1 # Copyright 2011-2012 GRNET S.A. All rights reserved.
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4 # without modification, are permitted provided that the following
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36 from binascii import hexlify
39 def file_read_iterator(fp, size=1024):
48 def __init__(self, blocksize, blockhash):
49 super(HashMap, self).__init__()
50 self.blocksize = blocksize
51 self.blockhash = blockhash
53 def _hash_raw(self, v):
54 h = hashlib.new(self.blockhash)
58 def _hash_block(self, v):
59 return self._hash_raw(v.rstrip('\x00'))
63 return self._hash_raw('')
65 return self.__getitem__(0)
71 h += [('\x00' * len(h[0]))] * (s - len(h))
73 h = [self._hash_raw(h[x] + h[x + 1]) for x in range(0, len(h), 2)]
78 for block in file_read_iterator(fp, self.blocksize):
79 self.append(self._hash_block(block))
80 self.size += len(block)
83 def merkle(path, blocksize=4194304, blockhash='sha256'):
84 hashes = HashMap(blocksize, blockhash)
85 hashes.load(open(path))
86 return hexlify(hashes.hash())