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hf mf isen: add collect_fm11rf08s_without_backdoor option

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This commit is contained in:
Philippe Teuwen 2024-11-20 09:33:21 +01:00
commit 830549b474
6 changed files with 239 additions and 104 deletions
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9
armsrc/mifareutil.c
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@ -983,3 +983,12 @@ int nonce_distance(uint32_t from, uint32_t to) {
int nonce16_index(uint16_t nt) {
return nonce16_distance(0x0100, nt) + 1;
}
uint32_t rewind_nonce(uint32_t from, uint16_t dist) {
uint16_t x = from >> 16;
for (uint16_t i = 0; i < dist; i++) {
x = ((x << 1 | x >> 15) & 0xffff) ^ ((x >> 1 ^ x >> 2 ^ x >> 4) & 0x100);
}
uint32_t nt = x;
return nt << 16 | prng_successor(nt, 16);
}