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BIP-352: take use of vendored secp256k1lab for reference implementation

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This allows to remove secp256k1.py and replace the secp256k1-specific
parts in the reference implementation. Replacement guide:

    * ECKey -> Scalar
    * ECKey.set(seckey_bytes) -> Scalar.from_bytes_checked(seckey_bytes)
    * seckey.get_pubkey() -> seckey * G
    * seckey.get_bytes() -> seckey.to_bytes()
    * seckey.add(tweak_bytes) -> seckey + Scalar.from_bytes_checked(tweak_bytes)
    * seckey.negate() -> seckey = -seckey
    * seckey.sign_schnorr -> schnorr_sign(..., seckey.to_bytes(), ...)

    * ECPubKey -> GE
    * ECPubKey.set(pubkey_bytes) -> GE.from_bytes_{xonly,compressed}(pubkey_bytes)
    * pubkey.get_y() % 2 == 0 -> pubkey.has_even_y()
    * pubkey.get_bytes(False) -> pubkey.to_bytes_compressed()
    * pubkey.get_bytes() -> pubkey.to_bytes_xonly()
    * not pubkey.valid -> pubkey.infinity
    * pubkey.verify_schnorr -> schnorr_verify(..., pubkey.to_bytes_xonly(), ...)

    * TaggedHash -> tagged_hash
    * hashlib.sha256(preimage).digest() -> hash_sha256(preimage)
This commit is contained in:
Sebastian Falbesoner
2026-01-16 16:26:23 +01:00
parent 511bb99dc4
commit f2ffa99a4a
3 changed files with 106 additions and 802 deletions
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4
bip-0352/bitcoin_utils.py
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@@ -2,7 +2,7 @@ import hashlib
import struct
from io import BytesIO
from ripemd160 import ripemd160
from secp256k1 import ECKey
from secp256k1lab.secp256k1 import Scalar
from typing import Union
@@ -93,7 +93,7 @@ class VinInfo:
else:
self.txinwitness = txinwitness
if private_key is None:
self.private_key = ECKey()
self.private_key = Scalar()
else:
self.private_key = private_key
self.scriptSig = scriptSig