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storage: Better BIS support

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It now supports more than one crypto block and keys are expected to slot 0 and up to slot 5.
This commit is contained in:
CTCaer 2020-06-14 13:36:36 +03:00
parent d90f5b7e7c
commit 242bbdada5
2 changed files with 59 additions and 19 deletions
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2
common/memory_map.h
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@ -84,7 +84,7 @@
// NX BIS driver sector cache.
#define NX_BIS_CACHE_ADDR 0xFEE00000
#define NX_BIS_CACHE_SZ 0x8800
#define NX_BIS_CACHE_SZ 0x100000
// USB buffers.
#define USBD_ADDR 0xFEF00000

76
nyx/nyx_gui/storage/nx_emmc_bis.c
View file

@ -2,7 +2,7 @@
* eMMC BIS driver for Nintendo Switch
*
* Copyright (c) 2019 shchmue
* Copyright (c) 2019 CTCaer
* Copyright (c) 2019-2020 CTCaer
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@ -26,7 +26,7 @@
#include "../storage/sdmmc.h"
#include "../utils/types.h"
#define MAX_SEC_CACHE_ENTRIES 64
#define MAX_SEC_CACHE_ENTRIES 1500
typedef struct _sector_cache_t
{
@ -37,9 +37,11 @@ typedef struct _sector_cache_t
u8 align[8];
} sector_cache_t;
static u32 sector_idx = 0;
static sector_cache_t *sector_cache = NULL;
static u8 ks_crypt = 0;
static u8 ks_tweak = 0;
static u32 sector_cache_cnt = 0;
static emmc_part_t *system_part = NULL;
static sector_cache_t *sector_cache = (sector_cache_t *)NX_BIS_CACHE_ADDR;
static void _gf256_mul_x_le(u8 *block)
{
@ -90,7 +92,7 @@ static int _nx_aes_xts_crypt_sec(u32 ks1, u32 ks2, u32 enc, u8 *tweak, bool rege
pdst += 0x10;
}
se_aes_crypt_ecb(ks2, 0, dst, sec_size, src, sec_size);
se_aes_crypt_ecb(ks2, enc, dst, sec_size, src, sec_size);
memcpy(tweak, tmp_tweak, 0x10);
@ -107,25 +109,23 @@ static int _nx_aes_xts_crypt_sec(u32 ks1, u32 ks2, u32 enc, u8 *tweak, bool rege
return 1;
}
int nx_emmc_bis_read(u32 sector, u32 count, void *buff)
static int nx_emmc_bis_read_block(u32 sector, u32 count, void *buff)
{
if (!system_part)
return 3; // Not ready.
static u32 prev_cluster = -1;
static u32 prev_sector = 0;
__attribute__ ((aligned (16))) static u8 tweak[0x10];
u32 tweak_exp = 0;
bool regen_tweak = true, cache_sector = false;
if (!sector_cache)
sector_cache = (sector_cache_t *)NX_BIS_CACHE_ADDR;
static u8 tweak[0x10];
u32 cache_idx = 0;
u32 tweak_exp = 0;
bool regen_tweak = true;
bool cache_sector = false;
if (count == 1)
{
for ( ; cache_idx < sector_idx; cache_idx++)
for ( ; cache_idx < sector_cache_cnt; cache_idx++)
{
if (sector_cache[cache_idx].sector == sector)
{
@ -139,12 +139,12 @@ int nx_emmc_bis_read(u32 sector, u32 count, void *buff)
}
}
// add to cache
if (cache_idx == sector_idx && cache_idx < MAX_SEC_CACHE_ENTRIES)
if (cache_idx == sector_cache_cnt && cache_idx < MAX_SEC_CACHE_ENTRIES)
{
sector_cache[cache_idx].sector = sector;
sector_cache[cache_idx].visit_cnt++;
cache_sector = true;
sector_idx++;
sector_cache_cnt++;
}
}
@ -163,8 +163,8 @@ int nx_emmc_bis_read(u32 sector, u32 count, void *buff)
else // Sector in same cluster and before or same as last sector.
tweak_exp = sector % 0x20;
// FatFS will never pull more than a cluster.
_nx_aes_xts_crypt_sec(9, 8, 0, tweak, regen_tweak, tweak_exp, prev_cluster, buff, buff, count << 9);
// Maximum one cluster (1 XTS crypto block 16KB).
_nx_aes_xts_crypt_sec(ks_tweak, ks_crypt, 0, tweak, regen_tweak, tweak_exp, prev_cluster, buff, buff, count << 9);
if (cache_sector)
{
memcpy(sector_cache[cache_idx].data, buff, 0x200);
@ -179,7 +179,47 @@ int nx_emmc_bis_read(u32 sector, u32 count, void *buff)
return 1;
}
int nx_emmc_bis_read(u32 sector, u32 count, void *buff)
{
int res = 1;
u8 *buf = (u8 *)buff;
u32 curr_sct = sector;
while (count)
{
u32 sct_cnt = MIN(count, 0x20);
res = nx_emmc_bis_read_block(curr_sct, sct_cnt, buf);
if (res)
return 1;
count -= sct_cnt;
curr_sct += sct_cnt;
buf += 512 * sct_cnt;
}
return res;
}
void nx_emmc_bis_init(emmc_part_t *part)
{
system_part = part;
sector_cache_cnt = 0;
switch (part->index)
{
case 0: // PRODINFO.
case 1: // PRODINFOF.
ks_crypt = 0;
ks_tweak = 1;
break;
case 8: // SAFE.
ks_crypt = 2;
ks_tweak = 3;
break;
case 9: // SYSTEM.
case 10: // USER.
ks_crypt = 4;
ks_tweak = 5;
break;
}
}