forked from moonpower/azahar-UWP
dc1ebb63cb
- Allow downloading titles from eshop and system settings - Remove encrypted game support
57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
// Copyright 2024 Azahar Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <cryptopp/aes.h>
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#include <cryptopp/modes.h>
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#include <cryptopp/sha.h>
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#include "common/file_util.h"
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#include "common/logging/log.h"
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#include "core/file_sys/otp.h"
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#include "core/loader/loader.h"
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namespace FileSys {
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Loader::ResultStatus OTP::Load(const std::string& file_path, std::span<const u8> key,
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std::span<const u8> iv) {
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FileUtil::IOFile file(file_path, "rb");
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if (!file.IsOpen())
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return Loader::ResultStatus::ErrorNotFound;
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if (file.GetSize() != sizeof(OTPBin)) {
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LOG_ERROR(HW_AES, "Invalid OTP size");
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return Loader::ResultStatus::Error;
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}
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OTPBin temp_otp;
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if (file.ReadBytes(&temp_otp, sizeof(OTPBin)) != sizeof(OTPBin)) {
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return Loader::ResultStatus::Error;
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}
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// OTP is probably encrypted, decrypt it.
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if (temp_otp.body.magic != otp_magic) {
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CryptoPP::CBC_Mode<CryptoPP::AES>::Decryption d;
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d.SetKeyWithIV(key.data(), key.size(), iv.data());
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d.ProcessData(reinterpret_cast<u8*>(&temp_otp), reinterpret_cast<u8*>(&temp_otp),
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sizeof(temp_otp));
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if (temp_otp.body.magic != otp_magic) {
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LOG_ERROR(HW_AES, "OTP failed to decrypt (or uses dev keys)");
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return Loader::ResultStatus::Error;
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}
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}
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// Verify OTP hash
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CryptoPP::SHA256 hash;
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std::array<u8, CryptoPP::SHA256::DIGESTSIZE> digest;
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hash.CalculateDigest(digest.data(), reinterpret_cast<u8*>(&temp_otp.body),
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sizeof(temp_otp.body));
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if (temp_otp.hash != digest) {
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LOG_ERROR(HW_AES, "OTP is corrupted");
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return Loader::ResultStatus::Error;
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}
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otp = temp_otp;
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return Loader::ResultStatus::Success;
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}
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} // namespace FileSys
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