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correct 1st key calculation

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This commit is contained in:
Oleg Moiseenko 2018-02-10 20:28:30 +02:00
commit 7b215d149a
3 changed files with 63 additions and 11 deletions
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62
client/cmdhflist.c
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@ -21,6 +21,8 @@
#include "iso14443crc.h"
#include "parity.h"
#include "protocols.h"
#include "crapto1/crapto1.h"
#include "mifarehost.h"
enum MifareAuthSeq {
@ -39,7 +41,7 @@ static TAuthData AuthData;
void ClearAuthData() {
AuthData.uid = 0;
AuthData.nt = 0;
AuthData.first_auth = false;
AuthData.first_auth = true;
}
/**
@ -189,11 +191,11 @@ void annotateIso14443a(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8_t* parity, uint8_t paritysize, bool isResponse) {
// get UID
if (MifareAuthState == masNone) {
if (cmdsize == 7 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && cmd[1] == 0x70) {
if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && cmd[1] == 0x70) {
ClearAuthData();
AuthData.uid = bytes_to_num(&cmd[2], 4);
}
if (cmdsize == 7 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && cmd[1] == 0x70) {
if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && cmd[1] == 0x70) {
ClearAuthData();
AuthData.uid = bytes_to_num(&cmd[2], 4);
}
@ -205,9 +207,9 @@ void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8
snprintf(exp,size,"AUTH: nt %s", (AuthData.first_auth) ? "" : "(enc)");
MifareAuthState = masNrAr;
if (AuthData.first_auth)
AuthData.nt = bytes_to_num(cmd, cmdsize);
AuthData.nt = bytes_to_num(cmd, 4);
else
AuthData.nt_enc = bytes_to_num(cmd, cmdsize);
AuthData.nt_enc = bytes_to_num(cmd, 4);
AuthData.nt_enc_par = parity[0];
return;
} else {
@ -218,8 +220,8 @@ void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8
if (cmdsize == 8 && !isResponse) {
snprintf(exp,size,"AUTH: nr ar (enc)");
MifareAuthState = masAt;
AuthData.nr_enc = bytes_to_num(cmd, cmdsize);
AuthData.ar_enc = bytes_to_num(&cmd[3], cmdsize);
AuthData.nr_enc = bytes_to_num(cmd, 4);
AuthData.ar_enc = bytes_to_num(&cmd[4], 4);
AuthData.ar_enc_par = parity[0] << 4;
return;
} else {
@ -230,7 +232,7 @@ void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8
if (cmdsize == 4 && isResponse) {
snprintf(exp,size,"AUTH: at (enc)");
MifareAuthState = masFirstData;
AuthData.at_enc = bytes_to_num(cmd, cmdsize);
AuthData.at_enc = bytes_to_num(cmd, 4);
AuthData.at_enc_par = parity[0];
return;
} else {
@ -245,3 +247,47 @@ void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8
annotateIso14443a(exp, size, cmd, cmdsize);
}
bool DecodeMifareData(uint8_t *cmd, uint8_t cmdsize, bool isResponse, uint8_t *mfData, size_t *mfDataLen) {
*mfDataLen = 0;
if (cmdsize > 32)
return false;
if (MifareAuthState == masFirstData) {
if (AuthData.first_auth) {
uint32_t ks2 = AuthData.ar_enc ^ prng_successor(AuthData.nt, 64);
uint32_t ks3 = AuthData.at_enc ^ prng_successor(AuthData.nt, 96);
struct Crypto1State *revstate = lfsr_recovery64(ks2, ks3);
lfsr_rollback_word(revstate, 0, 0);
lfsr_rollback_word(revstate, 0, 0);
lfsr_rollback_word(revstate, AuthData.nr_enc, 1);
lfsr_rollback_word(revstate, AuthData.uid ^ AuthData.nt, 0);
uint64_t lfsr = 0;
crypto1_get_lfsr(revstate, &lfsr);
crypto1_destroy(revstate);
// LastKey = lfsr;
printf("uid:%x nt:%x ar_enc:%x at_enc:%x\n", AuthData.uid, AuthData.nt, AuthData.ar_enc, AuthData.at_enc);
printf("AUTH: probable key:%x%x Prng:%s ks2:%08x ks3:%08x\n",
(unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF),
validate_prng_nonce(AuthData.nt) ? "WEAK": "HARDEND",
ks2,
ks3);
AuthData.first_auth = false;
} else {
}
MifareAuthState = masData;
return true;
}
if (MifareAuthState == masData) {
}
return *mfDataLen > 0;
}