# Copyright (c) 2026 Emanuele Bellocchia
#
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# of this software and associated documentation files (the "Software"), to deal
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# furnished to do so, subject to the following conditions:
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# The above copyright notice and this permission notice shall be included in
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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"""Module for secp256k1 keys based on coincurve library."""
# Imports
from typing import Any
import coincurve
from typing_extensions import override
from bip_utils.ecc.common.ikeys import IPrivateKey, IPublicKey
from bip_utils.ecc.common.ipoint import IPoint
from bip_utils.ecc.curve.elliptic_curve_types import EllipticCurveTypes
from bip_utils.ecc.ecdsa.ecdsa_keys import EcdsaKeysConst
from bip_utils.ecc.secp256k1.secp256k1_point_coincurve import Secp256k1PointCoincurve
from bip_utils.utils.misc import DataBytes
class Secp256k1PublicKeyCoincurve(IPublicKey):
"""Secp256k1 public key class."""
m_ver_key: coincurve.PublicKey
@override
@classmethod
def FromBytes(cls,
key_bytes: bytes) -> IPublicKey:
"""
Construct class from key bytes.
Args:
key_bytes (bytes): Key bytes
Returns:
IPublicKey: IPublicKey object
Raises:
ValueError: If key bytes are not valid
"""
try:
return cls(coincurve.PublicKey(key_bytes))
except ValueError as ex:
raise ValueError("Invalid public key bytes") from ex
@override
@classmethod
def FromPoint(cls,
key_point: IPoint) -> IPublicKey:
"""
Construct class from key point.
Args:
key_point (IPoint object): Key point
Returns:
IPublicKey: IPublicKey object
Raises:
ValueError: If key point is not valid
"""
try:
return cls(
coincurve.PublicKey.from_point(key_point.X(),
key_point.Y())
)
except ValueError as ex:
raise ValueError("Invalid public key point") from ex
def __init__(self,
key_obj: coincurve.PublicKey) -> None:
"""
Construct class from key object.
Args:
key_obj (coincurve.PublicKey): Key object
"""
self.m_ver_key = key_obj
@override
@staticmethod
def CurveType() -> EllipticCurveTypes:
"""
Get the elliptic curve type.
Returns:
EllipticCurveTypes: Elliptic curve type
"""
return EllipticCurveTypes.SECP256K1
@override
@staticmethod
def CompressedLength() -> int:
"""
Get the compressed key length.
Returns:
int: Compressed key length
"""
return EcdsaKeysConst.PUB_KEY_COMPRESSED_BYTE_LEN
@override
@staticmethod
def UncompressedLength() -> int:
"""
Get the uncompressed key length.
Returns:
int: Uncompressed key length
"""
return EcdsaKeysConst.PUB_KEY_UNCOMPRESSED_BYTE_LEN
@override
def UnderlyingObject(self) -> Any:
"""
Get the underlying object.
Returns:
Any: Underlying object
"""
return self.m_ver_key
@override
def RawCompressed(self) -> DataBytes:
"""
Return raw compressed public key.
Returns:
DataBytes object: DataBytes object
"""
return DataBytes(self.m_ver_key.format(True))
@override
def RawUncompressed(self) -> DataBytes:
"""
Return raw uncompressed public key.
Returns:
DataBytes object: DataBytes object
"""
return DataBytes(self.m_ver_key.format(False))
@override
def Point(self) -> IPoint:
"""
Get public key point.
Returns:
IPoint object: IPoint object
"""
point = self.m_ver_key.point()
return Secp256k1PointCoincurve.FromCoordinates(point[0], point[1])
class Secp256k1PrivateKeyCoincurve(IPrivateKey):
"""Secp256k1 private key class."""
m_sign_key: coincurve.PrivateKey
@override
@classmethod
def FromBytes(cls,
key_bytes: bytes) -> IPrivateKey:
"""
Construct class from key bytes.
Args:
key_bytes (bytes): Key bytes
Returns:
IPrivateKey: IPrivateKey object
Raises:
ValueError: If key bytes are not valid
"""
# Check here because the library does not raise any exception
if len(key_bytes) != cls.Length():
raise ValueError("Invalid private key bytes")
try:
return cls(coincurve.PrivateKey(key_bytes))
except ValueError as ex:
raise ValueError("Invalid private key bytes") from ex
def __init__(self,
key_obj: coincurve.PrivateKey) -> None:
"""
Construct class from key object.
Args:
key_obj (coincurve.PrivateKey): Key object
"""
self.m_sign_key = key_obj
@override
@staticmethod
def CurveType() -> EllipticCurveTypes:
"""
Get the elliptic curve type.
Returns:
EllipticCurveTypes: Elliptic curve type
"""
return EllipticCurveTypes.SECP256K1
@override
@staticmethod
def Length() -> int:
"""
Get the key length.
Returns:
int: Key length
"""
return EcdsaKeysConst.PRIV_KEY_BYTE_LEN
@override
def UnderlyingObject(self) -> Any:
"""
Get the underlying object.
Returns:
Any: Underlying object
"""
return self.m_sign_key
@override
def Raw(self) -> DataBytes:
"""
Return raw private key.
Returns:
DataBytes object: DataBytes object
"""
return DataBytes(self.m_sign_key.secret)
@override
def PublicKey(self) -> IPublicKey:
"""
Get the public key correspondent to the private one.
Returns:
IPublicKey object: IPublicKey object
"""
return Secp256k1PublicKeyCoincurve(self.m_sign_key.public_key)