Refactor to share more code between OpenSSL and NSS implementations.

content/renderer/webcrypto/crypto_data.h

+// Copyright (c) 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_RENDERER_WEBCRYPTO_CRYPTO_DATA_H_
+#define CONTENT_RENDERER_WEBCRYPTO_CRYPTO_DATA_H_
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "content/common/content_export.h"
+#include "third_party/WebKit/public/platform/WebVector.h"
+
+namespace blink {
+class WebArrayBuffer;
+}
+
+namespace content {
+
+namespace webcrypto {
+
+// Helper to pass around a range of immutable bytes. This is conceptually
+// similar to base::StringPiece, but for crypto byte data.
+//
+// The data used at construction is NOT owned, and should remain valid as long
+// as the CryptoData is being used.
+class CONTENT_EXPORT CryptoData {
+ public:
+  // Constructs empty data.
+  CryptoData();
+
+  CryptoData(const unsigned char* bytes, unsigned int byte_length);
+
+  // These constructors do NOT copy the data. Hence the base pointer should
+  // remain valid for the lifetime of CryptoData.
+  explicit CryptoData(const std::vector<unsigned char>& bytes);
+  explicit CryptoData(const std::string& bytes);
+  explicit CryptoData(const blink::WebArrayBuffer& buffer);
+  explicit CryptoData(const blink::WebVector<unsigned char>& bytes);
+
+  const unsigned char* bytes() const { return bytes_; }
+  unsigned int byte_length() const { return byte_length_; }
+
+ private:
+  const unsigned char* const bytes_;
+  const unsigned int byte_length_;
+
+  DISALLOW_COPY_AND_ASSIGN(CryptoData);
+};
+
+}  // namespace webcrypto
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_WEBCRYPTO_CRYPTO_DATA_H_