Added loading parameters from json to several emv commands (#686)

* added loading params from GPO
* `hf emv pdol` added help and warning
* started `hf emv ac`
* dol calculation implemented in genac and intauth
* help fix

diff --git a/client/emv/cmdemv.c b/client/emv/cmdemv.c
index 544632ef261d57375d521910d4eb216e352b6e2b..6bac90d66df597bb9d105ec63658641bed4e9ac5 100644 (file)
--- a/client/emv/cmdemv.c
+++ b/client/emv/cmdemv.c
@@ -14,6 +14,31 @@
 #include "cliparser/cliparser.h"
 #include <jansson.h>
 
 #include "cliparser/cliparser.h"
 #include <jansson.h>
 

+bool HexToBuffer(const char *errormsg, const char *hexvalue, uint8_t * buffer, size_t maxbufferlen, size_t *bufferlen) {
+       int buflen = 0; 
+       
+       switch(param_gethex_to_eol(hexvalue, 0, buffer, maxbufferlen, &buflen)) {
+       case 1:
+               PrintAndLog("%s Invalid HEX value.", errormsg);
+               return false;
+       case 2:
+               PrintAndLog("%s Hex value too large.", errormsg);
+               return false;
+       case 3:
+               PrintAndLog("%s Hex value must have even number of digits.", errormsg);
+               return false;
+       }
+       
+       if (buflen > maxbufferlen) {
+               PrintAndLog("%s HEX length (%d) more than %d", errormsg, *bufferlen, maxbufferlen);
+               return false;
+       }
+       
+       *bufferlen = buflen;
+       
+       return true;
+}
+

 #define TLV_ADD(tag, value)( tlvdb_change_or_add_node(tlvRoot, tag, sizeof(value) - 1, (const unsigned char *)value) )
 void ParamLoadDefaults(struct tlvdb *tlvRoot) {
        //9F02:(Amount, authorized (Numeric)) len:6
 #define TLV_ADD(tag, value)( tlvdb_change_or_add_node(tlvRoot, tag, sizeof(value) - 1, (const unsigned char *)value) )
 void ParamLoadDefaults(struct tlvdb *tlvRoot) {
        //9F02:(Amount, authorized (Numeric)) len:6


@@ -35,6 +60,111 @@ void ParamLoadDefaults(struct tlvdb *tlvRoot) {
        TLV_ADD(0x9F66, "\x26\x00\x00\x00"); // qVSDC
 }
 
        TLV_ADD(0x9F66, "\x26\x00\x00\x00"); // qVSDC
 }
 

+bool ParamLoadFromJson(struct tlvdb *tlv) {
+       json_t *root;
+       json_error_t error;
+
+       if (!tlv) {
+               PrintAndLog("ERROR load params: tlv tree is NULL.");
+               return false; 
+       }
+
+       // current path + file name
+       const char *relfname = "emv/defparams.json"; 
+       char fname[strlen(get_my_executable_directory()) + strlen(relfname) + 1];
+       strcpy(fname, get_my_executable_directory());
+       strcat(fname, relfname);
+
+       root = json_load_file(fname, 0, &error);
+       if (!root) {
+               PrintAndLog("Load params: json error on line %d: %s", error.line, error.text);
+               return false; 
+       }
+       
+       if (!json_is_array(root)) {
+               PrintAndLog("Load params: Invalid json format. root must be array.");
+               return false; 
+       }
+       
+       PrintAndLog("Load params: json OK");
+       
+       for(int i = 0; i < json_array_size(root); i++) {
+               json_t *data, *jtype, *jlength, *jvalue;
+
+               data = json_array_get(root, i);
+               if(!json_is_object(data))
+               {
+                       PrintAndLog("Load params: data [%d] is not an object", i + 1);
+                       json_decref(root);
+                       return false;
+               }
+               
+               jtype = json_object_get(data, "type");
+               if(!json_is_string(jtype))
+               {
+                       PrintAndLog("Load params: data [%d] type is not a string", i + 1);
+                       json_decref(root);
+                       return false;
+               }
+               const char *tlvType = json_string_value(jtype);
+
+               jvalue = json_object_get(data, "value");
+               if(!json_is_string(jvalue))
+               {
+                       PrintAndLog("Load params: data [%d] value is not a string", i + 1);
+                       json_decref(root);
+                       return false;
+               }
+               const char *tlvValue = json_string_value(jvalue);
+
+               jlength = json_object_get(data, "length");
+               if(!json_is_number(jlength))
+               {
+                       PrintAndLog("Load params: data [%d] length is not a number", i + 1);
+                       json_decref(root);
+                       return false;
+               }
+               
+               int tlvLength = json_integer_value(jlength);
+               if (tlvLength > 250) {
+                       PrintAndLog("Load params: data [%d] length more than 250", i + 1);
+                       json_decref(root);
+                       return false;
+               }
+               
+               PrintAndLog("TLV param: %s[%d]=%s", tlvType, tlvLength, tlvValue);
+               uint8_t buf[251] = {0};
+               size_t buflen = 0;
+               
+               // here max length must be 4, but now tlv_tag_t is 2-byte var. so let it be 2 by now...  TODO: needs refactoring tlv_tag_t...
+               if (!HexToBuffer("TLV Error type:", tlvType, buf, 2, &buflen)) { 
+                       json_decref(root);
+                       return false;
+               }
+               tlv_tag_t tag = 0;
+               for (int i = 0; i < buflen; i++) {
+                       tag = (tag << 8) + buf[i];
+               }       
+               
+               if (!HexToBuffer("TLV Error value:", tlvValue, buf, sizeof(buf) - 1, &buflen)) {
+                       json_decref(root);
+                       return false;
+               }
+               
+               if (buflen != tlvLength) {
+                       PrintAndLog("Load params: data [%d] length of HEX must(%d) be identical to length in TLV param(%d)", i + 1, buflen, tlvLength);
+                       json_decref(root);
+                       return false;
+               }
+               
+               tlvdb_change_or_add_node(tlv, tag, tlvLength, (const unsigned char *)buf);              
+       }
+
+       json_decref(root);
+
+       return true;
+}
+

 int CmdHFEMVSelect(const char *cmd) {
        uint8_t data[APDU_AID_LEN] = {0};
        int datalen = 0;
 int CmdHFEMVSelect(const char *cmd) {
        uint8_t data[APDU_AID_LEN] = {0};
        int datalen = 0;


@@ -183,14 +313,14 @@ int CmdHFEMVGPO(const char *cmd) {
        CLIParserInit("hf emv gpo", 
                "Executes Get Processing Options command. It returns data in TLV format (0x77 - format2) or plain format (0x80 - format1).\nNeeds a EMV applet to be selected.", 
                "Usage:\n\thf emv gpo -k -> execute GPO\n"
        CLIParserInit("hf emv gpo", 
                "Executes Get Processing Options command. It returns data in TLV format (0x77 - format2) or plain format (0x80 - format1).\nNeeds a EMV applet to be selected.", 
                "Usage:\n\thf emv gpo -k -> execute GPO\n"

-                       "\thf emv gpo -t 01020304 -> execute GPO with 4-byte PDOL data, show result in TLV\n"); 
-                       // here need to add load params from file and gen pdol
+                       "\thf emv gpo -t 01020304 -> execute GPO with 4-byte PDOL data, show result in TLV\n"
+                       "\thf emv gpo -pmt 9F 37 04 -> load params from file, make PDOL data from PDOL, execute GPO with PDOL, show result in TLV\n"); 

 
        void* argtable[] = {
                arg_param_begin,
                arg_lit0("kK",  "keep",    "keep field ON for next command"),
 
        void* argtable[] = {
                arg_param_begin,
                arg_lit0("kK",  "keep",    "keep field ON for next command"),

-               arg_lit0("pP",  "params",  "load parameters for PDOL making from `emv/defparams.json` file (by default uses default parameters) (NOT WORK!!!)"),
-               arg_lit0("mM",  "make",    "make PDOLdata from PDOL (tag 9F38) and parameters (NOT WORK!!!)"),
+               arg_lit0("pP",  "params",  "load parameters from `emv/defparams.json` file for PDOLdata making from PDOL and parameters"),
+               arg_lit0("mM",  "make",    "make PDOLdata from PDOL (tag 9F38) and parameters (by default uses default parameters)"),

                arg_lit0("aA",  "apdu",    "show APDU reqests and responses"),
                arg_lit0("tT",  "tlv",     "TLV decode results of selected applets"),
                arg_strx0(NULL,  NULL,     "<HEX PDOLdata/PDOL>", NULL),
                arg_lit0("aA",  "apdu",    "show APDU reqests and responses"),
                arg_lit0("tT",  "tlv",     "TLV decode results of selected applets"),
                arg_strx0(NULL,  NULL,     "<HEX PDOLdata/PDOL>", NULL),


@@ -220,21 +350,23 @@ int CmdHFEMVGPO(const char *cmd) {
                .value = (uint8_t *)data,
        };
        if (dataMakeFromPDOL) {
                .value = (uint8_t *)data,
        };
        if (dataMakeFromPDOL) {

-               // TODO
-               PrintAndLog("Make PDOL data not implemented!");
-

                ParamLoadDefaults(tlvRoot);
 
                if (paramsLoadFromFile) {
                ParamLoadDefaults(tlvRoot);
 
                if (paramsLoadFromFile) {

+                       PrintAndLog("Params loading from file...");
+                       ParamLoadFromJson(tlvRoot);

                };
                };

-/*             pdol_data_tlv = dol_process(tlvdb_get(tlvRoot, 0x9f38, NULL), tlvRoot, 0x83);
+               
+               pdol_data_tlv = dol_process((const struct tlv *)tlvdb_external(0x9f38, datalen, data), tlvRoot, 0x83);

                if (!pdol_data_tlv){
                        PrintAndLog("ERROR: can't create PDOL TLV.");
                        tlvdb_free(tlvRoot);
                        return 4;
                if (!pdol_data_tlv){
                        PrintAndLog("ERROR: can't create PDOL TLV.");
                        tlvdb_free(tlvRoot);
                        return 4;

-               }*/
-               return 0;
+               }

        } else {
        } else {

+               if (paramsLoadFromFile) {
+                       PrintAndLog("WARNING: don't need to load parameters. Sending plain PDOL data...");
+               }

                pdol_data_tlv = &data_tlv;
        }
 
                pdol_data_tlv = &data_tlv;
        }
 


@@ -253,7 +385,8 @@ int CmdHFEMVGPO(const char *cmd) {
        uint16_t sw = 0;
        int res = EMVGPO(leaveSignalON, pdol_data_tlv_data, pdol_data_tlv_data_len, buf, sizeof(buf), &len, &sw, tlvRoot);
        
        uint16_t sw = 0;
        int res = EMVGPO(leaveSignalON, pdol_data_tlv_data, pdol_data_tlv_data_len, buf, sizeof(buf), &len, &sw, tlvRoot);
        

-       free(pdol_data_tlv_data);
+       if (pdol_data_tlv != &data_tlv)
+               free(pdol_data_tlv);

        tlvdb_free(tlvRoot);
        
        if (sw)
        tlvdb_free(tlvRoot);
        
        if (sw)


@@ -326,16 +459,19 @@ int CmdHFEMVAC(const char *cmd) {
                "Generate Application Cryptogram command. It returns data in TLV format .\nNeeds a EMV applet to be selected and GPO to be executed.", 
                "Usage:\n\thf emv genac -k 0102 -> generate AC with 2-byte CDOLdata and keep field ON after command\n"
                        "\thf emv genac -t 01020304 -> generate AC with 4-byte CDOL data, show result in TLV\n"
                "Generate Application Cryptogram command. It returns data in TLV format .\nNeeds a EMV applet to be selected and GPO to be executed.", 
                "Usage:\n\thf emv genac -k 0102 -> generate AC with 2-byte CDOLdata and keep field ON after command\n"
                        "\thf emv genac -t 01020304 -> generate AC with 4-byte CDOL data, show result in TLV\n"

-                       "\thf emv genac -Daac 01020304 -> generate AC with 4-byte CDOL data and terminal decision 'declined'\n"); 
+                       "\thf emv genac -Daac 01020304 -> generate AC with 4-byte CDOL data and terminal decision 'declined'\n"
+                       "\thf emv genac -pmt 9F 37 04 -> load params from file, make CDOL data from CDOL, generate AC with CDOL, show result in TLV"); 

 
        void* argtable[] = {
                arg_param_begin,
                arg_lit0("kK",  "keep",     "keep field ON for next command"),
                arg_lit0("cC",  "cda",      "executes CDA transaction. Needs to get SDAD in results."),
                arg_str0("dD",  "decision", "<aac|tc|arqc>", "Terminal decision. aac - declined, tc - approved, arqc - online authorisation requested"),
 
        void* argtable[] = {
                arg_param_begin,
                arg_lit0("kK",  "keep",     "keep field ON for next command"),
                arg_lit0("cC",  "cda",      "executes CDA transaction. Needs to get SDAD in results."),
                arg_str0("dD",  "decision", "<aac|tc|arqc>", "Terminal decision. aac - declined, tc - approved, arqc - online authorisation requested"),

+               arg_lit0("pP",  "params",   "load parameters from `emv/defparams.json` file for CDOLdata making from CDOL and parameters"),
+               arg_lit0("mM",  "make",     "make CDOLdata from CDOL (tag 8C and 8D) and parameters (by default uses default parameters)"),

                arg_lit0("aA",  "apdu",     "show APDU reqests and responses"),
                arg_lit0("tT",  "tlv",      "TLV decode results of selected applets"),
                arg_lit0("aA",  "apdu",     "show APDU reqests and responses"),
                arg_lit0("tT",  "tlv",      "TLV decode results of selected applets"),

-               arg_strx1(NULL,  NULL,      "<HEX CDOLdata>", NULL),
+               arg_strx1(NULL,  NULL,      "<HEX CDOLdata/CDOL>", NULL),

                arg_param_end
        };
        CLIExecWithReturn(cmd, argtable, false);
                arg_param_end
        };
        CLIExecWithReturn(cmd, argtable, false);


@@ -360,9 +496,11 @@ int CmdHFEMVAC(const char *cmd) {
        }
        if (trTypeCDA)
                termDecision = termDecision | EMVAC_CDAREQ;
        }
        if (trTypeCDA)
                termDecision = termDecision | EMVAC_CDAREQ;

-       bool APDULogging = arg_get_lit(4);
-       bool decodeTLV = arg_get_lit(5);
-       CLIGetStrWithReturn(6, data, &datalen);
+       bool paramsLoadFromFile = arg_get_lit(4);
+       bool dataMakeFromCDOL = arg_get_lit(5);
+       bool APDULogging = arg_get_lit(6);
+       bool decodeTLV = arg_get_lit(7);
+       CLIGetStrWithReturn(8, data, &datalen);

        CLIParserFree();        
        
        SetAPDULogging(APDULogging);
        CLIParserFree();        
        
        SetAPDULogging(APDULogging);


@@ -373,22 +511,43 @@ int CmdHFEMVAC(const char *cmd) {
        
        // calc CDOL
        struct tlv *cdol_data_tlv = NULL;
        
        // calc CDOL
        struct tlv *cdol_data_tlv = NULL;

-//     struct tlv *cdol_data_tlv = dol_process(tlvdb_get(tlvRoot, 0x8c, NULL), tlvRoot, 0x01); // 0x01 - dummy tag

        struct tlv data_tlv = {
                .tag = 0x01,
                .len = datalen,
                .value = (uint8_t *)data,
        struct tlv data_tlv = {
                .tag = 0x01,
                .len = datalen,
                .value = (uint8_t *)data,

-       };      
-       cdol_data_tlv = &data_tlv;
-       PrintAndLog("CDOL data[%d]: %s", cdol_data_tlv->len, sprint_hex(cdol_data_tlv->value, cdol_data_tlv->len));
+       };

        
        

+       if (dataMakeFromCDOL) {
+               ParamLoadDefaults(tlvRoot);
+
+               if (paramsLoadFromFile) {
+                       PrintAndLog("Params loading from file...");
+                       ParamLoadFromJson(tlvRoot);
+               };
+               
+               cdol_data_tlv = dol_process((const struct tlv *)tlvdb_external(0x8c, datalen, data), tlvRoot, 0x01); // 0x01 - dummy tag
+               if (!cdol_data_tlv){
+                       PrintAndLog("ERROR: can't create CDOL TLV.");
+                       tlvdb_free(tlvRoot);
+                       return 4;
+               }
+       } else {
+               if (paramsLoadFromFile) {
+                       PrintAndLog("WARNING: don't need to load parameters. Sending plain CDOL data...");
+               }
+               cdol_data_tlv = &data_tlv;
+       }
+       
+       PrintAndLog("CDOL data[%d]: %s", cdol_data_tlv->len, sprint_hex(cdol_data_tlv->value, cdol_data_tlv->len));
+

        // exec
        uint8_t buf[APDU_RES_LEN] = {0};
        size_t len = 0;
        uint16_t sw = 0;
        int res = EMVAC(leaveSignalON, termDecision, (uint8_t *)cdol_data_tlv->value, cdol_data_tlv->len, buf, sizeof(buf), &len, &sw, tlvRoot);
        
        // exec
        uint8_t buf[APDU_RES_LEN] = {0};
        size_t len = 0;
        uint16_t sw = 0;
        int res = EMVAC(leaveSignalON, termDecision, (uint8_t *)cdol_data_tlv->value, cdol_data_tlv->len, buf, sizeof(buf), &len, &sw, tlvRoot);
        

-//     free(cdol_data_tlv);
+       if (cdol_data_tlv != &data_tlv)
+               free(cdol_data_tlv);

        tlvdb_free(tlvRoot);
        
        if (sw)
        tlvdb_free(tlvRoot);
        
        if (sw)


@@ -450,28 +609,65 @@ int CmdHFEMVInternalAuthenticate(const char *cmd) {
        CLIParserInit("hf emv intauth", 
                "Generate Internal Authenticate command. Usually needs 4-byte random number. It returns data in TLV format .\nNeeds a EMV applet to be selected and GPO to be executed.", 
                "Usage:\n\thf emv intauth -k 01020304 -> execute Internal Authenticate with 4-byte DDOLdata and keep field ON after command\n"
        CLIParserInit("hf emv intauth", 
                "Generate Internal Authenticate command. Usually needs 4-byte random number. It returns data in TLV format .\nNeeds a EMV applet to be selected and GPO to be executed.", 
                "Usage:\n\thf emv intauth -k 01020304 -> execute Internal Authenticate with 4-byte DDOLdata and keep field ON after command\n"

-                       "\thf emv intauth -t 01020304 -> execute Internal Authenticate with 4-byte DDOL data, show result in TLV\n"); 
+                       "\thf emv intauth -t 01020304 -> execute Internal Authenticate with 4-byte DDOL data, show result in TLV\n"
+                       "\thf emv intauth -pmt 9F 37 04 -> load params from file, make DDOL data from DDOL, Internal Authenticate with DDOL, show result in TLV"); 

 
        void* argtable[] = {
                arg_param_begin,
                arg_lit0("kK",  "keep",    "keep field ON for next command"),
 
        void* argtable[] = {
                arg_param_begin,
                arg_lit0("kK",  "keep",    "keep field ON for next command"),

+               arg_lit0("pP",  "params",  "load parameters from `emv/defparams.json` file for DDOLdata making from DDOL and parameters"),
+               arg_lit0("mM",  "make",    "make DDOLdata from DDOL (tag 9F49) and parameters (by default uses default parameters)"),

                arg_lit0("aA",  "apdu",    "show APDU reqests and responses"),
                arg_lit0("tT",  "tlv",     "TLV decode results of selected applets"),
                arg_lit0("aA",  "apdu",    "show APDU reqests and responses"),
                arg_lit0("tT",  "tlv",     "TLV decode results of selected applets"),

-               arg_strx1(NULL,  NULL,     "<HEX DDOLdata>", NULL),
+               arg_strx1(NULL,  NULL,     "<HEX DDOLdata/DDOL>", NULL),

                arg_param_end
        };
        CLIExecWithReturn(cmd, argtable, false);
        
        bool leaveSignalON = arg_get_lit(1);
                arg_param_end
        };
        CLIExecWithReturn(cmd, argtable, false);
        
        bool leaveSignalON = arg_get_lit(1);

-       bool APDULogging = arg_get_lit(2);
-       bool decodeTLV = arg_get_lit(3);
-       CLIGetStrWithReturn(4, data, &datalen);
+       bool paramsLoadFromFile = arg_get_lit(2);
+       bool dataMakeFromDDOL = arg_get_lit(3);
+       bool APDULogging = arg_get_lit(4);
+       bool decodeTLV = arg_get_lit(5);
+       CLIGetStrWithReturn(6, data, &datalen);

        CLIParserFree();        
        
        SetAPDULogging(APDULogging);
        CLIParserFree();        
        
        SetAPDULogging(APDULogging);

+
+       // Init TLV tree
+       const char *alr = "Root terminal TLV tree";
+       struct tlvdb *tlvRoot = tlvdb_fixed(1, strlen(alr), (const unsigned char *)alr);
+       
+       // calc DDOL
+       struct tlv *ddol_data_tlv = NULL;
+       struct tlv data_tlv = {
+               .tag = 0x01,
+               .len = datalen,
+               .value = (uint8_t *)data,
+       };
+       
+       if (dataMakeFromDDOL) {
+               ParamLoadDefaults(tlvRoot);
+
+               if (paramsLoadFromFile) {
+                       PrintAndLog("Params loading from file...");
+                       ParamLoadFromJson(tlvRoot);
+               };
+               
+               ddol_data_tlv = dol_process((const struct tlv *)tlvdb_external(0x9f49, datalen, data), tlvRoot, 0x01); // 0x01 - dummy tag
+               if (!ddol_data_tlv){
+                       PrintAndLog("ERROR: can't create DDOL TLV.");
+                       tlvdb_free(tlvRoot);
+                       return 4;
+               }
+       } else {
+               if (paramsLoadFromFile) {
+                       PrintAndLog("WARNING: don't need to load parameters. Sending plain DDOL data...");
+               }
+               ddol_data_tlv = &data_tlv;
+       }

        
        

-       // DDOL
-       PrintAndLog("DDOL data[%d]: %s", datalen, sprint_hex(data, datalen));
+       PrintAndLog("DDOL data[%d]: %s", ddol_data_tlv->len, sprint_hex(ddol_data_tlv->value, ddol_data_tlv->len));

        
        // exec
        uint8_t buf[APDU_RES_LEN] = {0};
        
        // exec
        uint8_t buf[APDU_RES_LEN] = {0};


@@ -479,6 +675,10 @@ int CmdHFEMVInternalAuthenticate(const char *cmd) {
        uint16_t sw = 0;
        int res = EMVInternalAuthenticate(leaveSignalON, data, datalen, buf, sizeof(buf), &len, &sw, NULL);
        
        uint16_t sw = 0;
        int res = EMVInternalAuthenticate(leaveSignalON, data, datalen, buf, sizeof(buf), &len, &sw, NULL);
        

+       if (ddol_data_tlv != &data_tlv)
+               free(ddol_data_tlv);
+       tlvdb_free(tlvRoot);    
+       

        if (sw)
                PrintAndLog("APDU response status: %04x - %s", sw, GetAPDUCodeDescription(sw >> 8, sw & 0xff)); 
 
        if (sw)
                PrintAndLog("APDU response status: %04x - %s", sw, GetAPDUCodeDescription(sw >> 8, sw & 0xff)); 
 


@@ -493,136 +693,6 @@ int CmdHFEMVInternalAuthenticate(const char *cmd) {
 
 #define dreturn(n) {free(pdol_data_tlv);tlvdb_free(tlvSelect);tlvdb_free(tlvRoot);DropField();return n;}
 
 
 #define dreturn(n) {free(pdol_data_tlv);tlvdb_free(tlvSelect);tlvdb_free(tlvRoot);DropField();return n;}
 

-bool HexToBuffer(const char *errormsg, const char *hexvalue, uint8_t * buffer, size_t maxbufferlen, size_t *bufferlen) {
-       int buflen = 0; 
-       
-       switch(param_gethex_to_eol(hexvalue, 0, buffer, maxbufferlen, &buflen)) {
-       case 1:
-               PrintAndLog("%s Invalid HEX value.", errormsg);
-               return false;
-       case 2:
-               PrintAndLog("%s Hex value too large.", errormsg);
-               return false;
-       case 3:
-               PrintAndLog("%s Hex value must have even number of digits.", errormsg);
-               return false;
-       }
-       
-       if (buflen > maxbufferlen) {
-               PrintAndLog("%s HEX length (%d) more than %d", errormsg, *bufferlen, maxbufferlen);
-               return false;
-       }
-       
-       *bufferlen = buflen;
-       
-       return true;
-}
-
-bool ParamLoadFromJson(struct tlvdb *tlv) {
-       json_t *root;
-       json_error_t error;
-
-       if (!tlv) {
-               PrintAndLog("ERROR load params: tlv tree is NULL.");
-               return false; 
-       }
-
-       // current path + file name
-       const char *relfname = "emv/defparams.json"; 
-       char fname[strlen(get_my_executable_directory()) + strlen(relfname) + 1];
-       strcpy(fname, get_my_executable_directory());
-       strcat(fname, relfname);
-
-       root = json_load_file(fname, 0, &error);
-       if (!root) {
-               PrintAndLog("Load params: json error on line %d: %s", error.line, error.text);
-               return false; 
-       }
-       
-       if (!json_is_array(root)) {
-               PrintAndLog("Load params: Invalid json format. root must be array.");
-               return false; 
-       }
-       
-       PrintAndLog("Load params: json OK");
-       
-       for(int i = 0; i < json_array_size(root); i++) {
-               json_t *data, *jtype, *jlength, *jvalue;
-
-               data = json_array_get(root, i);
-               if(!json_is_object(data))
-               {
-                       PrintAndLog("Load params: data [%d] is not an object", i + 1);
-                       json_decref(root);
-                       return false;
-               }
-               
-               jtype = json_object_get(data, "type");
-               if(!json_is_string(jtype))
-               {
-                       PrintAndLog("Load params: data [%d] type is not a string", i + 1);
-                       json_decref(root);
-                       return false;
-               }
-               const char *tlvType = json_string_value(jtype);
-
-               jvalue = json_object_get(data, "value");
-               if(!json_is_string(jvalue))
-               {
-                       PrintAndLog("Load params: data [%d] value is not a string", i + 1);
-                       json_decref(root);
-                       return false;
-               }
-               const char *tlvValue = json_string_value(jvalue);
-
-               jlength = json_object_get(data, "length");
-               if(!json_is_number(jlength))
-               {
-                       PrintAndLog("Load params: data [%d] length is not a number", i + 1);
-                       json_decref(root);
-                       return false;
-               }
-               
-               int tlvLength = json_integer_value(jlength);
-               if (tlvLength > 250) {
-                       PrintAndLog("Load params: data [%d] length more than 250", i + 1);
-                       json_decref(root);
-                       return false;
-               }
-               
-               PrintAndLog("TLV param: %s[%d]=%s", tlvType, tlvLength, tlvValue);
-               uint8_t buf[251] = {0};
-               size_t buflen = 0;
-               
-               // here max length must be 4, but now tlv_tag_t is 2-byte var. so let it be 2 by now...  TODO: needs refactoring tlv_tag_t...
-               if (!HexToBuffer("TLV Error type:", tlvType, buf, 2, &buflen)) { 
-                       json_decref(root);
-                       return false;
-               }
-               tlv_tag_t tag = 0;
-               for (int i = 0; i < buflen; i++) {
-                       tag = (tag << 8) + buf[i];
-               }       
-               
-               if (!HexToBuffer("TLV Error value:", tlvValue, buf, sizeof(buf) - 1, &buflen)) {
-                       json_decref(root);
-                       return false;
-               }
-               
-               if (buflen != tlvLength) {
-                       PrintAndLog("Load params: data [%d] length of HEX must(%d) be identical to length in TLV param(%d)", i + 1, buflen, tlvLength);
-                       json_decref(root);
-                       return false;
-               }
-               
-               tlvdb_change_or_add_node(tlv, tag, tlvLength, (const unsigned char *)buf);              
-       }
-
-       json_decref(root);
-
-       return true;
-}
-

 int CmdHFEMVExec(const char *cmd) {
        uint8_t buf[APDU_RES_LEN] = {0};
        size_t len = 0;
 int CmdHFEMVExec(const char *cmd) {
        uint8_t buf[APDU_RES_LEN] = {0};
        size_t len = 0;