427 lines
14 KiB
Python
427 lines
14 KiB
Python
# (c) Copyright 2018 by Coinkite Inc. This file is covered by license found in COPYING-CC.
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#
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# chains.py - Magic values for the coins and altcoins we support
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#
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import ngu
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from uhashlib import sha256
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from ubinascii import hexlify as b2a_hex
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from public_constants import AF_CLASSIC, AF_P2WPKH, AF_P2TR
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from public_constants import AF_P2SH, AF_P2WSH, AF_P2WPKH_P2SH, AF_P2WSH_P2SH
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from public_constants import AFC_PUBKEY, AFC_SEGWIT, AFC_BECH32, AFC_SCRIPT
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from serializations import hash160, ser_compact_size, disassemble
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from ucollections import namedtuple
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from opcodes import OP_RETURN, OP_1, OP_16
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# See SLIP 132 <https://github.com/satoshilabs/slips/blob/master/slip-0132.md>
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# for background on these version bytes. Not to be confused with SLIP-32 which involves Bech32.
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Slip132Version = namedtuple('Slip132Version', ('pub', 'priv', 'hint'))
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# See also:
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# - <https://github.com/satoshilabs/slips/blob/master/slip-0132.md>
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# - defines ypub/zpub/Xprc variants
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# - <https://github.com/satoshilabs/slips/blob/master/slip-0032.md>
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# - nice bech32 encoded scheme for going forward
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# - <https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2017-September/014907.html>
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# - mailing list post proposed ypub, etc.
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# - from <https://github.com/Bit-Wasp/bitcoin-php/issues/576>
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# - also electrum source: electrum/lib/constants.py
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class ChainsBase:
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curve = 'secp256k1'
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menu_name = None # use 'name' if this isn't defined
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core_name = None # name of chain's "core" p2p software
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# b44_cointype comes from
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# <https://github.com/satoshilabs/slips/blob/master/slip-0044.md>
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# but without high bit set
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@classmethod
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def msg_signing_prefix(cls):
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# see strMessageMagic ... but usually just the coin's name
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# prefixed w/ a length byte
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return '\x18Bitcoin Signed Message:\n'
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@classmethod
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def sig_hdr_base(cls, addr_fmt):
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if addr_fmt == AF_CLASSIC:
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return 31
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elif addr_fmt == AF_P2WPKH_P2SH:
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return 35
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elif addr_fmt == AF_P2WPKH:
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return 39
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else:
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raise ValueError
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@classmethod
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def serialize_private(cls, node, addr_fmt=AF_CLASSIC):
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# output a xprv
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return node.serialize(cls.slip132[addr_fmt].priv, True)
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@classmethod
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def serialize_public(cls, node, addr_fmt=AF_CLASSIC):
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# output a xpub
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addr_fmt = AF_CLASSIC if addr_fmt == AF_P2SH else addr_fmt
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return node.serialize(cls.slip132[addr_fmt].pub, False)
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@classmethod
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def deserialize_node(cls, text, addr_fmt):
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# xpub/xprv to object
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addr_fmt = AF_CLASSIC if addr_fmt == AF_P2SH else addr_fmt
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node = ngu.hdnode.HDNode()
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version = node.deserialize(text)
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assert (version == cls.slip132[addr_fmt].pub) \
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or (version == cls.slip132[addr_fmt].priv)
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return node
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@classmethod
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def p2sh_address(cls, addr_fmt, witdeem_script):
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# Multisig and general P2SH support
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# - witdeem => witness script for segwit, or redeem script otherwise
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# - redeem script can be generated from witness script if needed.
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# - this function needs a witdeem script to be provided, not simple to make
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# - more verification needed to prove it's change/included address (NOT HERE)
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# - reference: <https://bitcoincore.org/en/segwit_wallet_dev/>
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# - returns: str(address)
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assert addr_fmt & AFC_SCRIPT, 'for p2sh only'
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assert witdeem_script, "need witness/redeem script"
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if addr_fmt & AFC_SEGWIT:
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digest = ngu.hash.sha256s(witdeem_script)
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else:
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digest = hash160(witdeem_script)
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if addr_fmt & AFC_BECH32:
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# bech32 encoded segwit p2sh
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addr = ngu.codecs.segwit_encode(cls.bech32_hrp, 0, digest)
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elif addr_fmt == AF_P2WSH_P2SH:
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# segwit p2wsh encoded as classic P2SH
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addr = ngu.codecs.b58_encode(cls.b58_script + hash160(b'\x00\x20' + digest))
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else:
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# P2SH classic
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addr = ngu.codecs.b58_encode(cls.b58_script + digest)
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return addr
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@classmethod
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def pubkey_to_address(cls, pubkey, addr_fmt):
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# - renders a pubkey to an address
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# - works only with single-key addresses
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assert not addr_fmt & AFC_SCRIPT
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keyhash = ngu.hash.hash160(pubkey)
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if addr_fmt == AF_CLASSIC:
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script = b'\x76\xA9\x14' + keyhash + b'\x88\xAC'
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elif addr_fmt == AF_P2WPKH_P2SH:
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redeem_script = b'\x00\x14' + keyhash
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scripthash = ngu.hash.hash160(redeem_script)
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script = b'\xA9\x14' + scripthash + b'\x87'
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elif addr_fmt == AF_P2WPKH:
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script = b'\x00\x14' + keyhash
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else:
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raise ValueError('bad address template: %s' % addr_fmt)
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return cls.render_address(script)
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@classmethod
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def address(cls, node, addr_fmt):
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# return a human-readable, properly formatted address
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if addr_fmt == AF_CLASSIC:
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# olde fashioned P2PKH
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assert len(cls.b58_addr) == 1
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return node.addr_help(cls.b58_addr[0])
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if addr_fmt & AFC_SCRIPT:
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# use p2sh_address() instead.
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raise ValueError(hex(addr_fmt))
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# so must be P2PKH, fetch it.
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assert addr_fmt & AFC_PUBKEY
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raw = node.addr_help()
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assert len(raw) == 20
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if addr_fmt & AFC_BECH32:
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# bech32 encoded segwit p2pkh
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return ngu.codecs.segwit_encode(cls.bech32_hrp, 0, raw)
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# see BIP-141, "P2WPKH nested in BIP16 P2SH" section
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assert addr_fmt == AF_P2WPKH_P2SH
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assert len(cls.b58_script) == 1
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digest = hash160(b'\x00\x14' + raw)
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return ngu.codecs.b58_encode(cls.b58_script + digest)
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@classmethod
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def privkey(cls, node):
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# serialize a private key (generally shouldn't be!)
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return node.serialize(cls.b58_privkey, True)
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@classmethod
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def hash_message(cls, msg=None, msg_len=0):
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# Perform sha256 for message-signing purposes (only)
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# - or get setup for that, if msg == None
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s = sha256()
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s.update(cls.msg_signing_prefix())
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msg_len = msg_len or len(msg)
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s.update(ser_compact_size(msg_len))
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if msg is None:
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return s
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s.update(msg)
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return ngu.hash.sha256s(s.digest())
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@classmethod
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def render_value(cls, val, unpad=False):
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# convert nValue from a transaction into human form.
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# - always be precise
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# - return (string, units label)
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from glob import settings
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rz = settings.get('rz', 8)
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if rz == 8:
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# full Bitcoins, for OG's
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unit = cls.ctype
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div = 100000000 # caution: don't use 1E8 here, that's a float
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fmt = '%08d'
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elif rz == 5:
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unit = 'm' + cls.ctype # includes mXTN
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div = 100000
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fmt = '%05d'
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elif rz == 2:
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unit = 'bits'
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div = 100
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fmt = '%02d'
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elif rz == 0:
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return str(val), 'sats'
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if unpad:
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# show precise value, but no trailing zeros
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if (val % div):
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txt = (('%d.'+fmt) % (val // div, val % div)).rstrip('0')
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else:
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# round amount, omit decimal point
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txt = '%d' % (val // div)
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else:
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# all the zeros & fixed with result
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txt = ('%d.'+fmt) % (val // div, val % div)
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return txt, unit
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@classmethod
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def render_address(cls, script):
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# take a scriptPubKey (part of the TxOut) and convert into conventional human-readable
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# string... aka: the "payment address"
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ll = len(script)
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# P2PKH
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if ll == 25 and script[0:3] == b'\x76\xA9\x14' and script[23:26] == b'\x88\xAC':
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return ngu.codecs.b58_encode(cls.b58_addr + script[3:3+20])
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# P2SH
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if ll == 23 and script[0:2] == b'\xA9\x14' and script[22] == 0x87:
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return ngu.codecs.b58_encode(cls.b58_script + script[2:2+20])
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# segwit v0 (P2WPKH, P2WSH)
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if script[0] == 0 and script[1] in (0x14, 0x20) and (ll-2) == script[1]:
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return ngu.codecs.segwit_encode(cls.bech32_hrp, script[0], script[2:])
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# segwit v1 (P2TR) and later segwit version
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if ll == 34 and (OP_1 <= script[0] <= OP_16) and script[1] == 0x20:
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return ngu.codecs.segwit_encode(cls.bech32_hrp, script[0] - 80, script[2:])
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raise ValueError('Unknown payment script', repr(script))
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@classmethod
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def op_return(cls, script):
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"""Returns decoded string op return data if script is op return otherwise None"""
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gen = disassemble(script)
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script_type = next(gen)
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if OP_RETURN in script_type:
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data = next(gen)[0]
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data_hex = b2a_hex(data).decode()
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data_ascii = None
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if min(data) >= 32 and max(data) < 127: # printable
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try:
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data_ascii = data.decode("ascii")
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except:
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pass
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return data_hex, data_ascii
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return None
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@classmethod
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def possible_address_fmt(cls, addr):
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# Given a text (serialized) address, return what
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# address format applies to the address, but
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# for AF_P2SH case, could be AF_P2WPKH_P2SH, AF_P2WSH_P2SH.
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if addr.startswith(cls.bech32_hrp):
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if addr.startswith(cls.bech32_hrp+'1p'):
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return AF_P2TR
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else:
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return AF_P2WPKH if len(addr) < 55 else AF_P2WSH
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try:
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raw = ngu.codecs.b58_decode(addr)
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except ValueError:
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# not base58, not an error
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return 0
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if raw[0] == cls.b58_addr[0]:
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return AF_CLASSIC
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if raw[0] == cls.b58_script[0]:
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return AF_P2SH
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return 0
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class BitcoinMain(ChainsBase):
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# see <https://github.com/bitcoin/bitcoin/blob/master/src/chainparams.cpp#L140>
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ctype = 'BTC'
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name = 'Bitcoin'
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core_name = 'Bitcoin Core'
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slip132 = {
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AF_CLASSIC: Slip132Version(0x0488B21E, 0x0488ADE4, 'x'),
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AF_P2WPKH_P2SH: Slip132Version(0x049d7cb2, 0x049d7878, 'y'),
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AF_P2WPKH: Slip132Version(0x04b24746, 0x04b2430c, 'z'),
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AF_P2WSH_P2SH: Slip132Version(0x0295b43f, 0x0295b005, 'Y'),
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AF_P2WSH: Slip132Version(0x02aa7ed3, 0x02aa7a99, 'Z'),
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}
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bech32_hrp = 'bc'
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b58_addr = bytes([0])
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b58_script = bytes([5])
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b58_privkey = bytes([128])
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b44_cointype = 0
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class BitcoinTestnet(BitcoinMain):
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ctype = 'XTN'
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name = 'Bitcoin Testnet'
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menu_name = 'Testnet: BTC'
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slip132 = {
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AF_CLASSIC: Slip132Version(0x043587cf, 0x04358394, 't'),
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AF_P2WPKH_P2SH: Slip132Version(0x044a5262, 0x044a4e28, 'u'),
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AF_P2WPKH: Slip132Version(0x045f1cf6, 0x045f18bc, 'v'),
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AF_P2WSH_P2SH: Slip132Version(0x024289ef, 0x024285b5, 'U'),
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AF_P2WSH: Slip132Version(0x02575483, 0x02575048, 'V'),
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}
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bech32_hrp = 'tb'
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b58_addr = bytes([111])
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b58_script = bytes([196])
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b58_privkey = bytes([239])
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b44_cointype = 1
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class BitcoinRegtest(BitcoinMain):
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ctype = 'XRT'
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name = 'Bitcoin Regtest'
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menu_name = 'Regtest: BTC'
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slip132 = {
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AF_CLASSIC: Slip132Version(0x043587cf, 0x04358394, 't'),
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AF_P2WPKH_P2SH: Slip132Version(0x044a5262, 0x044a4e28, 'u'),
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AF_P2WPKH: Slip132Version(0x045f1cf6, 0x045f18bc, 'v'),
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AF_P2WSH_P2SH: Slip132Version(0x024289ef, 0x024285b5, 'U'),
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AF_P2WSH: Slip132Version(0x02575483, 0x02575048, 'V'),
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}
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bech32_hrp = 'bcrt'
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b58_addr = bytes([111])
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b58_script = bytes([196])
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b58_privkey = bytes([239])
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b44_cointype = 1
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def get_chain(short_name):
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# lookup object from name: 'BTC' or 'XTN'
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if short_name is None:
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return BitcoinMain
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if short_name == 'BTC':
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return BitcoinMain
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elif short_name == 'XTN':
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return BitcoinTestnet
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elif short_name == 'XRT':
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return BitcoinRegtest
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else:
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raise KeyError(short_name)
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def current_chain():
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# return chain matching current setting
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from glob import settings
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chain = settings.get('chain', None)
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if chain is None:
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return BitcoinMain
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return get_chain(chain)
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# Overbuilt: will only be testnet and mainchain.
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AllChains = [BitcoinMain, BitcoinTestnet, BitcoinRegtest]
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def slip32_deserialize(xp):
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# .. and classify chain and addr-type, as implied by prefix
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node = ngu.hdnode.HDNode()
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version = node.deserialize(xp)
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for ch in AllChains:
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for kk in ch.slip132:
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if ch.slip132[kk].pub == version:
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return node, ch, kk, False
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if ch.slip132[kk].priv == version:
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return node, ch, kk, True
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raise ValueError(hex(version))
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# Some common/useful derivation paths and where they may be used.
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# see bip49 for meaning of the meta vars
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# - single signer only
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CommonDerivations = [
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# name, path.format(), addr format
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( 'BIP-44 / Electrum', "m/44h/{coin_type}h/{account}h/{change}/{idx}", AF_CLASSIC ),
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( 'BIP-49 (P2WPKH-nested-in-P2SH)', "m/49h/{coin_type}h/{account}h/{change}/{idx}",
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AF_P2WPKH_P2SH ), # generates 3xxx/2xxx p2sh-looking addresses
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( 'BIP-84 (Native Segwit P2WPKH)', "m/84h/{coin_type}h/{account}h/{change}/{idx}",
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AF_P2WPKH ), # generates bc1 bech32 addresses
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]
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def verify_recover_pubkey(sig, digest):
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# verifies a message digest against a signature and recovers
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# the address type and public key that did the signing
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if len(sig) != 65:
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raise ValueError('signature length')
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v = sig[0]
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if 27 <= v <= 34:
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af = AF_CLASSIC
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elif 35 <= v <= 38:
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af = AF_P2WPKH_P2SH
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elif 39 <= v <= 42:
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af = AF_P2WPKH
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else:
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raise ValueError('unsupported recovery id: %d' % v)
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try:
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sig = ngu.secp256k1.signature(sig)
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return af, sig.verify_recover(digest).to_bytes()
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except:
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raise ValueError('invalid signature')
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# EOF
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