mirror of
https://github.com/Py-KMS-Organization/py-kms.git
synced 2024-09-19 07:18:51 -04:00
117 lines
3.5 KiB
Python
117 lines
3.5 KiB
Python
import binascii
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import struct
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import time
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from kmsBase import kmsBase
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from structure import Structure
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from aes import AES
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import logging
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# v4 AES Key
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key = bytearray([0x05, 0x3D, 0x83, 0x07, 0xF9, 0xE5, 0xF0, 0x88, 0xEB, 0x5E, 0xA6, 0x68, 0x6C, 0xF0, 0x37, 0xC7, 0xE4, 0xEF, 0xD2, 0xD6])
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# Xor Buffer
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def xorBuffer(source, offset, destination, size):
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for i in range(0, size):
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destination[i] ^= source[i + offset]
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class kmsRequestV4(kmsBase):
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class RequestV4(Structure):
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commonHdr = ()
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structure = (
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('bodyLength1', '<I'),
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('bodyLength2', '<I'),
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('request', ':', kmsBase.kmsRequestStruct),
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('hash', '16s'),
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('padding', ':'),
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)
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class ResponseV4(Structure):
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commonHdr = ()
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structure = (
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('bodyLength1', '<I=len(response) + len(hash)'),
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('unknown', '!I=0x00000200'),
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('bodyLength2', '<I=len(response) + len(hash)'),
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('response', ':', kmsBase.kmsResponseStruct),
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('hash', '16s'),
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('padding', ':'),
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)
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def executeRequestLogic(self):
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requestData = self.RequestV4(self.data)
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response = self.serverLogic(requestData['request'])
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hash = self.generateHash(bytearray(str(response)))
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self.responseData = self.generateResponse(response, hash)
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time.sleep(1) # request sent back too quick for Windows 2008 R2, slow it down.
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def generateHash(self, message):
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"""
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The KMS v4 hash is a variant of CMAC-AES-128. There are two key differences:
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* The 'AES' used is modified in particular ways:
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* The basic algorithm is Rjindael with a conceptual 160bit key and 128bit blocks.
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This isn't part of the AES standard, but it works the way you'd expect.
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Accordingly, the algorithm uses 11 rounds and a 192 byte expanded key.
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* The trailing block is not XORed with a generated subkey, as defined in CMAC.
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This is probably because the subkey generation algorithm is only defined for
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situations where block and key size are the same.
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"""
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aes = AES()
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messageSize = len(message)
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lastBlock = bytearray(16)
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hashBuffer = bytearray(16)
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# MessageSize / Blocksize
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j = messageSize >> 4
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# Remainding bytes
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k = messageSize & 0xf
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# Hash
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for i in range(0, j):
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xorBuffer(message, i << 4, hashBuffer, 16)
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hashBuffer = bytearray(aes.encrypt(hashBuffer, key, len(key)))
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# Bit Padding
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ii = 0
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for i in range(j << 4, k + (j << 4)):
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lastBlock[ii] = message[i]
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ii += 1
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lastBlock[k] = 0x80
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xorBuffer(lastBlock, 0, hashBuffer, 16)
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hashBuffer = bytearray(aes.encrypt(hashBuffer, key, len(key)))
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return str(hashBuffer)
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def generateResponse(self, responseBuffer, hash):
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bodyLength = len(responseBuffer) + len(hash)
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response = self.ResponseV4()
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response['response'] = responseBuffer
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response['hash'] = hash
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response['padding'] = self.getResponsePadding(bodyLength)
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logging.debug("KMS V4 Response: %s" % response.dump())
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logging.debug("KMS V4 Response Bytes: %s" % binascii.b2a_hex(str(response)))
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return str(response)
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def getResponse(self):
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return self.responseData
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def generateRequest(self, requestBase):
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hash = str(self.generateHash(bytearray(str(requestBase))))
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bodyLength = len(requestBase) + len(hash)
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request = kmsRequestV4.RequestV4()
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request['bodyLength1'] = bodyLength
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request['bodyLength2'] = bodyLength
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request['request'] = requestBase
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request['hash'] = hash
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request['padding'] = self.getResponsePadding(bodyLength)
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logging.debug("Request V4 Data: %s" % request.dump())
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logging.debug("Request V4: %s" % binascii.b2a_hex(str(request)))
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return request
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