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- def md5_decrypt(data, key):
- reader = StringIO.StringIO(data)
- output = ''
- last_hash = ''
- while 1:
- cur_block = ''
- for i in range(16):
- cur_hash = reader.read(16)
- if len(cur_hash) != 16:
- return output
- cur_block += cur_hash
- cur_byte = '\x00'
- for i in range(0x100):
- md5_ctx = hashlib.md5()
- cur_byte = chr(i)
- md5_ctx.update(cur_byte)
- md5_ctx.update(key)
- md5_ctx.update(last_hash)
- if cur_hash == md5_ctx.digest():
- break
- output += cur_byte
- last_hash = cur_hash
- md5_ctx = hashlib.md5()
- md5_ctx.update(cur_block)
- last_hash = reader.read(16)
- if last_hash != md5_ctx.digest():
- raise Exception("Hash mismatch! Incorrect key or corrupt data")
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