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#!/usr/bin/env python3
# Copyright (c) 2016-2020 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Encode and decode Bitcoin addresses.
- base58 P2PKH and P2SH addresses.
- bech32 segwit v0 P2WPKH and P2WSH addresses."""
import enum
import unittest
from .script import hash256, hash160, sha256, CScript, OP_0
from .segwit_addr import encode_segwit_address
from .util import assert_equal
ADDRESS_BCRT1_UNSPENDABLE = 'bcrt1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq3xueyj'
ADDRESS_BCRT1_UNSPENDABLE_DESCRIPTOR = 'addr(bcrt1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq3xueyj)#juyq9d97'
# Coins sent to this address can be spent with a witness stack of just OP_TRUE
ADDRESS_BCRT1_P2WSH_OP_TRUE = 'bcrt1qft5p2uhsdcdc3l2ua4ap5qqfg4pjaqlp250x7us7a8qqhrxrxfsqseac85'
class AddressType(enum.Enum):
bech32 = 'bech32'
p2sh_segwit = 'p2sh-segwit'
legacy = 'legacy' # P2PKH
chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
def byte_to_base58(b, version):
result = ''
str = b.hex()
str = chr(version).encode('latin-1').hex() + str
checksum = hash256(bytes.fromhex(str)).hex()
str += checksum[:8]
value = int('0x' + str, 0)
while value > 0:
result = chars[value % 58] + result
value //= 58
while (str[:2] == '00'):
result = chars[0] + result
str = str[2:]
return result
def base58_to_byte(s):
"""Converts a base58-encoded string to its data and version.
Throws if the base58 checksum is invalid."""
if not s:
return b''
n = 0
for c in s:
n *= 58
assert c in chars
digit = chars.index(c)
n += digit
h = '%x' % n
if len(h) % 2:
h = '0' + h
res = n.to_bytes((n.bit_length() + 7) // 8, 'big')
pad = 0
for c in s:
if c == chars[0]:
pad += 1
else:
break
res = b'\x00' * pad + res
# Assert if the checksum is invalid
assert_equal(hash256(res[:-4])[:4], res[-4:])
return res[1:-4], int(res[0])
def keyhash_to_p2pkh(hash, main=False):
assert len(hash) == 20
version = 0 if main else 111
return byte_to_base58(hash, version)
def scripthash_to_p2sh(hash, main=False):
assert len(hash) == 20
version = 5 if main else 196
return byte_to_base58(hash, version)
def key_to_p2pkh(key, main=False):
key = check_key(key)
return keyhash_to_p2pkh(hash160(key), main)
def script_to_p2sh(script, main=False):
script = check_script(script)
return scripthash_to_p2sh(hash160(script), main)
def key_to_p2sh_p2wpkh(key, main=False):
key = check_key(key)
p2shscript = CScript([OP_0, hash160(key)])
return script_to_p2sh(p2shscript, main)
def program_to_witness(version, program, main=False):
if (type(program) is str):
program = bytes.fromhex(program)
assert 0 <= version <= 16
assert 2 <= len(program) <= 40
assert version > 0 or len(program) in [20, 32]
return encode_segwit_address("bc" if main else "bcrt", version, program)
def script_to_p2wsh(script, main=False):
script = check_script(script)
return program_to_witness(0, sha256(script), main)
def key_to_p2wpkh(key, main=False):
key = check_key(key)
return program_to_witness(0, hash160(key), main)
def script_to_p2sh_p2wsh(script, main=False):
script = check_script(script)
p2shscript = CScript([OP_0, sha256(script)])
return script_to_p2sh(p2shscript, main)
def check_key(key):
if (type(key) is str):
key = bytes.fromhex(key) # Assuming this is hex string
if (type(key) is bytes and (len(key) == 33 or len(key) == 65)):
return key
assert False
def check_script(script):
if (type(script) is str):
script = bytes.fromhex(script) # Assuming this is hex string
if (type(script) is bytes or type(script) is CScript):
return script
assert False
class TestFrameworkScript(unittest.TestCase):
def test_base58encodedecode(self):
def check_base58(data, version):
self.assertEqual(base58_to_byte(byte_to_base58(data, version)), (data, version))
check_base58(bytes.fromhex('1f8ea1702a7bd4941bca0941b852c4bbfedb2e05'), 111)
check_base58(bytes.fromhex('3a0b05f4d7f66c3ba7009f453530296c845cc9cf'), 111)
check_base58(bytes.fromhex('41c1eaf111802559bad61b60d62b1f897c63928a'), 111)
check_base58(bytes.fromhex('0041c1eaf111802559bad61b60d62b1f897c63928a'), 111)
check_base58(bytes.fromhex('000041c1eaf111802559bad61b60d62b1f897c63928a'), 111)
check_base58(bytes.fromhex('00000041c1eaf111802559bad61b60d62b1f897c63928a'), 111)
check_base58(bytes.fromhex('1f8ea1702a7bd4941bca0941b852c4bbfedb2e05'), 0)
check_base58(bytes.fromhex('3a0b05f4d7f66c3ba7009f453530296c845cc9cf'), 0)
check_base58(bytes.fromhex('41c1eaf111802559bad61b60d62b1f897c63928a'), 0)
check_base58(bytes.fromhex('0041c1eaf111802559bad61b60d62b1f897c63928a'), 0)
check_base58(bytes.fromhex('000041c1eaf111802559bad61b60d62b1f897c63928a'), 0)
check_base58(bytes.fromhex('00000041c1eaf111802559bad61b60d62b1f897c63928a'), 0)
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