mirror of
https://github.com/DarkFlippers/unleashed-firmware.git
synced 2024-12-18 10:51:54 +03:00
d31578508a
* digital signal: introduce digital signal * nfca: add nfca signal encoder * nfc: add mifare classic emulation scene * nfca: add classic emulation support to lib and hal * mifare classic: support basic read commands * nfc: add mifare classic menu scene * mifare classic: start parsing commands in emulation * mifare classic: add nested auth * nfc: fix errors * mifare classic: add encrypt function * nfc: fix mifare classic save * lib hex: add hex uint64_t ASCII parser * flipper format: add uint64 hex format support * nfc: add mifare classic key map * nfc: hide mifare classic keys on emulation * mifare classic: add NACK responce * nfc: add partial bytes support in transparent mode * nfc: mifare classic add shadow file support * digital signal: move arr buffer from BSS to heap * mifare classic: process access bits more careful * nfca: fix memory leack * nfc: format sources * mifare classic: cleun up Co-authored-by: あく <alleteam@gmail.com>
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
#include "crypto1.h"
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#include "nfc_util.h"
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#include <furi.h>
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// Algorithm from https://github.com/RfidResearchGroup/proxmark3.git
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#define SWAPENDIAN(x) (x = (x >> 8 & 0xff00ff) | (x & 0xff00ff) << 8, x = x >> 16 | x << 16)
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#define LF_POLY_ODD (0x29CE5C)
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#define LF_POLY_EVEN (0x870804)
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#define BEBIT(x, n) FURI_BIT(x, (n) ^ 24)
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void crypto1_reset(Crypto1* crypto1) {
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furi_assert(crypto1);
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crypto1->even = 0;
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crypto1->odd = 0;
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}
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void crypto1_init(Crypto1* crypto1, uint64_t key) {
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furi_assert(crypto1);
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crypto1->even = 0;
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crypto1->odd = 0;
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for(int8_t i = 47; i > 0; i -= 2) {
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crypto1->odd = crypto1->odd << 1 | FURI_BIT(key, (i - 1) ^ 7);
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crypto1->even = crypto1->even << 1 | FURI_BIT(key, i ^ 7);
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}
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}
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uint32_t crypto1_filter(uint32_t in) {
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uint32_t out = 0;
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out = 0xf22c0 >> (in & 0xf) & 16;
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out |= 0x6c9c0 >> (in >> 4 & 0xf) & 8;
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out |= 0x3c8b0 >> (in >> 8 & 0xf) & 4;
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out |= 0x1e458 >> (in >> 12 & 0xf) & 2;
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out |= 0x0d938 >> (in >> 16 & 0xf) & 1;
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return FURI_BIT(0xEC57E80A, out);
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}
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uint8_t crypto1_bit(Crypto1* crypto1, uint8_t in, int is_encrypted) {
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furi_assert(crypto1);
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uint8_t out = crypto1_filter(crypto1->odd);
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uint32_t feed = out & (!!is_encrypted);
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feed ^= !!in;
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feed ^= LF_POLY_ODD & crypto1->odd;
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feed ^= LF_POLY_EVEN & crypto1->even;
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crypto1->even = crypto1->even << 1 | (nfc_util_even_parity32(feed));
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FURI_SWAP(crypto1->odd, crypto1->even);
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return out;
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}
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uint8_t crypto1_byte(Crypto1* crypto1, uint8_t in, int is_encrypted) {
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furi_assert(crypto1);
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uint8_t out = 0;
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for(uint8_t i = 0; i < 8; i++) {
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out |= crypto1_bit(crypto1, FURI_BIT(in, i), is_encrypted) << i;
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}
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return out;
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}
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uint32_t crypto1_word(Crypto1* crypto1, uint32_t in, int is_encrypted) {
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furi_assert(crypto1);
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uint32_t out = 0;
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for(uint8_t i = 0; i < 32; i++) {
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out |= crypto1_bit(crypto1, BEBIT(in, i), is_encrypted) << (24 ^ i);
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}
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return out;
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}
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uint32_t prng_successor(uint32_t x, uint32_t n) {
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SWAPENDIAN(x);
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while(n--) x = x >> 1 | (x >> 16 ^ x >> 18 ^ x >> 19 ^ x >> 21) << 31;
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return SWAPENDIAN(x);
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}
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