1 files changed, 61 insertions, 0 deletions
diff --git a/lib/e2ee/qolmutility.cpp b/lib/e2ee/qolmutility.cpp
new file mode 100644
index 00000000..303f6d75
--- /dev/null
+++ b/lib/e2ee/qolmutility.cpp
@@ -0,0 +1,61 @@
+// SPDX-FileCopyrightText: 2021 Carl Schwan <carlschwan@kde.org>
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+#include "e2ee/qolmutility.h"
+#include "olm/olm.h"
+#include <QDebug>
+
+using namespace Quotient;
+
+// Convert olm error to enum
+QOlmError lastError(OlmUtility *utility) {
+    return fromString(olm_utility_last_error(utility));
+}
+
+QOlmUtility::QOlmUtility()
+{
+    auto utility = new uint8_t[olm_utility_size()];
+    m_utility = olm_utility(utility);
+}
+
+QOlmUtility::~QOlmUtility()
+{
+    olm_clear_utility(m_utility);
+    delete[](reinterpret_cast<uint8_t *>(m_utility));
+}
+
+QString QOlmUtility::sha256Bytes(const QByteArray &inputBuf) const
+{
+    const auto outputLen = olm_sha256_length(m_utility);
+    QByteArray outputBuf(outputLen, '0');
+    olm_sha256(m_utility, inputBuf.data(), inputBuf.length(),
+            outputBuf.data(), outputBuf.length());
+
+    return QString::fromUtf8(outputBuf);
+}
+
+QString QOlmUtility::sha256Utf8Msg(const QString &message) const
+{
+    return sha256Bytes(message.toUtf8());
+}
+
+std::variant<bool, QOlmError> QOlmUtility::ed25519Verify(const QByteArray &key,
+        const QByteArray &message, const QByteArray &signature)
+{
+    QByteArray signatureBuf(signature.length(), '0');
+    std::copy(signature.begin(), signature.end(), signatureBuf.begin());
+
+    const auto ret = olm_ed25519_verify(m_utility, key.data(), key.size(),
+            message.data(), message.size(), (void *)signatureBuf.data(), signatureBuf.size());
+
+    const auto error = ret;
+    if (error == olm_error()) {
+        return lastError(m_utility);
+    }
+
+    if (ret != 0) {
+        return false;
+    }
+    return true;
+}