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function PKCS7UnPadding 改為：

func PKCS7UnPadding(plainTextWithPadding []byte) (plainTextWithoutPadding []byte, err error) {
	defer func() {
		if err := recover(); err != nil {
			plainTextWithoutPadding = nil
			err = fmt.Errorf("%+v", err)
		}
	}()

	length := len(plainTextWithPadding)
	unpadding := int(plainTextWithPadding[length-1])

	// Return plaintext without padding.
	plainTextWithoutPadding = plainTextWithPadding[:(length - unpadding)]
	return plainTextWithoutPadding, nil
}

function AesDecrypt 改為：

func AesDecrypt(cipherText, key []byte) ([]byte, error) {
	// Hexadecimal to byte.
	cipherText, err := hex.DecodeString(string(cipherText))
	if err != nil {
		return nil, err
	}

	block, err := aes.NewCipher(key)
	if err != nil {
		return nil, err
	}

	blockSize := block.BlockSize()
	blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
	plainTextWithPadding := make([]byte, len(cipherText))
	blockMode.CryptBlocks(plainTextWithPadding, cipherText)
	plainText, err := PKCS7UnPadding(plainTextWithPadding)

	return plainText, err
}