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key_manager: Eliminate indexed for loop

This commit is contained in:
Zach Hilman 2018-08-21 21:12:53 -04:00
parent 119ab308b5
commit ccfd176382
1 changed files with 13 additions and 6 deletions
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19
src/core/crypto/key_manager.cpp
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@ -100,14 +100,21 @@ Loader::ResultStatus DeriveSDKeys(std::array<Key256, 2>& sd_keys, const KeyManag
keys.GetKey(S256KeyType::SDKeySource, static_cast<u64>(SDKeyType::NCA)), keys.GetKey(S256KeyType::SDKeySource, static_cast<u64>(SDKeyType::NCA)),
}; };
AESCipher<Key128> cipher(sd_kek, Mode::ECB); // Combine sources and seed
for (size_t i = 0; i < 2; ++i) { for (auto& source : sd_key_sources) {
for (size_t j = 0; j < sd_key_sources[i].size(); ++j) for (size_t i = 0; i < source.size(); ++i)
sd_key_sources[i][j] ^= sd_seed[j & 0xF]; source[i] ^= sd_seed[i & 0xF];
cipher.Transcode(sd_key_sources[i].data(), sd_key_sources[i].size(), sd_keys[i].data(),
Op::Decrypt);
} }
AESCipher<Key128> cipher(sd_kek, Mode::ECB);
// The transform manipulates sd_keys as part of the Transcode, so the return/output is
// unnecessary. This does not alter sd_keys_sources.
std::transform(sd_key_sources.begin(), sd_key_sources.end(), sd_keys.begin(),
sd_key_sources.begin(), [&cipher](const Key256& source, Key256& out) {
cipher.Transcode(source.data(), source.size(), out.data(), Op::Decrypt);
return source; ///< Return unaltered source to satisfy output requirement.
});
return Loader::ResultStatus::Success; return Loader::ResultStatus::Success;
} }