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FIX: looping logic error, doesn't need to increase with 1, if we do 8 checks every turn...

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iceman1001 2016-10-28 13:06:34 +02:00
parent 9f02f471db
commit 30daf914ce
1 changed files with 10 additions and 15 deletions
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25
armsrc/iso14443a.c
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@ -2145,29 +2145,24 @@ int32_t dist_nt(uint32_t nt1, uint32_t nt2) {
uint32_t nttmp1 = nt1;
uint32_t nttmp2 = nt2;
for (uint16_t i = 1; i < 32768/8; ++i) {
// 0xFFFF -- Half up and half down to find distance between nonces
for (uint16_t i = 1; i < 32768/8; i += 8) {
nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i;
nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -i;
nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i+1;
nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+1);
nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i+2;
nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+2);
nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i+3;
nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+3);
nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i+4;
nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+4);
nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i+5;
nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+5);
nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i+6;
nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+6);
nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i+7;
nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -i;
nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+1);
nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+2);
nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+3);
nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+4);
nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+5);
nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+6);
nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+7);
}
// either nt1 or nt2 are invalid nonces