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btc: grind for low-r value signatures to match core

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This commit is contained in:
tecnovert
2025-10-03 10:36:29 +02:00
parent 071675d359
commit a6c2251146
2 changed files with 16 additions and 1 deletions
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13
basicswap/interface/btc.py
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@@ -53,6 +53,7 @@ from coincurve.keys import (
PrivateKey,
PublicKey,
)
from coincurve.types import ffi
from coincurve.ecdsaotves import (
ecdsaotves_enc_sign,
ecdsaotves_enc_verify,
@@ -1357,7 +1358,17 @@ class BTCInterface(Secp256k1Interface):
)
eck = PrivateKey(key_bytes)
return eck.sign(sig_hash, hasher=None) + bytes((SIGHASH_ALL,))
for i in range(10000):
# Grind for low-R value
if i == 0:
nonce = (ffi.NULL, ffi.NULL)
else:
extra_entropy = i.to_bytes(4, "little") + (b"\0" * 28)
nonce = (ffi.NULL, ffi.new("unsigned char [32]", extra_entropy))
sig = eck.sign(sig_hash, hasher=None, custom_nonce=nonce)
if len(sig) < 71:
return sig + bytes((SIGHASH_ALL,))
raise RuntimeError("sign failed.")
def signTxOtVES(
self,