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NANDImporter: Only read the AES key once

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There is no need to constantly reset the key for every file entry.
This commit is contained in:
Starsam80
2021-12-29 21:03:50 -07:00
parent 80012ae253
commit 41a3368889
2 changed files with 8 additions and 8 deletions
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14
Source/Core/DiscIO/NANDImporter.cpp
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@ -4,7 +4,6 @@
#include "DiscIO/NANDImporter.h"
#include <algorithm>
#include <array>
#include <cstring>
#include "Common/Crypto/AES.h"
@ -35,8 +34,8 @@ void NANDImporter::ImportNANDBin(const std::string& path_to_bin,
if (!FindSuperblock())
return;
ProcessEntry(0, "");
ExportKeys();
ProcessEntry(0, "");
ExtractCertificates();
}
@ -165,13 +164,8 @@ void NANDImporter::ProcessEntry(u16 entry_number, const std::string& parent_path
std::vector<u8> NANDImporter::GetEntryData(const NANDFSTEntry& entry)
{
constexpr size_t NAND_AES_KEY_OFFSET = 0x158;
constexpr size_t NAND_FAT_BLOCK_SIZE = 0x4000;
std::array<u8, 16> key{};
std::copy(&m_nand_keys[NAND_AES_KEY_OFFSET], &m_nand_keys[NAND_AES_KEY_OFFSET + key.size()],
key.begin());
u16 sub = entry.sub;
size_t remaining_bytes = entry.size;
std::vector<u8> data{};
@ -181,7 +175,7 @@ std::vector<u8> NANDImporter::GetEntryData(const NANDFSTEntry& entry)
{
std::array<u8, 16> iv{};
std::vector<u8> block = Common::AES::Decrypt(
key.data(), iv.data(), &m_nand[NAND_FAT_BLOCK_SIZE * sub], NAND_FAT_BLOCK_SIZE);
m_aes_key.data(), iv.data(), &m_nand[NAND_FAT_BLOCK_SIZE * sub], NAND_FAT_BLOCK_SIZE);
size_t size = std::min(remaining_bytes, block.size());
data.insert(data.end(), block.begin(), block.begin() + size);
@ -264,6 +258,10 @@ bool NANDImporter::ExtractCertificates()
void NANDImporter::ExportKeys()
{
constexpr size_t NAND_AES_KEY_OFFSET = 0x158;
std::copy_n(&m_nand_keys[NAND_AES_KEY_OFFSET], m_aes_key.size(), m_aes_key.begin());
const std::string file_path = m_nand_root + "/keys.bin";
File::IOFile file(file_path, "wb");
if (!file.WriteBytes(m_nand_keys.data(), NAND_KEYS_SIZE))