aes.py 文件源码

def __getDecryptionKey(self, privKey, snmpEngineBoots,
                           snmpEngineTime, salt):
        snmpEngineBoots, snmpEngineTime, salt = (
            int(snmpEngineBoots), int(snmpEngineTime), salt
        )

        iv = [snmpEngineBoots >> 24 & 0xff,
              snmpEngineBoots >> 16 & 0xff,
              snmpEngineBoots >> 8 & 0xff,
              snmpEngineBoots & 0xff,
              snmpEngineTime >> 24 & 0xff,
              snmpEngineTime >> 16 & 0xff,
              snmpEngineTime >> 8 & 0xff,
              snmpEngineTime & 0xff] + salt

        return privKey[:self.keySize].asOctets(), univ.OctetString(iv).asOctets()