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https://github.com/Proxmark/proxmark3.git
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f9c1dcd9f6
This makes the PM3 generate pseudo-random nonces rather than sequential nonces, to make it act a bit more like a "real" MFC card. A reader would otherwise be able to detect the PM3 probing based on the predictable nonces and throw different authentication challenges (or refuse to authenticate at all). The code includes an implementation of a rand-like function (prand), similar to the one from libc, which is seeded automatically based on the time it takes between the PM3 starting up and the first call to the RNG. This isn't cryptographically random, but should be "good enough" to be able to evade basic detection.
60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
//-----------------------------------------------------------------------------
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// Jonathan Westhues, Aug 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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#ifndef __UTIL_H
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#define __UTIL_H
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#include <stddef.h>
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#include <stdint.h>
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#include "common.h"
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#define BYTEx(x, n) (((x) >> (n * 8)) & 0xff )
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#define LED_RED 1
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#define LED_ORANGE 2
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#define LED_GREEN 4
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#define LED_RED2 8
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#define BUTTON_HOLD 1
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#define BUTTON_NO_CLICK 0
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#define BUTTON_SINGLE_CLICK -1
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#define BUTTON_DOUBLE_CLICK -2
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#define BUTTON_ERROR -99
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void print_result(char *name, uint8_t *buf, size_t len);
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size_t nbytes(size_t nbits);
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uint32_t SwapBits(uint32_t value, int nrbits);
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void num_to_bytes(uint64_t n, size_t len, uint8_t* dest);
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uint64_t bytes_to_num(uint8_t* src, size_t len);
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void rol(uint8_t *data, const size_t len);
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void lsl (uint8_t *data, size_t len);
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int32_t le24toh (uint8_t data[3]);
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void SpinDelay(int ms);
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void SpinDelayUs(int us);
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void LED(int led, int ms);
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void LEDsoff();
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int BUTTON_CLICKED(int ms);
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int BUTTON_HELD(int ms);
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void FormatVersionInformation(char *dst, int len, const char *prefix, void *version_information);
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void StartTickCount();
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uint32_t RAMFUNC GetTickCount();
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void StartCountUS();
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uint32_t RAMFUNC GetCountUS();
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uint32_t RAMFUNC GetDeltaCountUS();
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void StartCountSspClk();
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uint32_t RAMFUNC GetCountSspClk();
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uint32_t prand();
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#endif
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