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67 lines
1.8 KiB
67 lines
1.8 KiB
# Copyright 2012 Kjell Braden <afflux@pentabarf.de>
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#
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# This file is part of the python-potr library.
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#
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# python-potr is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# any later version.
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#
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# python-potr is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this library. If not, see <http://www.gnu.org/licenses/>.
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# some python3 compatibilty
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from __future__ import unicode_literals
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import struct
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def pack_mpi(n):
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return pack_data(long_to_bytes(n))
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def read_mpi(data):
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n, data = read_data(data)
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return bytes_to_long(n), data
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def pack_data(data):
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return struct.pack(b'!I', len(data)) + data
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def read_data(data):
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datalen, data = unpack(b'!I', data)
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return data[:datalen], data[datalen:]
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def unpack(fmt, buf):
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s = struct.Struct(fmt)
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return s.unpack(buf[:s.size]) + (buf[s.size:],)
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def bytes_to_long(b):
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l = len(b)
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s = 0
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for i in range(l):
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s += byte_to_long(b[i:i+1]) << 8*(l-i-1)
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return s
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def long_to_bytes(l, n=0):
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b = b''
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while l != 0 or n > 0:
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b = long_to_byte(l & 0xff) + b
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l >>= 8
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n -= 1
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return b
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def byte_to_long(b):
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return struct.unpack(b'B', b)[0]
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def long_to_byte(l):
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return struct.pack(b'B', l)
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def human_hash(fp):
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fp = fp.upper()
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fplen = len(fp)
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wordsize = fplen//5
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buf = ''
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for w in range(0, fplen, wordsize):
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buf += '{0} '.format(fp[w:w+wordsize])
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return buf.rstrip()
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