Add fuzz tests for obfuscated2

mtglib/internal/obfuscated2/server_handshake_fuzz_test.go

@@ -0,0 +1,58 @@
+package obfuscated2_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/mock"
+)
+
+func FuzzServerSend(f *testing.F) {
+	f.Add([]byte{1,2,3,4,5})
+
+	f.Fuzz(func(t *testing.T, data []byte) {
+		handshakeData := NewServerHandshakeTestData(t)
+
+		handshakeData.connMock.
+			On("Write", mock.Anything).
+			Return(len(data), nil).
+			Once().
+			Run(func(args mock.Arguments) {
+				message := make([]byte, len(data))
+				handshakeData.decryptor.XORKeyStream(message, args.Get(0).([]byte))
+				assert.Equal(t, message, data)
+			})
+
+		n, err := handshakeData.proxyConn.Write(data)
+
+		assert.EqualValues(t, len(data), n)
+		assert.NoError(t, err)
+		handshakeData.connMock.AssertExpectations(t)
+	})
+}
+
+func FuzzServerReceive(f *testing.F) {
+	f.Add([]byte{1,2,3,4,5})
+
+	f.Fuzz(func(t *testing.T, data []byte) {
+		handshakeData := NewServerHandshakeTestData(t)
+		buffer := make([]byte, len(data))
+
+		handshakeData.connMock.
+			On("Read", mock.Anything).
+			Return(len(data), nil).
+			Once().
+			Run(func(args mock.Arguments) {
+				message := make([]byte, len(data))
+				handshakeData.encryptor.XORKeyStream(message, data)
+				copy(args.Get(0).([]byte), message)
+			})
+
+		n, err := handshakeData.proxyConn.Read(buffer)
+
+		assert.EqualValues(t, len(data), n)
+		assert.NoError(t, err)
+		assert.Equal(t, data, buffer)
+		handshakeData.connMock.AssertExpectations(t)
+	})
+}