1 files changed, 42 insertions, 0 deletions
diff --git a/lib/e2ee/qolmutility.h b/lib/e2ee/qolmutility.h
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+++ b/lib/e2ee/qolmutility.h
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+// 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;
+
+};
+}