1 files changed, 40 insertions, 0 deletions
diff --git a/src/buildtool/crypto/hash_impl.hpp b/src/buildtool/crypto/hash_impl.hpp
new file mode 100644
index 00000000..aa5a9559
--- /dev/null
+++ b/src/buildtool/crypto/hash_impl.hpp
@@ -0,0 +1,40 @@
+#ifndef INCLUDED_SRC_BUILDTOOL_CRYPTO_HASH_IMPL_HPP
+#define INCLUDED_SRC_BUILDTOOL_CRYPTO_HASH_IMPL_HPP
+
+#include <optional>
+#include <string>
+
+#include "src/buildtool/logging/logger.hpp"
+
+/// \brief Interface for hash implementations
+class IHashImpl {
+  public:
+    IHashImpl() noexcept = default;
+    IHashImpl(IHashImpl const&) = default;
+    IHashImpl(IHashImpl&&) = default;
+    auto operator=(IHashImpl const&) -> IHashImpl& = default;
+    auto operator=(IHashImpl &&) -> IHashImpl& = default;
+    virtual ~IHashImpl() = default;
+
+    /// \brief Feed data to the incremental hashing.
+    [[nodiscard]] virtual auto Update(std::string const& data) noexcept
+        -> bool = 0;
+
+    /// \brief Finalize the hashing and return hash as string of raw bytes.
+    [[nodiscard]] virtual auto Finalize() && noexcept
+        -> std::optional<std::string> = 0;
+
+    /// \brief Compute the hash of data and return it as string of raw bytes.
+    [[nodiscard]] virtual auto Compute(std::string const& data) && noexcept
+        -> std::string = 0;
+
+    /// \brief Get length of the hash in raw bytes.
+    [[nodiscard]] virtual auto DigestLength() const noexcept -> std::size_t = 0;
+
+    static auto FatalError() noexcept -> void {
+        Logger::Log(LogLevel::Error, "Failed to compute hash.");
+        std::terminate();
+    }
+};
+
+#endif  // INCLUDED_SRC_BUILDTOOL_CRYPTO_HASH_IMPL_HPP