mirror of
https://vps.suchmeme.nl/git/mudkip/Lockpick_RCM.git
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268 lines
9.0 KiB
C
268 lines
9.0 KiB
C
/*
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* Copyright (c) 2019-2020 shchmue
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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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/*-----------------------------------------------------------------------*/
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/* Low level disk I/O module skeleton for FatFs (C)ChaN, 2016 */
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/*-----------------------------------------------------------------------*/
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/* If a working storage control module is available, it should be */
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/* attached to the FatFs via a glue function rather than modifying it. */
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/* This is an example of glue functions to attach various exsisting */
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/* storage control modules to the FatFs module with a defined API. */
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/*-----------------------------------------------------------------------*/
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#include <string.h>
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#include "../../../common/memory_map.h"
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#include "diskio.h" /* FatFs lower layer API */
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#include "../../mem/heap.h"
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#include "../../sec/se.h"
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#include "../../storage/nx_emmc.h"
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#include "../../storage/sdmmc.h"
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extern sdmmc_storage_t sd_storage;
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extern sdmmc_storage_t storage;
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extern emmc_part_t *system_part;
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#define MAX_CLUSTER_CACHE_ENTRIES 128
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#define CLUSTER_LOOKUP_EMPTY_ENTRY 0xFFFFFFFF
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#define XTS_CLUSTER_SIZE 0x4000
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#define SECTORS_PER_CLUSTER 0x20
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typedef struct {
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u32 cluster_num; // index of the cluster in the partition
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u32 visit_count; // used for debugging/access analysis
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u8 dirty; // has been modified without writeback flag
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u8 align[7];
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u8 cluster[XTS_CLUSTER_SIZE]; // the cached cluster itself
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} cluster_cache_t;
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static cluster_cache_t *cluster_cache = (cluster_cache_t *)RAM_DISK_ADDR;
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u32 cluster_cache_index = 0;
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u32 *cluster_lookup = (u32 *)(RAM_DISK_ADDR + MAX_CLUSTER_CACHE_ENTRIES * sizeof(cluster_cache_t));
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u8 *emmc_buffer = (u8 *)(MIXD_BUF_ALIGNED + 0x100000);
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bool clear_cluster_cache = false;
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bool lock_cluster_cache = false;
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DSTATUS disk_status (
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BYTE pdrv /* Physical drive number to identify the drive */
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)
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{
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return 0;
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}
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DSTATUS disk_initialize (
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BYTE pdrv /* Physical drive number to identify the drive */
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)
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{
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return 0;
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}
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static inline void _gf256_mul_x_le(void *block)
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{
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u32 *pdata = (u32 *)block;
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u32 carry = 0;
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for (u32 i = 0; i < 4; i++) {
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u32 b = pdata[i];
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pdata[i] = (b << 1) | carry;
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carry = b >> 31;
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}
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if (carry)
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pdata[0x0] ^= 0x87;
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}
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static inline int _emmc_xts(u32 ks1, u32 ks2, u32 enc, u8 *tweak, bool regen_tweak, u32 tweak_exp, u64 sec, void *dst, void *src, u32 secsize)
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{
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int res = 0;
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u8 *temptweak = (u8 *)malloc(0x10);
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u32 *pdst = (u32 *)dst;
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u32 *psrc = (u32 *)src;
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u32 *ptweak = (u32 *)tweak;
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if (regen_tweak) {
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for (int i = 0xF; i >= 0; i--) {
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tweak[i] = sec & 0xFF;
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sec >>= 8;
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}
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if (!se_aes_crypt_block_ecb(ks1, 1, tweak, tweak))
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goto out;
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}
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// tweak_exp allows us to use a saved tweak to reduce _gf256_mul_x_le calls
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for (u32 i = 0; i < tweak_exp * SECTORS_PER_CLUSTER; i++)
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_gf256_mul_x_le(tweak);
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memcpy(temptweak, tweak, 0x10);
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// The reference implementation in IEEE P1619 encrypts once per AES block
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// In this environment, doing so produces a lot of overhead
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// Instead, we perform one single AES-ECB operation between the sector xors
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// We are assuming a 0x10-aligned sector size in this implementation.
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for (u32 i = 0; i < secsize / 0x10; i++)
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{
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for (u32 j = 0; j < 4; j++)
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pdst[j] = psrc[j] ^ ptweak[j];
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_gf256_mul_x_le(tweak);
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psrc += 4;
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pdst += 4;
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}
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se_aes_crypt_ecb(ks2, enc, dst, secsize, dst, secsize);
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pdst = (u32 *)dst;
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memcpy(tweak, temptweak, 0x10);
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for (u32 i = 0; i < secsize / 0x10; i++)
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{
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for (u32 j = 0; j < 4; j++)
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pdst[j] = pdst[j] ^ ptweak[j];
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_gf256_mul_x_le(tweak);
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pdst += 4;
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}
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res = 1;
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out:;
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free(temptweak);
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return res;
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}
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DRESULT disk_read (
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BYTE pdrv, /* Physical drive number to identify the drive */
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BYTE *buff, /* Data buffer to store read data */
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DWORD sector, /* Start sector in LBA */
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UINT count /* Number of sectors to read */
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)
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{
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switch (pdrv)
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{
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case 0:
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return sdmmc_storage_read(&sd_storage, sector, count, buff) ? RES_OK : RES_ERROR;
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case 1:;
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__attribute__ ((aligned (16))) static u8 tweak[0x10];
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__attribute__ ((aligned (16))) static u64 prev_cluster = -1;
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__attribute__ ((aligned (16))) static u32 prev_sector = 0;
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if (cluster_cache_index == 0 || clear_cluster_cache)
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{
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// memset gets optimized out...
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// for (u32 i = 0; i < (system_part->lba_end - system_part->lba_start + 1) / SECTORS_PER_CLUSTER; i++)
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// cluster_lookup[i] = CLUSTER_LOOKUP_EMPTY_ENTRY;
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memset(cluster_lookup, -1, (system_part->lba_end - system_part->lba_start + 1) / SECTORS_PER_CLUSTER * 4);
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cluster_cache_index = 0;
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clear_cluster_cache = false;
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lock_cluster_cache = false;
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}
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u32 cluster = sector / SECTORS_PER_CLUSTER;
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u32 aligned_sector = cluster * SECTORS_PER_CLUSTER;
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u32 sector_index_in_cluster = sector % SECTORS_PER_CLUSTER;
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u32 cluster_lookup_index = cluster_lookup[cluster];
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if (cluster_lookup_index != CLUSTER_LOOKUP_EMPTY_ENTRY)
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{
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memcpy(buff, cluster_cache[cluster_lookup_index].cluster + sector_index_in_cluster * NX_EMMC_BLOCKSIZE, count * NX_EMMC_BLOCKSIZE);
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cluster_cache[cluster_lookup_index].visit_count++;
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prev_sector = sector + count - 1;
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prev_cluster = cluster;
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return RES_OK;
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}
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// Only cache single-sector reads as these are most likely to be repeated (eg. boot block, FAT directory tables)
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if (count == 1 &&
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!lock_cluster_cache &&
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cluster_cache_index < MAX_CLUSTER_CACHE_ENTRIES &&
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cluster_lookup_index == CLUSTER_LOOKUP_EMPTY_ENTRY)
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{
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cluster_cache[cluster_cache_index].cluster_num = cluster;
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cluster_cache[cluster_cache_index].visit_count = 1;
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cluster_cache[cluster_cache_index].dirty = 0;
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cluster_lookup[cluster] = cluster_cache_index;
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// Read and decrypt the whole cluster the sector resides in
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if (!nx_emmc_part_read(&storage, system_part, aligned_sector, SECTORS_PER_CLUSTER, emmc_buffer))
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return RES_ERROR;
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_emmc_xts(9, 8, 0, tweak, true, 0, cluster, emmc_buffer, emmc_buffer, XTS_CLUSTER_SIZE);
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memcpy(cluster_cache[cluster_cache_index].cluster, emmc_buffer, XTS_CLUSTER_SIZE);
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memcpy(buff, emmc_buffer + sector_index_in_cluster * NX_EMMC_BLOCKSIZE, NX_EMMC_BLOCKSIZE);
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prev_cluster = -1;
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prev_sector = 0;
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cluster_cache_index++;
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return RES_OK;
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}
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if (!nx_emmc_part_read(&storage, system_part, sector, count, buff))
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return RES_ERROR;
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u32 tweak_exp = 0;
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bool regen_tweak = true;
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if (prev_cluster != cluster)
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{ // Sector is in different cluster than last read
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prev_cluster = cluster;
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tweak_exp = sector_index_in_cluster;
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}
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else if (sector > prev_sector)
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{ // Sector is in same cluster and past last sector
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// Calculates the new tweak using the saved one, reducing expensive _gf256_mul_x_le calls
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tweak_exp = sector - prev_sector - 1;
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regen_tweak = false;
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}
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else
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{ // Sector is in same cluster and before or same as last sector
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tweak_exp = sector_index_in_cluster;
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}
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// FatFs will never pull more than one 4K cluster, which is the same as the crypto 'sector' size
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_emmc_xts(9, 8, 0, tweak, regen_tweak, tweak_exp, prev_cluster, buff, buff, count * NX_EMMC_BLOCKSIZE);
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prev_sector = sector + count - 1;
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return RES_OK;
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}
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return RES_ERROR;
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}
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DRESULT disk_write (
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BYTE pdrv, /* Physical drive number to identify the drive */
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const BYTE *buff, /* Data to be written */
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DWORD sector, /* Start sector in LBA */
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UINT count /* Number of sectors to write */
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)
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{
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switch (pdrv)
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{
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case 0:
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return sdmmc_storage_write(&sd_storage, sector, count, (void *)buff) ? RES_OK : RES_ERROR;
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case 1:
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return RES_WRPRT;
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}
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return RES_ERROR;
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}
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DRESULT disk_ioctl (
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BYTE pdrv, /* Physical drive number (0..) */
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BYTE cmd, /* Control code */
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void *buff /* Buffer to send/receive control data */
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)
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{
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return RES_OK;
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}
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