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58 lines
2.5 KiB
Python
Executable File
58 lines
2.5 KiB
Python
Executable File
import utils
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from utils import BinaryWriter
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class RSAServerKey:
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def __init__(self, fingerprint, m, e):
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self.fingerprint = fingerprint
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self.m = m
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self.e = e
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def encrypt(self, data, offset=None, length=None):
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"""Encrypts the given data with the current key"""
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if offset is None:
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offset = 0
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if length is None:
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length = len(data)
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with BinaryWriter() as writer:
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# Write SHA
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writer.write(utils.sha1(data[offset:offset+length]))
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# Write data
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writer.write(data[offset:offset+length])
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# Add padding if required
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if length < 235:
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writer.write(utils.generate_random_bytes(235 - length))
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result = int.from_bytes(writer.get_bytes(), byteorder='big')
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result = pow(result, self.e, self.m)
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# If the result byte count is less than 256, since the byte order is big,
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# the non-used bytes on the left will be 0 and act as padding,
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# without need of any additional checks
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return int.to_bytes(result, length=256, byteorder='big', signed=False)
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class RSA:
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_server_keys = {
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'216be86c022bb4c3':
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RSAServerKey('216be86c022bb4c3', int('C150023E2F70DB7985DED064759CFECF0AF328E69A41DAF4D6F01B538135A6F9'
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'1F8F8B2A0EC9BA9720CE352EFCF6C5680FFC424BD634864902DE0B4BD6D49F4E'
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'580230E3AE97D95C8B19442B3C0A10D8F5633FECEDD6926A7F6DAB0DDB7D457F'
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'9EA81B8465FCD6FFFEED114011DF91C059CAEDAF97625F6C96ECC74725556934'
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'EF781D866B34F011FCE4D835A090196E9A5F0E4449AF7EB697DDB9076494CA5F'
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'81104A305B6DD27665722C46B60E5DF680FB16B210607EF217652E60236C255F'
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'6A28315F4083A96791D7214BF64C1DF4FD0DB1944FB26A2A57031B32EEE64AD1'
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'5A8BA68885CDE74A5BFC920F6ABF59BA5C75506373E7130F9042DA922179251F',
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16), int('010001', 16))
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}
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@staticmethod
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def encrypt(fingerprint, data, offset=None, length=None):
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"""Encrypts the given data given a fingerprint"""
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if fingerprint.lower() not in RSA._server_keys:
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return None
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key = RSA._server_keys[fingerprint.lower()]
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return key.encrypt(data, offset, length)
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