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Cleaned up & improved low-level disko functions

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Thanks Normatt for the NAND CID function!
This commit is contained in:
d0k3 2016-03-03 13:27:51 +01:00
parent adc153db3f
commit f331200506
11 changed files with 194 additions and 162 deletions
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4
Makefile
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@ -18,9 +18,9 @@ include $(DEVKITARM)/ds_rules
#---------------------------------------------------------------------------------
export TARGET := GodMode9
BUILD := build
SOURCES := source source/fatfs source/decryptor source/abstraction
SOURCES := source source/fatfs source/nand source/abstraction
DATA := data
INCLUDES := include source source/fatfs source/decryptor
INCLUDES := include source source/fatfs source/nand
#---------------------------------------------------------------------------------
# options for code generation

185
source/fatfs/diskio.c
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@ -8,21 +8,22 @@
/*-----------------------------------------------------------------------*/
#include "diskio.h" /* FatFs lower layer API */
#include "aes.h"
#include "sha.h"
#include "platform.h"
#include "nand.h"
#include "sdmmc.h"
#define TYPE_SDCARD 0
#define TYPE_SYSNAND 1
#define TYPE_EMUNAND 2
#define SUBTYPE_CTRN_O 0
#define SUBTYPE_CTRN 0
#define SUBTYPE_CTRN_N 1
#define SUBTYPE_TWLN 2
#define SUBTYPE_TWLP 3
#define SUBTYPE_NONE 4
#define SUBTYPE(pd) ((mode_n3ds && (DriveInfo[pd].subtype == SUBTYPE_CTRN)) ? SUBTYPE_CTRN_N : DriveInfo[pd].subtype)
typedef struct {
BYTE type;
BYTE subtype;
@ -31,120 +32,27 @@ typedef struct {
typedef struct {
DWORD offset;
DWORD size;
DWORD mode;
BYTE keyslot;
} SubtypeDesc;
FATpartition DriveInfo[13] = {
FATpartition DriveInfo[7] = {
{ TYPE_SDCARD, SUBTYPE_NONE }, // 0 - SDCARD
{ TYPE_SYSNAND, SUBTYPE_CTRN_O }, // 1 - SYSNAND O3DS CTRNAND
{ TYPE_SYSNAND, SUBTYPE_TWLN }, // 2 - SYSNAND O3DS TWLN
{ TYPE_SYSNAND, SUBTYPE_TWLP }, // 3 - SYSNAND O3DS TWLP
{ TYPE_EMUNAND, SUBTYPE_CTRN_O }, // 4 - EMUNAND O3DS CTRNAND
{ TYPE_EMUNAND, SUBTYPE_TWLN }, // 5 - EMUNAND O3DS TWLN
{ TYPE_EMUNAND, SUBTYPE_TWLP }, // 6 - EMUNAND O3DS TWLP
{ TYPE_SYSNAND, SUBTYPE_CTRN_N }, // *1 - SYSNAND N3DS CTRNAND
{ TYPE_SYSNAND, SUBTYPE_TWLN }, // *2 - SYSNAND N3DS TWLN
{ TYPE_SYSNAND, SUBTYPE_TWLP }, // *3 - SYSNAND N3DS TWLP
{ TYPE_EMUNAND, SUBTYPE_CTRN_N }, // *4 - EMUNAND N3DS CTRNAND
{ TYPE_EMUNAND, SUBTYPE_TWLN }, // *5 - EMUNAND N3DS TWLN
{ TYPE_EMUNAND, SUBTYPE_TWLP }, // *6 - EMUNAND N3DS TWLP
{ TYPE_SYSNAND, SUBTYPE_CTRN }, // 1 - SYSNAND CTRNAND
{ TYPE_SYSNAND, SUBTYPE_TWLN }, // 2 - SYSNAND TWLN
{ TYPE_SYSNAND, SUBTYPE_TWLP }, // 3 - SYSNAND TWLP
{ TYPE_EMUNAND, SUBTYPE_CTRN }, // 4 - EMUNAND CTRNAND
{ TYPE_EMUNAND, SUBTYPE_TWLN }, // 5 - EMUNAND TWLN
{ TYPE_EMUNAND, SUBTYPE_TWLP }, // 6 - EMUNAND TWLP
};
SubtypeDesc SubTypes[4] = {
{ 0x05CAE5, 0x179F1B, AES_CNT_CTRNAND_MODE, 0x4 }, // O3DS CTRNAND
{ 0x05CAD7, 0x20E969, AES_CNT_CTRNAND_MODE, 0x5 }, // N3DS CTRNAND
{ 0x000097, 0x047DA9, AES_CNT_TWLNAND_MODE, 0x3 }, // TWLN
{ 0x04808D, 0x0105B3, AES_CNT_TWLNAND_MODE, 0x3 } // TWLP
{ 0x05CAE5, 0x179F1B, 0x4 }, // O3DS CTRNAND
{ 0x05CAD7, 0x20E969, 0x5 }, // N3DS CTRNAND
{ 0x000097, 0x047DA9, 0x3 }, // TWLN
{ 0x04808D, 0x0105B3, 0x3 } // TWLP
};
static bool mode_n3ds = false;
static u32 emunand_base_sector = 0x000000;
/*-----------------------------------------------------------------------*/
/* Get counter for NAND AES decryption */
/*-----------------------------------------------------------------------*/
/*u32 GetNandCtr(u8* ctr, u32 sector)
{
static const u8* version_ctrs[] = {
(u8*)0x080D7CAC,
(u8*)0x080D858C,
(u8*)0x080D748C,
(u8*)0x080D740C,
(u8*)0x080D74CC,
(u8*)0x080D794C
};
static const u32 version_ctrs_len = sizeof(version_ctrs) / sizeof(u32);
static u8* ctr_start = NULL;
if (ctr_start == NULL) {
for (u32 i = 0; i < version_ctrs_len; i++) {
if (*(u32*)version_ctrs[i] == 0x5C980) {
ctr_start = (u8*) version_ctrs[i] + 0x30;
}
}
// If value not in previous list start memory scanning (test range)
if (ctr_start == NULL) {
for (u8* c = (u8*) 0x080D8FFF; c > (u8*) 0x08000000; c--) {
if (*(u32*)c == 0x5C980 && *(u32*)(c + 1) == 0x800005C9) {
ctr_start = c + 0x30;
break;
}
}
}
if (ctr_start == NULL) {
return 1;
}
}
// the ctr is stored backwards in memory
if (sector >= (0x0B100000 / 0x200)) { // CTRNAND/AGBSAVE region
for (u32 i = 0; i < 16; i++)
ctr[i] = *(ctr_start + (0xF - i));
} else { // TWL region
for (u32 i = 0; i < 16; i++)
ctr[i] = *(ctr_start + 0x88 + (0xF - i));
}
// increment counter
add_ctr(ctr, sector * (0x200/0x10));
return 0;
}*/
u32 GetNandCtr(u8* ctr, u32 sector)
{
static u8* NandCid = NULL;
static u8 CtrNandCtr[16];
static u8 TwlNandCtr[16];
if (!NandCid) {
NandCid = (u8*) 0x01FFCD84;
u8 shasum[32];
sha_init(SHA256_MODE);
sha_update(NandCid, 16);
sha_get(shasum);
memcpy(CtrNandCtr, shasum, 16);
sha_init(SHA1_MODE);
sha_update(NandCid, 16);
sha_get(shasum);
for(u32 i = 0; i < 16; i++) // little endian and reversed order
TwlNandCtr[i] = shasum[15-i];
}
// copy NAND CTR over
memcpy(ctr, (sector >= (0x0B100000 / 0x200)) ? CtrNandCtr : TwlNandCtr, 16);
// increment counter
add_ctr(ctr, sector * (0x200/0x10));
return 0;
}
/*-----------------------------------------------------------------------*/
@ -171,7 +79,8 @@ DSTATUS disk_initialize (
)
{
mode_n3ds = (GetUnitPlatform() == PLATFORM_N3DS);
sdmmc_sdcard_init();
sdmmc_sdcard_init(); // multiple inits should not be required (also, below)
InitNandCrypto();
return RES_OK;
}
@ -189,9 +98,6 @@ DRESULT disk_read (
UINT count /* Number of sectors to read */
)
{
if ((pdrv > 0) && mode_n3ds)
pdrv += 6;
BYTE type = DriveInfo[pdrv].type;
if (type == TYPE_SDCARD) {
@ -199,28 +105,12 @@ DRESULT disk_read (
return RES_PARERR;
}
} else {
BYTE subtype = DriveInfo[pdrv].subtype;
BYTE subtype = SUBTYPE(pdrv);
BYTE keyslot = SubTypes[subtype].keyslot;
DWORD isector = SubTypes[subtype].offset + sector;
DWORD mode = SubTypes[subtype].mode;
BYTE ctr[16] __attribute__((aligned(32)));
if (type == TYPE_SYSNAND) {
if (sdmmc_nand_readsectors(isector, count, buff))
if (ReadNandSectors(buff, isector, count, keyslot, type == TYPE_EMUNAND))
return RES_PARERR;
} else if (sdmmc_sdcard_readsectors(emunand_base_sector + isector, count, buff)) {
return RES_PARERR;
}
if (GetNandCtr(ctr, isector) != 0)
return RES_PARERR;
use_aeskey(SubTypes[subtype].keyslot);
for (UINT s = 0; s < count; s++) {
for (UINT b = 0x0; b < 0x200; b += 0x10, buff += 0x10) {
set_ctr(ctr);
aes_decrypt((void*) buff, (void*) buff, 1, mode);
add_ctr(ctr, 0x1);
}
}
}
return RES_OK;
@ -241,37 +131,19 @@ DRESULT disk_write (
UINT count /* Number of sectors to write */
)
{
if ((pdrv > 0) && mode_n3ds)
pdrv += 6;
BYTE type = DriveInfo[pdrv].type;
if (DriveInfo[pdrv].type == TYPE_SDCARD) {
if (type == TYPE_SDCARD) {
if (sdmmc_sdcard_writesectors(sector, count, (BYTE *)buff)) {
return RES_PARERR;
}
} else {
BYTE subtype = DriveInfo[pdrv].subtype;
/*BYTE subtype = SUBTYPE(pdrv);
BYTE keyslot = SubTypes[subtype].keyslot;
DWORD isector = SubTypes[subtype].offset + sector;
DWORD mode = SubTypes[subtype].mode;
BYTE ctr[16] __attribute__((aligned(32)));
if (GetNandCtr(ctr, isector) != 0)
return RES_PARERR;
use_aeskey(SubTypes[subtype].keyslot);
for (UINT s = 0; s < count; s++) {
for (UINT b = 0x0; b < 0x200; b += 0x10, buff += 0x10) {
set_ctr(ctr);
aes_decrypt((void*) buff, (void*) buff, 1, mode);
add_ctr(ctr, 0x1);
}
}
if (type == TYPE_SYSNAND) {
if (sdmmc_nand_writesectors(isector, count, buff))
return RES_PARERR;
} else if (sdmmc_sdcard_writesectors(emunand_base_sector + isector, count, buff)) {
return RES_PARERR;
}
// stubbed, better be safe!
if (WriteNandSectors(buff, isector, count, keyslot, type == TYPE_EMUNAND))
return RES_PARERR;*/ // stubbed!
}
return RES_OK;
@ -294,9 +166,6 @@ DRESULT disk_ioctl (
void *buff /* Buffer to send/receive control data */
)
{
if ((pdrv > 0) && mode_n3ds)
pdrv += 6;
switch (cmd) {
case GET_SECTOR_SIZE:
*((DWORD*) buff) = 0x200;
@ -305,7 +174,7 @@ DRESULT disk_ioctl (
if (DriveInfo[pdrv].type == TYPE_SDCARD) {
*((DWORD*) buff) = getMMCDevice(1)->total_size;
} else {
*((DWORD*) buff) = SubTypes[DriveInfo[pdrv].subtype].size;
*((DWORD*) buff) = SubTypes[SUBTYPE(pdrv)].size;
}
return RES_OK;
case GET_BLOCK_SIZE:

2
source/fs.c
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@ -6,7 +6,7 @@
static FATFS* fs = (FATFS*)0x20316000;
// this is the main buffer
static u8* main_buffer = (u8*)0x21100000;
static u8* main_buffer = (u8*)0x21200000;
// this is the main buffer size
static size_t main_buffer_size = 1 * 1024 * 1024;

0
source/fatfs/aes.c → source/nand/aes.c
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0
source/fatfs/aes.h → source/nand/aes.h
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106
source/nand/nand.c Normal file
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@ -0,0 +1,106 @@
#include "fs.h"
#include "draw.h"
#include "hid.h"
#include "platform.h"
#include "aes.h"
#include "sha.h"
#include "sdmmc.h"
#include "nand.h"
#define NAND_BUFFER ((u8*)0x21100000)
#define NAND_BUFFER_SIZE (0x100000) // must be multiple of 0x200
static u8 CtrNandCtr[16];
static u8 TwlNandCtr[16];
static u32 emunand_base_sector = 0x000000;
bool InitNandCrypto(void)
{
// STEP #1: Get NAND CID, set up TWL/CTR counter
u8 NandCid[16];
u8 shasum[32];
sdmmc_get_cid( 1, (uint32_t*) NandCid);
sha_init(SHA256_MODE);
sha_update(NandCid, 16);
sha_get(shasum);
memcpy(CtrNandCtr, shasum, 16);
sha_init(SHA1_MODE);
sha_update(NandCid, 16);
sha_get(shasum);
for(u32 i = 0; i < 16; i++) // little endian and reversed order
TwlNandCtr[i] = shasum[15-i];
// STEP #2: Calculate slot 0x3 key, set it up to slot 0x11
return true;
}
void CryptNand(u8* buffer, u32 sector, u32 count, u32 keyslot)
{
u32 mode = (sector >= (0x0B100000 / 0x200)) ? AES_CNT_CTRNAND_MODE : AES_CNT_TWLNAND_MODE;
u8 ctr[16] __attribute__((aligned(32)));
// copy NAND CTR and increment it
memcpy(ctr, (sector >= (0x0B100000 / 0x200)) ? CtrNandCtr : TwlNandCtr, 16);
add_ctr(ctr, sector * (0x200/0x10));
// decrypt the data
use_aeskey(keyslot);
for (u32 s = 0; s < count; s++) {
for (u32 b = 0x0; b < 0x200; b += 0x10, buffer += 0x10) {
set_ctr(ctr);
aes_decrypt((void*) buffer, (void*) buffer, 1, mode);
add_ctr(ctr, 0x1);
}
}
}
int ReadNandSectors(u8* buffer, u32 sector, u32 count, u32 keyslot, bool read_emunand)
{
if (read_emunand) {
int errorcode = sdmmc_sdcard_readsectors(emunand_base_sector + sector, count, buffer);
if (errorcode) return errorcode;
} else {
int errorcode = sdmmc_nand_readsectors(sector, count, buffer);
if (errorcode) return errorcode;
}
CryptNand(buffer, sector, count, keyslot);
return 0;
}
int WriteNandSectors(const u8* buffer, u32 sector, u32 count, u32 keyslot, bool write_emunand)
{
// buffer must not be changed, so this is a little complicated
for (u32 s = 0; s < count; s += (NAND_BUFFER_SIZE / 0x200)) {
u32 pcount = min((NAND_BUFFER_SIZE/0x200), (count - s));
memcpy(NAND_BUFFER, buffer + (s*0x200), pcount * 0x200);
CryptNand(NAND_BUFFER, sector + s, pcount, keyslot);
if (write_emunand) {
int errorcode = sdmmc_sdcard_writesectors(emunand_base_sector + sector + s, pcount, NAND_BUFFER);
if (errorcode) return errorcode;
} else {
int errorcode = sdmmc_nand_writesectors(sector + s, pcount, NAND_BUFFER);
if (errorcode) return errorcode;
}
}
return 0;
}
u32 GetEmuNandBase(void)
{
return emunand_base_sector;
}
u32 SwitchEmuNandBase(int start_sector)
{
// switching code goes here
return emunand_base_sector;
}

13
source/nand/nand.h Normal file
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@ -0,0 +1,13 @@
#pragma once
#include "common.h"
bool InitNandCrypto(void);
void CryptNand(u8* buffer, u32 sector, u32 count, u32 keyslot);
int ReadNandSectors(u8* buffer, u32 sector, u32 count, u32 keyslot, bool read_emunand);
int WriteNandSectors(const u8* buffer, u32 sector, u32 count, u32 keyslot, bool write_emunand);
u32 GetEmuNandBase(void);
u32 SwitchEmuNandBase(int start_sector);

42
source/fatfs/sdmmc.c → source/nand/sdmmc.c
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@ -618,3 +618,45 @@ void sdmmc_sdcard_init()
SD_Init();
DEBUGPRINT(topScreen, "sd_res ", sd_res, 10, 20 + 4*8, RGB(40, 40, 40), RGB(208, 208, 208));
}
int sdmmc_get_cid( int isNand, uint32_t *info)
{
struct mmcdevice *device;
if(isNand)
device = &handelNAND;
else
device = &handelSD;
inittarget(device);
// use cmd7 to put sd card in standby mode
// CMD7
{
sdmmc_send_command(device,0x10507,0);
//if((device->error & 0x4)) return -1;
}
// get sd card info
// use cmd10 to read CID
{
sdmmc_send_command(device,0x1060A,device->initarg << 0x10);
//if((device->error & 0x4)) return -2;
for( int i = 0; i < 4; ++i ) {
info[i] = device->ret[i];
}
}
// put sd card back to transfer mode
// CMD7
{
sdmmc_send_command(device,0x10507,device->initarg << 0x10);
//if((device->error & 0x4)) return -3;
}
if(isNand)
{
inittarget(&handelSD);
}
return 0;
}

2
source/fatfs/sdmmc.h → source/nand/sdmmc.h
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@ -131,6 +131,8 @@ extern "C" {
int sdmmc_nand_readsectors(uint32_t sector_no, uint32_t numsectors, uint8_t *out);
int sdmmc_nand_writesectors(uint32_t sector_no, uint32_t numsectors, uint8_t *in);
int sdmmc_get_cid( int isNand, uint32_t *info);
mmcdevice *getMMCDevice(int drive);
void InitSD();

0
source/fatfs/sha.c → source/nand/sha.c
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0
source/fatfs/sha.h → source/nand/sha.h
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