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// 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 <stddef.h>
#include "base/macros.h"
#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.
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;
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 SecureHash* Clone() const = 0;
protected:
SecureHash() {}
private:
DISALLOW_COPY_AND_ASSIGN(SecureHash);
};
} // namespace crypto
#endif // CRYPTO_SECURE_HASH_H_
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