解密问题(Python)

我试图用python创建一个洋葱路由器,在这里每个消息在被发送到3个节点进行解密之前将被加密三次。

在下面我设置的测试中,我加密了我的消息三次,但是在解密之后,我只剩下垃圾。我想这可能与我对字节应用填充或编码/解码的顺序有关。

 simpleMessage = "Hello!!!!!"
    CMD1 = "MSG"
    CMD2 = "FWD"
    CMD3 = "FWD"

    messagePackage = (CMD1, simpleMessage)
    messagePackage = str(messagePackage).encode('utf-8')
    messagePackage = self.padder(messagePackage)
    onionLayer1 = encryption.symmetricEncryption(key1[0], key1[1], messagePackage)

    messagePackage2 = (CMD2, onionLayer1)
    messagePackage2 = str(messagePackage2).encode('utf-8')
    messagePackage2 = self.padder(messagePackage2)

    onionLayer2 = encryption.symmetricEncryption(key2[0], key2[1], messagePackage2)

    messagePackage3 = (CMD3, onionLayer2)
    messagePackage3 = str(messagePackage3).encode('utf-8')
    messagePackage3 = self.padder(messagePackage3)

    onionLayer3 = encryption.symmetricEncryption(key3[0], key3[1], messagePackage3)

    onionLayerPeeled3 = encryption.symmetricDecrypt(key3[0], key3[1], onionLayer3)
    onionLayerPeeled2 = encryption.symmetricDecrypt(key2[0], key2[1], onionLayerPeeled3)
    onionLayerPeeled1 = encryption.symmetricDecrypt(key1[0], key1[1], onionLayerPeeled2)

我相信问题是我将每个洋葱层编码成一个字节数组,每次解密后都需要解码回utf-8字符串来读取信息。

但是在解密之间实现以下代码行

OnionOnlayerPeeLed3=OnInLayerPeeLed3.decode('utf-8')

导致以下错误

UnicodeDecodeError:“utf-8”编解码器无法解码位置0中的字节0x99:起始字节无效