==' ' || line[*bg]=='\t') (*bg)++; | |
266 | if (*bg >= len) { | |
267 | return 1; | |
268 | } | |
269 | ||
270 | for (i = 0; i < paramnum; i++) { | |
271 | while (line[*bg]!=' ' && line[*bg]!='\t' && line[*bg] != '\0') (*bg)++; | |
272 | while (line[*bg]==' ' || line[*bg]=='\t') (*bg)++; | |
273 | ||
274 | if (line[*bg] == '\0') return 1; | |
275 | } | |
276 | ||
277 | *en = *bg; | |
278 | while (line[*en] != ' ' && line[*en] != '\t' && line[*en] != '\0') (*en)++; | |
279 | ||
280 | (*en)--; | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
31abe49f | 285 | |
f397b5cc M |
286 | char param_getchar(const char *line, int paramnum) |
287 | { | |
288 | int bg, en; | |
289 | ||
290 | if (param_getptr(line, &bg, &en, paramnum)) return 0x00; | |
291 | ||
292 | return line[bg]; | |
293 | } | |
294 | ||
295 | uint8_t param_get8(const char *line, int paramnum) | |
296 | { | |
60e86577 | 297 | return param_get8ex(line, paramnum, 0, 10); |
f397b5cc M |
298 | } |
299 | ||
f6d9fb17 | 300 | /** |
31abe49f | 301 | * @brief Reads a decimal integer (actually, 0-254, not 255) |
f6d9fb17 MHS |
302 | * @param line |
303 | * @param paramnum | |
31abe49f | 304 | * @return -1 if error |
f6d9fb17 MHS |
305 | */ |
306 | uint8_t param_getdec(const char *line, int paramnum, uint8_t *destination) | |
307 | { | |
31abe49f | 308 | uint8_t val = param_get8ex(line, paramnum, 255, 10); |
31abe49f | 309 | if( (int8_t) val == -1) return 1; |
f6d9fb17 MHS |
310 | (*destination) = val; |
311 | return 0; | |
312 | } | |
313 | /** | |
314 | * @brief Checks if param is decimal | |
315 | * @param line | |
316 | * @param paramnum | |
317 | * @return | |
318 | */ | |
319 | uint8_t param_isdec(const char *line, int paramnum) | |
320 | { | |
321 | int bg, en; | |
322 | //TODO, check more thorougly | |
323 | if (!param_getptr(line, &bg, &en, paramnum)) return 1; | |
324 | // return strtoul(&line[bg], NULL, 10) & 0xff; | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
f397b5cc M |
329 | uint8_t param_get8ex(const char *line, int paramnum, int deflt, int base) |
330 | { | |
331 | int bg, en; | |
332 | ||
333 | if (!param_getptr(line, &bg, &en, paramnum)) | |
6c6d1ac1 | 334 | return strtoul(&line[bg], NULL, base) & 0xff; |
f397b5cc M |
335 | else |
336 | return deflt; | |
337 | } | |
338 | ||
339 | uint32_t param_get32ex(const char *line, int paramnum, int deflt, int base) | |
340 | { | |
341 | int bg, en; | |
342 | ||
343 | if (!param_getptr(line, &bg, &en, paramnum)) | |
6c6d1ac1 | 344 | return strtoul(&line[bg], NULL, base); |
f397b5cc M |
345 | else |
346 | return deflt; | |
347 | } | |
348 | ||
349 | uint64_t param_get64ex(const char *line, int paramnum, int deflt, int base) | |
350 | { | |
351 | int bg, en; | |
352 | ||
353 | if (!param_getptr(line, &bg, &en, paramnum)) | |
6c6d1ac1 | 354 | return strtoull(&line[bg], NULL, base); |
f397b5cc M |
355 | else |
356 | return deflt; | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | int param_gethex(const char *line, int paramnum, uint8_t * data, int hexcnt) | |
362 | { | |
363 | int bg, en, temp, i; | |
364 | ||
508b37ba | 365 | if (hexcnt & 1) return 1; |
f397b5cc M |
366 | |
367 | if (param_getptr(line, &bg, &en, paramnum)) return 1; | |
368 | ||
508b37ba | 369 | if (en - bg + 1 != hexcnt) return 1; |
f397b5cc M |
370 | |
371 | for(i = 0; i < hexcnt; i += 2) { | |
372 | if (!(isxdigit(line[bg + i]) && isxdigit(line[bg + i + 1])) ) return 1; | |
373 | ||
374 | sscanf((char[]){line[bg + i], line[bg + i + 1], 0}, "%X", &temp); | |
375 | data[i / 2] = temp & 0xff; | |
376 | } | |
377 | ||
378 | return 0; | |
379 | } | |
e98572a1 | 380 | int param_gethex_ex(const char *line, int paramnum, uint8_t * data, int *hexcnt) |
381 | { | |
382 | int bg, en, temp, i; | |
383 | ||
384 | //if (hexcnt % 2) | |
385 | // return 1; | |
386 | ||
387 | if (param_getptr(line, &bg, &en, paramnum)) return 1; | |
388 | ||
389 | *hexcnt = en - bg + 1; | |
390 | if (*hexcnt % 2) //error if not complete hex bytes | |
391 | return 1; | |
aea4d766 | 392 | |
e98572a1 | 393 | for(i = 0; i < *hexcnt; i += 2) { |
3bc7b13d | 394 | if (!(isxdigit(line[bg + i]) && isxdigit(line[bg + i + 1])) ) return 1; |
e98572a1 | 395 | |
396 | sscanf((char[]){line[bg + i], line[bg + i + 1], 0}, "%X", &temp); | |
397 | data[i / 2] = temp & 0xff; | |
398 | } | |
399 | ||
400 | return 0; | |
401 | } | |
aea4d766 | 402 | int param_getstr(const char *line, int paramnum, char * str) |
403 | { | |
404 | int bg, en; | |
405 | ||
406 | if (param_getptr(line, &bg, &en, paramnum)) return 0; | |
407 | ||
408 | memcpy(str, line + bg, en - bg + 1); | |
409 | str[en - bg + 1] = 0; | |
410 | ||
411 | return en - bg + 1; | |
412 | } | |
79544b28 | 413 | |
414 | /* | |
415 | The following methods comes from Rfidler sourcecode. | |
416 | https://github.com/ApertureLabsLtd/RFIDler/blob/master/firmware/Pic32/RFIDler.X/src/ | |
417 | */ | |
418 | ||
419 | // convert hex to sequence of 0/1 bit values | |
420 | // returns number of bits converted | |
421 | int hextobinarray(char *target, char *source) | |
422 | { | |
423 | int length, i, count= 0; | |
424 | char x; | |
425 | ||
426 | length = strlen(source); | |
427 | // process 4 bits (1 hex digit) at a time | |
428 | while(length--) | |
429 | { | |
430 | x= *(source++); | |
431 | // capitalize | |
432 | if (x >= 'a' && x <= 'f') | |
433 | x -= 32; | |
434 | // convert to numeric value | |
435 | if (x >= '0' && x <= '9') | |
436 | x -= '0'; | |
437 | else if (x >= 'A' && x <= 'F') | |
438 | x -= 'A' - 10; | |
439 | else | |
440 | return 0; | |
441 | // output | |
442 | for(i= 0 ; i < 4 ; ++i, ++count) | |
443 | *(target++)= (x >> (3 - i)) & 1; | |
444 | } | |
445 | ||
446 | return count; | |
447 | } | |
448 | ||
449 | // convert hex to human readable binary string | |
450 | int hextobinstring(char *target, char *source) | |
451 | { | |
452 | int length; | |
453 | ||
454 | if(!(length= hextobinarray(target, source))) | |
455 | return 0; | |
456 | binarraytobinstring(target, target, length); | |
457 | return length; | |
458 | } | |
459 | ||
460 | // convert binary array of 0x00/0x01 values to hex (safe to do in place as target will always be shorter than source) | |
461 | // return number of bits converted | |
462 | int binarraytohex(char *target, char *source, int length) | |
463 | { | |
464 | unsigned char i, x; | |
465 | int j = length; | |
466 | ||
467 | if(j % 4) | |
468 | return 0; | |
469 | ||
470 | while(j) | |
471 | { | |
472 | for(i= x= 0 ; i < 4 ; ++i) | |
473 | x += ( source[i] << (3 - i)); | |
474 | sprintf(target,"%X", x); | |
475 | ++target; | |
476 | source += 4; | |
477 | j -= 4; | |
478 | } | |
479 | return length; | |
480 | } | |
481 | ||
482 | // convert binary array to human readable binary | |
483 | void binarraytobinstring(char *target, char *source, int length) | |
484 | { | |
485 | int i; | |
486 | ||
487 | for(i= 0 ; i < length ; ++i) | |
488 | *(target++)= *(source++) + '0'; | |
489 | *target= '\0'; | |
490 | } | |
491 | ||
492 | // return parity bit required to match type | |
a126332a | 493 | uint8_t GetParity( uint8_t *bits, uint8_t type, int length) |
79544b28 | 494 | { |
495 | int x; | |
ab7bb494 | 496 | for( x = 0 ; length > 0 ; --length) |
79544b28 | 497 | x += bits[length - 1]; |
498 | x %= 2; | |
79544b28 | 499 | return x ^ type; |
500 | } | |
501 | ||
502 | // add HID parity to binary array: EVEN prefix for 1st half of ID, ODD suffix for 2nd half | |
a126332a | 503 | void wiegand_add_parity(uint8_t *target, uint8_t *source, uint8_t length) |
79544b28 | 504 | { |
505 | *(target++)= GetParity(source, EVEN, length / 2); | |
506 | memcpy(target, source, length); | |
507 | target += length; | |
508 | *(target)= GetParity(source + length / 2, ODD, length / 2); | |
509 | } | |
c3c241f3 | 510 | |
0d2c5909 | 511 | // xor two arrays together for len items. The dst array contains the new xored values. |
c3c241f3 | 512 | void xor(unsigned char * dst, unsigned char * src, size_t len) { |
513 | for( ; len > 0; len--,dst++,src++) | |
514 | *dst ^= *src; | |
515 | } | |
516 | ||
517 | int32_t le24toh (uint8_t data[3]) { | |
518 | return (data[2] << 16) | (data[1] << 8) | data[0]; | |
519 | } | |
c805748f | 520 | uint32_t le32toh (uint8_t *data) { |
521 | return (uint32_t)( (data[3]<<24) | (data[2]<<16) | (data[1]<<8) | data[0]); | |
522 | } | |
0d2c5909 | 523 | // Pack a bitarray into a uint32_t. |
ad6219fc | 524 | uint32_t PackBits(uint8_t start, uint8_t len, uint8_t* bits) { |
9984b173 | 525 | |
526 | if (len > 32) return 0; | |
ad6219fc | 527 | |
528 | int i = start; | |
529 | int j = len-1; | |
ad6219fc | 530 | uint32_t tmp = 0; |
9984b173 | 531 | |
ad6219fc | 532 | for (; j >= 0; --j, ++i) |
533 | tmp |= bits[i] << j; | |
534 | ||
535 | return tmp; | |
536 | } | |
9984b173 | 537 | |
ab7bb494 | 538 | // RotateLeft - Ultralight, Desfire, works on byte level |
539 | // 00-01-02 >> 01-02-00 | |
6bb7609c | 540 | void rol(uint8_t *data, const size_t len){ |
9984b173 | 541 | uint8_t first = data[0]; |
542 | for (size_t i = 0; i < len-1; i++) { | |
543 | data[i] = data[i+1]; | |
544 | } | |
545 | data[len-1] = first; | |
6bb7609c | 546 | } |
547 | ||
0d2c5909 | 548 | // Swap bit order on a uint32_t value. Can be limited by nrbits just use say 8bits reversal |
1f1d974f | 549 | // And clears the rest of the bits. |
6bb7609c | 550 | uint32_t SwapBits(uint32_t value, int nrbits) { |
551 | uint32_t newvalue = 0; | |
552 | for(int i = 0; i < nrbits; i++) { | |
553 | newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i); | |
554 | } | |
555 | return newvalue; | |
9984b173 | 556 | } |