奇亚(Chia, XCH) 核心之 `xch` 地址和 `puzzle_hash` 之间的相互转换

yufei       4 月, 3 周 前       188

奇亚(Chia, XCH) 核心之 xch 地址和 puzzle_hash 之间的相互转换,这个转换应该来说是至关重要的。

xch 开头的 address 便于我们直观使用,而 puzzle_hash 则便于程序使用

相关的程序如下,对了,使用 Python3 写的

import io
from typing import List, Optional, Tuple
from typing import Any, BinaryIO


def hexstr_to_bytes(input_str: str) -> bytes:
    """
    Converts a hex string into bytes, removing the 0x if it's present.
    """
    if input_str.startswith("0x") or input_str.startswith("0X"):
        return bytes.fromhex(input_str[2:])
    return bytes.fromhex(input_str)


def make_sized_bytes(size: int):
    """
    Create a streamable type that subclasses "bytes" but requires instances
    to be a certain, fixed size.
    """
    name = "bytes%d" % size

    def __new__(cls, v):
        v = bytes(v)
        if not isinstance(v, bytes) or len(v) != size:
            raise ValueError("bad %s initializer %s" % (name, v))
        return bytes.__new__(cls, v)  # type: ignore

    @classmethod  # type: ignore
    def parse(cls, f: BinaryIO) -> Any:
        b = f.read(size)
        assert len(b) == size
        return cls(b)

    def stream(self, f):
        f.write(self)

    @classmethod  # type: ignore
    def from_bytes(cls: Any, blob: bytes) -> Any:
        # pylint: disable=no-member
        f = io.BytesIO(blob)
        result = cls.parse(f)
        assert f.read() == b""
        return result

    def __bytes__(self: Any) -> bytes:
        f = io.BytesIO()
        self.stream(f)
        return bytes(f.getvalue())

    def __str__(self):
        return self.hex()

    def __repr__(self):
        return "<%s: %s>" % (self.__class__.__name__, str(self))

    namespace = dict(
        __new__=__new__,
        parse=parse,
        stream=stream,
        from_bytes=from_bytes,
        __bytes__=__bytes__,
        __str__=__str__,
        __repr__=__repr__,
    )

    return type(name, (bytes,), namespace)

bytes32 = make_sized_bytes(32)

CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"


def bech32_polymod(values: List[int]) -> int:
    """Internal function that computes the Bech32 checksum."""
    generator = [0x3B6A57B2, 0x26508E6D, 0x1EA119FA, 0x3D4233DD, 0x2A1462B3]
    chk = 1
    for value in values:
        top = chk >> 25
        chk = (chk & 0x1FFFFFF) << 5 ^ value
        for i in range(5):
            chk ^= generator[i] if ((top >> i) & 1) else 0
    return chk


def bech32_hrp_expand(hrp: str) -> List[int]:
    """Expand the HRP into values for checksum computation."""
    return [ord(x) >> 5 for x in hrp] + [0] + [ord(x) & 31 for x in hrp]


M = 0x2BC830A3


def bech32_verify_checksum(hrp: str, data: List[int]) -> bool:
    return bech32_polymod(bech32_hrp_expand(hrp) + data) == M


def bech32_create_checksum(hrp: str, data: List[int]) -> List[int]:
    values = bech32_hrp_expand(hrp) + data
    polymod = bech32_polymod(values + [0, 0, 0, 0, 0, 0]) ^ M
    return [(polymod >> 5 * (5 - i)) & 31 for i in range(6)]


def bech32_encode(hrp: str, data: List[int]) -> str:
    """Compute a Bech32 string given HRP and data values."""
    combined = data + bech32_create_checksum(hrp, data)
    return hrp + "1" + "".join([CHARSET[d] for d in combined])


def bech32_decode(bech: str) -> Tuple[Optional[str], Optional[List[int]]]:
    """Validate a Bech32 string, and determine HRP and data."""
    if (any(ord(x) < 33 or ord(x) > 126 for x in bech)) or (bech.lower() != bech and bech.upper() != bech):
        return (None, None)
    bech = bech.lower()
    pos = bech.rfind("1")
    if pos < 1 or pos + 7 > len(bech) or len(bech) > 90:
        return (None, None)
    if not all(x in CHARSET for x in bech[pos + 1 :]):
        return (None, None)
    hrp = bech[:pos]
    data = [CHARSET.find(x) for x in bech[pos + 1 :]]
    if not bech32_verify_checksum(hrp, data):
        return (None, None)
    return hrp, data[:-6]


def convertbits(data: List[int], frombits: int, tobits: int, pad: bool = True) -> List[int]:
    """General power-of-2 base conversion."""
    acc = 0
    bits = 0
    ret = []
    maxv = (1 << tobits) - 1
    max_acc = (1 << (frombits + tobits - 1)) - 1
    for value in data:
        if value < 0 or (value >> frombits):
            raise ValueError("Invalid Value")
        acc = ((acc << frombits) | value) & max_acc
        bits += frombits
        while bits >= tobits:
            bits -= tobits
            ret.append((acc >> bits) & maxv)
    if pad:
        if bits:
            ret.append((acc << (tobits - bits)) & maxv)
    elif bits >= frombits or ((acc << (tobits - bits)) & maxv):
        raise ValueError("Invalid bits")
    return ret


def encode_puzzle_hash(puzzle_hash: bytes32, prefix: str) -> str:
    encoded = bech32_encode(prefix, convertbits(puzzle_hash, 8, 5))
    return encoded


def decode_puzzle_hash(address: str) -> bytes32:
    hrpgot, data = bech32_decode(address)
    if data is None:
        raise ValueError("Invalid Address")
    decoded = convertbits(data, 5, 8, False)
    decoded_bytes = bytes(decoded)
    return decoded_bytes

使用方式如下

xch 地址转换为 puzzle_hash

bb = hexstr_to_bytes("0xe1e45b735b87f904c85d10104191af5988449a6ddb12a913e8f3478eb028fa9c")
print(encode_puzzle_hash(bytes32.from_bytes(bb),"xch"))

puzzle_hash 生成 xch 地址

    bc = decode_puzzle_hash("xch1u8j9ku6mslusfjzazqgyryd0txyyfxndmvf2jylg7drcavpgl2wqka6kyx")
    print(encode_puzzle_hash(bc,"xch"))
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