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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 <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_
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