SecurePacket.py 文件源码

def __init__(self, iKICD):
        """ Constructor for KIC/KID object.
 iKICD - coding of KIC or KID (see ETSI 102.225, 5.1.2 and 5.1.3, u8)"""
        iKICD %= 0x100
        self.iKICD = iKICD
        self.keyval = None
        if iKICD & KICD.ALGO == KICD.ALGO_DES:           # DES/3DES key
            b43 = iKICD & 0x0C           # bits 4 and 3 of KIC/KID
            self.keysize = 8 + 2*(b43 % 12)  # mapping to DES, 3DES 2k, 3DES 3k
            self.cipModule = b43 % 12 and DES3 or DES
            self.MODE = b43 == KICD.DES_ECB and DES.MODE_EBC or DES.MODE_CBC
            self.BS = 8
            self.zAES = False
        elif iKICD & 0x0F == KICD.ALGO_AES:         # AES CBC / CMAC
            self.zAES = True
            self.cipModule = AES
            self.MODE = AES.MODE_CBC
            self.BS = 16
            self.TlenB = 8     # length of CMAC, you may manually change to 4
            self.irrPoly = 0x87            # for CMAC
        else:
            raise ValueError("Only DES/AES implemented for KIC/KID")