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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 "base/containers/span.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. The end result will the
// same as if we have the full input in advance.
//
// TODO(https://issues.chromium.org/issues/374310081): Move this into
// crypto/hash.h along with the oneshot functions.
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(base::span<const uint8_t> input) = 0;
virtual void Finish(base::span<uint8_t> output) = 0;
virtual size_t GetHashLength() const = 0;
// Deprecated non-span APIs - do not add new uses of them, and please remove
// existing uses.
// TODO(https://crbug.com/364687923): Delete these.
void Update(const void* input, size_t len);
void Finish(void* output, size_t len);
// 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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