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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 cryptography import utils
from cryptography.exceptions import (
    InvalidSignature,
    UnsupportedAlgorithm,
    _Reasons,
)
from cryptography.hazmat.backends.openssl.utils import (
    _calculate_digest_and_algorithm,
    _check_not_prehashed,
    _evp_pkey_derive,
    _warn_sign_verify_deprecated,
)
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import (
    AsymmetricSignatureContext,
    AsymmetricVerificationContext,
    ec,
)


def _check_signature_algorithm(
    signature_algorithm: ec.EllipticCurveSignatureAlgorithm,
):
    if not isinstance(signature_algorithm, ec.ECDSA):
        raise UnsupportedAlgorithm(
            "Unsupported elliptic curve signature algorithm.",
            _Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM,
        )


def _ec_key_curve_sn(backend, ec_key):
    group = backend._lib.EC_KEY_get0_group(ec_key)
    backend.openssl_assert(group != backend._ffi.NULL)

    nid = backend._lib.EC_GROUP_get_curve_name(group)
    # The following check is to find EC keys with unnamed curves and raise
    # an error for now.
    if nid == backend._lib.NID_undef:
        raise ValueError(
            "ECDSA keys with explicit parameters are unsupported at this time"
        )

    # This is like the above check, but it also catches the case where you
    # explicitly encoded a curve with the same parameters as a named curve.
    # Don't do that.
    if (
        not backend._lib.CRYPTOGRAPHY_IS_LIBRESSL
        and backend._lib.EC_GROUP_get_asn1_flag(group) == 0
    ):
        raise ValueError(
            "ECDSA keys with explicit parameters are unsupported at this time"
        )

    curve_name = backend._lib.OBJ_nid2sn(nid)
    backend.openssl_assert(curve_name != backend._ffi.NULL)

    sn = backend._ffi.string(curve_name).decode("ascii")
    return sn


def _mark_asn1_named_ec_curve(backend, ec_cdata):
    """
    Set the named curve flag on the EC_KEY. This causes OpenSSL to
    serialize EC keys along with their curve OID which makes
    deserialization easier.
    """

    backend._lib.EC_KEY_set_asn1_flag(
        ec_cdata, backend._lib.OPENSSL_EC_NAMED_CURVE
    )


def _sn_to_elliptic_curve(backend, sn):
    try:
        return ec._CURVE_TYPES[sn]()
    except KeyError:
        raise UnsupportedAlgorithm(
            "{} is not a supported elliptic curve".format(sn),
            _Reasons.UNSUPPORTED_ELLIPTIC_CURVE,
        )


def _ecdsa_sig_sign(backend, private_key, data):
    max_size = backend._lib.ECDSA_size(private_key._ec_key)
    backend.openssl_assert(max_size > 0)

    sigbuf = backend._ffi.new("unsigned char[]", max_size)
    siglen_ptr = backend._ffi.new("unsigned int[]", 1)
    res = backend._lib.ECDSA_sign(
        0, data, len(data), sigbuf, siglen_ptr, private_key._ec_key
    )
    backend.openssl_assert(res == 1)
    return backend._ffi.buffer(sigbuf)[: siglen_ptr[0]]


def _ecdsa_sig_verify(backend, public_key, signature, data):
    res = backend._lib.ECDSA_verify(
        0, data, len(data), signature, len(signature), public_key._ec_key
    )
    if res != 1:
        backend._consume_errors()
        raise InvalidSignature


class _ECDSASignatureContext(AsymmetricSignatureContext):
    def __init__(
        self,
        backend,
        private_key: ec.EllipticCurvePrivateKey,
        algorithm: hashes.HashAlgorithm,
    ):
        self._backend = backend
        self._private_key = private_key
        self._digest = hashes.Hash(algorithm, backend)

    def update(self, data: bytes) -> None:
        self._digest.update(data)

    def finalize(self) -> bytes:
        digest = self._digest.finalize()

        return _ecdsa_sig_sign(self._backend, self._private_key, digest)


class _ECDSAVerificationContext(AsymmetricVerificationContext):
    def __init__(
        self,
        backend,
        public_key: ec.EllipticCurvePublicKey,
        signature: bytes,
        algorithm: hashes.HashAlgorithm,
    ):
        self._backend = backend
        self._public_key = public_key
        self._signature = signature
        self._digest = hashes.Hash(algorithm, backend)

    def update(self, data: bytes) -> None:
        self._digest.update(data)

    def verify(self) -> None:
        digest = self._digest.finalize()
        _ecdsa_sig_verify(
            self._backend, self._public_key, self._signature, digest
        )


class _EllipticCurvePrivateKey(ec.EllipticCurvePrivateKey):
    def __init__(self, backend, ec_key_cdata, evp_pkey):
        self._backend = backend
        self._ec_key = ec_key_cdata
        self._evp_pkey = evp_pkey

        sn = _ec_key_curve_sn(backend, ec_key_cdata)
        self._curve = _sn_to_elliptic_curve(backend, sn)
        _mark_asn1_named_ec_curve(backend, ec_key_cdata)

    curve = utils.read_only_property("_curve")

    @property
    def key_size(self) -> int:
        return self.curve.key_size

    def signer(
        self, signature_algorithm: ec.EllipticCurveSignatureAlgorithm
    ) -> AsymmetricSignatureContext:
        _warn_sign_verify_deprecated()
        _check_signature_algorithm(signature_algorithm)
        _check_not_prehashed(signature_algorithm.algorithm)
        # This assert is to help mypy realize what type this object holds
        assert isinstance(signature_algorithm.algorithm, hashes.HashAlgorithm)
        return _ECDSASignatureContext(
            self._backend, self, signature_algorithm.algorithm
        )

    def exchange(
        self, algorithm: ec.ECDH, peer_public_key: ec.EllipticCurvePublicKey
    ) -> bytes:
        if not (
            self._backend.elliptic_curve_exchange_algorithm_supported(
                algorithm, self.curve
            )
        ):
            raise UnsupportedAlgorithm(
                "This backend does not support the ECDH algorithm.",
                _Reasons.UNSUPPORTED_EXCHANGE_ALGORITHM,
            )

        if peer_public_key.curve.name != self.curve.name:
            raise ValueError(
                "peer_public_key and self are not on the same curve"
            )

        return _evp_pkey_derive(self._backend, self._evp_pkey, peer_public_key)

    def public_key(self) -> ec.EllipticCurvePublicKey:
        group = self._backend._lib.EC_KEY_get0_group(self._ec_key)
        self._backend.openssl_assert(group != self._backend._ffi.NULL)

        curve_nid = self._backend._lib.EC_GROUP_get_curve_name(group)
        public_ec_key = self._backend._ec_key_new_by_curve_nid(curve_nid)

        point = self._backend._lib.EC_KEY_get0_public_key(self._ec_key)
        self._backend.openssl_assert(point != self._backend._ffi.NULL)

        res = self._backend._lib.EC_KEY_set_public_key(public_ec_key, point)
        self._backend.openssl_assert(res == 1)

        evp_pkey = self._backend._ec_cdata_to_evp_pkey(public_ec_key)

        return _EllipticCurvePublicKey(self._backend, public_ec_key, evp_pkey)

    def private_numbers(self) -> ec.EllipticCurvePrivateNumbers:
        bn = self._backend._lib.EC_KEY_get0_private_key(self._ec_key)
        private_value = self._backend._bn_to_int(bn)
        return ec.EllipticCurvePrivateNumbers(
            private_value=private_value,
            public_numbers=self.public_key().public_numbers(),
        )

    def private_bytes(
        self,
        encoding: serialization.Encoding,
        format: serialization.PrivateFormat,
        encryption_algorithm: serialization.KeySerializationEncryption,
    ) -> bytes:
        return self._backend._private_key_bytes(
            encoding,
            format,
            encryption_algorithm,
            self,
            self._evp_pkey,
            self._ec_key,
        )

    def sign(
        self,
        data: bytes,
        signature_algorithm: ec.EllipticCurveSignatureAlgorithm,
    ) -> bytes:
        _check_signature_algorithm(signature_algorithm)
        data, algorithm = _calculate_digest_and_algorithm(
            self._backend,
            data,
            signature_algorithm._algorithm,  # type: ignore[attr-defined]
        )
        return _ecdsa_sig_sign(self._backend, self, data)


class _EllipticCurvePublicKey(ec.EllipticCurvePublicKey):
    def __init__(self, backend, ec_key_cdata, evp_pkey):
        self._backend = backend
        self._ec_key = ec_key_cdata
        self._evp_pkey = evp_pkey

        sn = _ec_key_curve_sn(backend, ec_key_cdata)
        self._curve = _sn_to_elliptic_curve(backend, sn)
        _mark_asn1_named_ec_curve(backend, ec_key_cdata)

    curve = utils.read_only_property("_curve")

    @property
    def key_size(self) -> int:
        return self.curve.key_size

    def verifier(
        self,
        signature: bytes,
        signature_algorithm: ec.EllipticCurveSignatureAlgorithm,
    ) -> AsymmetricVerificationContext:
        _warn_sign_verify_deprecated()
        utils._check_bytes("signature", signature)

        _check_signature_algorithm(signature_algorithm)
        _check_not_prehashed(signature_algorithm.algorithm)
        # This assert is to help mypy realize what type this object holds
        assert isinstance(signature_algorithm.algorithm, hashes.HashAlgorithm)
        return _ECDSAVerificationContext(
            self._backend, self, signature, signature_algorithm.algorithm
        )

    def public_numbers(self) -> ec.EllipticCurvePublicNumbers:
        get_func, group = self._backend._ec_key_determine_group_get_func(
            self._ec_key
        )
        point = self._backend._lib.EC_KEY_get0_public_key(self._ec_key)
        self._backend.openssl_assert(point != self._backend._ffi.NULL)

        with self._backend._tmp_bn_ctx() as bn_ctx:
            bn_x = self._backend._lib.BN_CTX_get(bn_ctx)
            bn_y = self._backend._lib.BN_CTX_get(bn_ctx)

            res = get_func(group, point, bn_x, bn_y, bn_ctx)
            self._backend.openssl_assert(res == 1)

            x = self._backend._bn_to_int(bn_x)
            y = self._backend._bn_to_int(bn_y)

        return ec.EllipticCurvePublicNumbers(x=x, y=y, curve=self._curve)

    def _encode_point(self, format: serialization.PublicFormat) -> bytes:
        if format is serialization.PublicFormat.CompressedPoint:
            conversion = self._backend._lib.POINT_CONVERSION_COMPRESSED
        else:
            assert format is serialization.PublicFormat.UncompressedPoint
            conversion = self._backend._lib.POINT_CONVERSION_UNCOMPRESSED

        group = self._backend._lib.EC_KEY_get0_group(self._ec_key)
        self._backend.openssl_assert(group != self._backend._ffi.NULL)
        point = self._backend._lib.EC_KEY_get0_public_key(self._ec_key)
        self._backend.openssl_assert(point != self._backend._ffi.NULL)
        with self._backend._tmp_bn_ctx() as bn_ctx:
            buflen = self._backend._lib.EC_POINT_point2oct(
                group, point, conversion, self._backend._ffi.NULL, 0, bn_ctx
            )
            self._backend.openssl_assert(buflen > 0)
            buf = self._backend._ffi.new("char[]", buflen)
            res = self._backend._lib.EC_POINT_point2oct(
                group, point, conversion, buf, buflen, bn_ctx
            )
            self._backend.openssl_assert(buflen == res)

        return self._backend._ffi.buffer(buf)[:]

    def public_bytes(
        self,
        encoding: serialization.Encoding,
        format: serialization.PublicFormat,
    ) -> bytes:
        if (
            encoding is serialization.Encoding.X962
            or format is serialization.PublicFormat.CompressedPoint
            or format is serialization.PublicFormat.UncompressedPoint
        ):
            if encoding is not serialization.Encoding.X962 or format not in (
                serialization.PublicFormat.CompressedPoint,
                serialization.PublicFormat.UncompressedPoint,
            ):
                raise ValueError(
                    "X962 encoding must be used with CompressedPoint or "
                    "UncompressedPoint format"
                )

            return self._encode_point(format)
        else:
            return self._backend._public_key_bytes(
                encoding, format, self, self._evp_pkey, None
            )

    def verify(
        self,
        signature: bytes,
        data: bytes,
        signature_algorithm: ec.EllipticCurveSignatureAlgorithm,
    ) -> None:
        _check_signature_algorithm(signature_algorithm)
        data, algorithm = _calculate_digest_and_algorithm(
            self._backend,
            data,
            signature_algorithm._algorithm,  # type: ignore[attr-defined]
        )
        _ecdsa_sig_verify(self._backend, self, signature, data)