35 lines
1.3 KiB
C++
35 lines
1.3 KiB
C++
#include <cpp-utils/data/SerializationHelper.h>
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#include "RandomPadding.h"
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#include "../logging/logging.h"
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#include "../random/Random.h"
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using boost::optional;
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using namespace cpputils::logging;
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namespace cpputils {
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Data RandomPadding::add(const Data &data, size_t targetSize) {
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uint32_t size = data.size();
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if (size >= targetSize - sizeof(size)) {
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throw std::runtime_error("Data too large. We should increase padding target size.");
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}
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Data randomData = Random::PseudoRandom().get(targetSize-sizeof(size)-size);
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ASSERT(sizeof(size) + size + randomData.size() == targetSize, "Calculated size of randomData incorrectly");
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Data result(targetSize);
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serialize<uint32_t>(result.data(), size);
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std::memcpy(result.dataOffset(sizeof(size)), data.data(), size);
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std::memcpy(result.dataOffset(sizeof(size)+size), randomData.data(), randomData.size());
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return result;
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}
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optional<Data> RandomPadding::remove(const Data &data) {
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uint32_t size = deserialize<uint32_t>(data.data());
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if(sizeof(size) + size >= data.size()) {
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LOG(ERR, "Config file is invalid: Invalid padding.");
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return boost::none;
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};
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Data result(size);
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std::memcpy(result.data(), data.dataOffset(sizeof(size)), size);
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return result;
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}
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}
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