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// Copyright 2020 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include "pw_kvs/checksum.h"
#include <cstring>
namespace pw::kvs {
using std::byte;
Status ChecksumAlgorithm::Verify(span<const byte> checksum) const {
if (checksum.size() < size_bytes()) {
return Status::InvalidArgument();
}
if (state_.empty()) {
// Special case: state_.data is a nullptr, so calling std::memcmp would be
// undefined behavior.
return OkStatus();
}
if (std::memcmp(state_.data(), checksum.data(), size_bytes()) != 0) {
return Status::DataLoss();
}
return OkStatus();
}
} // namespace pw::kvs
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