// SPDX-FileCopyrightText: 2021 Carl Schwan <carlschwan@kde.org>
//
// SPDX-License-Identifier: LGPL-2.1-or-later

#pragma once

#include <variant>
#include "e2ee/qolmerrors.h"

struct OlmUtility;

namespace Quotient {

class QOlmSession;

//! Allows you to make use of crytographic hashing via SHA-2 and
//! verifying ed25519 signatures.
class QUOTIENT_API QOlmUtility
{
public:
    QOlmUtility();
    ~QOlmUtility();

    //! Returns a sha256 of the supplied byte slice.
    QString sha256Bytes(const QByteArray &inputBuf) const;

    //! Convenience function that converts the UTF-8 message
    //! to bytes and then calls `sha256Bytes()`, returning its output.
    QString sha256Utf8Msg(const QString &message) const;

    //! Verify a ed25519 signature.
    //! \param key QByteArray The public part of the ed25519 key that signed the message.
    //! \param message QByteArray The message that was signed.
    //! \param signature QByteArray The signature of the message.
    std::variant<bool, QOlmError> ed25519Verify(const QByteArray &key,
            const QByteArray &message, const QByteArray &signature);

private:
    OlmUtility *m_utility;

};
}