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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CRYPTO_SECURE_HASH_H_
      6 #define CRYPTO_SECURE_HASH_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "crypto/crypto_export.h"
     10 
     11 class Pickle;
     12 class PickleIterator;
     13 
     14 namespace crypto {
     15 
     16 // A wrapper to calculate secure hashes incrementally, allowing to
     17 // be used when the full input is not known in advance.
     18 class CRYPTO_EXPORT SecureHash {
     19  public:
     20   enum Algorithm {
     21     SHA256,
     22   };
     23   virtual ~SecureHash() {}
     24 
     25   static SecureHash* Create(Algorithm type);
     26 
     27   virtual void Update(const void* input, size_t len) = 0;
     28   virtual void Finish(void* output, size_t len) = 0;
     29 
     30   // Serialize the context, so it can be restored at a later time.
     31   // |pickle| will contain the serialized data.
     32   // Returns whether or not |pickle| was filled.
     33   virtual bool Serialize(Pickle* pickle) = 0;
     34 
     35   // Restore the context that was saved earlier.
     36   // |data_iterator| allows this to be used as part of a larger pickle.
     37   // |pickle| holds the saved data.
     38   // Returns success or failure.
     39   virtual bool Deserialize(PickleIterator* data_iterator) = 0;
     40 
     41  protected:
     42   SecureHash() {}
     43 
     44  private:
     45   DISALLOW_COPY_AND_ASSIGN(SecureHash);
     46 };
     47 
     48 }  // namespace crypto
     49 
     50 #endif  // CRYPTO_SECURE_HASH_H_
     51