增加防探测功能,增加流量加密功能

shadow/aes_util.go

@@ -0,0 +1,36 @@
+package shadow
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+)
+
+func AesEncryptCBC(origData []byte, key []byte) []byte {
+	block, _ := aes.NewCipher(key)
+	blockSize := block.BlockSize()
+	origData = pkcs5Padding(origData, blockSize)
+	blockMode := cipher.NewCBCEncrypter(block, key[:blockSize])
+	encrypted := make([]byte, len(origData))
+	blockMode.CryptBlocks(encrypted, origData)
+	return encrypted
+}
+func AesDecryptCBC(encrypted []byte, key []byte) []byte {
+	block, _ := aes.NewCipher(key)
+	blockSize := block.BlockSize()
+	blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
+	decrypted := make([]byte, len(encrypted))
+	blockMode.CryptBlocks(decrypted, encrypted)
+	decrypted = pkcs5UnPadding(decrypted)
+	return decrypted
+}
+func pkcs5Padding(ciphertext []byte, blockSize int) []byte {
+	padding := blockSize - len(ciphertext)%blockSize
+	padtext := bytes.Repeat([]byte{byte(padding)}, padding)
+	return append(ciphertext, padtext...)
+}
+func pkcs5UnPadding(origData []byte) []byte {
+	length := len(origData)
+	unpadding := int(origData[length-1])
+	return origData[:(length - unpadding)]
+}