add some routes

utils/crypto.go

@@ -0,0 +1,81 @@
+package utils
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"fmt"
+	"os"
+)
+
+var keys = map[string]string{
+	"TW": "mikumikulukaluka",
+	"JP": "mikumikulukaluka",
+	"GL": "RXzFAC87WR28eNcP",
+	"CN": "wakakabiliwakaka",
+}
+
+var ivs = map[string]string{
+	"TW": "lukalukamikumiku",
+	"JP": "lukalukamikumiku",
+	"GL": "hrk0k7knXlit3S_y",
+	"CN": "biliwakakawohaha",
+}
+
+func getKeyIV() ([]byte, []byte, error) {
+	server := os.Getenv("SERVER")
+	key, ok := keys[server]
+	if !ok {
+		return nil, nil, fmt.Errorf("unknown server: %s", server)
+	}
+	return []byte(key), []byte(ivs[server]), nil
+}
+
+func Decrypt(buf []byte) ([]byte, error) {
+	key, iv, err := getKeyIV()
+	if err != nil {
+		return nil, err
+	}
+
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(buf)%aes.BlockSize != 0 {
+		return nil, fmt.Errorf("invalid block size")
+	}
+
+	decrypted := make([]byte, len(buf))
+	cipher.NewCBCDecrypter(block, iv).CryptBlocks(decrypted, buf)
+
+	// 手動移除 padding（setAutoPadding(false) 對應）
+	padLen := int(decrypted[len(decrypted)-1])
+	if padLen > 0 && padLen <= 16 && padLen <= len(decrypted) {
+		decrypted = decrypted[:len(decrypted)-padLen]
+	}
+
+	return decrypted, nil
+}
+
+func Encrypt(buf []byte) ([]byte, error) {
+	key, iv, err := getKeyIV()
+	if err != nil {
+		return nil, err
+	}
+
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	// 手動加 PKCS7 padding（setAutoPadding(true) 對應）
+	blockSize := block.BlockSize()
+	padding := blockSize - len(buf)%blockSize
+	padded := append(buf, bytes.Repeat([]byte{byte(padding)}, padding)...)
+
+	encrypted := make([]byte, len(padded))
+	cipher.NewCBCEncrypter(block, iv).CryptBlocks(encrypted, padded)
+
+	return encrypted, nil
+}