functions/source/KeyGen/cryptography/hazmat/backends/openssl/x25519.py [102:135]:
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        return _evp_pkey_derive(
            self._backend, self._evp_pkey, peer_public_key
        )

    def private_bytes(self, encoding, format, encryption_algorithm):
        if (
            encoding is serialization.Encoding.Raw or
            format is serialization.PublicFormat.Raw
        ):
            if (
                format is not serialization.PrivateFormat.Raw or
                encoding is not serialization.Encoding.Raw or not
                isinstance(encryption_algorithm, serialization.NoEncryption)
            ):
                raise ValueError(
                    "When using Raw both encoding and format must be Raw "
                    "and encryption_algorithm must be NoEncryption"
                )

            return self._raw_private_bytes()

        if (
            encoding in serialization._PEM_DER and
            format is not serialization.PrivateFormat.PKCS8
        ):
            raise ValueError(
                "format must be PKCS8 when encoding is PEM or DER"
            )

        return self._backend._private_key_bytes(
            encoding, format, encryption_algorithm, self._evp_pkey, None
        )

    def _raw_private_bytes(self):
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functions/source/KeyGen/cryptography/hazmat/backends/openssl/x448.py [82:115]:
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        return _evp_pkey_derive(
            self._backend, self._evp_pkey, peer_public_key
        )

    def private_bytes(self, encoding, format, encryption_algorithm):
        if (
            encoding is serialization.Encoding.Raw or
            format is serialization.PublicFormat.Raw
        ):
            if (
                format is not serialization.PrivateFormat.Raw or
                encoding is not serialization.Encoding.Raw or not
                isinstance(encryption_algorithm, serialization.NoEncryption)
            ):
                raise ValueError(
                    "When using Raw both encoding and format must be Raw "
                    "and encryption_algorithm must be NoEncryption"
                )

            return self._raw_private_bytes()

        if (
            encoding in serialization._PEM_DER and
            format is not serialization.PrivateFormat.PKCS8
        ):
            raise ValueError(
                "format must be PKCS8 when encoding is PEM or DER"
            )

        return self._backend._private_key_bytes(
            encoding, format, encryption_algorithm, self._evp_pkey, None
        )

    def _raw_private_bytes(self):
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