File: secure_hash.h

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// Copyright 2012 The Chromium Authors
// 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 <stddef.h>

#include <memory>

#include "crypto/crypto_export.h"

namespace crypto {

// A wrapper to calculate secure hashes incrementally, allowing to
// be used when the full input is not known in advance. The end result will the
// same as if we have the full input in advance.
class CRYPTO_EXPORT SecureHash {
 public:
  enum Algorithm {
    SHA256,
    SHA512,
  };

  SecureHash(const SecureHash&) = delete;
  SecureHash& operator=(const SecureHash&) = delete;

  virtual ~SecureHash() {}

  static std::unique_ptr<SecureHash> Create(Algorithm type);

  virtual void Update(const void* input, size_t len) = 0;
  virtual void Finish(void* output, size_t len) = 0;
  virtual size_t GetHashLength() const = 0;

  // Create a clone of this SecureHash. The returned clone and this both
  // represent the same hash state. But from this point on, calling
  // Update()/Finish() on either doesn't affect the state of the other.
  virtual std::unique_ptr<SecureHash> Clone() const = 0;

 protected:
  SecureHash() {}
};

}  // namespace crypto

#endif  // CRYPTO_SECURE_HASH_H_