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Merged
Randy808 merged 1 commit into from
Sep 2, 2026
Merged

Resolved dependabot alerts. #8

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20 changes: 14 additions & 6 deletions sdk/examples/remote-signer/app/signer.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,11 @@
import hashlib
import ecdsa
from ecdsa import SECP256k1

from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import ec
from cryptography.hazmat.primitives.asymmetric.utils import (
Prehashed,
decode_dss_signature,
)

# secp256k1 curve order half (for low-S check)
_HALF_ORDER = 0x3FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DBFE92F1A9F2A0746
Expand Down Expand Up @@ -29,14 +34,17 @@ def _bitcoin_message_magic(message: bytes) -> bytes:

def sign_bytes(message: bytes, private_key_bytes: bytes) -> str:
"""Sign message bytes using the Bitcoin signed message format."""
privkey = ecdsa.SigningKey.from_string(private_key_bytes, curve=SECP256k1)
privkey = ec.derive_private_key(
int.from_bytes(private_key_bytes, "big"), ec.SECP256K1()
)

prefixed = _bitcoin_message_magic(message)
digest = hashlib.sha256(hashlib.sha256(prefixed).digest()).digest()
raw = privkey.sign_digest(digest, sigencode=ecdsa.util.sigencode_string)
der_sig = privkey.sign(digest, ec.ECDSA(Prehashed(hashes.SHA256())))
r, s = decode_dss_signature(der_sig)
raw = r.to_bytes(32, "big") + s.to_bytes(32, "big")

s_int = int.from_bytes(raw[32:], "big")
rec_id = 27 if s_int <= _HALF_ORDER else 28
rec_id = 27 if s <= _HALF_ORDER else 28

return bytes([rec_id]).hex() + raw.hex()

Expand Down
8 changes: 4 additions & 4 deletions sdk/examples/remote-signer/requirements.txt
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
fastapi==0.115.6
uvicorn==0.34.0
ecdsa==0.19.1
python-dotenv==1.0.1
pytest==8.3.4
pytest-asyncio==0.25.2
cryptography==44.0.0
python-dotenv==1.2.2
pytest==9.0.3
pytest-asyncio==1.4.0
httpx==0.28.1
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