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https://github.com/skyline-emu/skyline.git
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Add endiannes swapping helper functions
Avoid using compiler functions manually to create a cleaner interface, and allow swapping the endianness of arbritary lengths.
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def9f96b02
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@ -311,6 +311,24 @@ namespace skyline {
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return result >> (offset + 4);
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}
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template<size_t N>
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constexpr std::array<u8, N> SwapEndianness(std::array<u8, N> in) {
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std::reverse(in.begin(), in.end());
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return in;
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}
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constexpr u64 SwapEndianness(u64 in) {
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return __builtin_bswap64(in);
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}
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constexpr u32 SwapEndianness(u32 in) {
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return __builtin_bswap32(in);
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}
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constexpr u16 SwapEndianness(u16 in) {
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return __builtin_bswap16(in);
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}
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/**
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* @brief A compile-time hash function as std::hash isn't constexpr
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*/
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@ -21,7 +21,7 @@ namespace skyline::crypto {
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*/
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static std::array<u8, 0x10> GetTweak(size_t sector) {
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std::array<u8, 0x10> tweak{};
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size_t le{__builtin_bswap64(sector)};
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size_t le{util::SwapEndianness(sector)};
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std::memcpy(tweak.data() + 8, &le, 8);
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return tweak;
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}
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@ -13,7 +13,7 @@ namespace skyline::vfs {
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void CtrEncryptedBacking::UpdateCtr(u64 offset) {
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offset >>= 4;
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size_t le{__builtin_bswap64(offset)};
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size_t le{util::SwapEndianness(offset)};
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std::memcpy(ctr.data() + 8, &le, 8);
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cipher.SetIV(ctr);
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}
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@ -81,8 +81,8 @@ namespace skyline::vfs {
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auto key{!(rightsIdEmpty || useKeyArea) ? GetTitleKey() : GetKeyAreaKey(sectionHeader.encryptionType)};
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std::array<u8, 0x10> ctr{};
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u32 secureValueLE{__builtin_bswap32(sectionHeader.secureValue)};
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u32 generationLE{__builtin_bswap32(sectionHeader.generation)};
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u32 secureValueLE{util::SwapEndianness(sectionHeader.secureValue)};
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u32 generationLE{util::SwapEndianness(sectionHeader.generation)};
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std::memcpy(ctr.data(), &secureValueLE, 4);
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std::memcpy(ctr.data() + 4, &generationLE, 4);
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