introduce wrapper for SHA1 functionality

Source/Core/Common/Crypto/SHA1.cpp

@@ -0,0 +1,51 @@
+// Copyright 2017 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "SHA1.h"
+
+#include <memory>
+
+#include <mbedtls/sha1.h>
+
+#include "Common/Assert.h"
+#include "Common/CPUDetect.h"
+#include "Common/CommonTypes.h"
+
+namespace Common::SHA1
+{
+class ContextMbed final : public Context
+{
+public:
+  ContextMbed()
+  {
+    mbedtls_sha1_init(&ctx);
+    ASSERT(!mbedtls_sha1_starts_ret(&ctx));
+  }
+  ~ContextMbed() { mbedtls_sha1_free(&ctx); }
+  virtual void Update(const u8* msg, size_t len) override
+  {
+    ASSERT(!mbedtls_sha1_update_ret(&ctx, msg, len));
+  }
+  virtual Digest Finish() override
+  {
+    Digest digest;
+    ASSERT(!mbedtls_sha1_finish_ret(&ctx, digest.data()));
+    return digest;
+  }
+
+private:
+  mbedtls_sha1_context ctx{};
+};
+
+std::unique_ptr<Context> CreateContext()
+{
+  return std::make_unique<ContextMbed>();
+}
+
+Digest CalculateDigest(const u8* msg, size_t len)
+{
+  auto ctx = CreateContext();
+  ctx->Update(msg, len);
+  return ctx->Finish();
+}
+}  // namespace Common::SHA1