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49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
// Copyright 2012 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CRYPTO_SECURE_HASH_H_
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#define CRYPTO_SECURE_HASH_H_
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#include <stddef.h>
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#include <memory>
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#include "crypto/crypto_export.h"
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namespace crypto {
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// A wrapper to calculate secure hashes incrementally, allowing to
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// be used when the full input is not known in advance. The end result will the
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// same as if we have the full input in advance.
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class CRYPTO_EXPORT SecureHash {
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public:
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enum Algorithm {
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SHA256,
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SHA512,
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};
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SecureHash(const SecureHash&) = delete;
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SecureHash& operator=(const SecureHash&) = delete;
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virtual ~SecureHash() {}
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static std::unique_ptr<SecureHash> Create(Algorithm type);
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virtual void Update(const void* input, size_t len) = 0;
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virtual void Finish(void* output, size_t len) = 0;
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virtual size_t GetHashLength() const = 0;
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// Create a clone of this SecureHash. The returned clone and this both
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// represent the same hash state. But from this point on, calling
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// Update()/Finish() on either doesn't affect the state of the other.
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virtual std::unique_ptr<SecureHash> Clone() const = 0;
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protected:
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SecureHash() {}
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};
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} // namespace crypto
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#endif // CRYPTO_SECURE_HASH_H_
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