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FIX: `hf mf sim` - authentication works again.
[proxmark3-svn] / armsrc / util.c
1 //-----------------------------------------------------------------------------
2 // Jonathan Westhues, Sept 2005
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 // Utility functions used in many places, not specific to any piece of code.
9 //-----------------------------------------------------------------------------
10 #include "util.h"
11
12 size_t nbytes(size_t nbits) {
13 return (nbits >> 3)+((nbits % 8) > 0);
14 }
15
16 uint32_t SwapBits(uint32_t value, int nrbits) {
17 uint32_t newvalue = 0;
18 for(int i = 0; i < nrbits; i++) {
19 newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i);
20 }
21 return newvalue;
22 }
23
24 /*
25 ref http://www.csm.ornl.gov/~dunigan/crc.html
26 Returns the value v with the bottom b [0,32] bits reflected.
27 Example: reflect(0x3e23L,3) == 0x3e26
28 */
29 uint32_t reflect(uint32_t v, int b) {
30 uint32_t t = v;
31 for ( int i = 0; i < b; ++i) {
32 if (t & 1)
33 v |= BITMASK((b-1)-i);
34 else
35 v &= ~BITMASK((b-1)-i);
36 t >>= 1;
37 }
38 return v;
39 }
40
41 void num_to_bytes(uint64_t n, size_t len, uint8_t* dest) {
42 while (len--) {
43 dest[len] = (uint8_t) n;
44 n >>= 8;
45 }
46 }
47
48 uint64_t bytes_to_num(uint8_t* src, size_t len) {
49 uint64_t num = 0;
50 while (len--) {
51 num = (num << 8) | (*src);
52 src++;
53 }
54 return num;
55 }
56
57 // RotateLeft - Ultralight, Desfire
58 void rol(uint8_t *data, const size_t len) {
59 uint8_t first = data[0];
60 for (size_t i = 0; i < len-1; i++) {
61 data[i] = data[i+1];
62 }
63 data[len-1] = first;
64 }
65
66 void lsl (uint8_t *data, size_t len) {
67 for (size_t n = 0; n < len - 1; n++) {
68 data[n] = (data[n] << 1) | (data[n+1] >> 7);
69 }
70 data[len - 1] <<= 1;
71 }
72
73 int32_t le24toh (uint8_t data[3]) {
74 return (data[2] << 16) | (data[1] << 8) | data[0];
75 }
76
77 //convert hex digit to integer
78 uint8_t hex2int(char hexchar){
79 switch(hexchar){
80 case '0': return 0; break;
81 case '1': return 1; break;
82 case '2': return 2; break;
83 case '3': return 3; break;
84 case '4': return 4; break;
85 case '5': return 5; break;
86 case '6': return 6; break;
87 case '7': return 7; break;
88 case '8': return 8; break;
89 case '9': return 9; break;
90 case 'a':
91 case 'A': return 10; break;
92 case 'b':
93 case 'B': return 11; break;
94 case 'c':
95 case 'C': return 12; break;
96 case 'd':
97 case 'D': return 13; break;
98 case 'e':
99 case 'E': return 14; break;
100 case 'f':
101 case 'F': return 15; break;
102 default:
103 return 0;
104 }
105 }
106
107 void LEDsoff() {
108 LED_A_OFF();
109 LED_B_OFF();
110 LED_C_OFF();
111 LED_D_OFF();
112 }
113
114 // LEDs: R(C) O(A) G(B) -- R(D) [1, 2, 4 and 8]
115 void LED(int led, int ms) {
116 if (led & LED_RED)
117 LED_C_ON();
118 if (led & LED_ORANGE)
119 LED_A_ON();
120 if (led & LED_GREEN)
121 LED_B_ON();
122 if (led & LED_RED2)
123 LED_D_ON();
124
125 if (!ms)
126 return;
127
128 SpinDelay(ms);
129
130 if (led & LED_RED)
131 LED_C_OFF();
132 if (led & LED_ORANGE)
133 LED_A_OFF();
134 if (led & LED_GREEN)
135 LED_B_OFF();
136 if (led & LED_RED2)
137 LED_D_OFF();
138 }
139
140 // Determine if a button is double clicked, single clicked,
141 // not clicked, or held down (for ms || 1sec)
142 // In general, don't use this function unless you expect a
143 // double click, otherwise it will waste 500ms -- use BUTTON_HELD instead
144 int BUTTON_CLICKED(int ms) {
145 // Up to 500ms in between clicks to mean a double click
146 int ticks = (48000 * (ms ? ms : 1000)) >> 10;
147
148 // If we're not even pressed, forget about it!
149 if (!BUTTON_PRESS())
150 return BUTTON_NO_CLICK;
151
152 // Borrow a PWM unit for my real-time clock
153 AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
154 // 48 MHz / 1024 gives 46.875 kHz
155 AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
156 AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
157 AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
158
159 uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
160
161 int letoff = 0;
162 for(;;)
163 {
164 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
165
166 // We haven't let off the button yet
167 if (!letoff)
168 {
169 // We just let it off!
170 if (!BUTTON_PRESS())
171 {
172 letoff = 1;
173
174 // reset our timer for 500ms
175 start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
176 ticks = (48000 * (500)) >> 10;
177 }
178
179 // Still haven't let it off
180 else
181 // Have we held down a full second?
182 if (now == (uint16_t)(start + ticks))
183 return BUTTON_HOLD;
184 }
185
186 // We already let off, did we click again?
187 else
188 // Sweet, double click!
189 if (BUTTON_PRESS())
190 return BUTTON_DOUBLE_CLICK;
191
192 // Have we ran out of time to double click?
193 else
194 if (now == (uint16_t)(start + ticks))
195 // At least we did a single click
196 return BUTTON_SINGLE_CLICK;
197
198 WDT_HIT();
199 }
200
201 // We should never get here
202 return BUTTON_ERROR;
203 }
204
205 // Determine if a button is held down
206 int BUTTON_HELD(int ms) {
207 // If button is held for one second
208 int ticks = (48000 * (ms ? ms : 1000)) >> 10;
209
210 // If we're not even pressed, forget about it!
211 if (!BUTTON_PRESS())
212 return BUTTON_NO_CLICK;
213
214 // Borrow a PWM unit for my real-time clock
215 AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
216 // 48 MHz / 1024 gives 46.875 kHz
217 AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
218 AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
219 AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
220
221 uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
222
223 for(;;)
224 {
225 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
226
227 // As soon as our button let go, we didn't hold long enough
228 if (!BUTTON_PRESS())
229 return BUTTON_SINGLE_CLICK;
230
231 // Have we waited the full second?
232 else
233 if (now == (uint16_t)(start + ticks))
234 return BUTTON_HOLD;
235
236 WDT_HIT();
237 }
238
239 // We should never get here
240 return BUTTON_ERROR;
241 }
242
243 /* Similar to FpgaGatherVersion this formats stored version information
244 * into a string representation. It takes a pointer to the struct version_information,
245 * verifies the magic properties, then stores a formatted string, prefixed by
246 * prefix in dst.
247 */
248 void FormatVersionInformation(char *dst, int len, const char *prefix, void *version_information) {
249 struct version_information *v = (struct version_information*)version_information;
250 dst[0] = 0;
251 strncat(dst, prefix, len-1);
252 if(v->magic != VERSION_INFORMATION_MAGIC) {
253 strncat(dst, "Missing/Invalid version information\n", len - strlen(dst) - 1);
254 return;
255 }
256 if(v->versionversion != 1) {
257 strncat(dst, "Version information not understood\n", len - strlen(dst) - 1);
258 return;
259 }
260 if(!v->present) {
261 strncat(dst, "Version information not available\n", len - strlen(dst) - 1);
262 return;
263 }
264
265 strncat(dst, v->gitversion, len - strlen(dst) - 1);
266 if(v->clean == 0) {
267 strncat(dst, "-unclean", len - strlen(dst) - 1);
268 } else if(v->clean == 2) {
269 strncat(dst, "-suspect", len - strlen(dst) - 1);
270 }
271
272 strncat(dst, " ", len - strlen(dst) - 1);
273 strncat(dst, v->buildtime, len - strlen(dst) - 1);
274 strncat(dst, "\n", len - strlen(dst) - 1);
275 }
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