//-----------------------------------------------------------------------------
// Copyright (C) 2017 Merlok
//
// 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.
//-----------------------------------------------------------------------------
// EMV core functions
//-----------------------------------------------------------------------------

#include "emvcore.h"
#include "emvjson.h"
#include "util_posix.h"

// Got from here. Thanks)
// https://eftlab.co.uk/index.php/site-map/knowledge-base/211-emv-aid-rid-pix
static const char *PSElist [] = { 
	"325041592E5359532E4444463031", // 2PAY.SYS.DDF01 - Visa Proximity Payment System Environment - PPSE
	"315041592E5359532E4444463031"  // 1PAY.SYS.DDF01 - Visa Payment System Environment - PSE
};
//static const size_t PSElistLen = sizeof(PSElist)/sizeof(char*);

char *TransactionTypeStr[] = {
	"MSD",
	"VSDC",
	"qVCDCMCHIP",
	"CDA"
};

typedef struct {
	enum CardPSVendor vendor;
	const char* aid;
} TAIDList;

static const TAIDList AIDlist [] = { 
	// Visa International
	{ CV_VISA, 	"A00000000305076010"},			// VISA ELO Credit	
	{ CV_VISA, 	"A0000000031010" },				// VISA Debit/Credit (Classic)	
	{ CV_VISA, 	"A000000003101001" },			// VISA Credit	
	{ CV_VISA, 	"A000000003101002" },			// VISA Debit	
	{ CV_VISA, 	"A0000000032010" },				// VISA Electron
	{ CV_VISA, 	"A0000000032020" },				// VISA	
	{ CV_VISA, 	"A0000000033010" },				// VISA Interlink	
	{ CV_VISA, 	"A0000000034010" },				// VISA Specific	
	{ CV_VISA, 	"A0000000035010" },				// VISA Specific	
	{ CV_VISA, 	"A0000000036010" },				// Domestic Visa Cash Stored Value	
	{ CV_VISA, 	"A0000000036020" },				// International Visa Cash Stored Value	
	{ CV_VISA, 	"A0000000038002" },				// VISA Auth, VisaRemAuthen EMV-CAP (DPA)	
	{ CV_VISA, 	"A0000000038010" },				// VISA Plus	
	{ CV_VISA, 	"A0000000039010" },				// VISA Loyalty	
	{ CV_VISA, 	"A000000003999910" },			// VISA Proprietary ATM	
	// Visa USA
	{ CV_VISA, 	"A000000098" },					// Debit Card
	{ CV_VISA, 	"A0000000980848" },				// Debit Card
	// Mastercard International
	{ CV_MASTERCARD, "A00000000401" },			// MasterCard PayPass	
	{ CV_MASTERCARD, "A0000000041010" },		// MasterCard Credit
	{ CV_MASTERCARD, "A00000000410101213" },	// MasterCard Credit
	{ CV_MASTERCARD, "A00000000410101215" },	// MasterCard Credit
	{ CV_MASTERCARD, "A0000000042010" },		// MasterCard Specific
	{ CV_MASTERCARD, "A0000000043010" },		// MasterCard Specific
	{ CV_MASTERCARD, "A0000000043060" },		// Maestro (Debit)
	{ CV_MASTERCARD, "A000000004306001" },		// Maestro (Debit)
	{ CV_MASTERCARD, "A0000000044010" },		// MasterCard Specific
	{ CV_MASTERCARD, "A0000000045010" },		// MasterCard Specific
	{ CV_MASTERCARD, "A0000000046000" },		// Cirrus
	{ CV_MASTERCARD, "A0000000048002" },		// SecureCode Auth EMV-CAP
	{ CV_MASTERCARD, "A0000000049999" },		// MasterCard PayPass	
	// American Express
	{ CV_AMERICANEXPRESS, "A000000025" },
	{ CV_AMERICANEXPRESS, "A0000000250000" },
	{ CV_AMERICANEXPRESS, "A00000002501" },
	{ CV_AMERICANEXPRESS, "A000000025010402" },
	{ CV_AMERICANEXPRESS, "A000000025010701" },
	{ CV_AMERICANEXPRESS, "A000000025010801" },
	// Groupement des Cartes Bancaires "CB"
	{ CV_CB, "A0000000421010" },				// Cartes Bancaire EMV Card	
	{ CV_CB, "A0000000422010" },		
	{ CV_CB, "A0000000423010" },		
	{ CV_CB, "A0000000424010" },		
	{ CV_CB, "A0000000425010" },		
	// JCB CO., LTD.
	{ CV_JCB, "A00000006510" },					// JCB	
	{ CV_JCB, "A0000000651010" },				// JCB J Smart Credit	
	// Other
	{ CV_OTHER, "A0000001544442" },				// Banricompras Debito - Banrisul - Banco do Estado do Rio Grande do SUL - S.A.
	{ CV_OTHER, "F0000000030001" },				// BRADESCO
	{ CV_OTHER, "A0000005241010" },				// RuPay - RuPay
	{ CV_OTHER, "D5780000021010" }				// Bankaxept - Bankaxept
};
static const size_t AIDlistLen = sizeof(AIDlist)/sizeof(TAIDList);

static bool APDULogging = false;
void SetAPDULogging(bool logging) {
	APDULogging = logging;
}

enum CardPSVendor GetCardPSVendor(uint8_t * AID, size_t AIDlen) {
	char buf[100] = {0};
	if (AIDlen < 1)
		return CV_NA;

	hex_to_buffer((uint8_t *)buf, AID, AIDlen, sizeof(buf) - 1, 0, 0, true);

	for(int i = 0; i < AIDlistLen; i ++) {
		if (strncmp(AIDlist[i].aid, buf, strlen(AIDlist[i].aid)) == 0){
			return AIDlist[i].vendor;
		}
	}	
	
	return CV_NA;
}

static bool print_cb(void *data, const struct tlv *tlv, int level, bool is_leaf) {
	emv_tag_dump(tlv, stdout, level);
	if (is_leaf) {
		dump_buffer(tlv->value, tlv->len, stdout, level);
	}

	return true;
}

bool TLVPrintFromBuffer(uint8_t *data, int datalen) {
	struct tlvdb *t = NULL;
	t = tlvdb_parse_multi(data, datalen);
	if (t) {
		PrintAndLogEx(NORMAL, "-------------------- TLV decoded --------------------");
		
		tlvdb_visit(t, print_cb, NULL, 0);
		tlvdb_free(t);
		return true;
	} else {
		PrintAndLogEx(WARNING, "TLV ERROR: Can't parse response as TLV tree.");
	}
	return false;
}

void TLVPrintFromTLVLev(struct tlvdb *tlv, int level) {
	if (!tlv) 
		return;
	
	tlvdb_visit(tlv, print_cb, NULL, level);
}

void TLVPrintFromTLV(struct tlvdb *tlv) {
	TLVPrintFromTLVLev(tlv, 0);
}

void TLVPrintAIDlistFromSelectTLV(struct tlvdb *tlv) {
	PrintAndLogEx(NORMAL, "|------------------|--------|-------------------------|");
	PrintAndLogEx(NORMAL, "|    AID           |Priority| Name                    |");
	PrintAndLogEx(NORMAL, "|------------------|--------|-------------------------|");

	struct tlvdb *ttmp = tlvdb_find(tlv, 0x6f);
	if (!ttmp)
		PrintAndLogEx(NORMAL, "|                         none                        |");
		
	while (ttmp) {
		const struct tlv *tgAID = tlvdb_get_inchild(ttmp, 0x84, NULL);
		const struct tlv *tgName = tlvdb_get_inchild(ttmp, 0x50, NULL);
		const struct tlv *tgPrio = tlvdb_get_inchild(ttmp, 0x87, NULL);
		if (!tgAID)
			break;
		PrintAndLogEx(NORMAL, "|%s|   %s  |%s|", 
			sprint_hex_inrow_ex(tgAID->value, tgAID->len, 18), 
			(tgPrio) ? sprint_hex(tgPrio->value, 1) : "   ", 
			(tgName) ? sprint_ascii_ex(tgName->value, tgName->len, 25) : "                         ");
		
		ttmp = tlvdb_find_next(ttmp, 0x6f);
	}

	PrintAndLogEx(NORMAL, "|------------------|--------|-------------------------|");
}

struct tlvdb *GetPANFromTrack2(const struct tlv *track2) {
	char track2Hex[200] = {0};
	uint8_t PAN[100] = {0};
	int PANlen = 0;
	char *tmp = track2Hex;

	if (!track2)
		return NULL;

	for (int i = 0; i < track2->len; ++i, tmp += 2)
		sprintf(tmp, "%02x", (unsigned int)track2->value[i]);
	
	int posD = strchr(track2Hex, 'd') - track2Hex;
	if (posD < 1)
		return NULL;
	
	track2Hex[posD] = 0;
	if (strlen(track2Hex) % 2) {
		track2Hex[posD] = 'F';
		track2Hex[posD + 1] = '\0';
	}
	
	param_gethex_to_eol(track2Hex, 0, PAN, sizeof(PAN), &PANlen);
	
  return tlvdb_fixed(0x5a, PANlen, PAN);
}

struct tlvdb *GetdCVVRawFromTrack2(const struct tlv *track2) {
	char track2Hex[200] = {0};
	char dCVVHex[100] = {0};
	uint8_t dCVV[100] = {0};
	int dCVVlen = 0;
	const int PINlen = 5; // must calculated from 9F67 MSD Offset but i have not seen this tag)
	char *tmp = track2Hex;
	
	if (!track2)
		return NULL;
	
	for (int i = 0; i < track2->len; ++i, tmp += 2)
		sprintf(tmp, "%02x", (unsigned int)track2->value[i]);
	
	int posD = strchr(track2Hex, 'd') - track2Hex;
	if (posD < 1)
		return NULL;

	memset(dCVVHex, '0', 32);
	// ATC
	memcpy(dCVVHex + 0, track2Hex + posD + PINlen + 11, 4);
	// PAN 5 hex
	memcpy(dCVVHex + 4, track2Hex, 5);
	// expire date
	memcpy(dCVVHex + 9, track2Hex + posD + 1, 4);
	// service code
	memcpy(dCVVHex + 13, track2Hex + posD + 5, 3);
	
	param_gethex_to_eol(dCVVHex, 0, dCVV, sizeof(dCVV), &dCVVlen);
	
  return tlvdb_fixed(0x02, dCVVlen, dCVV);
}

int EMVExchangeEx(EMVCommandChannel channel, bool ActivateField, bool LeaveFieldON, sAPDU apdu, bool IncludeLe, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw, struct tlvdb *tlv) {
	uint8_t data[APDU_RES_LEN] = {0};

	*ResultLen = 0;
	if (sw)	*sw = 0;
	uint16_t isw = 0;
	int res = 0;
	
	if (ActivateField) {
		DropField();
		msleep(50);
	}
	
	// COMPUTE APDU
	memcpy(data, &apdu, 5);
	if (apdu.data)
		memcpy(&data[5], apdu.data, apdu.Lc);
	
	if (APDULogging)
		PrintAndLogEx(SUCCESS, ">>>> %s", sprint_hex(data, (IncludeLe?6:5) + apdu.Lc));

	switch(channel) {
	case ECC_CONTACTLESS:
		// 6 byes + data = INS + CLA + P1 + P2 + Lc + <data = Nc> + Le(?IncludeLe)
		res = ExchangeAPDU14a(data, (IncludeLe?6:5) + apdu.Lc, ActivateField, LeaveFieldON, Result, (int)MaxResultLen, (int *)ResultLen);
		if (res) {
			return res;
		}
		break;
	case ECC_CONTACT:
		//int ExchangeAPDUSC(uint8_t *datain, int datainlen, bool activateCard, bool leaveSignalON, uint8_t *dataout, int maxdataoutlen, int *dataoutlen);
		res = ExchangeAPDUSC(data, (IncludeLe?6:5) + apdu.Lc, ActivateField, LeaveFieldON, Result, (int)MaxResultLen, (int *)ResultLen);
		if (res) {
			return res;
		}
		break;
	}
	
	if (APDULogging)
		PrintAndLogEx(SUCCESS, "<<<< %s", sprint_hex(Result, *ResultLen));

	if (*ResultLen < 2) {
		return 200;
	}
	
	*ResultLen -= 2;
	isw = Result[*ResultLen] * 0x0100 + Result[*ResultLen + 1];
	if (sw)
		*sw = isw;

	if (isw != 0x9000) {
		if (APDULogging) {
			if (*sw >> 8 == 0x61) {
				PrintAndLogEx(ERR, "APDU chaining len:%02x -->", *sw & 0xff);
			} else {
				PrintAndLogEx(ERR, "APDU(%02x%02x) ERROR: [%4X] %s", apdu.CLA, apdu.INS, isw, GetAPDUCodeDescription(*sw >> 8, *sw & 0xff));
				return 5;
			}
		}
	}

	// add to tlv tree
	if (tlv) {
		struct tlvdb *t = tlvdb_parse_multi(Result, *ResultLen);
		tlvdb_add(tlv, t);
	}
	
	return 0;
}

int EMVExchange(EMVCommandChannel channel, bool LeaveFieldON, sAPDU apdu, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw, struct tlvdb *tlv) {
	return EMVExchangeEx(channel, false, LeaveFieldON, apdu, (channel == ECC_CONTACTLESS), Result, MaxResultLen, ResultLen, sw, tlv);
}

int EMVSelect(EMVCommandChannel channel, bool ActivateField, bool LeaveFieldON, uint8_t *AID, size_t AIDLen, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw, struct tlvdb *tlv) {
	return EMVExchangeEx(channel, ActivateField, LeaveFieldON, (sAPDU){0x00, 0xa4, 0x04, 0x00, AIDLen, AID}, (channel == ECC_CONTACTLESS), Result, MaxResultLen, ResultLen, sw, tlv);
}

int EMVSelectPSE(EMVCommandChannel channel, bool ActivateField, bool LeaveFieldON, uint8_t PSENum, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw) {
	uint8_t buf[APDU_AID_LEN] = {0};
	*ResultLen = 0;
	int len = 0;
	int res = 0;
	switch (PSENum) {
		case 1:
			param_gethex_to_eol(PSElist[1], 0, buf, sizeof(buf), &len);
			break;
		case 2:
			param_gethex_to_eol(PSElist[0], 0, buf, sizeof(buf), &len);
			break;
		default:
			return -1;
	}
	
	// select
	res = EMVSelect(channel, ActivateField, LeaveFieldON, buf, len, Result, MaxResultLen, ResultLen, sw, NULL);

	return res;
}

int EMVSearchPSE(EMVCommandChannel channel, bool ActivateField, bool LeaveFieldON, uint8_t PSENum, bool decodeTLV, struct tlvdb *tlv) {
	uint8_t data[APDU_RES_LEN] = {0};
	size_t datalen = 0;
	uint8_t sfidata[APDU_RES_LEN] = {0};
	size_t sfidatalen = 0;
	uint16_t sw = 0;
	int res;

	// select PPSE
	res = EMVSelectPSE(channel, ActivateField, true, PSENum, data, sizeof(data), &datalen, &sw);

	if (!res){
		if (sw != 0x9000) {
			PrintAndLogEx(FAILED, "Select PSE error. APDU error: %04x.", sw);
			return 1;
		}
		
		struct tlvdb *t = NULL;
		t = tlvdb_parse_multi(data, datalen);
		if (t) {
			struct tlvdb *tsfi = tlvdb_find_path(t, (tlv_tag_t[]){0x6f, 0xa5, 0x88, 0x00});
			if (tsfi) {
				const struct tlv *tsfi_tlv = tlvdb_get_tlv(tsfi);
				uint8_t sfin = tsfi_tlv->value[0];
				PrintAndLogEx(INFO, "* PPSE get SFI: 0x%02x.", sfin);
				
				for (uint8_t ui = 0x01; ui <= 0x10; ui++) {
					PrintAndLogEx(INFO, "* * Get SFI: 0x%02x. num: 0x%02x", sfin, ui);
					res = EMVReadRecord(channel, true, sfin, ui, sfidata, sizeof(sfidata), &sfidatalen, &sw, NULL);
					
					// end of records
					if (sw == 0x6a83) {
						PrintAndLogEx(INFO, "* * PPSE get SFI. End of records.");
						break;
					}
					
					// here must bee an error catch!
					if (sw != 0x9000) {
						PrintAndLogEx(FAILED, "PPSE get Error. APDU error: %04x.", sw);
						break;
					}

					if (decodeTLV){
						TLVPrintFromBuffer(sfidata, sfidatalen);
					}
					
				}
				
				
			}



			int retrycnt = 0;
			struct tlvdb *ttmp = tlvdb_find_path(t, (tlv_tag_t[]){0x6f, 0xa5, 0xbf0c, 0x61, 0x00});
			if (!ttmp)
				PrintAndLogEx(FAILED, "PPSE don't have records.");
			
			while (ttmp) {
				const struct tlv *tgAID = tlvdb_get_inchild(ttmp, 0x4f, NULL);
				if (tgAID) {
					res = EMVSelect(channel, false, true, (uint8_t *)tgAID->value, tgAID->len, data, sizeof(data), &datalen, &sw, tlv);

					// retry if error and not returned sw error
					if (res && res != 5) {
						if (++retrycnt < 3){
							continue;
						} else {
							// card select error, proxmark error
							if (res == 1) {
								PrintAndLogEx(WARNING, "Exit...");
								return 1;
							}
							
							retrycnt = 0;
							PrintAndLogEx(NORMAL, "Retry failed [%s]. Skiped...", sprint_hex_inrow(tgAID->value, tgAID->len));
						}
						
						// next element
						ttmp = tlvdb_find_next(ttmp, 0x61);
						continue;
					}
					retrycnt = 0;

					// all is ok
					if (decodeTLV){
						PrintAndLogEx(NORMAL, "%s:", sprint_hex_inrow(tgAID->value, tgAID->len));
						TLVPrintFromBuffer(data, datalen);
					}
				}
				
				ttmp = tlvdb_find_next(ttmp, 0x61);
			}

			tlvdb_free(t);
		} else {
			PrintAndLogEx(WARNING, "PPSE ERROR: Can't get TLV from response.");
		}		
	} else {
		PrintAndLogEx(WARNING, "PPSE ERROR: Can't select PPSE AID. Error: %d", res);
	}
	
	if(!LeaveFieldON)
		DropField();
	
	return res;
}

int EMVSearch(EMVCommandChannel channel, bool ActivateField, bool LeaveFieldON, bool decodeTLV, struct tlvdb *tlv) {
	uint8_t aidbuf[APDU_AID_LEN] = {0};
	int aidlen = 0;
	uint8_t data[APDU_RES_LEN] = {0};
	size_t datalen = 0;
	uint16_t sw = 0;
	
	int res = 0;
	int retrycnt = 0;
	for(int i = 0; i < AIDlistLen; i ++) {
		param_gethex_to_eol(AIDlist[i].aid, 0, aidbuf, sizeof(aidbuf), &aidlen);
		res = EMVSelect(channel, (i == 0) ? ActivateField : false, (i == AIDlistLen - 1) ? LeaveFieldON : true, aidbuf, aidlen, data, sizeof(data), &datalen, &sw, tlv);
		// retry if error and not returned sw error
		if (res && res != 5) {
			if (++retrycnt < 3){
				i--;
			} else {
				// (1) - card select error, proxmark error OR (200) - result length = 0
				if (res == 1 || res == 200) {
					PrintAndLogEx(WARNING, "Exit...");
					return 1;
				}
				
				retrycnt = 0;
				PrintAndLogEx(FAILED, "Retry failed [%s]. Skipped...", AIDlist[i].aid);
			}
			continue;
		}
		retrycnt = 0;
		
		if (res)
			continue;
		
		if (!datalen)
			continue;
		
		if (decodeTLV) {
			PrintAndLogEx(SUCCESS, "%s", AIDlist[i].aid);
			TLVPrintFromBuffer(data, datalen);
		}
	}

	return 0;
}

int EMVSelectApplication(struct tlvdb *tlv, uint8_t *AID, size_t *AIDlen) {
	// check priority. 0x00 - highest
	int prio = 0xffff;
	
	*AIDlen = 0;

	struct tlvdb *ttmp = tlvdb_find(tlv, 0x6f);
	if (!ttmp)
		return 1;
		
	while (ttmp) {
		const struct tlv *tgAID = tlvdb_get_inchild(ttmp, 0x84, NULL);
		const struct tlv *tgPrio = tlvdb_get_inchild(ttmp, 0x87, NULL);
		
		if (!tgAID)
			break;

		if (tgPrio) {
			int pt = bytes_to_num((uint8_t*)tgPrio->value, (tgPrio->len < 2) ? tgPrio->len : 2); 
			if (pt < prio) {
				prio = pt;
				
				memcpy(AID, tgAID->value, tgAID->len);
				*AIDlen = tgAID->len;
			}
		} else {
			// takes the first application from list wo priority
			if (!*AIDlen) {
			memcpy(AID, tgAID->value, tgAID->len);
			*AIDlen = tgAID->len;				
			}
		}
		
		ttmp = tlvdb_find_next(ttmp, 0x6f);
	}
	
	return 0;
}

int EMVGPO(EMVCommandChannel channel, bool LeaveFieldON, uint8_t *PDOL, size_t PDOLLen, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw, struct tlvdb *tlv) {
	return EMVExchange(channel, LeaveFieldON, (sAPDU){0x80, 0xa8, 0x00, 0x00, PDOLLen, PDOL}, Result, MaxResultLen, ResultLen, sw, tlv);
}

int EMVReadRecord(EMVCommandChannel channel, bool LeaveFieldON, uint8_t SFI, uint8_t SFIrec, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw, struct tlvdb *tlv) {
	int res = EMVExchange(channel, LeaveFieldON, (sAPDU){0x00, 0xb2, SFIrec, (SFI << 3) | 0x04, 0, NULL}, Result, MaxResultLen, ResultLen, sw, tlv);
	if (*sw == 0x6700) {
		PrintAndLogEx(INFO, ">>> trying to reissue command withouth Le...");
		res = EMVExchangeEx(channel, false, LeaveFieldON, (sAPDU){0x00, 0xb2, SFIrec, (SFI << 3) | 0x04, 0, NULL}, false, Result, MaxResultLen, ResultLen, sw, tlv);
	}
	return res;
}

int EMVAC(EMVCommandChannel channel, bool LeaveFieldON, uint8_t RefControl, uint8_t *CDOL, size_t CDOLLen, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw, struct tlvdb *tlv) {
	return EMVExchange(channel, LeaveFieldON, (sAPDU){0x80, 0xae, RefControl, 0x00, CDOLLen, CDOL}, Result, MaxResultLen, ResultLen, sw, tlv);
}

int EMVGenerateChallenge(EMVCommandChannel channel, bool LeaveFieldON, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw, struct tlvdb *tlv) {
	int res = EMVExchange(channel, LeaveFieldON, (sAPDU){0x00, 0x84, 0x00, 0x00, 0x00, NULL}, Result, MaxResultLen, ResultLen, sw, tlv);
	if (*sw == 0x6700) {
		PrintAndLogEx(INFO, ">>> trying to reissue command withouth Le...");
		res = EMVExchangeEx(channel, false, LeaveFieldON, (sAPDU){0x00, 0x84, 0x00, 0x00, 0x00, NULL}, false, Result, MaxResultLen, ResultLen, sw, tlv);
	}
	return res;
}

int EMVInternalAuthenticate(EMVCommandChannel channel, bool LeaveFieldON, uint8_t *DDOL, size_t DDOLLen, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw, struct tlvdb *tlv) {
	return EMVExchange(channel, LeaveFieldON, (sAPDU){0x00, 0x88, 0x00, 0x00, DDOLLen, DDOL}, Result, MaxResultLen, ResultLen, sw, tlv);
}

int MSCComputeCryptoChecksum(EMVCommandChannel channel, bool LeaveFieldON, uint8_t *UDOL, uint8_t UDOLlen, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw, struct tlvdb *tlv) {
	return EMVExchange(channel, LeaveFieldON, (sAPDU){0x80, 0x2a, 0x8e, 0x80, UDOLlen, UDOL}, Result, MaxResultLen, ResultLen, sw, tlv);
}

// Authentication 
struct emv_pk *get_ca_pk(struct tlvdb *db) {
	const struct tlv *df_tlv = tlvdb_get(db, 0x84, NULL);
	const struct tlv *caidx_tlv = tlvdb_get(db, 0x8f, NULL);

	if (!df_tlv || !caidx_tlv || df_tlv->len < 6 || caidx_tlv->len != 1)
		return NULL;

	PrintAndLogEx(NORMAL, "CA public key index 0x%0x", caidx_tlv->value[0]);
	return emv_pk_get_ca_pk(df_tlv->value, caidx_tlv->value[0]);
}

int trSDA(struct tlvdb *tlv) {

	struct emv_pk *pk = get_ca_pk(tlv);
	if (!pk) {
		PrintAndLogEx(WARNING, "Error: Key not found. Exit.");
		return 2;
	}
	
	struct emv_pk *issuer_pk = emv_pki_recover_issuer_cert(pk, tlv);
	if (!issuer_pk) {
		emv_pk_free(pk);
		PrintAndLogEx(WARNING, "Error: Issuer certificate not found. Exit.");
		return 2;
	}

	PrintAndLogEx(SUCCESS, "Issuer PK recovered. RID %02hhx:%02hhx:%02hhx:%02hhx:%02hhx IDX %02hhx CSN %02hhx:%02hhx:%02hhx",
		issuer_pk->rid[0],
		issuer_pk->rid[1],
		issuer_pk->rid[2],
		issuer_pk->rid[3],
		issuer_pk->rid[4],
		issuer_pk->index,
		issuer_pk->serial[0],
		issuer_pk->serial[1],
		issuer_pk->serial[2]
		);

	const struct tlv *sda_tlv = tlvdb_get(tlv, 0x21, NULL);
	if (!sda_tlv || sda_tlv->len < 1) {
		emv_pk_free(issuer_pk);
		emv_pk_free(pk);
		PrintAndLogEx(WARNING, "Can't find input list for Offline Data Authentication. Exit.");
		return 3;
	}
	
	struct tlvdb *dac_db = emv_pki_recover_dac(issuer_pk, tlv, sda_tlv);
	if (dac_db) {
		const struct tlv *dac_tlv = tlvdb_get(dac_db, 0x9f45, NULL);
		PrintAndLogEx(NORMAL, "SDA verified OK. (%02hhx:%02hhx)\n", dac_tlv->value[0], dac_tlv->value[1]);
		tlvdb_add(tlv, dac_db);
	} else {
		emv_pk_free(issuer_pk);
		emv_pk_free(pk);
		PrintAndLogEx(WARNING, "SSAD verify error");
		return 4;
	}
	
	emv_pk_free(issuer_pk);
	emv_pk_free(pk);
	return 0;
}

static const unsigned char default_ddol_value[] = {0x9f, 0x37, 0x04};
static struct tlv default_ddol_tlv = {.tag = 0x9f49, .len = 3, .value = default_ddol_value };

int trDDA(EMVCommandChannel channel, bool decodeTLV, struct tlvdb *tlv) {
	uint8_t buf[APDU_RES_LEN] = {0};
	size_t len = 0;
	uint16_t sw = 0;

	struct emv_pk *pk = get_ca_pk(tlv);
	if (!pk) {
		PrintAndLogEx(WARNING, "Error: Key not found. Exit.");
		return 2;
	}

	const struct tlv *sda_tlv = tlvdb_get(tlv, 0x21, NULL);
	if (!sda_tlv || sda_tlv->len < 1) {
		emv_pk_free(pk);
		PrintAndLogEx(WARNING, "Error: Can't find input list for Offline Data Authentication. Exit.");
		return 3;
	}

	struct emv_pk *issuer_pk = emv_pki_recover_issuer_cert(pk, tlv);
	if (!issuer_pk) {
		emv_pk_free(pk);
		PrintAndLogEx(WARNING, "Error: Issuer certificate not found. Exit.");
		return 2;
	}
	PrintAndLogEx(SUCCESS, "Issuer PK recovered. RID %02hhx:%02hhx:%02hhx:%02hhx:%02hhx IDX %02hhx CSN %02hhx:%02hhx:%02hhx\n",
			issuer_pk->rid[0],
			issuer_pk->rid[1],
			issuer_pk->rid[2],
			issuer_pk->rid[3],
			issuer_pk->rid[4],
			issuer_pk->index,
			issuer_pk->serial[0],
			issuer_pk->serial[1],
			issuer_pk->serial[2]
			);
				
	struct emv_pk *icc_pk = emv_pki_recover_icc_cert(issuer_pk, tlv, sda_tlv);
	if (!icc_pk) {
		emv_pk_free(pk);
		emv_pk_free(issuer_pk);
		PrintAndLogEx(WARNING, "Error: ICC setrificate not found. Exit.");
		return 2;
	}
	PrintAndLogEx(SUCCESS, "ICC PK recovered. RID %02hhx:%02hhx:%02hhx:%02hhx:%02hhx IDX %02hhx CSN %02hhx:%02hhx:%02hhx\n",
			icc_pk->rid[0],
			icc_pk->rid[1],
			icc_pk->rid[2],
			icc_pk->rid[3],
			icc_pk->rid[4],
			icc_pk->index,
			icc_pk->serial[0],
			icc_pk->serial[1],
			icc_pk->serial[2]
			);

	struct emv_pk *icc_pe_pk = emv_pki_recover_icc_pe_cert(issuer_pk, tlv);
	if (!icc_pe_pk) {
		PrintAndLogEx(WARNING, "WARNING: ICC PE PK recover error. ");
	} else {
		PrintAndLogEx(SUCCESS, "ICC PE PK recovered. RID %02hhx:%02hhx:%02hhx:%02hhx:%02hhx IDX %02hhx CSN %02hhx:%02hhx:%02hhx\n",
				icc_pe_pk->rid[0],
				icc_pe_pk->rid[1],
				icc_pe_pk->rid[2],
				icc_pe_pk->rid[3],
				icc_pe_pk->rid[4],
				icc_pe_pk->index,
				icc_pe_pk->serial[0],
				icc_pe_pk->serial[1],
				icc_pe_pk->serial[2]
				);
	}

	// 9F4B: Signed Dynamic Application Data
	const struct tlv *sdad_tlv = tlvdb_get(tlv, 0x9f4b, NULL);
	// DDA with internal authenticate OR fDDA with filled 0x9F4B tag (GPO result)
	// EMV kernel3 v2.4, contactless book C-3, C.1., page 147
	if (sdad_tlv) {
		PrintAndLogEx(NORMAL, "\n* * Got Signed Dynamic Application Data (9F4B) form GPO. Maybe fDDA...");

		const struct tlvdb *atc_db = emv_pki_recover_atc_ex(icc_pk, tlv, true);
		if (!atc_db) {
			PrintAndLogEx(WARNING, "Error: Can't recover IDN (ICC Dynamic Number)");
			emv_pk_free(pk);
			emv_pk_free(issuer_pk);
			emv_pk_free(icc_pk);
			return 8;
		}

		// 9f36 Application Transaction Counter (ATC)
		const struct tlv *atc_tlv = tlvdb_get(atc_db, 0x9f36, NULL);
		if(atc_tlv) {
			PrintAndLogEx(NORMAL, "\nATC (Application Transaction Counter) [%zu] %s", atc_tlv->len, sprint_hex_inrow(atc_tlv->value, atc_tlv->len));
			
			const struct tlv *core_atc_tlv = tlvdb_get(tlv, 0x9f36, NULL);
			if(tlv_equal(core_atc_tlv, atc_tlv)) {
				PrintAndLogEx(SUCCESS, "ATC check OK.");
				PrintAndLogEx(SUCCESS, "fDDA (fast DDA) verified OK.");
			} else {
				PrintAndLogEx(WARNING, "Error: fDDA verified, but ATC in the certificate and ATC in the record not the same.");
			}
		} else {
			PrintAndLogEx(NORMAL, "\nERROR: fDDA (fast DDA) verify error");
			emv_pk_free(pk);
			emv_pk_free(issuer_pk);
			emv_pk_free(icc_pk);
			return 9;
		}
	} else {
		struct tlvdb *dac_db = emv_pki_recover_dac(issuer_pk, tlv, sda_tlv);
		if (dac_db) {
			const struct tlv *dac_tlv = tlvdb_get(dac_db, 0x9f45, NULL);
			PrintAndLogEx(NORMAL, "SDA verified OK. (%02hhx:%02hhx)\n", dac_tlv->value[0], dac_tlv->value[1]);
			tlvdb_add(tlv, dac_db);
		} else {
			PrintAndLogEx(WARNING, "Error: SSAD verify error");
			emv_pk_free(pk);
			emv_pk_free(issuer_pk);
			emv_pk_free(icc_pk);
			return 4;
		}
		
		PrintAndLogEx(NORMAL, "\n* Calc DDOL");
		const struct tlv *ddol_tlv = tlvdb_get(tlv, 0x9f49, NULL);
		if (!ddol_tlv) {
			ddol_tlv = &default_ddol_tlv;
			PrintAndLogEx(NORMAL, "DDOL [9f49] not found. Using default DDOL");
		}

		struct tlv *ddol_data_tlv = dol_process(ddol_tlv, tlv, 0);
		if (!ddol_data_tlv) {
			PrintAndLogEx(WARNING, "Error: Can't create DDOL TLV");
			emv_pk_free(pk);
			emv_pk_free(issuer_pk);
			emv_pk_free(icc_pk);
			return 5;
		}

		PrintAndLogEx(NORMAL, "DDOL data[%d]: %s", ddol_data_tlv->len, sprint_hex(ddol_data_tlv->value, ddol_data_tlv->len));

		PrintAndLogEx(NORMAL, "\n* Internal Authenticate");
		int res = EMVInternalAuthenticate(channel, true, (uint8_t *)ddol_data_tlv->value, ddol_data_tlv->len, buf, sizeof(buf), &len, &sw, NULL);
		if (res) {	
			PrintAndLogEx(WARNING, "Internal Authenticate error(%d): %4x. Exit...", res, sw);
			free(ddol_data_tlv);
			emv_pk_free(pk);
			emv_pk_free(issuer_pk);
			emv_pk_free(icc_pk);
			return 6;
		}

		struct tlvdb *dda_db = NULL;
		if (buf[0] == 0x80) {
			if (len < 3 ) {
				PrintAndLogEx(WARNING, "Error: Internal Authenticate format1 parsing error. length=%d", len);
			} else {
				// 9f4b Signed Dynamic Application Data
				dda_db = tlvdb_fixed(0x9f4b, len - 2, buf + 2);
				tlvdb_add(tlv, dda_db);
				if (decodeTLV){
					PrintAndLogEx(NORMAL, "* * Decode response format 1:");
					TLVPrintFromTLV(dda_db);
				}
			}
		} else {
			dda_db = tlvdb_parse_multi(buf, len);
			if(!dda_db) {
				PrintAndLogEx(WARNING, "Error: Can't parse Internal Authenticate result as TLV");
				free(ddol_data_tlv);
				emv_pk_free(pk);
				emv_pk_free(issuer_pk);
				emv_pk_free(icc_pk);
				return 7;
			}
			tlvdb_add(tlv, dda_db);
			
			if (decodeTLV)
				TLVPrintFromTLV(dda_db);
		}

		struct tlvdb *idn_db = emv_pki_recover_idn_ex(icc_pk, dda_db, ddol_data_tlv, true);
		free(ddol_data_tlv);
		if (!idn_db) {
			PrintAndLogEx(WARNING, "Error: Can't recover IDN (ICC Dynamic Number)");
			tlvdb_free(dda_db);
			emv_pk_free(pk);
			emv_pk_free(issuer_pk);
			emv_pk_free(icc_pk);
			return 8;
		}
		tlvdb_free(dda_db);

		// 9f4c ICC Dynamic Number
		const struct tlv *idn_tlv = tlvdb_get(idn_db, 0x9f4c, NULL);
		if(idn_tlv) {
			PrintAndLogEx(NORMAL, "\nIDN (ICC Dynamic Number) [%zu] %s", idn_tlv->len, sprint_hex_inrow(idn_tlv->value, idn_tlv->len));
			PrintAndLogEx(NORMAL, "DDA verified OK.");
			tlvdb_add(tlv, idn_db);
			tlvdb_free(idn_db);
		} else {
			PrintAndLogEx(NORMAL, "\nERROR: DDA verify error");
			tlvdb_free(idn_db);

			emv_pk_free(pk);
			emv_pk_free(issuer_pk);
			emv_pk_free(icc_pk);
			return 9;
		}
	}
	
	emv_pk_free(pk);
	emv_pk_free(issuer_pk);
	emv_pk_free(icc_pk);
	return 0;
}

int trCDA(struct tlvdb *tlv, struct tlvdb *ac_tlv, struct tlv *pdol_data_tlv, struct tlv *ac_data_tlv) {

	struct emv_pk *pk = get_ca_pk(tlv);
	if (!pk) {
		PrintAndLogEx(WARNING, "Error: Key not found. Exit.");
		return 2;
	}

	const struct tlv *sda_tlv = tlvdb_get(tlv, 0x21, NULL);
	if (!sda_tlv || sda_tlv->len < 1) {
		PrintAndLogEx(WARNING, "Error: Can't find input list for Offline Data Authentication. Exit.");
		emv_pk_free(pk);
		return 3;
	}

	struct emv_pk *issuer_pk = emv_pki_recover_issuer_cert(pk, tlv);
	if (!issuer_pk) {
		PrintAndLogEx(WARNING, "Error: Issuer certificate not found. Exit.");
		emv_pk_free(pk);
		return 2;
	}
	PrintAndLogEx(SUCCESS, "Issuer PK recovered. RID %02hhx:%02hhx:%02hhx:%02hhx:%02hhx IDX %02hhx CSN %02hhx:%02hhx:%02hhx\n",
			issuer_pk->rid[0],
			issuer_pk->rid[1],
			issuer_pk->rid[2],
			issuer_pk->rid[3],
			issuer_pk->rid[4],
			issuer_pk->index,
			issuer_pk->serial[0],
			issuer_pk->serial[1],
			issuer_pk->serial[2]
			);
				
	struct emv_pk *icc_pk = emv_pki_recover_icc_cert(issuer_pk, tlv, sda_tlv);
	if (!icc_pk) {
		PrintAndLogEx(WARNING, "Error: ICC setrificate not found. Exit.");
		emv_pk_free(pk);
		emv_pk_free(issuer_pk);
		return 2;
	}
	PrintAndLogEx(SUCCESS, "ICC PK recovered. RID %02hhx:%02hhx:%02hhx:%02hhx:%02hhx IDX %02hhx CSN %02hhx:%02hhx:%02hhx\n",
			icc_pk->rid[0],
			icc_pk->rid[1],
			icc_pk->rid[2],
			icc_pk->rid[3],
			icc_pk->rid[4],
			icc_pk->index,
			icc_pk->serial[0],
			icc_pk->serial[1],
			icc_pk->serial[2]
			);

	struct tlvdb *dac_db = emv_pki_recover_dac(issuer_pk, tlv, sda_tlv);
	if (dac_db) {
		const struct tlv *dac_tlv = tlvdb_get(dac_db, 0x9f45, NULL);
		PrintAndLogEx(NORMAL, "SSAD verified OK. (%02hhx:%02hhx)", dac_tlv->value[0], dac_tlv->value[1]);
		tlvdb_add(tlv, dac_db);
	} else {
		PrintAndLogEx(WARNING, "Error: SSAD verify error");
		emv_pk_free(pk);
		emv_pk_free(issuer_pk);
		emv_pk_free(icc_pk);
		return 4;
	}
	
	PrintAndLogEx(NORMAL, "\n* * Check Signed Dynamic Application Data (SDAD)");
	struct tlvdb *idn_db = emv_pki_perform_cda_ex(icc_pk, tlv, ac_tlv,
			pdol_data_tlv, // pdol
			ac_data_tlv,   // cdol1
			NULL,          // cdol2 
			true);
	if (idn_db) {
		const struct tlv *idn_tlv = tlvdb_get(idn_db, 0x9f4c, NULL);
		PrintAndLogEx(NORMAL, "\nIDN (ICC Dynamic Number) [%zu] %s", idn_tlv->len, sprint_hex_inrow(idn_tlv->value, idn_tlv->len));
		PrintAndLogEx(NORMAL, "CDA verified OK.");
		tlvdb_add(tlv, idn_db);
	} else {
		PrintAndLogEx(NORMAL, "\nERROR: CDA verify error");
	}

	emv_pk_free(pk);
	emv_pk_free(issuer_pk);
	emv_pk_free(icc_pk);
	return 0;
}

int RecoveryCertificates(struct tlvdb *tlvRoot, json_t *root) {
	
	struct emv_pk *pk = get_ca_pk(tlvRoot);
	if (!pk) {
		PrintAndLog("ERROR: Key not found. Exit.");
		return 1;
	}

	struct emv_pk *issuer_pk = emv_pki_recover_issuer_cert(pk, tlvRoot);
	if (!issuer_pk) {
		emv_pk_free(pk);
		PrintAndLog("WARNING: Issuer certificate not found. Exit.");
		return 2;
	}
	PrintAndLogEx(SUCCESS, "Issuer PK recovered. RID %02hhx:%02hhx:%02hhx:%02hhx:%02hhx IDX %02hhx CSN %02hhx:%02hhx:%02hhx",
			issuer_pk->rid[0],
			issuer_pk->rid[1],
			issuer_pk->rid[2],
			issuer_pk->rid[3],
			issuer_pk->rid[4],
			issuer_pk->index,
			issuer_pk->serial[0],
			issuer_pk->serial[1],
			issuer_pk->serial[2]
			);

	JsonSaveBufAsHex(root, "$.ApplicationData.RID", issuer_pk->rid, 5);

	char *issuer_pk_c = emv_pk_dump_pk(issuer_pk);
	JsonSaveStr(root, "$.ApplicationData.IssuerPublicKeyDec", issuer_pk_c);
	JsonSaveBufAsHex(root, "$.ApplicationData.IssuerPublicKeyModulus", issuer_pk->modulus, issuer_pk->mlen);
	free(issuer_pk_c);

	struct emv_pk *icc_pk = emv_pki_recover_icc_cert(issuer_pk, tlvRoot, NULL);
	if (!icc_pk) {
		emv_pk_free(pk);
		emv_pk_free(issuer_pk);
		PrintAndLogEx(WARNING, "WARNING: ICC certificate not found. Exit.");
		return 2;
	}
	PrintAndLogEx(SUCCESS, "ICC PK recovered. RID %02hhx:%02hhx:%02hhx:%02hhx:%02hhx IDX %02hhx CSN %02hhx:%02hhx:%02hhx\n",
			icc_pk->rid[0],
			icc_pk->rid[1],
			icc_pk->rid[2],
			icc_pk->rid[3],
			icc_pk->rid[4],
			icc_pk->index,
			icc_pk->serial[0],
			icc_pk->serial[1],
			icc_pk->serial[2]
			);
	
	char *icc_pk_c = emv_pk_dump_pk(icc_pk);
	JsonSaveStr(root, "$.ApplicationData.ICCPublicKeyDec", icc_pk_c);
	JsonSaveBufAsHex(root, "$.ApplicationData.ICCPublicKeyModulus", icc_pk->modulus, icc_pk->mlen);
	free(issuer_pk_c);
	
	return 0;
}