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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 absolute_import, division, print_function

import abc

import six

from cryptography import utils


@six.add_metaclass(abc.ABCMeta)
class EllipticCurve(object):
    @abc.abstractproperty
    def name(self):
        """
        The name of the curve. e.g. secp256r1.
        """

    @abc.abstractproperty
    def key_size(self):
        """
        Bit size of a secret scalar for the curve.
        """


@six.add_metaclass(abc.ABCMeta)
class EllipticCurveSignatureAlgorithm(object):
    @abc.abstractproperty
    def algorithm(self):
        """
        The digest algorithm used with this signature.
        """


@six.add_metaclass(abc.ABCMeta)
class EllipticCurvePrivateKey(object):
    @abc.abstractmethod
    def signer(self, signature_algorithm):
        """
        Returns an AsymmetricSignatureContext used for signing data.
        """

    @abc.abstractmethod
    def exchange(self, algorithm, peer_public_key):
        """
        Performs a key exchange operation using the provided algorithm with the
        provided peer's public key.
        """

    @abc.abstractmethod
    def public_key(self):
        """
        The EllipticCurvePublicKey for this private key.
        """

    @abc.abstractproperty
    def curve(self):
        """
        The EllipticCurve that this key is on.
        """

    @abc.abstractproperty
    def key_size(self):
        """
        Bit size of a secret scalar for the curve.
        """

    @abc.abstractproperty
    def sign(self, data, signature_algorithm):
        """
        Signs the data
        """


@six.add_metaclass(abc.ABCMeta)
class EllipticCurvePrivateKeyWithSerialization(EllipticCurvePrivateKey):
    @abc.abstractmethod
    def private_numbers(self):
        """
        Returns an EllipticCurvePrivateNumbers.
        """

    @abc.abstractmethod
    def private_bytes(self, encoding, format, encryption_algorithm):
        """
        Returns the key serialized as bytes.
        """


@six.add_metaclass(abc.ABCMeta)
class EllipticCurvePublicKey(object):
    @abc.abstractmethod
    def verifier(self, signature, signature_algorithm):
        """
        Returns an AsymmetricVerificationContext used for signing data.
        """

    @abc.abstractproperty
    def curve(self):
        """
        The EllipticCurve that this key is on.
        """

    @abc.abstractproperty
    def key_size(self):
        """
        Bit size of a secret scalar for the curve.
        """

    @abc.abstractmethod
    def public_numbers(self):
        """
        Returns an EllipticCurvePublicNumbers.
        """

    @abc.abstractmethod
    def public_bytes(self, encoding, format):
        """
        Returns the key serialized as bytes.
        """

    @abc.abstractmethod
    def verify(self, signature, data, signature_algorithm):
        """
        Verifies the signature of the data.
        """


EllipticCurvePublicKeyWithSerialization = EllipticCurvePublicKey


@utils.register_interface(EllipticCurve)
class SECT571R1(object):
    name = "sect571r1"
    key_size = 571


@utils.register_interface(EllipticCurve)
class SECT409R1(object):
    name = "sect409r1"
    key_size = 409


@utils.register_interface(EllipticCurve)
class SECT283R1(object):
    name = "sect283r1"
    key_size = 283


@utils.register_interface(EllipticCurve)
class SECT233R1(object):
    name = "sect233r1"
    key_size = 233


@utils.register_interface(EllipticCurve)
class SECT163R2(object):
    name = "sect163r2"
    key_size = 163


@utils.register_interface(EllipticCurve)
class SECT571K1(object):
    name = "sect571k1"
    key_size = 571


@utils.register_interface(EllipticCurve)
class SECT409K1(object):
    name = "sect409k1"
    key_size = 409


@utils.register_interface(EllipticCurve)
class SECT283K1(object):
    name = "sect283k1"
    key_size = 283


@utils.register_interface(EllipticCurve)
class SECT233K1(object):
    name = "sect233k1"
    key_size = 233


@utils.register_interface(EllipticCurve)
class SECT163K1(object):
    name = "sect163k1"
    key_size = 163


@utils.register_interface(EllipticCurve)
class SECP521R1(object):
    name = "secp521r1"
    key_size = 521


@utils.register_interface(EllipticCurve)
class SECP384R1(object):
    name = "secp384r1"
    key_size = 384


@utils.register_interface(EllipticCurve)
class SECP256R1(object):
    name = "secp256r1"
    key_size = 256


@utils.register_interface(EllipticCurve)
class SECP256K1(object):
    name = "secp256k1"
    key_size = 256


@utils.register_interface(EllipticCurve)
class SECP224R1(object):
    name = "secp224r1"
    key_size = 224


@utils.register_interface(EllipticCurve)
class SECP192R1(object):
    name = "secp192r1"
    key_size = 192


_CURVE_TYPES = {
    "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,
}


@utils.register_interface(EllipticCurveSignatureAlgorithm)
class ECDSA(object):
    def __init__(self, algorithm):
        self._algorithm = algorithm

    algorithm = utils.read_only_property("_algorithm")


def generate_private_key(curve, backend):
    return backend.generate_elliptic_curve_private_key(curve)


def derive_private_key(private_value, curve, backend):
    if not isinstance(private_value, six.integer_types):
        raise TypeError("private_value must be an integer type.")

    if private_value <= 0:
        raise ValueError("private_value must be a positive integer.")

    if not isinstance(curve, EllipticCurve):
        raise TypeError("curve must provide the EllipticCurve interface.")

    return backend.derive_elliptic_curve_private_key(private_value, curve)


class EllipticCurvePublicNumbers(object):
    def __init__(self, x, y, curve):
        if (
            not isinstance(x, six.integer_types) or
            not isinstance(y, six.integer_types)
        ):
            raise TypeError("x and y must be integers.")

        if not isinstance(curve, EllipticCurve):
            raise TypeError("curve must provide the EllipticCurve interface.")

        self._y = y
        self._x = x
        self._curve = curve

    def public_key(self, backend):
        return backend.load_elliptic_curve_public_numbers(self)

    def encode_point(self):
        # key_size is in bits. Convert to bytes and round up
        byte_length = (self.curve.key_size + 7) // 8
        return (
            b'\x04' + utils.int_to_bytes(self.x, byte_length) +
            utils.int_to_bytes(self.y, byte_length)
        )

    @classmethod
    def from_encoded_point(cls, curve, data):
        if not isinstance(curve, EllipticCurve):
            raise TypeError("curve must be an EllipticCurve instance")

        if data.startswith(b'\x04'):
            # key_size is in bits. Convert to bytes and round up
            byte_length = (curve.key_size + 7) // 8
            if len(data) == 2 * byte_length + 1:
                x = utils.int_from_bytes(data[1:byte_length + 1], 'big')
                y = utils.int_from_bytes(data[byte_length + 1:], 'big')
                return cls(x, y, curve)
            else:
                raise ValueError('Invalid elliptic curve point data length')
        else:
            raise ValueError('Unsupported elliptic curve point type')

    curve = utils.read_only_property("_curve")
    x = utils.read_only_property("_x")
    y = utils.read_only_property("_y")

    def __eq__(self, other):
        if not isinstance(other, EllipticCurvePublicNumbers):
            return NotImplemented

        return (
            self.x == other.x and
            self.y == other.y and
            self.curve.name == other.curve.name and
            self.curve.key_size == other.curve.key_size
        )

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash((self.x, self.y, self.curve.name, self.curve.key_size))

    def __repr__(self):
        return (
            "<EllipticCurvePublicNumbers(curve={0.curve.name}, x={0.x}, "
            "y={0.y}>".format(self)
        )


class EllipticCurvePrivateNumbers(object):
    def __init__(self, private_value, public_numbers):
        if not isinstance(private_value, six.integer_types):
            raise TypeError("private_value must be an integer.")

        if not isinstance(public_numbers, EllipticCurvePublicNumbers):
            raise TypeError(
                "public_numbers must be an EllipticCurvePublicNumbers "
                "instance."
            )

        self._private_value = private_value
        self._public_numbers = public_numbers

    def private_key(self, backend):
        return backend.load_elliptic_curve_private_numbers(self)

    private_value = utils.read_only_property("_private_value")
    public_numbers = utils.read_only_property("_public_numbers")

    def __eq__(self, other):
        if not isinstance(other, EllipticCurvePrivateNumbers):
            return NotImplemented

        return (
            self.private_value == other.private_value and
            self.public_numbers == other.public_numbers
        )

    def __ne__(self, other):
        return not self == other

    def __hash__(self):
        return hash((self.private_value, self.public_numbers))


class ECDH(object):
    pass

Filemanager

Name Type Size Permission Actions
__pycache__ Folder 0755
__init__.py File 1020 B 0644
dh.py File 5.33 KB 0644
dsa.py File 6.73 KB 0644
ec.py File 9.59 KB 0644
padding.py File 2.21 KB 0644
rsa.py File 10.08 KB 0644
utils.py File 1.68 KB 0644
x25519.py File 1.61 KB 0644