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 namespace base {
  12 class Pickle;
  13 class PickleIterator;
  14 }
  15
  16 namespace crypto {
  17
  18 // A wrapper to calculate secure hashes incrementally, allowing to
  19 // be used when the full input is not known in advance.
  20 class CRYPTO_EXPORT SecureHash {
  21  public:
  22   enum Algorithm {
  23     SHA256,
  24   };
  25   virtual ~SecureHash() {}
  26
  27   static SecureHash* Create(Algorithm type);
  28
  29   virtual void Update(const void* input, size_t len) = 0;
  30   virtual void Finish(void* output, size_t len) = 0;
  31
  32   // Serialize the context, so it can be restored at a later time.
  33   // |pickle| will contain the serialized data.
  34   // Returns whether or not |pickle| was filled.
  35   virtual bool Serialize(base::Pickle* pickle) = 0;
  36
  37   // Restore the context that was saved earlier.
  38   // |data_iterator| allows this to be used as part of a larger pickle.
  39   // |pickle| holds the saved data.
  40   // Returns success or failure.
  41   virtual bool Deserialize(base::PickleIterator* data_iterator) = 0;
  42
  43  protected:
  44   SecureHash() {}
  45
  46  private:
  47   DISALLOW_COPY_AND_ASSIGN(SecureHash);
  48 };
  49
  50 }  // namespace crypto
  51
  52 #endif  // CRYPTO_SECURE_HASH_H_