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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import annotations
import abc
import typing
from cryptography import utils
from cryptography.exceptions import UnsupportedAlgorithm, _Reasons
from cryptography.hazmat._oid import ObjectIdentifier
from cryptography.hazmat.bindings._rust import openssl as rust_openssl
from cryptography.hazmat.primitives import _serialization, hashes
from cryptography.hazmat.primitives.asymmetric import utils as asym_utils
class EllipticCurveOID:
SECP192R1 = ObjectIdentifier("1.2.840.10045.3.1.1")
SECP224R1 = ObjectIdentifier("1.3.132.0.33")
SECP256K1 = ObjectIdentifier("1.3.132.0.10")
SECP256R1 = ObjectIdentifier("1.2.840.10045.3.1.7")
SECP384R1 = ObjectIdentifier("1.3.132.0.34")
SECP521R1 = ObjectIdentifier("1.3.132.0.35")
BRAINPOOLP256R1 = ObjectIdentifier("1.3.36.3.3.2.8.1.1.7")
BRAINPOOLP384R1 = ObjectIdentifier("1.3.36.3.3.2.8.1.1.11")
BRAINPOOLP512R1 = ObjectIdentifier("1.3.36.3.3.2.8.1.1.13")
SECT163K1 = ObjectIdentifier("1.3.132.0.1")
SECT163R2 = ObjectIdentifier("1.3.132.0.15")
SECT233K1 = ObjectIdentifier("1.3.132.0.26")
SECT233R1 = ObjectIdentifier("1.3.132.0.27")
SECT283K1 = ObjectIdentifier("1.3.132.0.16")
SECT283R1 = ObjectIdentifier("1.3.132.0.17")
SECT409K1 = ObjectIdentifier("1.3.132.0.36")
SECT409R1 = ObjectIdentifier("1.3.132.0.37")
SECT571K1 = ObjectIdentifier("1.3.132.0.38")
SECT571R1 = ObjectIdentifier("1.3.132.0.39")
class EllipticCurve(metaclass=abc.ABCMeta):
@property
@abc.abstractmethod
def name(self) -> str:
"""
The name of the curve. e.g. secp256r1.
"""
@property
@abc.abstractmethod
def key_size(self) -> int:
"""
Bit size of a secret scalar for the curve.
"""
class EllipticCurveSignatureAlgorithm(metaclass=abc.ABCMeta):
@property
@abc.abstractmethod
def algorithm(
self,
) -> asym_utils.Prehashed | hashes.HashAlgorithm:
"""
The digest algorithm used with this signature.
"""
class EllipticCurvePrivateKey(metaclass=abc.ABCMeta):
@abc.abstractmethod
def exchange(
self, algorithm: ECDH, peer_public_key: EllipticCurvePublicKey
) -> bytes:
"""
Performs a key exchange operation using the provided algorithm with the
provided peer's public key.
"""
@abc.abstractmethod
def public_key(self) -> EllipticCurvePublicKey:
"""
The EllipticCurvePublicKey for this private key.
"""
@property
@abc.abstractmethod
def curve(self) -> EllipticCurve:
"""
The EllipticCurve that this key is on.
"""
@property
@abc.abstractmethod
def key_size(self) -> int:
"""
Bit size of a secret scalar for the curve.
"""
@abc.abstractmethod
def sign(
self,
data: bytes,
signature_algorithm: EllipticCurveSignatureAlgorithm,
) -> bytes:
"""
Signs the data
"""
@abc.abstractmethod
def private_numbers(self) -> EllipticCurvePrivateNumbers:
"""
Returns an EllipticCurvePrivateNumbers.
"""
@abc.abstractmethod
def private_bytes(
self,
encoding: _serialization.Encoding,
format: _serialization.PrivateFormat,
encryption_algorithm: _serialization.KeySerializationEncryption,
) -> bytes:
"""
Returns the key serialized as bytes.
"""
EllipticCurvePrivateKeyWithSerialization = EllipticCurvePrivateKey
EllipticCurvePrivateKey.register(rust_openssl.ec.ECPrivateKey)
class EllipticCurvePublicKey(metaclass=abc.ABCMeta):
@property
@abc.abstractmethod
def curve(self) -> EllipticCurve:
"""
The EllipticCurve that this key is on.
"""
@property
@abc.abstractmethod
def key_size(self) -> int:
"""
Bit size of a secret scalar for the curve.
"""
@abc.abstractmethod
def public_numbers(self) -> EllipticCurvePublicNumbers:
"""
Returns an EllipticCurvePublicNumbers.
"""
@abc.abstractmethod
def public_bytes(
self,
encoding: _serialization.Encoding,
format: _serialization.PublicFormat,
) -> bytes:
"""
Returns the key serialized as bytes.
"""
@abc.abstractmethod
def verify(
self,
signature: bytes,
data: bytes,
signature_algorithm: EllipticCurveSignatureAlgorithm,
) -> None:
"""
Verifies the signature of the data.
"""
@classmethod
def from_encoded_point(
cls, curve: EllipticCurve, data: bytes
) -> EllipticCurvePublicKey:
utils._check_bytes("data", data)
if len(data) == 0:
raise ValueError("data must not be an empty byte string")
if data[0] not in [0x02, 0x03, 0x04]:
raise ValueError("Unsupported elliptic curve point type")
return rust_openssl.ec.from_public_bytes(curve, data)
@abc.abstractmethod
def __eq__(self, other: object) -> bool:
"""
Checks equality.
"""
EllipticCurvePublicKeyWithSerialization = EllipticCurvePublicKey
EllipticCurvePublicKey.register(rust_openssl.ec.ECPublicKey)
EllipticCurvePrivateNumbers = rust_openssl.ec.EllipticCurvePrivateNumbers
EllipticCurvePublicNumbers = rust_openssl.ec.EllipticCurvePublicNumbers
class SECT571R1(EllipticCurve):
name = "sect571r1"
key_size = 570
class SECT409R1(EllipticCurve):
name = "sect409r1"
key_size = 409
class SECT283R1(EllipticCurve):
name = "sect283r1"
key_size = 283
class SECT233R1(EllipticCurve):
name = "sect233r1"
key_size = 233
class SECT163R2(EllipticCurve):
name = "sect163r2"
key_size = 163
class SECT571K1(EllipticCurve):
name = "sect571k1"
key_size = 571
class SECT409K1(EllipticCurve):
name = "sect409k1"
key_size = 409
class SECT283K1(EllipticCurve):
name = "sect283k1"
key_size = 283
class SECT233K1(EllipticCurve):
name = "sect233k1"
key_size = 233
class SECT163K1(EllipticCurve):
name = "sect163k1"
key_size = 163
class SECP521R1(EllipticCurve):
name = "secp521r1"
key_size = 521
class SECP384R1(EllipticCurve):
name = "secp384r1"
key_size = 384
class SECP256R1(EllipticCurve):
name = "secp256r1"
key_size = 256
class SECP256K1(EllipticCurve):
name = "secp256k1"
key_size = 256
class SECP224R1(EllipticCurve):
name = "secp224r1"
key_size = 224
class SECP192R1(EllipticCurve):
name = "secp192r1"
key_size = 192
class BrainpoolP256R1(EllipticCurve):
name = "brainpoolP256r1"
key_size = 256
class BrainpoolP384R1(EllipticCurve):
name = "brainpoolP384r1"
key_size = 384
class BrainpoolP512R1(EllipticCurve):
name = "brainpoolP512r1"
key_size = 512
_CURVE_TYPES: dict[str, EllipticCurve] = {
"prime192v1": SECP192R1(),
"prime256v1": SECP256R1(),
"secp192r1": SECP192R1(),
"secp224r1": SECP224R1(),
"secp256r1": SECP256R1(),
"secp384r1": SECP384R1(),
"secp521r1": SECP521R1(),
"secp256k1": SECP256K1(),
"sect163k1": SECT163K1(),
"sect233k1": SECT233K1(),
"sect283k1": SECT283K1(),
"sect409k1": SECT409K1(),
"sect571k1": SECT571K1(),
"sect163r2": SECT163R2(),
"sect233r1": SECT233R1(),
"sect283r1": SECT283R1(),
"sect409r1": SECT409R1(),
"sect571r1": SECT571R1(),
"brainpoolP256r1": BrainpoolP256R1(),
"brainpoolP384r1": BrainpoolP384R1(),
"brainpoolP512r1": BrainpoolP512R1(),
}
class ECDSA(EllipticCurveSignatureAlgorithm):
def __init__(
self,
algorithm: asym_utils.Prehashed | hashes.HashAlgorithm,
deterministic_signing: bool = False,
):
from cryptography.hazmat.backends.openssl.backend import backend
if (
deterministic_signing
and not backend.ecdsa_deterministic_supported()
):
raise UnsupportedAlgorithm(
"ECDSA with deterministic signature (RFC 6979) is not "
"supported by this version of OpenSSL.",
_Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM,
)
self._algorithm = algorithm
self._deterministic_signing = deterministic_signing
@property
def algorithm(
self,
) -> asym_utils.Prehashed | hashes.HashAlgorithm:
return self._algorithm
@property
def deterministic_signing(
self,
) -> bool:
return self._deterministic_signing
generate_private_key = rust_openssl.ec.generate_private_key
def derive_private_key(
private_value: int,
curve: EllipticCurve,
backend: typing.Any = None,
) -> EllipticCurvePrivateKey:
if not isinstance(private_value, int):
raise TypeError("private_value must be an integer type.")
if private_value <= 0:
raise ValueError("private_value must be a positive integer.")
return rust_openssl.ec.derive_private_key(private_value, curve)
class ECDH:
pass
_OID_TO_CURVE = {
EllipticCurveOID.SECP192R1: SECP192R1,
EllipticCurveOID.SECP224R1: SECP224R1,
EllipticCurveOID.SECP256K1: SECP256K1,
EllipticCurveOID.SECP256R1: SECP256R1,
EllipticCurveOID.SECP384R1: SECP384R1,
EllipticCurveOID.SECP521R1: SECP521R1,
EllipticCurveOID.BRAINPOOLP256R1: BrainpoolP256R1,
EllipticCurveOID.BRAINPOOLP384R1: BrainpoolP384R1,
EllipticCurveOID.BRAINPOOLP512R1: BrainpoolP512R1,
EllipticCurveOID.SECT163K1: SECT163K1,
EllipticCurveOID.SECT163R2: SECT163R2,
EllipticCurveOID.SECT233K1: SECT233K1,
EllipticCurveOID.SECT233R1: SECT233R1,
EllipticCurveOID.SECT283K1: SECT283K1,
EllipticCurveOID.SECT283R1: SECT283R1,
EllipticCurveOID.SECT409K1: SECT409K1,
EllipticCurveOID.SECT409R1: SECT409R1,
EllipticCurveOID.SECT571K1: SECT571K1,
EllipticCurveOID.SECT571R1: SECT571R1,
}
def get_curve_for_oid(oid: ObjectIdentifier) -> type[EllipticCurve]:
try:
return _OID_TO_CURVE[oid]
except KeyError:
raise LookupError(
"The provided object identifier has no matching elliptic "
"curve class"
)