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// Copyright 2019 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 UTIL_CRYPTO_SECURE_HASH_H_
#define UTIL_CRYPTO_SECURE_HASH_H_
#include <stddef.h>
#include <memory>
#include <string>
#include "openssl/base.h"
#include "openssl/evp.h"
#include "platform/base/macros.h"
namespace openscreen {
// 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 SecureHash {
public:
SecureHash(const EVP_MD* type);
SecureHash(const SecureHash& other);
SecureHash(SecureHash&& other);
SecureHash& operator=(const SecureHash& other);
SecureHash& operator=(SecureHash&& other);
~SecureHash();
void Update(const uint8_t* input, size_t len);
void Finish(uint8_t* output);
// Handy versions that do the kludgy casting to unsigned in the background.
void Update(const std::string& input);
void Finish(char* output);
size_t GetHashLength() const;
private:
bssl::UniquePtr<EVP_MD_CTX> ctx_ =
bssl::UniquePtr<EVP_MD_CTX>(EVP_MD_CTX_new());
};
} // namespace openscreen
#endif // UTIL_CRYPTO_SECURE_HASH_H_
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