dummy DSA (for sim - dont run on live net)

core/java/src/net/i2p/I2PAppContext.java

@@ -8,6 +8,7 @@ import net.i2p.client.naming.NamingService;
 import net.i2p.crypto.AESEngine;
 import net.i2p.crypto.CryptixAESEngine;
 import net.i2p.crypto.DSAEngine;
+import net.i2p.crypto.DummyDSAEngine;
 import net.i2p.crypto.DummyElGamalEngine;
 import net.i2p.crypto.ElGamalAESEngine;
 import net.i2p.crypto.ElGamalEngine;
@@ -373,8 +374,12 @@ public class I2PAppContext {
     }
     private void initializeDSA() {
         synchronized (this) {
-            if (_dsa == null)
-                _dsa = new DSAEngine(this);
+            if (_dsa == null) {
+                if ("off".equals(getProperty("i2p.encryption", "on")))
+                    _dsa = new DummyDSAEngine(this);
+                else
+                    _dsa = new DSAEngine(this);
+            }
             _dsaInitialized = true;
         }
     }

core/java/src/net/i2p/crypto/DummyDSAEngine.java

+package net.i2p.crypto;
+
+import net.i2p.I2PAppContext;
+import net.i2p.data.Hash;
+import net.i2p.data.Signature;
+import net.i2p.data.SigningPrivateKey;
+import net.i2p.data.SigningPublicKey;
+import net.i2p.util.Log;
+import net.i2p.util.NativeBigInteger;
+
+/**
+ * Stub that offers no authentication.
+ *
+ */
+public class DummyDSAEngine extends DSAEngine {
+    public DummyDSAEngine(I2PAppContext context) {
+        super(context);
+    }
+    
+    public boolean verifySignature(Signature signature, byte signedData[], SigningPublicKey verifyingKey) {
+        return true;
+    }
+
+    public Signature sign(byte data[], SigningPrivateKey signingKey) {
+        Signature sig = new Signature();
+        sig.setData(Signature.FAKE_SIGNATURE);
+        return sig;
+    }
+}
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