crypto/secure_hash.h

   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_