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#!/usr/bin/env python3
# Copyright (c) 2016-2017 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 BASE58, P2PKH and P2SH addresses."""
from .script import hash256, hash160, sha256, CScript, OP_0
from .util import bytes_to_hex_str, hex_str_to_bytes
from . import segwit_addr
chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
def byte_to_base58(b, version):
result = ''
str = bytes_to_hex_str(b)
str = bytes_to_hex_str(chr(version).encode('latin-1')) + str
checksum = bytes_to_hex_str(hash256(hex_str_to_bytes(str)))
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
# TODO: def base58_decode
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 = hex_str_to_bytes(program)
assert 0 <= version <= 16
assert 2 <= len(program) <= 40
assert version > 0 or len(program) in [20, 32]
return segwit_addr.encode("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 = hex_str_to_bytes(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 = hex_str_to_bytes(script) # Assuming this is hex string
if (type(script) is bytes or type(script) is CScript):
return script
assert(False)
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