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This commit is contained in:
iceman1001 2021-02-23 23:52:17 +01:00
parent 50b1591d0f
commit 673f087db9
1 changed files with 14 additions and 34 deletions
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48
tools/hitag2crack/common/ht2crackutils.c
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@ -3,16 +3,12 @@
#include "ht2crackutils.h" #include "ht2crackutils.h"
// writes a value into a buffer as a series of bytes // writes a value into a buffer as a series of bytes
void writebuf(unsigned char *buf, uint64_t val, unsigned int len) { void writebuf(unsigned char *buf, uint64_t val, uint16_t len) {
int i; for (int i = len - 1; i >= 0; i--) {
char c; char c = val & 0xff;
for (i = len - 1; i >= 0; i--) {
c = val & 0xff;
buf[i] = c; buf[i] = c;
val = val >> 8; val >>= 8;
} }
} }
@ -39,17 +35,13 @@ void shexdump(unsigned char *data, int data_len) {
void printbin(unsigned char *c) { void printbin(unsigned char *c) {
int i, j;
unsigned char x;
if (!c) { if (!c) {
printf("printbin: invalid params\n"); printf("printbin: invalid params\n");
return; return;
} }
for (int i = 0; i < 6; i++) {
for (i = 0; i < 6; i++) { unsigned char x = c[i];
x = c[i]; for (int j = 0; j < 8; j++) {
for (j = 0; j < 8; j++) {
printf("%d", (x & 0x80) >> 7); printf("%d", (x & 0x80) >> 7);
x = x << 1; x = x << 1;
} }
@ -57,33 +49,27 @@ void printbin(unsigned char *c) {
printf("\n"); printf("\n");
} }
void printbin2(uint64_t val, unsigned int size) { void printbin2(uint64_t val, unsigned int size) {
int i;
uint64_t mask = 1;
uint64_t mask = 1;
mask = mask << (size - 1); mask = mask << (size - 1);
for (i = 0; i < size; i++) { for (int i = 0; i < size; i++) {
if (val & mask) { if (val & mask) {
printf("1"); printf("1");
} else { } else {
printf("0"); printf("0");
} }
val = val << 1; val <<= 1;
} }
} }
void printstate(Hitag_State *hstate) { void printstate(Hitag_State *hstate) {
printf("shiftreg =\t"); printf("shiftreg =\t");
printbin2(hstate->shiftreg, 48); printbin2(hstate->shiftreg, 48);
printf("\n"); printf("\n");
} }
// convert hex char to binary // convert hex char to binary
unsigned char hex2bin(unsigned char c) { unsigned char hex2bin(unsigned char c) {
if ((c >= '0') && (c <= '9')) { if ((c >= '0') && (c <= '9')) {
@ -100,7 +86,6 @@ unsigned char hex2bin(unsigned char c) {
// return a single bit from a value // return a single bit from a value
int bitn(uint64_t x, int bit) { int bitn(uint64_t x, int bit) {
uint64_t bitmask = 1; uint64_t bitmask = 1;
bitmask = bitmask << bit; bitmask = bitmask << bit;
if (x & bitmask) { if (x & bitmask) {
@ -121,15 +106,11 @@ int fnR(uint64_t x) {
// the rollback function that lets us go backwards in time // the rollback function that lets us go backwards in time
void rollback(Hitag_State *hstate, unsigned int steps) { void rollback(Hitag_State *hstate, unsigned int steps) {
int i; for (int i = 0; i < steps; i++) {
for (i = 0; i < steps; i++) {
hstate->shiftreg = ((hstate->shiftreg << 1) & 0xffffffffffff) | fnR(hstate->shiftreg); hstate->shiftreg = ((hstate->shiftreg << 1) & 0xffffffffffff) | fnR(hstate->shiftreg);
} }
} }
// the three filter sub-functions that feed fnf // the three filter sub-functions that feed fnf
int fa(unsigned int i) { int fa(unsigned int i) {
return bitn(0x2C79, i); return bitn(0x2C79, i);
@ -161,9 +142,7 @@ int fnf(uint64_t s) {
// builds the lfsr for the prng (quick calcs for hitag2_nstep()) // builds the lfsr for the prng (quick calcs for hitag2_nstep())
void buildlfsr(Hitag_State *hstate) { void buildlfsr(Hitag_State *hstate) {
uint64_t state = hstate->shiftreg; uint64_t state = hstate->shiftreg;
uint64_t temp; uint64_t temp = state ^ (state >> 1);
temp = state ^ (state >> 1);
hstate->lfsr = state ^ (state >> 6) ^ (state >> 16) hstate->lfsr = state ^ (state >> 6) ^ (state >> 16)
^ (state >> 26) ^ (state >> 30) ^ (state >> 41) ^ (state >> 26) ^ (state >> 30) ^ (state >> 41)
^ (temp >> 2) ^ (temp >> 7) ^ (temp >> 22) ^ (temp >> 2) ^ (temp >> 7) ^ (temp >> 22)
@ -180,8 +159,9 @@ unsigned long hexreversetoulong(char *hex) {
return 0L; return 0L;
for (i = 0 ; i < 4 ; ++i) { for (i = 0 ; i < 4 ; ++i) {
if (sscanf(hex, "%2X", &x) != 1) if (sscanf(hex, "%2X", &x) != 1) {
return 0L; return 0L;
}
ret += ((unsigned long) x) << i * 8; ret += ((unsigned long) x) << i * 8;
hex += 2; hex += 2;
} }