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key_manager: Eliminate indexed for loop
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@ -100,14 +100,21 @@ Loader::ResultStatus DeriveSDKeys(std::array<Key256, 2>& sd_keys, const KeyManag
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keys.GetKey(S256KeyType::SDKeySource, static_cast<u64>(SDKeyType::NCA)),
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};
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AESCipher<Key128> cipher(sd_kek, Mode::ECB);
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for (size_t i = 0; i < 2; ++i) {
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for (size_t j = 0; j < sd_key_sources[i].size(); ++j)
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sd_key_sources[i][j] ^= sd_seed[j & 0xF];
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cipher.Transcode(sd_key_sources[i].data(), sd_key_sources[i].size(), sd_keys[i].data(),
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Op::Decrypt);
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// Combine sources and seed
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for (auto& source : sd_key_sources) {
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for (size_t i = 0; i < source.size(); ++i)
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source[i] ^= sd_seed[i & 0xF];
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}
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AESCipher<Key128> cipher(sd_kek, Mode::ECB);
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// The transform manipulates sd_keys as part of the Transcode, so the return/output is
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// unnecessary. This does not alter sd_keys_sources.
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std::transform(sd_key_sources.begin(), sd_key_sources.end(), sd_keys.begin(),
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sd_key_sources.begin(), [&cipher](const Key256& source, Key256& out) {
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cipher.Transcode(source.data(), source.size(), out.data(), Op::Decrypt);
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return source; ///< Return unaltered source to satisfy output requirement.
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});
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return Loader::ResultStatus::Success;
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}
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