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58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_SECURE_HASH_H_
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#define THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_SECURE_HASH_H_
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#include <stddef.h>
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#include <memory>
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#include "internal/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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};
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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 // THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_SECURE_HASH_H_
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