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mirror of https://github.com/trezor/trezor-firmware.git synced 2024-12-24 15:28:10 +00:00
trezor-firmware/trezorlib/tools.py
2016-05-20 19:18:33 +02:00

103 lines
3.0 KiB
Python

import hashlib
import binascii
import sys
Hash = lambda x: hashlib.sha256(hashlib.sha256(x).digest()).digest()
def hash_160(public_key):
md = hashlib.new('ripemd160')
md.update(hashlib.sha256(public_key).digest())
return md.digest()
def hash_160_to_bc_address(h160, address_type):
vh160 = chr(address_type) + h160
h = Hash(vh160)
addr = vh160 + h[0:4]
return b58encode(addr)
def compress_pubkey(public_key):
if public_key[0] == '\x04':
return chr((ord(public_key[64]) & 1) + 2) + public_key[1:33]
raise Exception("Pubkey is already compressed")
def public_key_to_bc_address(public_key, address_type, compress=True):
if public_key[0] == '\x04' and compress:
public_key = compress_pubkey(public_key)
h160 = hash_160(public_key)
return hash_160_to_bc_address(h160, address_type)
__b58chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
__b58base = len(__b58chars)
def b58encode(v):
""" encode v, which is a string of bytes, to base58."""
long_value = 0
for (i, c) in enumerate(v[::-1]):
long_value += (256 ** i) * ord(c)
result = ''
while long_value >= __b58base:
div, mod = divmod(long_value, __b58base)
result = __b58chars[mod] + result
long_value = div
result = __b58chars[long_value] + result
# Bitcoin does a little leading-zero-compression:
# leading 0-bytes in the input become leading-1s
nPad = 0
for c in v:
if c == '\0':
nPad += 1
else:
break
return (__b58chars[0] * nPad) + result
def b58decode(v, length):
""" decode v into a string of len bytes."""
long_value = 0
for (i, c) in enumerate(v[::-1]):
long_value += __b58chars.find(c) * (__b58base ** i)
result = ''
while long_value >= 256:
div, mod = divmod(long_value, 256)
result = chr(mod) + result
long_value = div
result = chr(long_value) + result
nPad = 0
for c in v:
if c == __b58chars[0]:
nPad += 1
else:
break
result = chr(0) * nPad + result
if length is not None and len(result) != length:
return None
if sys.version_info[0] < 3:
return result
else:
return str.encode(result)
def monkeypatch_google_protobuf_text_format():
# monkeypatching: text formatting of protobuf messages
import google.protobuf.text_format
import google.protobuf.descriptor
_oldPrintFieldValue = google.protobuf.text_format.PrintFieldValue
def _customPrintFieldValue(field, value, out, indent=0, as_utf8=False, as_one_line=False, pointy_brackets=False, float_format=None):
if field.type == google.protobuf.descriptor.FieldDescriptor.TYPE_BYTES:
_oldPrintFieldValue(field, 'hex(%s)' % binascii.hexlify(value), out, indent, as_utf8, as_one_line)
else:
_oldPrintFieldValue(field, value, out, indent, as_utf8, as_one_line)
google.protobuf.text_format.PrintFieldValue = _customPrintFieldValue