feat(go): Port full Ananta private server to Go architecture

pkg/crypto/chacha8/chacha8_test.go

@@ -0,0 +1,41 @@
+package chacha8
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestChaCha8Roundtrip(t *testing.T) {
+	key := make([]byte, 32)
+	for i := range key {
+		key[i] = byte(i + 1)
+	}
+	nonce := make([]byte, 12)
+	for i := range nonce {
+		nonce[i] = byte(i + 0x10)
+	}
+
+	c1, err := New(key, nonce)
+	if err != nil {
+		t.Fatalf("New failed: %v", err)
+	}
+
+	c2, err := New(key, nonce)
+	if err != nil {
+		t.Fatalf("New failed: %v", err)
+	}
+
+	original := []byte("Hello, Ananta NetEase UXChaCha8 stream cipher verification!")
+	data := make([]byte, len(original))
+	copy(data, original)
+
+	c1.XorInPlace(data)
+	if bytes.Equal(data, original) {
+		t.Errorf("Ciphertext equals plaintext")
+	}
+
+	c2.XorInPlace(data)
+	if !bytes.Equal(data, original) {
+		t.Errorf("Decrypted data != original: got %q, want %q", data, original)
+	}
+}