Update monet.

crypto/secure_hash.h

+// Copyright (c) 2012 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 CRYPTO_SECURE_HASH_H_
+#define CRYPTO_SECURE_HASH_H_
+
+#include "base/basictypes.h"
+#include "crypto/crypto_export.h"
+
+namespace base {
+class Pickle;
+class PickleIterator;
+}
+
+namespace crypto {
+
+// A wrapper to calculate secure hashes incrementally, allowing to
+// be used when the full input is not known in advance.
+class CRYPTO_EXPORT SecureHash {
+ public:
+  enum Algorithm {
+    SHA256,
+  };
+  virtual ~SecureHash() {}
+
+  static SecureHash* Create(Algorithm type);
+
+  virtual void Update(const void* input, size_t len) = 0;
+  virtual void Finish(void* output, size_t len) = 0;
+
+  // Serialize the context, so it can be restored at a later time.
+  // |pickle| will contain the serialized data.
+  // Returns whether or not |pickle| was filled.
+  virtual bool Serialize(base::Pickle* pickle) = 0;
+
+  // Restore the context that was saved earlier.
+  // |data_iterator| allows this to be used as part of a larger pickle.
+  // |pickle| holds the saved data.
+  // Returns success or failure.
+  virtual bool Deserialize(base::PickleIterator* data_iterator) = 0;
+
+ protected:
+  SecureHash() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SecureHash);
+};
+
+}  // namespace crypto
+
+#endif  // CRYPTO_SECURE_HASH_H_