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diff --git a/include/olm/utility.hh b/include/olm/utility.hh
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+/* Copyright 2015 OpenMarket Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef UTILITY_HH_
+#define UTILITY_HH_
+
+#include "olm/error.hh"
+
+#include <cstddef>
+#include <cstdint>
+
+namespace olm {
+
+class Ed25519PublicKey;
+
+struct Utility {
+
+    Utility();
+
+    ErrorCode last_error;
+
+    std::size_t sha256_length();
+
+    std::size_t sha256(
+        std::uint8_t const * input, std::size_t input_length,
+        std::uint8_t * output, std::size_t output_length
+    );
+
+    std::size_t ed25519_verify(
+        Ed25519PublicKey const & key,
+        std::uint8_t const * message, std::size_t message_length,
+        std::uint8_t const * signature, std::size_t signature_length
+    );
+
+};
+
+
+} // namespace olm
+
+#endif /* UTILITY_HH_ */