112 lines
3.1 KiB
Python
112 lines
3.1 KiB
Python
# This file is part of the TREZOR project.
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#
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# Copyright (C) 2012-2016 Marek Palatinus <slush@satoshilabs.com>
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# Copyright (C) 2012-2016 Pavol Rusnak <stick@satoshilabs.com>
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# Copyright (C) 2016 Jochen Hoenicke <hoenicke@gmail.com>
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#
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# This library 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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# (at your option) any later version.
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#
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# This library 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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import hashlib
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import binascii
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import struct
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import sys
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def Hash(data):
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return hashlib.sha256(hashlib.sha256(data).digest()).digest()
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def hash_160(public_key):
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md = hashlib.new('ripemd160')
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md.update(hashlib.sha256(public_key).digest())
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return md.digest()
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def hash_160_to_bc_address(h160, address_type):
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vh160 = struct.pack('<B', address_type) + h160
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h = Hash(vh160)
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addr = vh160 + h[0:4]
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return b58encode(addr)
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def compress_pubkey(public_key):
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if public_key[0] == 4:
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return bytes((public_key[64] & 1) + 2) + public_key[1:33]
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raise ValueError("Pubkey is already compressed")
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def public_key_to_bc_address(public_key, address_type, compress=True):
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if public_key[0] == '\x04' and compress:
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public_key = compress_pubkey(public_key)
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h160 = hash_160(public_key)
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return hash_160_to_bc_address(h160, address_type)
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__b58chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
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__b58base = len(__b58chars)
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def b58encode(v):
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""" encode v, which is a string of bytes, to base58."""
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long_value = 0
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for c in v:
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long_value = long_value * 256 + c
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result = ''
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while long_value >= __b58base:
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div, mod = divmod(long_value, __b58base)
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result = __b58chars[mod] + result
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long_value = div
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result = __b58chars[long_value] + result
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# Bitcoin does a little leading-zero-compression:
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# leading 0-bytes in the input become leading-1s
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nPad = 0
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for c in v:
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if c == 0:
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nPad += 1
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else:
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break
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return (__b58chars[0] * nPad) + result
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def b58decode(v, length):
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""" decode v into a string of len bytes."""
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long_value = 0
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for (i, c) in enumerate(v[::-1]):
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long_value += __b58chars.find(c) * (__b58base ** i)
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result = b''
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while long_value >= 256:
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div, mod = divmod(long_value, 256)
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result = struct.pack('B', mod) + result
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long_value = div
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result = struct.pack('B', long_value) + result
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nPad = 0
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for c in v:
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if c == __b58chars[0]:
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nPad += 1
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else:
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break
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result = b'\x00' * nPad + result
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if length is not None and len(result) != length:
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return None
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return result
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