mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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292 lines
7.2 KiB
C
292 lines
7.2 KiB
C
//-----------------------------------------------------------------------------
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// Jonathan Westhues, Sept 2005
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// Utility functions used in many places, not specific to any piece of code.
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//-----------------------------------------------------------------------------
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#include "util.h"
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size_t nbytes(size_t nbits) {
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return (nbits >> 3)+((nbits % 8) > 0);
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}
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/*
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ref http://www.csm.ornl.gov/~dunigan/crc.html
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Returns the value v with the bottom b [0,32] bits reflected.
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Example: reflect(0x3e23L,3) == 0x3e26
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*/
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uint32_t reflect(uint32_t v, int b) {
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uint32_t t = v;
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for ( int i = 0; i < b; ++i) {
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if (t & 1)
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v |= BITMASK((b-1)-i);
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else
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v &= ~BITMASK((b-1)-i);
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t>>=1;
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}
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return v;
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}
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uint8_t reflect8(uint8_t b) {
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return ((b * 0x80200802ULL) & 0x0884422110ULL) * 0x0101010101ULL >> 32;
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}
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uint16_t reflect16(uint16_t b) {
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uint16_t v = 0;
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v |= (b & 0x8000) >> 15;
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v |= (b & 0x4000) >> 13;
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v |= (b & 0x2000) >> 11;
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v |= (b & 0x1000) >> 9;
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v |= (b & 0x0800) >> 7;
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v |= (b & 0x0400) >> 5;
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v |= (b & 0x0200) >> 3;
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v |= (b & 0x0100) >> 1;
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v |= (b & 0x0080) << 1;
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v |= (b & 0x0040) << 3;
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v |= (b & 0x0020) << 5;
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v |= (b & 0x0010) << 7;
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v |= (b & 0x0008) << 9;
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v |= (b & 0x0004) << 11;
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v |= (b & 0x0002) << 13;
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v |= (b & 0x0001) << 15;
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return v;
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}
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void num_to_bytes(uint64_t n, size_t len, uint8_t* dest) {
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while (len--) {
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dest[len] = (uint8_t) n;
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n >>= 8;
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}
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}
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uint64_t bytes_to_num(uint8_t* src, size_t len) {
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uint64_t num = 0;
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while (len--) {
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num = (num << 8) | (*src);
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src++;
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}
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return num;
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}
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// RotateLeft - Ultralight, Desfire
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void rol(uint8_t *data, const size_t len) {
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uint8_t first = data[0];
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for (size_t i = 0; i < len-1; i++) {
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data[i] = data[i+1];
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}
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data[len-1] = first;
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}
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void lsl (uint8_t *data, size_t len) {
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for (size_t n = 0; n < len - 1; n++) {
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data[n] = (data[n] << 1) | (data[n+1] >> 7);
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}
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data[len - 1] <<= 1;
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}
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int32_t le24toh (uint8_t data[3]) {
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return (data[2] << 16) | (data[1] << 8) | data[0];
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}
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//convert hex digit to integer
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uint8_t hex2int(char hexchar){
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switch(hexchar){
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case '0': return 0; break;
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case '1': return 1; break;
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case '2': return 2; break;
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case '3': return 3; break;
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case '4': return 4; break;
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case '5': return 5; break;
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case '6': return 6; break;
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case '7': return 7; break;
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case '8': return 8; break;
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case '9': return 9; break;
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case 'a':
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case 'A': return 10; break;
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case 'b':
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case 'B': return 11; break;
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case 'c':
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case 'C': return 12; break;
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case 'd':
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case 'D': return 13; break;
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case 'e':
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case 'E': return 14; break;
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case 'f':
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case 'F': return 15; break;
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default:
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return 0;
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}
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}
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void LEDsoff() {
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LED_A_OFF();
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LED_B_OFF();
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LED_C_OFF();
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LED_D_OFF();
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}
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// LEDs: R(C) O(A) G(B) -- R(D) [1, 2, 4 and 8]
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void LED(int led, int ms) {
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if (led & LED_RED)
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LED_C_ON();
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if (led & LED_ORANGE)
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LED_A_ON();
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if (led & LED_GREEN)
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LED_B_ON();
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if (led & LED_RED2)
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LED_D_ON();
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if (!ms)
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return;
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SpinDelay(ms);
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if (led & LED_RED)
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LED_C_OFF();
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if (led & LED_ORANGE)
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LED_A_OFF();
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if (led & LED_GREEN)
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LED_B_OFF();
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if (led & LED_RED2)
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LED_D_OFF();
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}
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// Determine if a button is double clicked, single clicked,
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// not clicked, or held down (for ms || 1sec)
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// In general, don't use this function unless you expect a
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// double click, otherwise it will waste 500ms -- use BUTTON_HELD instead
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int BUTTON_CLICKED(int ms) {
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// Up to 500ms in between clicks to mean a double click
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int ticks = (48000 * (ms ? ms : 1000)) >> 10;
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// If we're not even pressed, forget about it!
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if (!BUTTON_PRESS())
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return BUTTON_NO_CLICK;
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// Borrow a PWM unit for my real-time clock
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AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
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// 48 MHz / 1024 gives 46.875 kHz
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AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
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AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
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AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
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uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
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int letoff = 0;
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for(;;)
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{
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uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
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// We haven't let off the button yet
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if (!letoff)
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{
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// We just let it off!
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if (!BUTTON_PRESS())
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{
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letoff = 1;
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// reset our timer for 500ms
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start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
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ticks = (48000 * (500)) >> 10;
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}
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// Still haven't let it off
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else
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// Have we held down a full second?
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if (now == (uint16_t)(start + ticks))
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return BUTTON_HOLD;
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}
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// We already let off, did we click again?
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else
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// Sweet, double click!
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if (BUTTON_PRESS())
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return BUTTON_DOUBLE_CLICK;
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// Have we ran out of time to double click?
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else
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if (now == (uint16_t)(start + ticks))
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// At least we did a single click
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return BUTTON_SINGLE_CLICK;
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WDT_HIT();
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}
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// We should never get here
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return BUTTON_ERROR;
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}
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// Determine if a button is held down
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int BUTTON_HELD(int ms) {
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// If button is held for one second
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int ticks = (48000 * (ms ? ms : 1000)) >> 10;
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// If we're not even pressed, forget about it!
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if (!BUTTON_PRESS())
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return BUTTON_NO_CLICK;
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// Borrow a PWM unit for my real-time clock
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AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
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// 48 MHz / 1024 gives 46.875 kHz
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AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
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AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
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AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
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uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
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for(;;)
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{
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uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
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// As soon as our button let go, we didn't hold long enough
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if (!BUTTON_PRESS())
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return BUTTON_SINGLE_CLICK;
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// Have we waited the full second?
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else
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if (now == (uint16_t)(start + ticks))
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return BUTTON_HOLD;
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WDT_HIT();
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}
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// We should never get here
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return BUTTON_ERROR;
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}
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/* Similar to FpgaGatherVersion this formats stored version information
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* into a string representation. It takes a pointer to the struct version_information,
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* verifies the magic properties, then stores a formatted string, prefixed by
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* prefix in dst.
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*/
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void FormatVersionInformation(char *dst, int len, const char *prefix, void *version_information) {
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struct version_information *v = (struct version_information*)version_information;
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dst[0] = 0;
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strncat(dst, prefix, len-1);
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if (v->magic != VERSION_INFORMATION_MAGIC) {
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strncat(dst, "Missing/Invalid version information\n", len - strlen(dst) - 1);
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return;
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}
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if (v->versionversion != 1) {
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strncat(dst, "Version information not understood\n", len - strlen(dst) - 1);
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return;
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}
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if (!v->present) {
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strncat(dst, "Version information not available\n", len - strlen(dst) - 1);
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return;
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}
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strncat(dst, v->gitversion, len - strlen(dst) - 1);
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if (v->clean == 0) {
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strncat(dst, "-unclean", len - strlen(dst) - 1);
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} else if (v->clean == 2) {
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strncat(dst, "-suspect", len - strlen(dst) - 1);
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}
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strncat(dst, " ", len - strlen(dst) - 1);
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strncat(dst, v->buildtime, len - strlen(dst) - 1);
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strncat(dst, "\n", len - strlen(dst) - 1);
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}
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