X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/20f9a2a1d54952ed15066c93490f0e8fb0d43b67..3fe4ff4f0329d6bde9585b77966d42dfc3f612f5:/armsrc/mifareutil.c diff --git a/armsrc/mifareutil.c b/armsrc/mifareutil.c index ede1cbc9..7c856557 100644 --- a/armsrc/mifareutil.c +++ b/armsrc/mifareutil.c @@ -1,12 +1,12 @@ //----------------------------------------------------------------------------- -// Merlok, May 2011 -// Many authors, that makes it possible +// Merlok, May 2011, 2012 +// Many authors, whom made it possible // // This code is licensed to you under the terms of the GNU GPL, version 2 or, // at your option, any later version. See the LICENSE.txt file for the text of // the license. //----------------------------------------------------------------------------- -// code for work with mifare cards. +// Work with mifare cards. //----------------------------------------------------------------------------- #include "proxmark3.h" @@ -19,15 +19,93 @@ #include "crapto1.h" #include "mifareutil.h" -uint8_t* mifare_get_bigbufptr(void) { - return (((uint8_t *)BigBuf) + 3560); // was 3560 - tied to other size changes +int MF_DBGLEVEL = MF_DBG_ALL; + +// memory management +uint8_t* get_bigbufptr_recvrespbuf(void) { + return (((uint8_t *)BigBuf) + RECV_RESP_OFFSET); +} +uint8_t* get_bigbufptr_recvcmdbuf(void) { + return (((uint8_t *)BigBuf) + RECV_CMD_OFFSET); +} +uint8_t* get_bigbufptr_emlcardmem(void) { + return (((uint8_t *)BigBuf) + CARD_MEMORY_OFFSET); } -int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t* answer) -{ - uint8_t dcmd[4], ecmd[4]; - uint32_t pos, par, res; +// crypto1 helpers +void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len){ + uint8_t bt = 0; + int i; + + if (len != 1) { + for (i = 0; i < len; i++) + data[i] = crypto1_byte(pcs, 0x00, 0) ^ data[i]; + } else { + bt = 0; + for (i = 0; i < 4; i++) + bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data[0], i)) << i; + + data[0] = bt; + } + return; +} + +void mf_crypto1_encrypt(struct Crypto1State *pcs, uint8_t *data, uint16_t len, uint8_t *par) { + uint8_t bt = 0; + int i; + par[0] = 0; + + for (i = 0; i < len; i++) { + bt = data[i]; + data[i] = crypto1_byte(pcs, 0x00, 0) ^ data[i]; + if((i&0x0007) == 0) + par[i>>3] = 0; + par[i>>3] |= (((filter(pcs->odd) ^ oddparity(bt)) & 0x01)<<(7-(i&0x0007))); + } + return; +} + +uint8_t mf_crypto1_encrypt4bit(struct Crypto1State *pcs, uint8_t data) { + uint8_t bt = 0; + int i; + + for (i = 0; i < 4; i++) + bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data, i)) << i; + + return bt; +} +// send commands +int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t* answer, uint8_t *answer_parity, uint32_t *timing) +{ + return mifare_sendcmd_shortex(pcs, crypted, cmd, data, answer, answer_parity, timing); +} + +int mifare_sendcmd_short_special(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t* data, uint8_t* answer, uint8_t *answer_parity, uint32_t *timing) +{ + uint8_t dcmd[8]; + dcmd[0] = cmd; + dcmd[1] = data[0]; + dcmd[2] = data[1]; + dcmd[3] = data[2]; + dcmd[4] = data[3]; + dcmd[5] = data[4]; + AppendCrc14443a(dcmd, 6); + ReaderTransmit(dcmd, sizeof(dcmd), NULL); + int len = ReaderReceive(answer, answer_parity); + if(!len) + { + if (MF_DBGLEVEL >= 1) Dbprintf("Authentication failed. Card timeout."); + return 2; + } + return len; +} + +int mifare_sendcmd_shortex(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t *answer, uint8_t *answer_parity, uint32_t *timing) +{ + uint8_t dcmd[4], ecmd[4]; + uint16_t pos, res; + uint8_t par[1]; // 1 Byte parity is enough here dcmd[0] = cmd; dcmd[1] = data; AppendCrc14443a(dcmd, 2); @@ -35,22 +113,24 @@ int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, memcpy(ecmd, dcmd, sizeof(dcmd)); if (crypted) { - par = 0; + par[0] = 0; for (pos = 0; pos < 4; pos++) { ecmd[pos] = crypto1_byte(pcs, 0x00, 0) ^ dcmd[pos]; - par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(dcmd[pos])) & 0x01) * 0x08 ); + par[0] |= (((filter(pcs->odd) ^ oddparity(dcmd[pos])) & 0x01) << (7-pos)); } - ReaderTransmitPar(ecmd, sizeof(ecmd), par); + ReaderTransmitPar(ecmd, sizeof(ecmd), par, timing); } else { - ReaderTransmit(dcmd, sizeof(dcmd)); + ReaderTransmit(dcmd, sizeof(dcmd), timing); } - int len = ReaderReceive(answer); - - if (crypted) { + int len = ReaderReceive(answer, par); + + if (answer_parity) *answer_parity = par[0]; + + if (crypted == CRYPT_ALL) { if (len == 1) { res = 0; for (pos = 0; pos < 4; pos++) @@ -69,75 +149,98 @@ int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, return len; } -int mifare_classic_auth(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t keyType, uint64_t ui64Key, uint64_t isNested) +// mifare commands +int mifare_classic_auth(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t keyType, uint64_t ui64Key, uint8_t isNested) +{ + return mifare_classic_authex(pcs, uid, blockNo, keyType, ui64Key, isNested, NULL, NULL); +} + +int mifare_classic_authex(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t keyType, uint64_t ui64Key, uint8_t isNested, uint32_t *ntptr, uint32_t *timing) { // variables - int len; + int len; uint32_t pos; uint8_t tmp4[4]; - byte_t par = 0; - byte_t ar[4]; + uint8_t par[1] = {0x00}; + byte_t nr[4]; uint32_t nt, ntpp; // Supplied tag nonce uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }; - uint8_t* receivedAnswer = mifare_get_bigbufptr(); - - // Transmit MIFARE_CLASSIC_AUTH - len = mifare_sendcmd_short(pcs, isNested, 0x60 + (keyType & 0x01), blockNo, receivedAnswer); -// Dbprintf("rand nonce len: %x", len); - if (len != 4) return 1; + uint8_t *receivedAnswer = get_bigbufptr_recvrespbuf(); + uint8_t *receivedAnswerPar = receivedAnswer + MAX_FRAME_SIZE; + + // Transmit MIFARE_CLASSIC_AUTH + len = mifare_sendcmd_short(pcs, isNested, 0x60 + (keyType & 0x01), blockNo, receivedAnswer, receivedAnswerPar, timing); + if (MF_DBGLEVEL >= 4) Dbprintf("rand tag nonce len: %x", len); + if (len != 4) return 1; - ar[0] = 0x55; - ar[1] = 0x41; - ar[2] = 0x49; - ar[3] = 0x92; + // "random" reader nonce: + nr[0] = 0x55; + nr[1] = 0x41; + nr[2] = 0x49; + nr[3] = 0x92; // Save the tag nonce (nt) nt = bytes_to_num(receivedAnswer, 4); - Dbprintf("uid: %x nt: %x", uid, nt); // ----------------------------- crypto1 create - // Init cipher with key + if (isNested) + crypto1_destroy(pcs); + + // Init cipher with key crypto1_create(pcs, ui64Key); - // Load (plain) uid^nt into the cipher - crypto1_word(pcs, nt ^ uid, 0); + if (isNested == AUTH_NESTED) { + // decrypt nt with help of new key + nt = crypto1_word(pcs, nt ^ uid, 1) ^ nt; + } else { + // Load (plain) uid^nt into the cipher + crypto1_word(pcs, nt ^ uid, 0); + } + + // some statistic + if (!ntptr && (MF_DBGLEVEL >= 3)) + Dbprintf("auth uid: %08x nt: %08x", uid, nt); + + // save Nt + if (ntptr) + *ntptr = nt; - par = 0; - // Generate (encrypted) nr+parity by loading it into the cipher (Nr) - for (pos = 0; pos < 4; pos++) - { - mf_nr_ar[pos] = crypto1_byte(pcs, ar[pos], 0) ^ ar[pos]; - par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(ar[pos])) & 0x01) * 0x80 ); - } + // Generate (encrypted) nr+parity by loading it into the cipher (Nr) + par[0] = 0; + for (pos = 0; pos < 4; pos++) + { + mf_nr_ar[pos] = crypto1_byte(pcs, nr[pos], 0) ^ nr[pos]; + par[0] |= (((filter(pcs->odd) ^ oddparity(nr[pos])) & 0x01) << (7-pos)); + } - // Skip 32 bits in pseudo random generator - nt = prng_successor(nt,32); + // Skip 32 bits in pseudo random generator + nt = prng_successor(nt,32); // ar+parity - for (pos = 4; pos < 8; pos++) - { + for (pos = 4; pos < 8; pos++) + { nt = prng_successor(nt,8); - mf_nr_ar[pos] = crypto1_byte(pcs,0x00,0) ^ (nt & 0xff); - par = (par >> 1)| ( ((filter(pcs->odd) ^ oddparity(nt & 0xff)) & 0x01) * 0x80 ); - } + mf_nr_ar[pos] = crypto1_byte(pcs,0x00,0) ^ (nt & 0xff); + par[0] |= (((filter(pcs->odd) ^ oddparity(nt & 0xff)) & 0x01) << (7-pos)); + } - // Transmit reader nonce and reader answer - ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par); - - // Receive 4 bit answer - len = ReaderReceive(receivedAnswer); - if (!len) - { - Dbprintf("Authentication failed. Card timeout."); + // Transmit reader nonce and reader answer + ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par, NULL); + + // Receive 4 byte tag answer + len = ReaderReceive(receivedAnswer, receivedAnswerPar); + if (!len) + { + if (MF_DBGLEVEL >= 1) Dbprintf("Authentication failed. Card timeout."); return 2; - } + } - memcpy(tmp4, receivedAnswer, 4); + memcpy(tmp4, receivedAnswer, 4); ntpp = prng_successor(nt, 32) ^ crypto1_word(pcs, 0,0); if (ntpp != bytes_to_num(tmp4, 4)) { - Dbprintf("Authentication failed. Error card response."); + if (MF_DBGLEVEL >= 1) Dbprintf("Authentication failed. Error card response."); return 3; } @@ -147,49 +250,84 @@ int mifare_classic_auth(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, int mifare_classic_readblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData) { // variables - int len; + int len; uint8_t bt[2]; - uint8_t* receivedAnswer = mifare_get_bigbufptr(); + uint8_t* receivedAnswer = get_bigbufptr_recvrespbuf(); + uint8_t* receivedAnswerPar = receivedAnswer + MAX_FRAME_SIZE; - // command MIFARE_CLASSIC_READBLOCK - len = mifare_sendcmd_short(pcs, 1, 0x30, blockNo, receivedAnswer); + // command MIFARE_CLASSIC_READBLOCK + len = mifare_sendcmd_short(pcs, 1, 0x30, blockNo, receivedAnswer, receivedAnswerPar, NULL); if (len == 1) { - Dbprintf("Cmd Error: %02x", receivedAnswer[0]); + if (MF_DBGLEVEL >= 1) Dbprintf("Cmd Error: %02x", receivedAnswer[0]); return 1; } if (len != 18) { - Dbprintf("Cmd Error: card timeout. len: %x", len); + if (MF_DBGLEVEL >= 1) Dbprintf("Cmd Error: card timeout. len: %x", len); return 2; } memcpy(bt, receivedAnswer + 16, 2); - AppendCrc14443a(receivedAnswer, 16); + AppendCrc14443a(receivedAnswer, 16); if (bt[0] != receivedAnswer[16] || bt[1] != receivedAnswer[17]) { - Dbprintf("Cmd CRC response error."); + if (MF_DBGLEVEL >= 1) Dbprintf("Cmd CRC response error."); return 3; } memcpy(blockData, receivedAnswer, 16); - return 0; -} - -int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData) -{ - // variables - int len, i; + return 0; +} + +int mifare_ultra_readblock(uint32_t uid, uint8_t blockNo, uint8_t *blockData) +{ + // variables + uint16_t len; + uint8_t bt[2]; + + uint8_t* receivedAnswer = get_bigbufptr_recvrespbuf(); + uint8_t* receivedAnswerPar = receivedAnswer + MAX_FRAME_SIZE; + + + // command MIFARE_CLASSIC_READBLOCK + len = mifare_sendcmd_short(NULL, 1, 0x30, blockNo, receivedAnswer, receivedAnswerPar, NULL); + if (len == 1) { + if (MF_DBGLEVEL >= 1) Dbprintf("Cmd Error: %02x", receivedAnswer[0]); + return 1; + } + if (len != 18) { + if (MF_DBGLEVEL >= 1) Dbprintf("Cmd Error: card timeout. len: %x", len); + return 2; + } + + memcpy(bt, receivedAnswer + 16, 2); + AppendCrc14443a(receivedAnswer, 16); + if (bt[0] != receivedAnswer[16] || bt[1] != receivedAnswer[17]) { + if (MF_DBGLEVEL >= 1) Dbprintf("Cmd CRC response error."); + return 3; + } + + memcpy(blockData, receivedAnswer, 14); + return 0; +} + + +int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData) +{ + // variables + uint16_t len, i; uint32_t pos; - uint32_t par = 0; - byte_t res; + uint8_t par[3] = {0}; // enough for 18 Bytes to send + byte_t res; uint8_t d_block[18], d_block_enc[18]; - uint8_t* receivedAnswer = mifare_get_bigbufptr(); + uint8_t* receivedAnswer = get_bigbufptr_recvrespbuf(); + uint8_t* receivedAnswerPar = receivedAnswer + MAX_FRAME_SIZE; - // command MIFARE_CLASSIC_WRITEBLOCK - len = mifare_sendcmd_short(pcs, 1, 0xA0, blockNo, receivedAnswer); + // command MIFARE_CLASSIC_WRITEBLOCK + len = mifare_sendcmd_short(pcs, 1, 0xA0, blockNo, receivedAnswer, receivedAnswerPar, NULL); if ((len != 1) || (receivedAnswer[0] != 0x0A)) { // 0x0a - ACK - Dbprintf("Cmd Error: %02x", receivedAnswer[0]); + if (MF_DBGLEVEL >= 1) Dbprintf("Cmd Error: %02x", receivedAnswer[0]); return 1; } @@ -197,43 +335,221 @@ int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t bl AppendCrc14443a(d_block, 16); // crypto - par = 0; - for (pos = 0; pos < 18; pos++) - { - d_block_enc[pos] = crypto1_byte(pcs, 0x00, 0) ^ d_block[pos]; - par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(d_block[pos])) & 0x01) * 0x20000 ); - } + for (pos = 0; pos < 18; pos++) + { + d_block_enc[pos] = crypto1_byte(pcs, 0x00, 0) ^ d_block[pos]; + par[pos>>3] |= (((filter(pcs->odd) ^ oddparity(d_block[pos])) & 0x01) << (7 - (pos&0x0007))); + } - ReaderTransmitPar(d_block_enc, sizeof(d_block_enc), par); + ReaderTransmitPar(d_block_enc, sizeof(d_block_enc), par, NULL); - // Receive the response - len = ReaderReceive(receivedAnswer); + // Receive the response + len = ReaderReceive(receivedAnswer, receivedAnswerPar); res = 0; for (i = 0; i < 4; i++) res |= (crypto1_bit(pcs, 0, 0) ^ BIT(receivedAnswer[0], i)) << i; if ((len != 1) || (res != 0x0A)) { - Dbprintf("Cmd send data2 Error: %02x", res); + if (MF_DBGLEVEL >= 1) Dbprintf("Cmd send data2 Error: %02x", res); return 2; } - return 0; + return 0; +} + +int mifare_ultra_writeblock(uint32_t uid, uint8_t blockNo, uint8_t *blockData) +{ + // variables + uint16_t len; + uint8_t par[3] = {0}; // enough for 18 parity bits + uint8_t d_block[18]; + uint8_t* receivedAnswer = get_bigbufptr_recvrespbuf(); + uint8_t* receivedAnswerPar = receivedAnswer + MAX_FRAME_SIZE; + + // command MIFARE_CLASSIC_WRITEBLOCK + len = mifare_sendcmd_short(NULL, true, 0xA0, blockNo, receivedAnswer, receivedAnswerPar, NULL); + + if ((len != 1) || (receivedAnswer[0] != 0x0A)) { // 0x0a - ACK + if (MF_DBGLEVEL >= 1) Dbprintf("Cmd Addr Error: %02x", receivedAnswer[0]); + return 1; + } + + memset(d_block,'\0',18); + memcpy(d_block, blockData, 16); + AppendCrc14443a(d_block, 16); + + ReaderTransmitPar(d_block, sizeof(d_block), par, NULL); + + // Receive the response + len = ReaderReceive(receivedAnswer, receivedAnswerPar); + + if ((len != 1) || (receivedAnswer[0] != 0x0A)) { // 0x0a - ACK + if (MF_DBGLEVEL >= 1) Dbprintf("Cmd Data Error: %02x %d", receivedAnswer[0],len); + return 2; + } + + return 0; +} + +int mifare_ultra_special_writeblock(uint32_t uid, uint8_t blockNo, uint8_t *blockData) +{ + uint16_t len; + uint8_t d_block[8]; + uint8_t *receivedAnswer = get_bigbufptr_recvrespbuf(); + uint8_t *receivedAnswerPar = receivedAnswer + MAX_FRAME_SIZE; + + // command MIFARE_CLASSIC_WRITEBLOCK + memset(d_block,'\0',8); + d_block[0]= blockNo; + memcpy(d_block+1,blockData,4); + AppendCrc14443a(d_block, 6); + + //i know the data send here is correct + len = mifare_sendcmd_short_special(NULL, 1, 0xA2, d_block, receivedAnswer, receivedAnswerPar, NULL); + + if (receivedAnswer[0] != 0x0A) { // 0x0a - ACK + if (MF_DBGLEVEL >= 1) Dbprintf("Cmd Send Error: %02x %d", receivedAnswer[0],len); + return 1; + } + return 0; +} + +int mifare_classic_halt(struct Crypto1State *pcs, uint32_t uid) +{ + uint16_t len; + uint8_t *receivedAnswer = get_bigbufptr_recvrespbuf(); + uint8_t *receivedAnswerPar = receivedAnswer + MAX_FRAME_SIZE; + + len = mifare_sendcmd_short(pcs, pcs == NULL ? false:true, 0x50, 0x00, receivedAnswer, receivedAnswerPar, NULL); + if (len != 0) { + if (MF_DBGLEVEL >= 1) Dbprintf("halt error. response len: %x", len); + return 1; + } + + return 0; +} + +int mifare_ultra_halt(uint32_t uid) +{ + uint16_t len; + uint8_t *receivedAnswer = get_bigbufptr_recvrespbuf(); + uint8_t *receivedAnswerPar = receivedAnswer + MAX_FRAME_SIZE; + + len = mifare_sendcmd_short(NULL, true, 0x50, 0x00, receivedAnswer, receivedAnswerPar, NULL); + if (len != 0) { + if (MF_DBGLEVEL >= 1) Dbprintf("halt error. response len: %x", len); + return 1; + } + + return 0; +} + + +// Mifare Memory Structure: up to 32 Sectors with 4 blocks each (1k and 2k cards), +// plus evtl. 8 sectors with 16 blocks each (4k cards) +uint8_t NumBlocksPerSector(uint8_t sectorNo) +{ + if (sectorNo < 32) + return 4; + else + return 16; } -int mifare_classic_halt(struct Crypto1State *pcs, uint32_t uid) +uint8_t FirstBlockOfSector(uint8_t sectorNo) { - // variables - int len; - - // Mifare HALT - uint8_t* receivedAnswer = mifare_get_bigbufptr(); + if (sectorNo < 32) + return sectorNo * 4; + else + return 32*4 + (sectorNo - 32) * 16; + +} + + +// work with emulator memory +void emlSetMem(uint8_t *data, int blockNum, int blocksCount) { + uint8_t* emCARD = get_bigbufptr_emlcardmem(); + memcpy(emCARD + blockNum * 16, data, blocksCount * 16); +} + +void emlGetMem(uint8_t *data, int blockNum, int blocksCount) { + uint8_t* emCARD = get_bigbufptr_emlcardmem(); + memcpy(data, emCARD + blockNum * 16, blocksCount * 16); +} + +void emlGetMemBt(uint8_t *data, int bytePtr, int byteCount) { + uint8_t* emCARD = get_bigbufptr_emlcardmem(); + memcpy(data, emCARD + bytePtr, byteCount); +} - len = mifare_sendcmd_short(pcs, 1, 0x50, 0x00, receivedAnswer); - if (len != 0) { - Dbprintf("halt error. response len: %x", len); +int emlCheckValBl(int blockNum) { + uint8_t* emCARD = get_bigbufptr_emlcardmem(); + uint8_t* data = emCARD + blockNum * 16; + + if ((data[0] != (data[4] ^ 0xff)) || (data[0] != data[8]) || + (data[1] != (data[5] ^ 0xff)) || (data[1] != data[9]) || + (data[2] != (data[6] ^ 0xff)) || (data[2] != data[10]) || + (data[3] != (data[7] ^ 0xff)) || (data[3] != data[11]) || + (data[12] != (data[13] ^ 0xff)) || (data[12] != data[14]) || + (data[12] != (data[15] ^ 0xff)) + ) + return 1; + return 0; +} + +int emlGetValBl(uint32_t *blReg, uint8_t *blBlock, int blockNum) { + uint8_t* emCARD = get_bigbufptr_emlcardmem(); + uint8_t* data = emCARD + blockNum * 16; + + if (emlCheckValBl(blockNum)) { return 1; } + + memcpy(blReg, data, 4); + *blBlock = data[12]; + return 0; +} +int emlSetValBl(uint32_t blReg, uint8_t blBlock, int blockNum) { + uint8_t* emCARD = get_bigbufptr_emlcardmem(); + uint8_t* data = emCARD + blockNum * 16; + + memcpy(data + 0, &blReg, 4); + memcpy(data + 8, &blReg, 4); + blReg = blReg ^ 0xffffffff; + memcpy(data + 4, &blReg, 4); + + data[12] = blBlock; + data[13] = blBlock ^ 0xff; + data[14] = blBlock; + data[15] = blBlock ^ 0xff; + return 0; } + +uint64_t emlGetKey(int sectorNum, int keyType) { + uint8_t key[6]; + uint8_t* emCARD = get_bigbufptr_emlcardmem(); + + memcpy(key, emCARD + 16 * (FirstBlockOfSector(sectorNum) + NumBlocksPerSector(sectorNum) - 1) + keyType * 10, 6); + return bytes_to_num(key, 6); +} + +void emlClearMem(void) { + int b; + + const uint8_t trailer[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x07, 0x80, 0x69, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; + const uint8_t uid[] = {0xe6, 0x84, 0x87, 0xf3, 0x16, 0x88, 0x04, 0x00, 0x46, 0x8e, 0x45, 0x55, 0x4d, 0x70, 0x41, 0x04}; + uint8_t* emCARD = get_bigbufptr_emlcardmem(); + + memset(emCARD, 0, CARD_MEMORY_SIZE); + + // fill sectors trailer data + for(b = 3; b < 256; b<127?(b+=4):(b+=16)) { + emlSetMem((uint8_t *)trailer, b , 1); + } + + // uid + emlSetMem((uint8_t *)uid, 0, 1); + return; +}