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()