From 7b215d149ac4fd5709635111d86a2062fc7ac3ad Mon Sep 17 00:00:00 2001 From: Oleg Moiseenko Date: Sat, 10 Feb 2018 20:28:30 +0200 Subject: [PATCH] correct 1st key calculation --- client/cmdhf.c | 10 ++++++-- client/cmdhflist.c | 62 ++++++++++++++++++++++++++++++++++++++++------ client/cmdhflist.h | 2 +- 3 files changed, 63 insertions(+), 11 deletions(-) diff --git a/client/cmdhf.c b/client/cmdhf.c index 3256b69a..9f3ff4e4 100644 --- a/client/cmdhf.c +++ b/client/cmdhf.c @@ -300,6 +300,8 @@ uint16_t printTraceLine(uint16_t tracepos, uint16_t traceLen, uint8_t *trace, ui uint8_t topaz_reader_command[9]; uint32_t timestamp, first_timestamp, EndOfTransmissionTimestamp; char explanation[30] = {0}; + uint8_t mfData[32] = {0}; + size_t mfDataLen = 0; if (tracepos + sizeof(uint32_t) + sizeof(uint16_t) + sizeof(uint16_t) > traceLen) return traceLen; @@ -431,8 +433,12 @@ uint16_t printTraceLine(uint16_t tracepos, uint16_t traceLen, uint8_t *trace, ui } } -// if (DecodeMifareData(frame, data_len, isResponse)) { -// }; + if (DecodeMifareData(frame, data_len, isResponse, mfData, &mfDataLen)) { + PrintAndLog(" | | |%-64s | %s| %s", + sprint_hex(mfData, mfDataLen), + "", + (false) ? explanation : ""); + }; if (is_last_record(tracepos, trace, traceLen)) return traceLen; diff --git a/client/cmdhflist.c b/client/cmdhflist.c index 5ff3192b..0eaafa68 100644 --- a/client/cmdhflist.c +++ b/client/cmdhflist.c @@ -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; +} + diff --git a/client/cmdhflist.h b/client/cmdhflist.h index 329df7db..7d95cc1c 100644 --- a/client/cmdhflist.h +++ b/client/cmdhflist.h @@ -32,6 +32,6 @@ extern uint8_t iso14443A_CRC_check(bool isResponse, uint8_t* data, uint8_t len); extern uint8_t mifare_CRC_check(bool isResponse, uint8_t* data, uint8_t len); extern void annotateIso14443a(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize); extern void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8_t* parity, uint8_t paritysize, bool isResponse); - +extern bool DecodeMifareData(uint8_t *cmd, uint8_t cmdsize, bool isResponse, uint8_t *mfData, size_t *mfDataLen); #endif // CMDHFLIST -- 2.39.2