Add new obfuscation package

mtglib/internal/obfuscation/handshake_frame_fuzz_test.go

@@ -0,0 +1,33 @@
+package obfuscation
+
+import (
+	"encoding/binary"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func FuzzGenerateHandshakeFrame(f *testing.F) {
+	f.Fuzz(func(t *testing.T, arg int16) {
+		frame := generateHandshake(int(arg))
+
+		assert.NotEqualValues(t, 0xef, frame.data[0])
+
+		firstBytes := binary.LittleEndian.Uint32(frame.data[:4])
+		assert.NotEqualValues(t, 0x44414548, firstBytes)
+		assert.NotEqualValues(t, 0x54534f50, firstBytes)
+		assert.NotEqualValues(t, 0x20544547, firstBytes)
+		assert.NotEqualValues(t, 0x4954504f, firstBytes)
+		assert.NotEqualValues(t, 0x02010316, firstBytes)
+		assert.NotEqualValues(t, 0xeeeeeeee, firstBytes)
+		assert.NotEqualValues(t, 0xdddddddd, firstBytes)
+
+		assert.NotEqualValues(
+			t,
+			0,
+			frame.data[4]|frame.data[5]|frame.data[6]|frame.data[7])
+
+		assert.Equal(t, hfConnectionType[:], frame.connectionType())
+		assert.EqualValues(t, arg, frame.dc())
+	})
+}