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https://github.com/Such-Software/wowcheckout.git
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jwinterm
20eff23335
The monero Python library assumes 1-byte network prefixes (Monero format). Wownero uses 2-byte varint prefixes (base58 prefix 4146 for primary, 12208 for subaddress), so Address() was rejecting valid Wownero addresses with "Primary address is invalid". Replace monero lib Address usage with native Wownero validation: - Correct netbytes: 0xb2 (primary), 0xb0 (subaddress), 0xb3 (integrated) - 2-byte varint prefix offset for key extraction (bytes 2-33, 34-65) - 2-byte varint prefix in subaddress derivation encoding
54 lines
1.9 KiB
Python
54 lines
1.9 KiB
Python
from __future__ import annotations
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from binascii import hexlify, unhexlify
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import struct
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from monero import base58, ed25519
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from monero.keccak import keccak_256
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# Wownero network prefix bytes (first byte of varint-encoded base58 prefix).
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# Primary: base58 prefix 4146 -> varint [0xb2, 0x20] -> "Wo"
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# Subaddr: base58 prefix 12208 -> varint [0xb0, 0x5f] -> "Ww"
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_WOW_PRIMARY_VARINT = bytes([0xb2, 0x20])
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_WOW_SUBADDR_VARINT = bytes([0xb0, 0x5f])
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def _decode_wow_address(payment_address: str) -> tuple[bytes, bytes]:
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"""Decode a Wownero primary address and return (pub_spend, pub_view) as raw bytes."""
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decoded = bytearray(unhexlify(base58.decode(payment_address)))
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# Verify checksum
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if decoded[-4:] != keccak_256(decoded[:-4]).digest()[:4]:
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raise ValueError("Invalid checksum")
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if decoded[0] != _WOW_PRIMARY_VARINT[0]:
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raise ValueError(f"Not a Wownero primary address (netbyte {decoded[0]})")
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# 2-byte varint prefix, then 32-byte spend key, 32-byte view key, 4-byte checksum
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pub_spend = bytes(decoded[2:34])
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pub_view = bytes(decoded[34:66])
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return pub_spend, pub_view
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def derive_subaddress(
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*,
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payment_address: str,
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view_key: str,
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account_index: int,
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address_index: int,
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) -> str:
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"""Derive a Wownero subaddress from a primary address and secret view key."""
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pub_spend, _pub_view = _decode_wow_address(payment_address)
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view_key_bytes = unhexlify(view_key)
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data = (
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b"SubAddr\0"
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+ view_key_bytes
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+ struct.pack("<II", account_index, address_index)
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)
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m = ed25519.scalar_reduce(keccak_256(data).digest())
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mG = ed25519.scalarmult_B(m)
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D = ed25519.edwards_add(pub_spend, mG)
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C = ed25519.scalarmult(view_key_bytes, D)
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# Wownero subaddress uses 2-byte varint prefix
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payload = bytearray(_WOW_SUBADDR_VARINT) + D + C
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checksum = keccak_256(payload).digest()[:4]
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return base58.encode(hexlify(payload + checksum))
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