gssapi.py 文件源码

def GSS_GetMIC(self, sessionKey, data, sequenceNumber, direction = 'init'):
        GSS_GETMIC_HEADER = '\x60\x23\x06\x09\x2a\x86\x48\x86\xf7\x12\x01\x02\x02'
        token = self.MIC()

        # Let's pad the data
        pad = (4 - (len(data) % 4)) & 0x3
        padStr = chr(pad) * pad
        data += padStr

        token['SGN_ALG'] = GSS_HMAC
        if direction == 'init':
            token['SND_SEQ'] = struct.pack('>L', sequenceNumber) + '\x00'*4
        else:
            token['SND_SEQ'] = struct.pack('>L', sequenceNumber) + '\xff'*4

        Ksign = HMAC.new(sessionKey.contents, 'signaturekey\0', MD5).digest()
        Sgn_Cksum = MD5.new( struct.pack('<L',15) + str(token)[:8] + data).digest()
        Sgn_Cksum = HMAC.new(Ksign, Sgn_Cksum, MD5).digest()
        token['SGN_CKSUM'] = Sgn_Cksum[:8]

        Kseq = HMAC.new(sessionKey.contents, struct.pack('<L',0), MD5).digest()
        Kseq = HMAC.new(Kseq, token['SGN_CKSUM'], MD5).digest()
        token['SND_SEQ'] = ARC4.new(Kseq).encrypt(token['SND_SEQ'])
        finalData = GSS_GETMIC_HEADER + token.getData()
        return finalData