mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-12-24 00:13:05 +00:00
569 lines
No EOL
19 KiB
C++
569 lines
No EOL
19 KiB
C++
/*
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* Copyright (c) 2018-2019 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <switch.h>
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#include <stratosphere.hpp>
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#include "spl_secmon_wrapper.hpp"
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#include "spl_smc_wrapper.hpp"
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#include "spl_ctr_drbg.hpp"
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/* Convenient. */
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constexpr size_t DeviceAddressSpaceAlignSize = 0x400000;
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constexpr size_t DeviceAddressSpaceAlignMask = DeviceAddressSpaceAlignSize - 1;
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constexpr u32 WorkBufferMapBase = 0x80000000u;
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constexpr u32 CryptAesInMapBase = 0x90000000u;
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constexpr u32 CryptAesOutMapBase = 0xC0000000u;
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constexpr size_t CryptAesSizeMax = static_cast<size_t>(CryptAesOutMapBase - CryptAesInMapBase);
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constexpr size_t RsaPrivateKeySize = 0x100;
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constexpr size_t RsaPrivateKeyMetaSize = 0x30;
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/* Types. */
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struct SeLinkedListEntry {
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u32 num_entries;
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u32 address;
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u32 size;
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};
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struct SeCryptContext {
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SeLinkedListEntry in;
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SeLinkedListEntry out;
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};
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class DeviceAddressSpaceMapHelper {
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private:
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Handle das_hnd;
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u64 dst_addr;
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u64 src_addr;
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size_t size;
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u32 perm;
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public:
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DeviceAddressSpaceMapHelper(Handle h, u64 dst, u64 src, size_t sz, u32 p) : das_hnd(h), dst_addr(dst), src_addr(src), size(sz), perm(p) {
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if (R_FAILED(svcMapDeviceAddressSpaceAligned(this->das_hnd, CUR_PROCESS_HANDLE, this->src_addr, this->size, this->dst_addr, this->perm))) {
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std::abort();
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}
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}
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~DeviceAddressSpaceMapHelper() {
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if (R_FAILED(svcUnmapDeviceAddressSpace(this->das_hnd, CUR_PROCESS_HANDLE, this->src_addr, this->size, this->dst_addr))) {
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std::abort();
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}
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}
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};
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/* Globals. */
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static CtrDrbg g_drbg;
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static Event g_se_event;
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static IEvent *g_se_keyslot_available_event = nullptr;
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static Handle g_se_das_hnd;
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static u32 g_se_mapped_work_buffer_addr;
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static __attribute__((aligned(0x1000))) u8 g_work_buffer[0x1000];
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constexpr size_t MaxWorkBufferSize = sizeof(g_work_buffer) / 2;
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static HosMutex g_async_op_lock;
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void SecureMonitorWrapper::InitializeCtrDrbg() {
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u8 seed[CtrDrbg::SeedSize];
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if (SmcWrapper::GenerateRandomBytes(seed, sizeof(seed)) != SmcResult_Success) {
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std::abort();
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}
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g_drbg.Initialize(seed);
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}
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void SecureMonitorWrapper::InitializeSeEvents() {
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u64 irq_num;
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SmcWrapper::GetConfig(&irq_num, 1, SplConfigItem_SecurityEngineIrqNumber);
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Handle hnd;
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if (R_FAILED(svcCreateInterruptEvent(&hnd, irq_num, 1))) {
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std::abort();
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}
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eventLoadRemote(&g_se_event, hnd, true);
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g_se_keyslot_available_event = CreateWriteOnlySystemEvent();
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g_se_keyslot_available_event->Signal();
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}
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void SecureMonitorWrapper::InitializeDeviceAddressSpace() {
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constexpr u64 DeviceName_SE = 29;
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/* Create Address Space. */
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if (R_FAILED(svcCreateDeviceAddressSpace(&g_se_das_hnd, 0, (1ul << 32)))) {
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std::abort();
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}
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/* Attach it to the SE. */
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if (R_FAILED(svcAttachDeviceAddressSpace(DeviceName_SE, g_se_das_hnd))) {
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std::abort();
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}
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const u64 work_buffer_addr = reinterpret_cast<u64>(g_work_buffer);
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g_se_mapped_work_buffer_addr = WorkBufferMapBase + (work_buffer_addr & DeviceAddressSpaceAlignMask);
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/* Map the work buffer for the SE. */
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if (R_FAILED(svcMapDeviceAddressSpaceAligned(g_se_das_hnd, CUR_PROCESS_HANDLE, work_buffer_addr, sizeof(g_work_buffer), g_se_mapped_work_buffer_addr, 3))) {
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std::abort();
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}
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}
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void SecureMonitorWrapper::Initialize() {
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/* Initialize the Drbg. */
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InitializeCtrDrbg();
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/* Initialize SE interrupt + keyslot events. */
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InitializeSeEvents();
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/* Initialize DAS for the SE. */
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InitializeDeviceAddressSpace();
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}
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void SecureMonitorWrapper::WaitSeOperationComplete() {
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eventWait(&g_se_event, U64_MAX);
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}
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Result SecureMonitorWrapper::ConvertToSplResult(SmcResult result) {
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if (result == SmcResult_Success) {
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return ResultSuccess;
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}
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if (result < SmcResult_Max) {
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return MAKERESULT(Module_Spl, static_cast<u32>(result));
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}
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return ResultSplUnknownSmcResult;
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}
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SmcResult SecureMonitorWrapper::WaitCheckStatus(AsyncOperationKey op_key) {
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WaitSeOperationComplete();
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SmcResult op_res;
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SmcResult res = SmcWrapper::CheckStatus(&op_res, op_key);
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if (res != SmcResult_Success) {
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return res;
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}
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return op_res;
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}
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SmcResult SecureMonitorWrapper::WaitGetResult(void *out_buf, size_t out_buf_size, AsyncOperationKey op_key) {
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WaitSeOperationComplete();
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SmcResult op_res;
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SmcResult res = SmcWrapper::GetResult(&op_res, out_buf, out_buf_size, op_key);
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if (res != SmcResult_Success) {
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return res;
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}
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return op_res;
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}
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SmcResult SecureMonitorWrapper::DecryptAesBlock(u32 keyslot, void *dst, const void *src) {
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struct DecryptAesBlockLayout {
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SeCryptContext crypt_ctx;
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u8 in_block[AES_BLOCK_SIZE] __attribute__((aligned(AES_BLOCK_SIZE)));
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u8 out_block[AES_BLOCK_SIZE] __attribute__((aligned(AES_BLOCK_SIZE)));
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};
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DecryptAesBlockLayout *layout = reinterpret_cast<DecryptAesBlockLayout *>(g_work_buffer);
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layout->crypt_ctx.in.num_entries = 0;
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layout->crypt_ctx.in.address = g_se_mapped_work_buffer_addr + offsetof(DecryptAesBlockLayout, in_block);
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layout->crypt_ctx.in.size = sizeof(layout->in_block);
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layout->crypt_ctx.out.num_entries = 0;
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layout->crypt_ctx.out.address = g_se_mapped_work_buffer_addr + offsetof(DecryptAesBlockLayout, out_block);
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layout->crypt_ctx.out.size = sizeof(layout->out_block);
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std::memcpy(layout->in_block, src, sizeof(layout->in_block));
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armDCacheFlush(layout, sizeof(*layout));
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{
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std::scoped_lock<HosMutex> lk(g_async_op_lock);
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AsyncOperationKey op_key;
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const IvCtr iv_ctr = {};
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const u32 mode = SmcWrapper::GetCryptAesMode(SmcCipherMode_CbcDecrypt, keyslot);
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const u32 dst_ll_addr = g_se_mapped_work_buffer_addr + offsetof(DecryptAesBlockLayout, crypt_ctx.out);
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const u32 src_ll_addr = g_se_mapped_work_buffer_addr + offsetof(DecryptAesBlockLayout, crypt_ctx.in);
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SmcResult res = SmcWrapper::CryptAes(&op_key, mode, iv_ctr, dst_ll_addr, src_ll_addr, sizeof(layout->in_block));
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if (res != SmcResult_Success) {
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return res;
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}
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if ((res = WaitCheckStatus(op_key)) != SmcResult_Success) {
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return res;
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}
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}
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armDCacheFlush(layout, sizeof(*layout));
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std::memcpy(dst, layout->out_block, sizeof(layout->out_block));
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return SmcResult_Success;
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}
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Result SecureMonitorWrapper::GetConfig(u64 *out, SplConfigItem which) {
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/* Nintendo explicitly blacklists package2 hash here, amusingly. */
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/* This is not blacklisted in safemode, but we're never in safe mode... */
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if (which == SplConfigItem_Package2Hash) {
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return ResultSplInvalidArgument;
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}
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SmcResult res = SmcWrapper::GetConfig(out, 1, which);
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/* Nintendo has some special handling here for hardware type/is_retail. */
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if (which == SplConfigItem_HardwareType && res == SmcResult_InvalidArgument) {
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*out = 0;
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res = SmcResult_Success;
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}
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if (which == SplConfigItem_IsRetail && res == SmcResult_InvalidArgument) {
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*out = 0;
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res = SmcResult_Success;
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}
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return ConvertToSplResult(res);
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}
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Result SecureMonitorWrapper::ExpMod(void *out, size_t out_size, const void *base, size_t base_size, const void *exp, size_t exp_size, const void *mod, size_t mod_size) {
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struct ExpModLayout {
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u8 base[0x100];
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u8 exp[0x100];
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u8 mod[0x100];
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};
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ExpModLayout *layout = reinterpret_cast<ExpModLayout *>(g_work_buffer);
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/* Validate sizes. */
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if (base_size > sizeof(layout->base)) {
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return ResultSplInvalidSize;
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}
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if (exp_size > sizeof(layout->exp)) {
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return ResultSplInvalidSize;
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}
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if (mod_size > sizeof(layout->mod)) {
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return ResultSplInvalidSize;
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}
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if (out_size > MaxWorkBufferSize) {
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return ResultSplInvalidSize;
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}
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/* Copy data into work buffer. */
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const size_t base_ofs = sizeof(layout->base) - base_size;
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const size_t mod_ofs = sizeof(layout->mod) - mod_size;
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std::memset(layout, 0, sizeof(*layout));
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std::memcpy(layout->base + base_ofs, base, base_size);
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std::memcpy(layout->exp, exp, exp_size);
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std::memcpy(layout->mod + mod_ofs, mod, mod_size);
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/* Do exp mod operation. */
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armDCacheFlush(layout, sizeof(*layout));
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{
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std::scoped_lock<HosMutex> lk(g_async_op_lock);
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AsyncOperationKey op_key;
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SmcResult res = SmcWrapper::ExpMod(&op_key, layout->base, layout->exp, exp_size, layout->mod);
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if (res != SmcResult_Success) {
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return ConvertToSplResult(res);
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}
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if ((res = WaitGetResult(g_work_buffer, out_size, op_key)) != SmcResult_Success) {
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return ConvertToSplResult(res);
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}
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}
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armDCacheFlush(g_work_buffer, sizeof(out_size));
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std::memcpy(out, g_work_buffer, out_size);
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return ResultSuccess;
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}
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Result SecureMonitorWrapper::SetConfig(SplConfigItem which, u64 value) {
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return ConvertToSplResult(SmcWrapper::SetConfig(which, &value, 1));
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}
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Result SecureMonitorWrapper::GenerateRandomBytesInternal(void *out, size_t size) {
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if (!g_drbg.GenerateRandomBytes(out, size)) {
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/* We need to reseed. */
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{
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u8 seed[CtrDrbg::SeedSize];
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SmcResult res = SmcWrapper::GenerateRandomBytes(seed, sizeof(seed));
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if (res != SmcResult_Success) {
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return ConvertToSplResult(res);
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}
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g_drbg.Reseed(seed);
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g_drbg.GenerateRandomBytes(out, size);
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}
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}
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return ResultSuccess;
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}
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Result SecureMonitorWrapper::GenerateRandomBytes(void *out, size_t size) {
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u8 *cur_dst = reinterpret_cast<u8 *>(out);
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for (size_t ofs = 0; ofs < size; ofs += CtrDrbg::MaxRequestSize) {
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const size_t cur_size = std::min(size - ofs, CtrDrbg::MaxRequestSize);
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Result rc = GenerateRandomBytesInternal(cur_dst, size);
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if (R_FAILED(rc)) {
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return rc;
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}
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cur_dst += cur_size;
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}
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return ResultSuccess;
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}
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Result SecureMonitorWrapper::IsDevelopment(bool *out) {
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u64 is_retail;
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Result rc = this->GetConfig(&is_retail, SplConfigItem_IsRetail);
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if (R_FAILED(rc)) {
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return rc;
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}
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*out = (is_retail == 0);
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return ResultSuccess;
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}
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Result SecureMonitorWrapper::SetBootReason(BootReasonValue boot_reason) {
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if (this->IsBootReasonSet()) {
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return ResultSplBootReasonAlreadySet;
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}
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this->boot_reason = boot_reason;
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this->boot_reason_set = true;
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return ResultSuccess;
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}
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Result SecureMonitorWrapper::GetBootReason(BootReasonValue *out) {
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if (!this->IsBootReasonSet()) {
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return ResultSplBootReasonNotSet;
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}
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*out = GetBootReason();
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return ResultSuccess;
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}
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Result SecureMonitorWrapper::GenerateAesKek(AccessKey *out_access_key, const KeySource &key_source, u32 generation, u32 option) {
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return ConvertToSplResult(SmcWrapper::GenerateAesKek(out_access_key, key_source, generation, option));
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}
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Result SecureMonitorWrapper::LoadAesKey(u32 keyslot, const void *owner, const AccessKey &access_key, const KeySource &key_source) {
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Result rc = ValidateAesKeyslot(keyslot, owner);
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if (R_FAILED(rc)) {
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return rc;
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}
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return ConvertToSplResult(SmcWrapper::LoadAesKey(keyslot, access_key, key_source));
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}
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Result SecureMonitorWrapper::GenerateAesKey(AesKey *out_key, const AccessKey &access_key, const KeySource &key_source) {
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Result rc;
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SmcResult smc_rc;
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static const KeySource s_generate_aes_key_source = {
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.data = {0x89, 0x61, 0x5E, 0xE0, 0x5C, 0x31, 0xB6, 0x80, 0x5F, 0xE5, 0x8F, 0x3D, 0xA2, 0x4F, 0x7A, 0xA8}
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};
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ScopedAesKeyslot keyslot_holder(this);
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if (R_FAILED((rc = keyslot_holder.Allocate()))) {
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return rc;
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}
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smc_rc = SmcWrapper::LoadAesKey(keyslot_holder.GetKeyslot(), access_key, s_generate_aes_key_source);
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if (smc_rc == SmcResult_Success) {
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smc_rc = DecryptAesBlock(keyslot_holder.GetKeyslot(), out_key, &key_source);
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}
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return ConvertToSplResult(smc_rc);
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}
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Result SecureMonitorWrapper::DecryptAesKey(AesKey *out_key, const KeySource &key_source, u32 generation, u32 option) {
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Result rc;
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static const KeySource s_decrypt_aes_key_source = {
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.data = {0x11, 0x70, 0x24, 0x2B, 0x48, 0x69, 0x11, 0xF1, 0x11, 0xB0, 0x0C, 0x47, 0x7C, 0xC3, 0xEF, 0x7E}
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};
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AccessKey access_key;
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if (R_FAILED((rc = GenerateAesKek(&access_key, s_decrypt_aes_key_source, generation, option)))) {
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return rc;
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}
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return GenerateAesKey(out_key, access_key, key_source);
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}
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Result SecureMonitorWrapper::CryptAesCtr(void *dst, size_t dst_size, u32 keyslot, const void *owner, const void *src, size_t src_size, const IvCtr &iv_ctr) {
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Result rc = ValidateAesKeyslot(keyslot, owner);
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if (R_FAILED(rc)) {
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return rc;
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}
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/* Succeed immediately if there's nothing to crypt. */
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if (src_size == 0) {
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return ResultSuccess;
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}
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/* Validate sizes. */
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if (src_size > dst_size || src_size % AES_BLOCK_SIZE != 0) {
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return ResultSplInvalidSize;
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}
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/* We can only map 0x400000 aligned buffers for the SE. With that in mind, we have some math to do. */
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const uintptr_t src_addr = reinterpret_cast<uintptr_t>(src);
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const uintptr_t dst_addr = reinterpret_cast<uintptr_t>(dst);
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const uintptr_t src_addr_page_aligned = src_addr & ~0xFFFul;
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const uintptr_t dst_addr_page_aligned = dst_addr & ~0xFFFul;
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const size_t src_size_page_aligned = ((src_addr + src_size + 0xFFFul) & ~0xFFFul) - src_addr_page_aligned;
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const size_t dst_size_page_aligned = ((dst_addr + dst_size + 0xFFFul) & ~0xFFFul) - dst_addr_page_aligned;
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const u32 src_se_map_addr = CryptAesInMapBase + (src_addr_page_aligned & DeviceAddressSpaceAlignMask);
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const u32 dst_se_map_addr = CryptAesOutMapBase + (dst_addr_page_aligned & DeviceAddressSpaceAlignMask);
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const u32 src_se_addr = CryptAesInMapBase + (src_addr & DeviceAddressSpaceAlignMask);
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const u32 dst_se_addr = CryptAesInMapBase + (dst_addr & DeviceAddressSpaceAlignMask);
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/* Validate aligned sizes. */
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if (src_size_page_aligned > CryptAesSizeMax || dst_size_page_aligned > CryptAesSizeMax) {
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return ResultSplInvalidSize;
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}
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/* Helpers for mapping/unmapping. */
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DeviceAddressSpaceMapHelper in_mapper(g_se_das_hnd, src_se_map_addr, src_addr_page_aligned, src_size_page_aligned, 1);
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DeviceAddressSpaceMapHelper out_mapper(g_se_das_hnd, dst_se_map_addr, dst_addr_page_aligned, dst_size_page_aligned, 2);
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/* Setup SE linked list entries. */
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SeCryptContext *crypt_ctx = reinterpret_cast<SeCryptContext *>(g_work_buffer);
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crypt_ctx->in.num_entries = 0;
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crypt_ctx->in.address = src_se_addr;
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crypt_ctx->in.size = src_size;
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crypt_ctx->out.num_entries = 0;
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crypt_ctx->out.address = dst_se_addr;
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crypt_ctx->out.size = dst_size;
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armDCacheFlush(crypt_ctx, sizeof(*crypt_ctx));
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armDCacheFlush(const_cast<void *>(src), src_size);
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armDCacheFlush(dst, dst_size);
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{
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std::scoped_lock<HosMutex> lk(g_async_op_lock);
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AsyncOperationKey op_key;
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const u32 mode = SmcWrapper::GetCryptAesMode(SmcCipherMode_Ctr, keyslot);
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const u32 dst_ll_addr = g_se_mapped_work_buffer_addr + offsetof(SeCryptContext, out);
|
|
const u32 src_ll_addr = g_se_mapped_work_buffer_addr + offsetof(SeCryptContext, in);
|
|
|
|
SmcResult res = SmcWrapper::CryptAes(&op_key, mode, iv_ctr, dst_ll_addr, src_ll_addr, src_size);
|
|
if (res != SmcResult_Success) {
|
|
return ConvertToSplResult(res);
|
|
}
|
|
|
|
if ((res = WaitCheckStatus(op_key)) != SmcResult_Success) {
|
|
return ConvertToSplResult(res);
|
|
}
|
|
}
|
|
armDCacheFlush(dst, dst_size);
|
|
|
|
return ResultSuccess;
|
|
}
|
|
|
|
Result SecureMonitorWrapper::ComputeCmac(Cmac *out_cmac, u32 keyslot, const void *owner, const void *data, size_t size) {
|
|
Result rc = ValidateAesKeyslot(keyslot, owner);
|
|
if (R_FAILED(rc)) {
|
|
return rc;
|
|
}
|
|
|
|
if (size > MaxWorkBufferSize) {
|
|
return ResultSplInvalidSize;
|
|
}
|
|
|
|
std::memcpy(g_work_buffer, data, size);
|
|
return ConvertToSplResult(SmcWrapper::ComputeCmac(out_cmac, keyslot, g_work_buffer, size));
|
|
}
|
|
|
|
Result SecureMonitorWrapper::AllocateAesKeyslot(u32 *out_keyslot, const void *owner) {
|
|
for (size_t i = 0; i < GetMaxKeyslots(); i++) {
|
|
if (this->keyslot_owners[i] == 0) {
|
|
this->keyslot_owners[i] = owner;
|
|
*out_keyslot = static_cast<u32>(i);
|
|
return ResultSuccess;
|
|
}
|
|
}
|
|
|
|
g_se_keyslot_available_event->Clear();
|
|
return ResultSplOutOfKeyslots;
|
|
}
|
|
|
|
Result SecureMonitorWrapper::ValidateAesKeyslot(u32 keyslot, const void *owner) {
|
|
if (keyslot >= GetMaxKeyslots()) {
|
|
return ResultSplInvalidKeyslot;
|
|
}
|
|
if (this->keyslot_owners[keyslot] != owner) {
|
|
return ResultSplInvalidKeyslot;
|
|
}
|
|
return ResultSuccess;
|
|
}
|
|
|
|
Result SecureMonitorWrapper::FreeAesKeyslot(u32 keyslot, const void *owner) {
|
|
Result rc = ValidateAesKeyslot(keyslot, owner);
|
|
if (R_FAILED(rc)) {
|
|
return rc;
|
|
}
|
|
|
|
/* Clear the keyslot. */
|
|
{
|
|
AccessKey access_key = {};
|
|
KeySource key_source = {};
|
|
|
|
SmcWrapper::LoadAesKey(keyslot, access_key, key_source);
|
|
}
|
|
this->keyslot_owners[keyslot] = nullptr;
|
|
g_se_keyslot_available_event->Signal();
|
|
return ResultSuccess;
|
|
}
|
|
|
|
Result SecureMonitorWrapper::DecryptRsaPrivateKey(void *dst, size_t dst_size, const void *src, size_t src_size, const AccessKey &access_key, const KeySource &key_source, u32 option) {
|
|
struct DecryptRsaPrivateKeyLayout {
|
|
u8 data[RsaPrivateKeySize + RsaPrivateKeyMetaSize];
|
|
};
|
|
DecryptRsaPrivateKeyLayout *layout = reinterpret_cast<DecryptRsaPrivateKeyLayout *>(g_work_buffer);
|
|
|
|
/* Validate size. */
|
|
if (src_size < RsaPrivateKeyMetaSize || src_size > sizeof(DecryptRsaPrivateKeyLayout)) {
|
|
return ResultSplInvalidSize;
|
|
}
|
|
|
|
std::memcpy(layout->data, src, src_size);
|
|
armDCacheFlush(layout, sizeof(*layout));
|
|
|
|
SmcResult smc_res;
|
|
size_t copy_size = 0;
|
|
if (GetRuntimeFirmwareVersion() >= FirmwareVersion_500) {
|
|
copy_size = std::min(dst_size, src_size - RsaPrivateKeyMetaSize);
|
|
smc_res = SmcWrapper::DecryptOrImportRsaPrivateKey(layout->data, src_size, access_key, key_source, SmcDecryptOrImportMode_DecryptRsaPrivateKey);
|
|
} else {
|
|
smc_res = SmcWrapper::DecryptRsaPrivateKey(©_size, layout->data, src_size, access_key, key_source, option);
|
|
copy_size = std::min(dst_size, copy_size);
|
|
}
|
|
|
|
armDCacheFlush(layout, sizeof(*layout));
|
|
if (smc_res == SmcResult_Success) {
|
|
std::memcpy(dst, layout->data, copy_size);
|
|
}
|
|
|
|
return ConvertToSplResult(smc_res);
|
|
}
|
|
|
|
Result SecureMonitorWrapper::FreeAesKeyslots(const void *owner) {
|
|
for (size_t i = 0; i < GetMaxKeyslots(); i++) {
|
|
if (this->keyslot_owners[i] == owner) {
|
|
FreeAesKeyslot(i, owner);
|
|
}
|
|
}
|
|
return ResultSuccess;
|
|
}
|
|
|
|
Handle SecureMonitorWrapper::GetAesKeyslotAvailableEventHandle() {
|
|
return g_se_keyslot_available_event->GetHandle();
|
|
} |