Updated on 2026-08-14

app/build.gradle

@@ -61,6 +61,7 @@ dependencies {
     implementation 'org.bitcoinj:bitcoinj-core:0.14.4'
     implementation 'me.dm7.barcodescanner:zxing:1.9.8'
     implementation 'info.hoang8f:android-segmented:1.0.6'
+    implementation 'com.google.code.gson:gson:2.8.5'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

app/src/main/java/com/tangem/data/network/request/VerificationServerProtocol.java

@@ -0,0 +1,192 @@
+package com.tangem.data.network.request;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.tangem.domain.wallet.TangemCard;
+import com.tangem.util.Util;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.lang.reflect.Type;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.net.URLConnection;
+import java.nio.charset.StandardCharsets;
+import java.sql.Date;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Locale;
+
+public class VerificationServerProtocol {
+
+    public static class Request
+    {
+        public Request(CustomCommand command, Class answerClass)
+        {
+            this.command=command;
+            this.answerClass=answerClass;
+        }
+        public String error;
+        public CustomCommand command;
+        public CustomAnswer answer;
+        public Type answerClass;
+
+        public void doPost(String hostURL) throws IOException {
+            URL url = new URL(hostURL+"/"+command.getURL());
+            URLConnection con = url.openConnection();
+            HttpURLConnection http = (HttpURLConnection) con;
+            try {
+                http.setConnectTimeout(30000);
+                http.setReadTimeout(30000);
+                http.setRequestMethod("POST"); // PUT is another valid option
+                http.setDoOutput(true);
+
+                String sRequestBody = getGson().toJson(this);
+
+                byte[] out = sRequestBody.getBytes(StandardCharsets.UTF_8);
+                int length = out.length;
+
+                http.setFixedLengthStreamingMode(length);
+                http.setRequestProperty("Content-Type", "application/json");
+                http.connect();
+                try (OutputStream os = http.getOutputStream()) {
+                    os.write(out);
+                }
+                try (InputStream is = http.getInputStream()) {
+                    try (BufferedReader br = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8))) {
+                        answer = getGson().fromJson(br, answerClass);
+                    }
+                }
+            }
+            finally {
+                http.disconnect();
+            }
+        }
+    }
+
+    static abstract class CustomCommand {
+        public abstract String getURL();
+
+        public byte[] toBytes()
+        {
+            return getGson().toJson(this).getBytes(StandardCharsets.UTF_8);
+        }
+
+        @Override
+        public String toString() {
+            return getGson().toJson(this);
+        }
+
+    }
+
+    static class CustomAnswer {
+        public String error;
+
+        @Override
+        public String toString() {
+            return getGson().toJson(this);
+        }
+    }
+
+    public static class Verify {
+
+        static class RequestItem {
+            public String CID;
+            public String publicKey;
+        }
+
+        static class Command extends CustomCommand {
+            public RequestItem[] requests;
+
+            @Override
+            public String getURL() {
+                return "verify";
+            }
+        }
+
+        static class ResultItem {
+            public ResultItem(RequestItem request) {
+                CID = request.CID;
+            }
+
+            public String error;
+            public String CID;
+            public Boolean passed;
+        }
+
+        static class Answer extends CustomAnswer {
+            public ResultItem[] results;
+        }
+
+        public Request prepare(TangemCard card)
+        {
+            Command c=new Command();
+            c.requests=new RequestItem[1];
+            c.requests[0].CID= Util.bytesToHex(card.getCID());
+            c.requests[0].publicKey=Util.bytesToHex(card.getCardPublicKey());
+
+            return new Request(c,Answer.class);
+        }
+    }
+
+    public static class Validate {
+
+        static class RequestItem {
+            public String CID;
+            public int counter;
+            public String signature;
+        }
+
+        static class Command extends CustomCommand {
+            public RequestItem[] requests;
+
+            @Override
+            public String getURL() {
+                return "validate";
+            }
+        }
+
+        static class ResultItem {
+            public ResultItem(RequestItem request) {
+                CID = request.CID;
+            }
+            public String error;
+            public String CID;
+            public Integer previousCounter;
+            public Boolean passed;
+        }
+
+        static class Answer extends CustomAnswer {
+            public ResultItem[] results;
+        }
+
+        public Request prepare(TangemCard card, int ValidationCounter, byte[] ValidationSignature)
+        {
+            Command c=new Command();
+            c.requests=new RequestItem[1];
+            c.requests[0].CID= Util.bytesToHex(card.getCID());
+            c.requests[0].counter=ValidationCounter;
+            c.requests[0].signature=Util.bytesToHex(ValidationSignature);
+            return new Request(new Command(),Answer.class);
+        }
+    }
+
+
+    public static Date strToDate(String date) throws ParseException {
+        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd", Locale.US);
+        return new Date(formatter.parse(date).getTime());
+    }
+
+    public static String dateToStr(Date date) {
+        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd", Locale.US);
+        return formatter.format(date);
+    }
+
+    public static Gson getGson() {
+        return new GsonBuilder().create();
+    }
+
+}

app/src/main/java/com/tangem/data/network/task/VerificationServerTask.java

@@ -0,0 +1,42 @@
+package com.tangem.data.network.task;
+
+import android.os.AsyncTask;
+
+import com.tangem.data.network.request.VerificationServerProtocol;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class VerificationServerTask extends AsyncTask<VerificationServerProtocol.Request, Void, List<VerificationServerProtocol.Request>> {
+        public static final String hostURL ="https://tangem-webapp.appspot.com";
+
+        public VerificationServerTask() {
+
+        }
+
+        protected List<VerificationServerProtocol.Request> doInBackground(VerificationServerProtocol.Request... requests) {
+            List<VerificationServerProtocol.Request> result = new ArrayList<>();
+            for (int i = 0; i < requests.length; i++) {
+                result.add(requests[i]);
+            }
+
+            for (VerificationServerProtocol.Request request : result) {
+                try {
+                    request.doPost(hostURL);
+                } catch (Exception e) {
+                    request.error = e.getMessage();
+                    if( request.error==null || request.error.isEmpty() )
+                    {
+                        request.error = e.getClass().getName();
+                    }
+                }
+            }
+
+            return result;
+        }
+
+        public String getValidationNodeDescription() {
+            return hostURL;
+        }
+
+    }

app/src/main/java/com/tangem/domain/BitcoinNodeTestNet.kt

@@ -1,9 +1,8 @@
 package com.tangem.domain
 
 enum class BitcoinNodeTestNet(val host: String, val port: Int) {
-    arihanc_com("testnetnode.arihanc.com", 51001),
-    hsmiths_com("testnet.hsmiths.com", 53011),
     qtornado_com("testnet.qtornado.com", 51001),
+    hsmiths_com("testnet.hsmiths.com", 53011),
     bauerj_eu("testnet1.bauerj.eu", 50001),
-
+    arihanc_com("testnetnode.arihanc.com", 51001),
 }

app/src/main/java/com/tangem/domain/cardReader/CardCrypto.java

@@ -179,12 +179,12 @@ public class CardCrypto {
             Log.e("cardCrypto","enc:" +Util.bytesToHex(enc));
             throw new Exception("unsupported s-length - r-length:" + String.valueOf(rLength)+",s-length:" + String.valueOf(sLength)+",enc:" +Util.bytesToHex(enc));
         }
-        
+
         if(!VerifySignature(GeneratePublicKey(privateKeyArray), data, res))
         {
         	throw new Exception("Signature self verify failed - r-length:" + String.valueOf(rLength)+",s-length:" + String.valueOf(sLength)+",enc:" +Util.bytesToHex(enc)+",res:"+Util.bytesToHex(res));
         }
-        
+
         return res;
     }
 
@@ -206,7 +206,7 @@ public class CardCrypto {
      * @return              the PBDKF2 hash of the password
      */
     public static byte[] pbkdf2(byte[] password, byte[] salt, int iterations)
-            throws NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException {
+            throws InvalidKeyException {
         return PBKDF2.deriveKey(password, salt, iterations);
     }
 
@@ -219,22 +219,20 @@ public class CardCrypto {
         return mEncryptedData;
     }
 
-    public static byte[] Decrypt(byte[] key, byte[] data) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
-        try {
+    public static byte[] Decrypt(byte[] key, byte[] data, boolean UsePKCS7)
+            throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException, NoSuchProviderException {
+        if (UsePKCS7) {
             SecretKeySpec skeySpec = new SecretKeySpec(key, "AES/CBC/PKCS7PADDING");
             Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7PADDING");
             cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(new byte[16]));
-            byte[] decryptedData = cipher.doFinal(Arrays.copyOfRange(data, 0, data.length ));
+            byte[] decryptedData = cipher.doFinal(Arrays.copyOfRange(data, 0, data.length));
             return decryptedData;
-        }
-        catch (Exception e)
-        {
+        } else {
             SecretKeySpec skeySpec = new SecretKeySpec(key, "AES/CBC/NOPADDING");
             Cipher cipher = Cipher.getInstance("AES/CBC/NOPADDING");
             cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(new byte[16]));
-            byte[] decryptedData = cipher.doFinal(Arrays.copyOfRange(data, 0, data.length ));
-            Log.e("decrypt",Util.bytesToHex(decryptedData));
-            throw e;
+            byte[] decryptedData = cipher.doFinal(Arrays.copyOfRange(data, 0, data.length));
+            return decryptedData;
         }
     }
 }

app/src/main/java/com/tangem/domain/cardReader/CardProtocol.java

@@ -539,7 +539,7 @@ public class CardProtocol {
                     } catch (Exception ee) {
                         ee.printStackTrace();
                         Log.e(logTag, "Cannot get issuer");
-                        mCard.setIssuer(Issuer.Unknown);
+                        mCard.setIssuer(Issuer.Unknown());
                     }
                 }
 
@@ -830,7 +830,7 @@ public class CardProtocol {
             rqApdu.addTLV(TLV.Tag.TAG_Issuer_Transaction_Signature, issuerSignature);
         }
         if (issuerData != null) {
-            if (issuer == null || issuer == Issuer.Unknown)
+            if (issuer == null || issuer == Issuer.Unknown())
                 throw new Exception("Need known Issuer to write issuer Data");
             rqApdu.addTLV(TLV.Tag.TAG_Issuer_Data, issuerData);
             byte[] issuerSignature = CardCrypto.Signature(issuer.getPrivateTransactionKey(), issuerData);

app/src/main/java/com/tangem/domain/cardReader/ResponseApdu.java

@@ -59,7 +59,7 @@ public class ResponseApdu {
             responseApdu.mSw2 = ((int) data[1] & 0xFF);
             return responseApdu;
         }else if( data.length>=18 ){
-            byte[] decryptedData = CardCrypto.Decrypt(key, Arrays.copyOfRange(data, 0, data.length - 2));
+            byte[] decryptedData = CardCrypto.Decrypt(key, Arrays.copyOfRange(data, 0, data.length - 2),true);
 
             ByteArrayInputStream inputStream = new ByteArrayInputStream(decryptedData);
             byte[] baLength = new byte[2];

app/src/main/java/com/tangem/domain/wallet/Issuer.java

@@ -1,120 +1,289 @@
 package com.tangem.domain.wallet;
 
-import com.tangem.domain.cardReader.CardCrypto;
+import android.content.Context;
+import android.content.res.Resources;
+import android.util.Log;
 
+import com.google.gson.Gson;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import com.tangem.domain.cardReader.CardCrypto;
+import com.tangem.util.Util;
+import com.tangem.wallet.R;
+
+import java.io.BufferedReader;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.StringWriter;
+import java.io.UnsupportedEncodingException;
+import java.io.Writer;
+import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.List;
 
 /**
  * Created by dvol on 14.11.2017.
  */
 
-public enum Issuer {
-    Unknown("Unknown", "Unknown", null, null, null, null),
-    SMART_CASH_AG("SMART CASH AG", "SMART CASH AG",
-            IssuerKeyStorage.sdkPrivateDataKey, IssuerKeyStorage.GeneratePublicKey(IssuerKeyStorage.sdkPrivateDataKey),
-            IssuerKeyStorage.sdkPrivateTransactionKey, IssuerKeyStorage.GeneratePublicKey(IssuerKeyStorage.sdkPrivateTransactionKey)),
-    TANGEM_SDK("TANGEM SDK", "TANGEM SDK",
-            IssuerKeyStorage.sdkPrivateDataKey, IssuerKeyStorage.GeneratePublicKey(IssuerKeyStorage.sdkPrivateDataKey),
-            IssuerKeyStorage.sdkPrivateTransactionKey, IssuerKeyStorage.GeneratePublicKey(IssuerKeyStorage.sdkPrivateTransactionKey)),
-    TANGEM("TANGEM", "TANGEM", null, IssuerKeyStorage.tangemPublicDataKey, null, IssuerKeyStorage.tangemPublicTransactionKey)
-    ;
+//public enum Issuer {
+//    Unknown("Unknown", "Unknown", null, null, null, null),
+//    SMART_CASH_AG("SMART CASH AG", "SMART CASH AG",
+//            IssuerKeyStorage.sdkPrivateDataKey, IssuerKeyStorage.GeneratePublicKey(IssuerKeyStorage.sdkPrivateDataKey),
+//            IssuerKeyStorage.sdkPrivateTransactionKey, IssuerKeyStorage.GeneratePublicKey(IssuerKeyStorage.sdkPrivateTransactionKey)),
+//    TANGEM_SDK("TANGEM SDK", "TANGEM SDK",
+//            IssuerKeyStorage.sdkPrivateDataKey, IssuerKeyStorage.GeneratePublicKey(IssuerKeyStorage.sdkPrivateDataKey),
+//            IssuerKeyStorage.sdkPrivateTransactionKey, IssuerKeyStorage.GeneratePublicKey(IssuerKeyStorage.sdkPrivateTransactionKey)),
+//    TANGEM("TANGEM", "TANGEM", null, IssuerKeyStorage.tangemPublicDataKey, null, IssuerKeyStorage.tangemPublicTransactionKey)
+//    ;
+//
+//
+//    static class IssuerKeyStorage {
+//        private static final byte[] sdkPrivateDataKey = new byte[]{
+//                (byte) 0x11, (byte) 0x12, (byte) 0x13, (byte) 0x14, (byte) 0x15, (byte) 0x16, (byte) 0x17, (byte) 0x18,
+//                (byte) 0x47, (byte) 0x71, (byte) 0xED, (byte) 0x81, (byte) 0xF2, (byte) 0xBA, (byte) 0xCF, (byte) 0x57,
+//                (byte) 0x47, (byte) 0x9E, (byte) 0x47, (byte) 0x35, (byte) 0xEB, (byte) 0x14, (byte) 0x05, (byte) 0x08,
+//                (byte) 0x39, (byte) 0x27, (byte) 0x37, (byte) 0x2D, (byte) 0x40, (byte) 0xDA, (byte) 0x9E, (byte) 0x92};
+//
+//        private static final byte[] sdkPrivateTransactionKey = new byte[]{
+//                (byte) 0x11, (byte) 0x12, (byte) 0x13, (byte) 0x14, (byte) 0x15, (byte) 0x16, (byte) 0x17, (byte) 0x18,
+//                (byte) 0x47, (byte) 0x71, (byte) 0xED, (byte) 0x81, (byte) 0xF2, (byte) 0xBA, (byte) 0xCF, (byte) 0x57,
+//                (byte) 0x47, (byte) 0x9E, (byte) 0x47, (byte) 0x35, (byte) 0xEB, (byte) 0x14, (byte) 0x05, (byte) 0x08,
+//                (byte) 0x19, (byte) 0x18, (byte) 0x17, (byte) 0x16, (byte) 0x15, (byte) 0x14, (byte) 0x13, (byte) 0x12};
+//
+//        private static byte[] tangemPublicDataKey =  {
+//                (byte) 0x04 ,
+//                (byte) 0x81 ,(byte) 0x96 ,(byte) 0xAA ,(byte) 0x4B ,(byte) 0x41 ,(byte) 0x0A ,(byte) 0xC4 ,(byte) 0x4A,
+//                (byte) 0x3B ,(byte) 0x9C ,(byte) 0xCE ,(byte) 0x18 ,(byte) 0xE7 ,(byte) 0xBE ,(byte) 0x22 ,(byte) 0x6A,
+//                (byte) 0xEA ,(byte) 0x07 ,(byte) 0x0A ,(byte) 0xCC ,(byte) 0x83 ,(byte) 0xA9 ,(byte) 0xCF ,(byte) 0x67,
+//                (byte) 0x54 ,(byte) 0x0F ,(byte) 0xAC ,(byte) 0x49 ,(byte) 0xAF ,(byte) 0x25 ,(byte) 0x12 ,(byte) 0x9F,
+//                (byte) 0x6A ,(byte) 0x53 ,(byte) 0x8A ,(byte) 0x28 ,(byte) 0xAD ,(byte) 0x63 ,(byte) 0x41 ,(byte) 0x35,
+//                (byte) 0x8E ,(byte) 0x3C ,(byte) 0x4F ,(byte) 0x99 ,(byte) 0x63 ,(byte) 0x06 ,(byte) 0x4F ,(byte) 0x7E,
+//                (byte) 0x36 ,(byte) 0x53 ,(byte) 0x72 ,(byte) 0xA6 ,(byte) 0x51 ,(byte) 0xD3 ,(byte) 0x74 ,(byte) 0xE5,
+//                (byte) 0xC2 ,(byte) 0x3C ,(byte) 0xDD ,(byte) 0x37 ,(byte) 0xFD ,(byte) 0x09 ,(byte) 0x9B ,(byte) 0xF2};
+//
+//        private static byte[] tangemPublicTransactionKey =  {
+//                (byte) 0x04 ,
+//                (byte) 0x34 ,(byte) 0x3D ,(byte) 0x40 ,(byte) 0x49 ,(byte) 0x6C ,(byte) 0xBE ,(byte) 0x1F ,(byte) 0xE8,
+//                (byte) 0xA8 ,(byte) 0xC0 ,(byte) 0x26 ,(byte) 0x57 ,(byte) 0x5C ,(byte) 0x43 ,(byte) 0x5A ,(byte) 0x29,
+//                (byte) 0x14 ,(byte) 0x1E ,(byte) 0xA3 ,(byte) 0xBC ,(byte) 0x33 ,(byte) 0x5D ,(byte) 0xA5 ,(byte) 0x54,
+//                (byte) 0x9A ,(byte) 0xB6 ,(byte) 0xC6 ,(byte) 0x46 ,(byte) 0x85 ,(byte) 0xA6 ,(byte) 0x46 ,(byte) 0x84,
+//                (byte) 0x80 ,(byte) 0x36 ,(byte) 0xD4 ,(byte) 0x81 ,(byte) 0xCF ,(byte) 0x9A ,(byte) 0x98 ,(byte) 0x93,
+//                (byte) 0x90 ,(byte) 0xA8 ,(byte) 0xB0 ,(byte) 0x34 ,(byte) 0xB2 ,(byte) 0x29 ,(byte) 0xD9 ,(byte) 0x9B,
+//                (byte) 0xD4 ,(byte) 0x9E ,(byte) 0x6F ,(byte) 0x07 ,(byte) 0xD2 ,(byte) 0xFF ,(byte) 0x02 ,(byte) 0x74,
+//                (byte) 0x6E ,(byte) 0xA2 ,(byte) 0x65 ,(byte) 0xEF ,(byte) 0x99 ,(byte) 0x38 ,(byte) 0x0A ,(byte) 0x80};
+//
+//        public static byte[] GeneratePublicKey(byte[] privateKey) {
+//            try {
+//                return CardCrypto.GeneratePublicKey(privateKey);
+//            }
+//            catch (Exception e)
+//            {
+//                e.printStackTrace();
+//                return null;
+//            }
+//        }
+//    }
+//
+//    private String ID;
+//    private String officialName;
+//    private byte[] privateDataKeyArray;
+//    private byte[] publicDataKeyArray;
+//    private byte[] privateTransactionKeyArray;
+//    private byte[] publicTransactionKeyArray;
+//
+//    Issuer(String id, String officialName, byte[] privateDataKey, byte[] publicDataKey, byte[] privateTransactionKey, byte[] publicTransactionKey) {
+//        this.ID = id;
+//        this.officialName = officialName;
+//        this.privateDataKeyArray = privateDataKey;
+//        this.privateTransactionKeyArray = privateTransactionKey;
+//        this.publicDataKeyArray = publicDataKey;
+//        this.publicTransactionKeyArray = publicTransactionKey;
+//    }
+//
+//    public byte[] getPublicDataKey() {
+//        return publicDataKeyArray;
+//    }
+//
+//    public byte[] getPublicTransactionKey() {
+//        return publicTransactionKeyArray;
+//    }
+//
+//    public byte[] getPrivateDataKey() {
+//        return privateDataKeyArray;
+//    }
+//
+//    public byte[] getPrivateTransactionKey() {
+//        return privateTransactionKeyArray;
+//    }
+//
+//    public byte[] getID() {
+//        return ID.getBytes();
+//    }
+//
+//    public String getOfficialName() {
+//        return officialName;
+//    }
+//
+//    public static Issuer FindIssuer(String ID, byte[] publicDataKey) {
+//        Issuer[] issuers = Issuer.values();
+//        for (int i = 1; i < issuers.length; i++) {
+//            if (issuers[i].ID.equals(ID) && Arrays.equals(issuers[i].getPublicDataKey(), publicDataKey)) {
+//                return issuers[i];
+//            }
+//        }
+//        return Issuer.Unknown;
+//    }
+//
+//}
 
+public class Issuer {
 
-    static class IssuerKeyStorage {
-        private static final byte[] sdkPrivateDataKey = new byte[]{
-                (byte) 0x11, (byte) 0x12, (byte) 0x13, (byte) 0x14, (byte) 0x15, (byte) 0x16, (byte) 0x17, (byte) 0x18,
-                (byte) 0x47, (byte) 0x71, (byte) 0xED, (byte) 0x81, (byte) 0xF2, (byte) 0xBA, (byte) 0xCF, (byte) 0x57,
-                (byte) 0x47, (byte) 0x9E, (byte) 0x47, (byte) 0x35, (byte) 0xEB, (byte) 0x14, (byte) 0x05, (byte) 0x08,
-                (byte) 0x39, (byte) 0x27, (byte) 0x37, (byte) 0x2D, (byte) 0x40, (byte) 0xDA, (byte) 0x9E, (byte) 0x92};
+    static class KeyPair
+    {
+        String privateKey;
+        String publicKey;
 
-        private static final byte[] sdkPrivateTransactionKey = new byte[]{
-                (byte) 0x11, (byte) 0x12, (byte) 0x13, (byte) 0x14, (byte) 0x15, (byte) 0x16, (byte) 0x17, (byte) 0x18,
-                (byte) 0x47, (byte) 0x71, (byte) 0xED, (byte) 0x81, (byte) 0xF2, (byte) 0xBA, (byte) 0xCF, (byte) 0x57,
-                (byte) 0x47, (byte) 0x9E, (byte) 0x47, (byte) 0x35, (byte) 0xEB, (byte) 0x14, (byte) 0x05, (byte) 0x08,
-                (byte) 0x19, (byte) 0x18, (byte) 0x17, (byte) 0x16, (byte) 0x15, (byte) 0x14, (byte) 0x13, (byte) 0x12};
-
-        private static byte[] tangemPublicDataKey =  {
-                (byte) 0x04 ,
-                (byte) 0x81 ,(byte) 0x96 ,(byte) 0xAA ,(byte) 0x4B ,(byte) 0x41 ,(byte) 0x0A ,(byte) 0xC4 ,(byte) 0x4A,
-                (byte) 0x3B ,(byte) 0x9C ,(byte) 0xCE ,(byte) 0x18 ,(byte) 0xE7 ,(byte) 0xBE ,(byte) 0x22 ,(byte) 0x6A,
-                (byte) 0xEA ,(byte) 0x07 ,(byte) 0x0A ,(byte) 0xCC ,(byte) 0x83 ,(byte) 0xA9 ,(byte) 0xCF ,(byte) 0x67,
-                (byte) 0x54 ,(byte) 0x0F ,(byte) 0xAC ,(byte) 0x49 ,(byte) 0xAF ,(byte) 0x25 ,(byte) 0x12 ,(byte) 0x9F,
-                (byte) 0x6A ,(byte) 0x53 ,(byte) 0x8A ,(byte) 0x28 ,(byte) 0xAD ,(byte) 0x63 ,(byte) 0x41 ,(byte) 0x35,
-                (byte) 0x8E ,(byte) 0x3C ,(byte) 0x4F ,(byte) 0x99 ,(byte) 0x63 ,(byte) 0x06 ,(byte) 0x4F ,(byte) 0x7E,
-                (byte) 0x36 ,(byte) 0x53 ,(byte) 0x72 ,(byte) 0xA6 ,(byte) 0x51 ,(byte) 0xD3 ,(byte) 0x74 ,(byte) 0xE5,
-                (byte) 0xC2 ,(byte) 0x3C ,(byte) 0xDD ,(byte) 0x37 ,(byte) 0xFD ,(byte) 0x09 ,(byte) 0x9B ,(byte) 0xF2};
-
-        private static byte[] tangemPublicTransactionKey =  {
-                (byte) 0x04 ,
-                (byte) 0x34 ,(byte) 0x3D ,(byte) 0x40 ,(byte) 0x49 ,(byte) 0x6C ,(byte) 0xBE ,(byte) 0x1F ,(byte) 0xE8,
-                (byte) 0xA8 ,(byte) 0xC0 ,(byte) 0x26 ,(byte) 0x57 ,(byte) 0x5C ,(byte) 0x43 ,(byte) 0x5A ,(byte) 0x29,
-                (byte) 0x14 ,(byte) 0x1E ,(byte) 0xA3 ,(byte) 0xBC ,(byte) 0x33 ,(byte) 0x5D ,(byte) 0xA5 ,(byte) 0x54,
-                (byte) 0x9A ,(byte) 0xB6 ,(byte) 0xC6 ,(byte) 0x46 ,(byte) 0x85 ,(byte) 0xA6 ,(byte) 0x46 ,(byte) 0x84,
-                (byte) 0x80 ,(byte) 0x36 ,(byte) 0xD4 ,(byte) 0x81 ,(byte) 0xCF ,(byte) 0x9A ,(byte) 0x98 ,(byte) 0x93,
-                (byte) 0x90 ,(byte) 0xA8 ,(byte) 0xB0 ,(byte) 0x34 ,(byte) 0xB2 ,(byte) 0x29 ,(byte) 0xD9 ,(byte) 0x9B,
-                (byte) 0xD4 ,(byte) 0x9E ,(byte) 0x6F ,(byte) 0x07 ,(byte) 0xD2 ,(byte) 0xFF ,(byte) 0x02 ,(byte) 0x74,
-                (byte) 0x6E ,(byte) 0xA2 ,(byte) 0x65 ,(byte) 0xEF ,(byte) 0x99 ,(byte) 0x38 ,(byte) 0x0A ,(byte) 0x80};
-
-        public static byte[] GeneratePublicKey(byte[] privateKey) {
-            try {
-                return CardCrypto.GeneratePublicKey(privateKey);
+        byte[] getPrivateKey() throws Exception {
+            if (privateKey != null) {
+                return CardCrypto.GeneratePublicKey(Util.hexToBytes(privateKey));
+            } else {
+                throw new Exception("No private key!");
             }
-            catch (Exception e)
+        }
+
+        byte[] getPublicKey() throws Exception {
+            if (publicKey == null) {
+                if (privateKey != null) {
+                    return CardCrypto.GeneratePublicKey(Util.hexToBytes(privateKey));
+                } else {
+                    throw new Exception("Invalid key format: no public and no private");
+                }
+            } else {
+                return Util.hexToBytes(publicKey);
+            }
+        }
+
+    }
+    String id;
+    String officialName;
+    KeyPair dataKey;
+    KeyPair transactionKey;
+
+    public String getID() {
+        return id;
+    }
+
+    private static List<Issuer> instances=new ArrayList<>();
+
+    public static boolean needInit() {
+        return instances.size()==0;
+    }
+
+    public static void Init(Context mContext){
+        try {
+            JsonArray jaIssuers;
+            JsonParser jsonParser=new JsonParser();
+            jaIssuers=jsonParser.parse(ReadJSONResource(mContext, R.raw.issuers)).getAsJsonArray();
+            instances.clear();
+
+            Issuer unknown=new Issuer();
+            unknown.id="UNKNOWN";
+            unknown.officialName="UNKNOWN";
+            instances.add(unknown);
+
+            for(JsonElement jeIssuer: jaIssuers)
             {
-                e.printStackTrace();
-                return null;
+                Issuer instance=new Gson().fromJson(jeIssuer,Issuer.class);
+                instances.add(instance);
             }
+
+        } catch (Exception e) {
+            e.printStackTrace();
         }
     }
 
-    private String ID;
-    private String officialName;
-    private byte[] privateDataKeyArray;
-    private byte[] publicDataKeyArray;
-    private byte[] privateTransactionKeyArray;
-    private byte[] publicTransactionKeyArray;
+    static String ReadJSONResource(Context mContext, int id) {
+        Resources resources = mContext.getResources();
+        InputStream resourceReader = resources.openRawResource(id);
+        Writer writer = new StringWriter();
+        try {
+            try(BufferedReader reader = new BufferedReader(new InputStreamReader(resourceReader, "UTF-8"))) {
+                String line = reader.readLine();
+                while (line != null) {
+                    writer.write(line);
+                    line = reader.readLine();
+                }
+            }
+        } catch (Exception e) {
+            Log.e("ReadJSONResource", "Unhandled exception while using JSONResourceReader", e);
+        } finally {
+            try {
+                resourceReader.close();
+            } catch (Exception e) {
+                Log.e("ReadJSONResource", "Unhandled exception while using JSONResourceReader", e);
+            }
+        }
 
-    Issuer(String id, String officialName, byte[] privateDataKey, byte[] publicDataKey, byte[] privateTransactionKey, byte[] publicTransactionKey) {
-        this.ID = id;
-        this.officialName = officialName;
-        this.privateDataKeyArray = privateDataKey;
-        this.privateTransactionKeyArray = privateTransactionKey;
-        this.publicDataKeyArray = publicDataKey;
-        this.publicTransactionKeyArray = publicTransactionKey;
+        return writer.toString();
     }
 
-    public byte[] getPublicDataKey() {
-        return publicDataKeyArray;
+    public byte[] getPublicDataKey() throws Exception {
+        if( dataKey==null )
+            throw new Exception("Data key not specified!");
+        return dataKey.getPublicKey();
     }
 
-    public byte[] getPublicTransactionKey() {
-        return publicTransactionKeyArray;
+    public byte[] getPublicTransactionKey() throws Exception {
+        if( dataKey==null )
+            throw new Exception("Transaction key not specified!");
+        return transactionKey.getPublicKey();
     }
 
-    public byte[] getPrivateDataKey() {
-        return privateDataKeyArray;
+    public byte[] getPrivateDataKey() throws Exception {
+        if( dataKey==null )
+            throw new Exception("Data key not specified!");
+        return dataKey.getPrivateKey();
     }
 
-    public byte[] getPrivateTransactionKey() {
-        return privateTransactionKeyArray;
-    }
-
-    public byte[] getID() {
-        return ID.getBytes();
+    public byte[] getPrivateTransactionKey() throws Exception {
+        if( transactionKey==null )
+            throw new Exception("Transaction key not specified!");
+        return transactionKey.getPrivateKey();
     }
 
     public String getOfficialName() {
-        return officialName;
+        return officialName!=null?officialName:id;
+    }
+
+    public static Issuer FindIssuer(String ID) {
+        for (int i = 0; i < instances.size(); i++) {
+            try {
+                if (instances.get(i).id.equals(ID)) {
+                    return instances.get(i);
+                }
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        }
+        return Unknown();
     }
 
     public static Issuer FindIssuer(String ID, byte[] publicDataKey) {
-        Issuer[] issuers = Issuer.values();
-        for (int i = 1; i < issuers.length; i++) {
-            if (issuers[i].ID.equals(ID) && Arrays.equals(issuers[i].getPublicDataKey(), publicDataKey)) {
-                return issuers[i];
+        for (int i = 0; i < instances.size(); i++) {
+            try {
+                if (instances.get(i).id.equals(ID) && Arrays.equals(instances.get(i).getPublicDataKey(), publicDataKey)) {
+                    return instances.get(i);
+                }
+            } catch (Exception e) {
+                e.printStackTrace();
             }
         }
-        return Issuer.Unknown;
+        return Unknown();
     }
 
+    public static Issuer Unknown() {
+        return instances.get(0);
+    }
 }

app/src/main/java/com/tangem/domain/wallet/TangemCard.java

@@ -578,7 +578,7 @@ public class TangemCard {
         return health == 0;
     }
 
-    private Issuer issuer = Issuer.Unknown;
+    private Issuer issuer = Issuer.Unknown();
 
     public void setIssuer(Issuer issuer) {
         this.issuer = issuer;
@@ -1202,7 +1202,7 @@ public class TangemCard {
         if (signingMethod != null) B.putString("signingMethod", signingMethod.name());
         if (manufacturer != null) B.putString("Manufacturer", manufacturer.name());
         if (encryptionMode != null) B.putString("EncryptionMode", encryptionMode.name());
-        if (issuer != null) B.putString("Issuer", issuer.name());
+        if (issuer != null) B.putString("Issuer", issuer.getID());
         if (firmwareVersion != null) B.putString("FirmwareVersion", firmwareVersion);
         B.putString("BalanceDecimal", balanceDecimal);
         B.putString("BalanceDecimalAlter", balanceDecimalAlter);
@@ -1291,7 +1291,7 @@ public class TangemCard {
         else
             encryptionMode = null;
 
-        if (B.containsKey("Issuer")) issuer = Issuer.valueOf(B.getString("Issuer"));
+        if (B.containsKey("Issuer")) issuer = Issuer.FindIssuer(B.getString("Issuer"));
         if (B.containsKey("FirmwareVersion")) firmwareVersion = B.getString("FirmwareVersion");
 
         cardPublicKeyValid = B.getBoolean("CardPublicKeyValid");

app/src/main/java/com/tangem/presentation/activity/MainActivity.java

@@ -24,6 +24,7 @@ import android.widget.TextView;
 import com.scottyab.rootbeer.RootBeer;
 import com.skyfishjy.library.RippleBackground;
 import com.tangem.domain.wallet.DeviceNFCAntennaLocation;
+import com.tangem.domain.wallet.Issuer;
 import com.tangem.domain.wallet.LastSignStorage;
 import com.tangem.domain.wallet.Logger;
 import com.tangem.domain.wallet.PINStorage;
@@ -216,6 +217,10 @@ public class MainActivity extends AppCompatActivity implements PopupMenu.OnMenuI
         if (LastSignStorage.needInit()) {
             LastSignStorage.Init(context);
         }
+        if(Issuer.needInit())
+        {
+            Issuer.Init(context);
+        }
     }
 
     public void showCleanButton() {

app/src/main/res/raw/fw_hashes.json

@@ -0,0 +1,36 @@
+[
+  {
+    "fw":"1.24r",
+    "challenge":"00000000000000000000000000000001",
+    "sha-256":[
+      {"block":0,"count":1,"digest":"9B091DF443FE951D27AA8843517096DC421433F5603EBC566B11891F867E3D18"},
+      {"block":1,"count":1,"digest":"B4F723EE79075C8C00FA17D037BF10528BB0C7CF421539EE15F4A397204C87AF"},
+      {"block":2,"count":1,"digest":"1258585B438B6BC8F41FC22AFF383C86690E984E84E96AA752C9A54954DF731A"},
+      {"block":3,"count":1,"digest":"14082C75D6AA533A06E9B764642F97B5783FED91BD1173EFADC3CF57D8769AAE"},
+      {"block":4,"count":1,"digest":"A8F6CB02D56933361127072BB0D89999020CE196AE9718E9CF019DCCC9437E85"},
+      {"block":5,"count":1,"digest":"491604BA2A2F6EE03A2B4812958F0356D745678FB0ABABF0109A9E8F59099D9D"},
+      {"block":6,"count":1,"digest":"B2F057FF8B83343BC40058CA459F3C63B9670ABCD059730BE70223AEBDC88D77"},
+      {"block":7,"count":1,"digest":"73F4391010345E27745A1AFEC93C02B2CA460D9EAB437605F82A18281DF17DCE"},
+      {"block":8,"count":1,"digest":"74588EBB6704DD3DB9ECDFE6B85EC2872BD6A1F7C73E080E57697D3FF8DDD470"},
+      {"block":9,"count":1,"digest":"3B382C35ADBBF206B0A6B216EE95AF2321EE34148E93BBFECCF275AB13ED08A2"},
+      {"block":11500,"count":1,"digest":"21DDEC9788E3EA04663297AD0208F2714F139434E3540EBB7C96150EE1D320C9"},
+      {"block":11501,"count":1,"digest":"C545C5D092D1EBC4BA266C139CE0F2A399E4D23E74EB4EBD0E53019AB58CB486"},
+      {"block":0,"count":0,"digest":"C689C50352E9F6E41BF2E6EC852D8466814A51018F40BE32BAADEE9C2A9E6B6D"}
+    ],
+    "crc-16":[
+      {"block":0,"count":1,"digest":"1BFC"},
+      {"block":1,"count":1,"digest":"D58D"},
+      {"block":2,"count":1,"digest":"7E3E"},
+      {"block":3,"count":1,"digest":"14EA"},
+      {"block":4,"count":1,"digest":"014F"},
+      {"block":5,"count":1,"digest":"5FF0"},
+      {"block":6,"count":1,"digest":"7D3A"},
+      {"block":7,"count":1,"digest":"702C"},
+      {"block":8,"count":1,"digest":"CC22"},
+      {"block":9,"count":1,"digest":"392C"},
+      {"block":11500,"count":1,"digest":"5FCB"},
+      {"block":11501,"count":1,"digest":"FF77"},
+      {"block":0,"count":0,"digest":"D07B"}
+    ]
+  }
+]

app/src/main/res/raw/issuers.json

@@ -0,0 +1,39 @@
+[
+  {
+    "id": "TANGEM SDK",
+    "dataKey": {
+      "privateKey": "11121314151617184771ED81F2BACF57479E4735EB1405083927372D40DA9E92"
+    },
+    "transactionKey": {
+      "privateKey": "11121314151617184771ED81F2BACF57479E4735EB1405081918171615141312"
+    }
+  },
+  {
+    "id": "TANGEM SDK OLD",
+    "dataKey": {
+      "privateKey": "11121314151617184771ED81F2BACF57479E4735EB1405083927372D40DA9E92"
+    },
+    "transactionKey": {
+      "privateKey": "11121314151617184771ED81F2BACF57479E4735EB1405083927372D40DA9E92"
+    }
+  },
+  {
+    "id": "TANGEM",
+    "dataKey": {
+      "publicKey": "048196AA4B410AC44A3B9CCE18E7BE226AEA070ACC83A9CF67540FAC49AF25129F6A538A28AD6341358E3C4F9963064F7E365372A651D374E5C23CDD37FD099BF2"
+    },
+    "transactionKey": {
+      "publicKey": "04343D40496CBE1FE8A8C026575C435A29141EA3BC335DA5549AB6C64685A646848036D481CF9A989390A8B034B229D99BD49E6F07D2FF02746EA265EF99380A80"
+    }
+  },
+  {
+    "id": "SUPERBLOOM",
+    "dataKey": {
+      "publicKey": "04EAB7F2444CFFA2E9CB4AA01CF1CA3694888811BDF0F8E0CDBCCFB5F497F14A5B86655FEF0C7E8F86841B0C14660E09F28DDFB9690F7302DA56F661A6A064564E"
+    },
+    "transactionKey": {
+      "publicKey": "04D292BFC802FFA70ABB1C094A19F6C6766DD353114C25415871BE4586129648CFD77B22FBC1AF3C612497732A04CF845B41D760AFDD820051AB250798503DB340"
+    }
+  }
+
+]