des.py 文件源码

def encryptData(self, encryptKey, privParameters, dataToEncrypt):
        if DES is None:
            raise error.StatusInformation(
                errorIndication=errind.encryptionError
            )

        snmpEngineBoots, snmpEngineTime, salt = privParameters

        # 8.3.1.1
        desKey, salt, iv = self.__getEncryptionKey(
            encryptKey, snmpEngineBoots
        )

        # 8.3.1.2
        privParameters = univ.OctetString(salt)

        # 8.1.1.2
        desObj = DES.new(desKey, DES.MODE_CBC, iv)
        plaintext = dataToEncrypt + univ.OctetString((0,) * (8 - len(dataToEncrypt) % 8)).asOctets()
        ciphertext = desObj.encrypt(plaintext)

        # 8.3.1.3 & 4
        return univ.OctetString(ciphertext), privParameters

    # 8.2.4.2