flipperzero-firmware/lib/nfc_protocols/mifare_ultralight.c

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#include "mifare_ultralight.h"
bool mf_ul_check_card_type(uint8_t ATQA0, uint8_t ATQA1, uint8_t SAK) {
if((ATQA0 == 0x44) && (ATQA1 == 0x00) && (SAK == 0x00)) {
return true;
}
return false;
}
uint16_t mf_ul_prepare_get_version(uint8_t* dest) {
dest[0] = MF_UL_GET_VERSION_CMD;
return 1;
}
void mf_ul_parse_get_version_response(uint8_t* buff, MifareUlDevice* mf_ul_read) {
MfUltralightVersion* version = (MfUltralightVersion*) buff;
memcpy(&mf_ul_read->data.version, version, sizeof(MfUltralightVersion));
if(version->storage_size == 0x0B || version->storage_size == 0x00) {
mf_ul_read->type = MfUltralightTypeUL11;
mf_ul_read->pages_to_read = 20;
mf_ul_read->support_fast_read = true;
} else if(version->storage_size == 0x0E) {
mf_ul_read->type = MfUltralightTypeUL21;
mf_ul_read->pages_to_read = 41;
mf_ul_read->support_fast_read = true;
} else if(version->storage_size == 0x0F) {
mf_ul_read->type = MfUltralightTypeNTAG213;
mf_ul_read->pages_to_read = 45;
mf_ul_read->support_fast_read = false;
} else if(version->storage_size == 0x11) {
mf_ul_read->type = MfUltralightTypeNTAG215;
mf_ul_read->pages_to_read = 135;
mf_ul_read->support_fast_read = false;
} else if(version->storage_size == 0x13) {
mf_ul_read->type = MfUltralightTypeNTAG216;
mf_ul_read->pages_to_read = 231;
mf_ul_read->support_fast_read = false;
} else {
mf_ul_set_default_version(mf_ul_read);
}
}
void mf_ul_set_default_version(MifareUlDevice* mf_ul_read) {
mf_ul_read->type = MfUltralightTypeUnknown;
mf_ul_read->pages_to_read = 16;
mf_ul_read->support_fast_read = false;
}
uint16_t mf_ul_prepare_read(uint8_t* dest, uint8_t start_page) {
dest[0] = MF_UL_READ_CMD;
dest[1] = start_page;
return 2;
}
void mf_ul_parse_read_response(uint8_t* buff, uint16_t page_addr, MifareUlDevice* mf_ul_read) {
uint8_t pages_read = 4;
uint8_t page_read_count = mf_ul_read->pages_readed + pages_read;
if(page_read_count > mf_ul_read->pages_to_read) {
pages_read -= page_read_count - mf_ul_read->pages_to_read;
}
mf_ul_read->pages_readed += pages_read;
mf_ul_read->data.data_size = mf_ul_read->pages_readed * 4;
memcpy(&mf_ul_read->data.data[page_addr * 4], buff, pages_read * 4);
}
uint16_t mf_ul_prepare_fast_read(uint8_t* dest, uint8_t start_page, uint8_t end_page) {
dest[0] = MF_UL_FAST_READ_CMD;
dest[1] = start_page;
dest[2] = end_page;
return 3;
}
void mf_ul_parse_fast_read_response(uint8_t* buff, uint8_t start_page, uint8_t end_page, MifareUlDevice* mf_ul_read) {
mf_ul_read->pages_readed = end_page - start_page + 1;
mf_ul_read->data.data_size = mf_ul_read->pages_readed * 4;
memcpy(mf_ul_read->data.data, buff, mf_ul_read->data.data_size);
}
uint16_t mf_ul_prepare_read_signature(uint8_t* dest) {
dest[0] = MF_UL_READ_SIG;
dest[1] = 0;
return 2;
}
void mf_ul_parse_read_signature_response(uint8_t* buff, MifareUlDevice* mf_ul_read) {
memcpy(mf_ul_read->data.signature, buff, sizeof(mf_ul_read->data.signature));
}
uint16_t mf_ul_prepare_read_cnt(uint8_t* dest, uint8_t cnt_index) {
if(cnt_index > 2) {
return 0;
}
dest[0] = MF_UL_READ_CNT;
dest[1] = cnt_index;
return 2;
}
void mf_ul_parse_read_cnt_response(uint8_t* buff, uint8_t cnt_index, MifareUlDevice* mf_ul_read) {
// Reverse LSB sequence
if(cnt_index < 3) {
mf_ul_read->data.counter[cnt_index] = (buff[2] << 16) | (buff[1] << 8) | (buff[0]);
}
}
uint16_t mf_ul_prepare_inc_cnt(uint8_t* dest, uint8_t cnt_index, uint32_t value) {
if(cnt_index > 2) {
return 0;
}
dest[0] = MF_UL_INC_CNT;
dest[1] = cnt_index;
dest[2] = (uint8_t) value;
dest[3] = (uint8_t) (value >> 8);
dest[4] = (uint8_t) (value >> 16);
dest[5] = 0;
return 6;
}
uint16_t mf_ul_prepare_check_tearing(uint8_t* dest, uint8_t cnt_index) {
if(cnt_index > 2) {
return 0;
}
dest[0] = MF_UL_CHECK_TEARING;
dest[1] = cnt_index;
return 2;
}
void mf_ul_parse_check_tearing_response(uint8_t* buff, uint8_t cnt_index, MifareUlDevice* mf_ul_read) {
if(cnt_index < 2) {
mf_ul_read->data.tearing[cnt_index] = buff[0];
}
}
uint16_t mf_ul_prepare_write(uint8_t* dest, uint16_t page_addr, uint32_t data) {
if(page_addr < 2) {
return 0;
}
dest[0] = MF_UL_WRITE;
dest[1] = page_addr;
dest[2] = (uint8_t) (data >> 24);
dest[3] = (uint8_t) (data >> 16);
dest[4] = (uint8_t) (data >> 8);
dest[5] = (uint8_t) data;
return 6;
}
void mf_ul_prepare_emulation(MifareUlDevice* mf_ul_emulate, MifareUlData* data) {
mf_ul_emulate->data = *data;
mf_ul_emulate->auth_data = NULL;
mf_ul_emulate->data_changed = false;
if(data->version.storage_size == 0) {
mf_ul_emulate->type = MfUltralightTypeUnknown;
mf_ul_emulate->support_fast_read = false;
} else if(data->version.storage_size == 0x0B) {
mf_ul_emulate->type = MfUltralightTypeUL11;
mf_ul_emulate->support_fast_read = true;
} else if(data->version.storage_size == 0x0E) {
mf_ul_emulate->type = MfUltralightTypeUL21;
mf_ul_emulate->support_fast_read = true;
} else if(data->version.storage_size == 0x0F) {
mf_ul_emulate->type = MfUltralightTypeNTAG213;
mf_ul_emulate->support_fast_read = true;
} else if(data->version.storage_size == 0x11) {
mf_ul_emulate->type = MfUltralightTypeNTAG215;
mf_ul_emulate->support_fast_read = true;
} else if(data->version.storage_size == 0x13) {
mf_ul_emulate->type = MfUltralightTypeNTAG216;
mf_ul_emulate->support_fast_read = true;
}
if(mf_ul_emulate->type >= MfUltralightTypeNTAG213) {
uint16_t pwd_page = (data->data_size / 4) - 2;
mf_ul_emulate->auth_data = (MifareUlAuthData*)&data->data[pwd_page * 4];
}
}
void mf_ul_protect_auth_data_on_read_command(
uint8_t* tx_buff,
uint8_t start_page,
uint8_t end_page,
MifareUlDevice* mf_ul_emulate) {
if(mf_ul_emulate->type >= MfUltralightTypeNTAG213) {
uint8_t pwd_page = (mf_ul_emulate->data.data_size / 4) - 2;
uint8_t pack_page = pwd_page + 1;
if((start_page <= pwd_page) && (end_page >= pwd_page)) {
memset(&tx_buff[(pwd_page - start_page) * 4], 0, 4);
}
if((start_page <= pack_page) && (end_page >= pack_page)) {
memset(&tx_buff[(pack_page - start_page) * 4], 0, 2);
}
}
}
uint16_t mf_ul_prepare_emulation_response(uint8_t* buff_rx, uint16_t len_rx, uint8_t* buff_tx, MifareUlDevice* mf_ul_emulate) {
uint8_t cmd = buff_rx[0];
uint16_t page_num = mf_ul_emulate->data.data_size / 4;
uint16_t tx_len = 0;
if(cmd == MF_UL_GET_VERSION_CMD) {
if(mf_ul_emulate->type != MfUltralightTypeUnknown) {
tx_len = sizeof(mf_ul_emulate->data.version);
memcpy(buff_tx, &mf_ul_emulate->data.version, tx_len);
}
} else if(cmd == MF_UL_READ_CMD) {
uint8_t start_page = buff_rx[1];
if(start_page < page_num) {
tx_len = 16;
if(start_page + 4 > page_num) {
// Handle roll-over mechanism
uint8_t end_pages_num = page_num - start_page;
memcpy(buff_tx, &mf_ul_emulate->data.data[start_page * 4], end_pages_num * 4);
memcpy(&buff_tx[end_pages_num * 4], mf_ul_emulate->data.data, (4 - end_pages_num) * 4);
} else {
memcpy(buff_tx, &mf_ul_emulate->data.data[start_page * 4], tx_len);
}
mf_ul_protect_auth_data_on_read_command(
buff_tx, start_page, (start_page + 4), mf_ul_emulate);
}
} else if(cmd == MF_UL_FAST_READ_CMD) {
if(mf_ul_emulate->support_fast_read) {
uint8_t start_page = buff_rx[1];
uint8_t end_page = buff_rx[2];
if((start_page < page_num) &&
(end_page < page_num) && (start_page < (end_page + 1))) {
tx_len = ((end_page + 1) - start_page) * 4;
memcpy(buff_tx, &mf_ul_emulate->data.data[start_page * 4], tx_len);
mf_ul_protect_auth_data_on_read_command(
buff_tx, start_page, end_page, mf_ul_emulate);
} else {
// TODO make 4-bit NAK
buff_tx[0] = 0x0;
tx_len = 1;
}
}
} else if(cmd == MF_UL_WRITE) {
uint8_t write_page = buff_rx[1];
if((write_page > 1) && (write_page < page_num - 2)) {
memcpy(&mf_ul_emulate->data.data[write_page * 4], &buff_rx[2], 4);
mf_ul_emulate->data_changed = true;
// TODO make 4-bit ACK
buff_tx[0] = 0x0A;
tx_len = 1;
}
} else if(cmd == MF_UL_READ_CNT) {
uint8_t cnt_num = buff_rx[1];
if(cnt_num < 3) {
buff_tx[0] = mf_ul_emulate->data.counter[cnt_num] >> 16;
buff_tx[1] = mf_ul_emulate->data.counter[cnt_num] >> 8;
buff_tx[2] = mf_ul_emulate->data.counter[cnt_num];
tx_len = 3;
}
} else if(cmd == MF_UL_INC_CNT) {
uint8_t cnt_num = buff_rx[1];
uint32_t inc = (buff_rx[2] | (buff_rx[3] << 8) | (buff_rx[4] << 16));
if((cnt_num < 3) && (mf_ul_emulate->data.counter[cnt_num] + inc < 0x00FFFFFF)) {
mf_ul_emulate->data.counter[cnt_num] += inc;
mf_ul_emulate->data_changed = true;
// TODO make 4-bit ACK
buff_tx[0] = 0x0A;
tx_len = 1;
}
} else if(cmd == MF_UL_AUTH) {
if(mf_ul_emulate->type >= MfUltralightTypeNTAG213) {
if(memcmp(&buff_rx[1], mf_ul_emulate->auth_data->pwd, 4) == 0) {
buff_tx[0] = mf_ul_emulate->auth_data->pack.raw[0];
buff_tx[1] = mf_ul_emulate->auth_data->pack.raw[1];
tx_len = 2;
} else if(!mf_ul_emulate->auth_data->pack.value) {
buff_tx[0] = 0x80;
buff_tx[1] = 0x80;
tx_len = 2;
} else {
// TODO make 4-bit NAK
buff_tx[0] = 0x0;
tx_len = 1;
}
}
} else if(cmd == MF_UL_READ_SIG) {
// Check 2nd byte = 0x00 - RFU
if(buff_rx[1] == 0x00) {
tx_len = sizeof(mf_ul_emulate->data.signature);
memcpy(buff_tx, mf_ul_emulate->data.signature, tx_len);
}
} else if(cmd == MF_UL_CHECK_TEARING) {
uint8_t cnt_num = buff_rx[1];
if(cnt_num < 3) {
buff_tx[0] = mf_ul_emulate->data.tearing[cnt_num];
tx_len = 1;
}
}
return tx_len;
}