Signatures work

domain/src/main/java/ch/dissem/bitmessage/entity/ObjectMessage.java

@@ -17,6 +17,7 @@
 package ch.dissem.bitmessage.entity;
 
 import ch.dissem.bitmessage.entity.payload.ObjectPayload;
+import ch.dissem.bitmessage.entity.payload.ObjectType;
 import ch.dissem.bitmessage.entity.payload.Pubkey;
 import ch.dissem.bitmessage.entity.valueobject.InventoryVector;
 import ch.dissem.bitmessage.entity.valueobject.PrivateKey;
@@ -98,30 +99,47 @@ public class ObjectMessage implements MessagePayload {
         return payload.isSigned();
     }
 
-    private byte[] getBytesToSign() throws IOException {
+    private byte[] getBytesToSign() {
+        try {
             ByteArrayOutputStream out = new ByteArrayOutputStream();
             writeHeaderWithoutNonce(out);
             payload.writeBytesToSign(out);
             return out.toByteArray();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
     }
 
     public void sign(PrivateKey key) {
-        // TODO
+        if (payload.isSigned()) {
-//        Security.
+            payload.setSignature(Security.getSignature(getBytesToSign(), key));
+        }
     }
 
     public void decrypt(PrivateKey key) throws IOException {
-        if (payload instanceof Encrypted){
+        if (payload instanceof Encrypted) {
             ((Encrypted) payload).decrypt(key.getPrivateEncryptionKey());
         }
     }
 
     public void decrypt(byte[] privateEncryptionKey) throws IOException {
-        if (payload instanceof Encrypted){
+        if (payload instanceof Encrypted) {
             ((Encrypted) payload).decrypt(privateEncryptionKey);
         }
     }
 
+    public void encrypt(byte[] publicEncryptionKey) throws IOException{
+        if (payload instanceof Encrypted){
+            ((Encrypted) payload).encrypt(publicEncryptionKey);
+        }
+    }
+
+    public void encrypt(Pubkey publicKey) throws IOException{
+        if (payload instanceof Encrypted){
+            ((Encrypted) payload).encrypt(publicKey.getEncryptionKey());
+        }
+    }
+
     public boolean isSignatureValid(Pubkey pubkey) throws IOException {
         if (isEncrypted()) throw new IllegalStateException("Payload must be decrypted first");
         return Security.isSignatureValid(getBytesToSign(), payload.getSignature(), pubkey);
@@ -176,6 +194,11 @@ public class ObjectMessage implements MessagePayload {
             return this;
         }
 
+        public Builder objectType(ObjectType objectType) {
+            this.objectType = objectType.getNumber();
+            return this;
+        }
+
         public Builder version(long version) {
             this.version = version;
             return this;

domain/src/main/java/ch/dissem/bitmessage/entity/payload/V4Pubkey.java

@@ -123,4 +123,9 @@ public class V4Pubkey extends Pubkey implements Encrypted {
     public void setSignature(byte[] signature) {
         decrypted.setSignature(signature);
     }
+
+    @Override
+    public boolean isSigned() {
+        return true;
+    }
 }

domain/src/main/java/ch/dissem/bitmessage/utils/Security.java

@@ -22,14 +22,11 @@ import ch.dissem.bitmessage.factory.Factory;
 import ch.dissem.bitmessage.ports.ProofOfWorkEngine;
 import org.bouncycastle.asn1.x9.X9ECParameters;
 import org.bouncycastle.crypto.ec.CustomNamedCurves;
-import org.bouncycastle.jce.ECNamedCurveTable;
-import org.bouncycastle.jce.ECPointUtil;
 import org.bouncycastle.jce.provider.BouncyCastleProvider;
-import org.bouncycastle.jce.spec.ECNamedCurveSpec;
 import org.bouncycastle.jce.spec.ECParameterSpec;
+import org.bouncycastle.jce.spec.ECPrivateKeySpec;
 import org.bouncycastle.jce.spec.ECPublicKeySpec;
 import org.bouncycastle.math.ec.ECPoint;
-import org.bouncycastle.util.encoders.Hex;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -185,7 +182,6 @@ public class Security {
     }
 
     public static boolean isSignatureValid(byte[] bytesToSign, byte[] signature, Pubkey pubkey) {
-        ECPoint W = keyToPoint(pubkey.getSigningKey());
         try {
             ECParameterSpec spec = new ECParameterSpec(
                     EC_CURVE_PARAMETERS.getCurve(),
@@ -195,7 +191,8 @@ public class Security {
                     EC_CURVE_PARAMETERS.getSeed()
             );
 
-            KeySpec keySpec = new ECPublicKeySpec(W, spec);
+            ECPoint Q = keyToPoint(pubkey.getSigningKey());
+            KeySpec keySpec = new ECPublicKeySpec(Q, spec);
             PublicKey publicKey = KeyFactory.getInstance("ECDSA", "BC").generatePublic(keySpec);
 
             Signature sig = Signature.getInstance("ECDSA", "BC");
@@ -206,4 +203,27 @@ public class Security {
             throw new RuntimeException(e);
         }
     }
+
+    public static byte[] getSignature(byte[] data, ch.dissem.bitmessage.entity.valueobject.PrivateKey privateKey) {
+        try {
+            ECParameterSpec spec = new ECParameterSpec(
+                    EC_CURVE_PARAMETERS.getCurve(),
+                    EC_CURVE_PARAMETERS.getG(),
+                    EC_CURVE_PARAMETERS.getN(),
+                    EC_CURVE_PARAMETERS.getH(),
+                    EC_CURVE_PARAMETERS.getSeed()
+            );
+
+            BigInteger d = keyToBigInt(privateKey.getPrivateSigningKey());
+            KeySpec keySpec = new ECPrivateKeySpec(d, spec);
+            PrivateKey privKey = KeyFactory.getInstance("ECDSA", "BC").generatePrivate(keySpec);
+
+            Signature sig = Signature.getInstance("ECDSA", "BC");
+            sig.initSign(privKey);
+            sig.update(data);
+            return sig.sign();
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
 }

domain/src/test/java/ch/dissem/bitmessage/EncryptionTest.java

@@ -14,11 +14,12 @@
  * limitations under the License.
  */
 
-package ch.dissem.bitmessage.utils;
+package ch.dissem.bitmessage;
 
 import ch.dissem.bitmessage.entity.payload.CryptoBox;
 import ch.dissem.bitmessage.entity.payload.GenericPayload;
 import ch.dissem.bitmessage.entity.valueobject.PrivateKey;
+import ch.dissem.bitmessage.utils.Security;
 import org.junit.Ignore;
 import org.junit.Test;
 

domain/src/test/java/ch/dissem/bitmessage/SignatureTest.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2015 Christian Basler
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ch.dissem.bitmessage;
+
+import ch.dissem.bitmessage.entity.BitmessageAddress;
+import ch.dissem.bitmessage.entity.ObjectMessage;
+import ch.dissem.bitmessage.entity.payload.ObjectType;
+import ch.dissem.bitmessage.entity.payload.Pubkey;
+import ch.dissem.bitmessage.entity.valueobject.PrivateKey;
+import ch.dissem.bitmessage.utils.TestUtils;
+import org.junit.Test;
+
+import java.io.IOException;
+
+import static org.junit.Assert.assertTrue;
+
+public class SignatureTest {
+    @Test
+    public void ensureValidationWorks() throws IOException {
+        ObjectMessage object = TestUtils.loadObjectMessage(3, "V3Pubkey.payload");
+        Pubkey pubkey = (Pubkey) object.getPayload();
+        assertTrue(object.isSignatureValid(pubkey));
+    }
+
+    @Test
+    public void ensureSigningWorks() throws IOException {
+        PrivateKey privateKey = new PrivateKey(1, 1000, 1000);
+        BitmessageAddress address = new BitmessageAddress(privateKey);
+
+        ObjectMessage objectMessage = new ObjectMessage.Builder()
+                .objectType(ObjectType.PUBKEY)
+                .stream(1)
+                .version(1)
+                .payload(privateKey.getPubkey())
+                .build();
+        objectMessage.sign(privateKey);
+
+        assertTrue(objectMessage.isSignatureValid(privateKey.getPubkey()));
+    }
+}