Fix --sign-tx in ethkey.

ethkey/KeyAux.h

@@ -228,19 +228,18 @@ public:
 		{
 			if (h128 u = fromUUID(_signKey))
 				return Secret(secretStore().secret(u, [&](){ return getPassword("Enter password for key: "); }));
-			else if (Address a = Address(_signKey))
+			if (_signKey.substr(0, 6) == "brain:")
-				return keyManager().secret(a, [&](){ return getPassword("Enter password for key (hint:" + keyManager().passwordHint(a) + "): "); });
-			else if (_signKey.substr(0, 6) == "brain:")
 				return KeyManager::brain(_signKey.substr(6));
-			else if (_signKey == "brain")
+			if (_signKey == "brain")
 				return KeyManager::brain(getPassword("Enter brain wallet phrase: "));
-			else
+			Address a;
-			{
+			DEV_IGNORE_EXCEPTIONS(a = Address(_signKey));
+			if (a)
+				return keyManager().secret(a, [&](){ return getPassword("Enter password for key (hint:" + keyManager().passwordHint(a) + "): "); });
 			cerr << "Bad file, UUID and address: " << _signKey << endl;
 			exit(-1);
 		}
 	}
-	}
 
 	void execute()
 	{

libdevcore/FixedHash.cpp

@@ -30,7 +30,14 @@ boost::random_device dev::s_fixedHashEngine;
 
 h128 dev::fromUUID(std::string const& _uuid)
 {
+	try
+	{
 		return h128(boost::replace_all_copy(_uuid, "-", ""));
+	}
+	catch (...)
+	{
+		return h128();
+	}
 }
 
 std::string dev::toUUID(h128 const& _uuid)