feat(Crypto-sskr): added crypto-sskr UR support

Added tests

build.gradle

@@ -16,7 +16,7 @@ apply plugin: 'com.bmuschko.nexus'
 
 archivesBaseName = 'hummingbird'
 group 'com.sparrowwallet'
-version '1.6.5'
+version '1.6.6'
 
 repositories {
     mavenCentral()

src/main/java/com/sparrowwallet/hummingbird/UR.java

@@ -76,6 +76,8 @@ public class UR {
                 return CryptoPSBT.fromCbor(item);
             } else if(registryType == RegistryType.CRYPTO_ACCOUNT) {
                 return CryptoAccount.fromCbor(item);
+            } else if(registryType == RegistryType.CRYPTO_SSKR) {
+                return CryptoSskr.fromCbor(item);
             }
         } catch(CborException e) {
             throw new InvalidCBORException(e.getMessage());

src/main/java/com/sparrowwallet/hummingbird/registry/CryptoSskr.java

@@ -0,0 +1,34 @@
+package com.sparrowwallet.hummingbird.registry;
+
+import java.util.Arrays;
+
+import co.nstant.in.cbor.model.ByteString;
+import co.nstant.in.cbor.model.DataItem;
+
+public class CryptoSskr extends RegistryItem {
+
+    private final byte[] split;
+
+    public CryptoSskr(byte[] split) {
+        this.split = split;
+    }
+
+    public byte[] getSplit() {
+        return split;
+    }
+
+    public DataItem toCbor() {
+        return new ByteString(split);
+    }
+
+    @Override
+    public RegistryType getRegistryType() {
+        return RegistryType.CRYPTO_SSKR;
+    }
+
+    public static CryptoSskr fromCbor(DataItem item) {
+        byte[] itemBytes = ((ByteString)item).getBytes();
+        byte[] normalisedSplit = Arrays.copyOfRange(itemBytes, 1, itemBytes.length);
+        return new CryptoSskr(normalisedSplit);
+    }
+}

src/main/java/com/sparrowwallet/hummingbird/registry/RegistryType.java

@@ -20,7 +20,7 @@ public enum RegistryType {
     CRYPTO_ECKEY("crypto-eckey", 306, CryptoECKey.class),
     CRYPTO_ADDRESS("crypto-address", 307, CryptoAddress.class),
     CRYPTO_OUTPUT("crypto-output", 308, CryptoOutput.class),
-    CRYPTO_SSKR("crypto-sskr", 309, null),
+    CRYPTO_SSKR("crypto-sskr", 309, CryptoSskr.class),
     CRYPTO_PSBT("crypto-psbt", 310, CryptoPSBT.class),
     CRYPTO_ACCOUNT("crypto-account", 311, CryptoAccount.class);
 

src/test/java/com/sparrowwallet/hummingbird/registry/CryptoSskrTest.java

@@ -0,0 +1,37 @@
+package com.sparrowwallet.hummingbird.registry;
+
+import com.sparrowwallet.hummingbird.TestUtils;
+import com.sparrowwallet.hummingbird.UR;
+import com.sparrowwallet.hummingbird.URDecoder;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+
+import co.nstant.in.cbor.CborDecoder;
+import co.nstant.in.cbor.CborException;
+import co.nstant.in.cbor.model.ByteString;
+import co.nstant.in.cbor.model.DataItem;
+import co.nstant.in.cbor.model.UnicodeString;
+
+public class CryptoSskrTest {
+
+    private final String splitVector = "4bbf1101025abd490ee65b6084859854ee67736e75";
+    private final String urVector = "ur:crypto-sskr/gogrrsbyadaohtrygabavahphnlrlpmkghwyiojkjtkpmdkncfjp";
+
+    @Test
+    public void testSskrToUR() {
+        byte[] data = TestUtils.hexToBytes(splitVector);
+        CryptoSskr cryptoSskr = new CryptoSskr(data);
+        Assert.assertEquals(urVector, cryptoSskr.toUR().toString());
+    }
+
+    @Test
+    public void testURtoSskr() throws UR.URException {
+        UR ur = URDecoder.decode(urVector);
+        CryptoSskr cryptoSskr = CryptoSskr.fromCbor(new ByteString(ur.getCborBytes()));
+        Assert.assertEquals(splitVector, TestUtils.bytesToHex(cryptoSskr.getSplit()));
+    }
+}