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test aes_xts decryption with supplied functions

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This commit is contained in:
James Tophoven 2019-09-23 16:12:04 +02:00
parent 4db2070b14
commit e22b5d3d3d
3 changed files with 102 additions and 2 deletions
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31
source/keys/keys.c
View file

@ -44,6 +44,7 @@
#include "key_sources.inl"
#include "ccrypto.h"
#include "../libs/fatfs/diskio.h"
#include <string.h>
extern bool sd_mount();
@ -364,6 +365,36 @@ get_tsec: ;
gfx_hexdump(0, tmp, NX_EMMC_BLOCKSIZE);
DRESULT read_res;
read_res = disk_read_mod (tmp, 0, 1, &storage, pkg2_part, 9);
switch (read_res)
{
case RES_OK:
WPRINTF("Successful!");
break; /* 0: Successful */
case RES_ERROR:
WPRINTF("R/W Error!");
break; /* 1: R/W Error */
case RES_WRPRT:
WPRINTF("Write Protected!");
break; /* 2: Write Protected */
case RES_NOTRDY:
WPRINTF("Not Ready!");
break; /* 3: Not Ready */
case RES_PARERR:
WPRINTF("Invalid Parameter!");
break; /* 4: Invalid Parameter */
default:
WPRINTF("No Idea!");
break;
}
gfx_hexdump(0, tmp, NX_EMMC_BLOCKSIZE);
free(tmp);
goto pkg2_done;

70
source/libs/fatfs/diskio.c
View file

@ -27,8 +27,7 @@
#include "diskio.h" /* FatFs lower layer API */
#include "../../mem/heap.h"
#include "../../sec/se.h"
#include "../../storage/nx_emmc.h"
#include "../../storage/sdmmc.h"
#define SDMMC_UPPER_BUFFER 0xB8000000
#define DRAM_START 0x80000000
@ -125,6 +124,73 @@ out:;
return res;
}
DRESULT disk_read_mod (
BYTE *buff, /* Data buffer to store read data */
DWORD sector, /* Start sector in LBA */
UINT count, /* Number of sectors to read */
sdmmc_storage_t *storage,
emmc_part_t *partition,
u32 hiKey
)
{
__attribute__ ((aligned (16))) static u8 tweak[0x10];
__attribute__ ((aligned (16))) static u64 prev_cluster = -1;
__attribute__ ((aligned (16))) static u32 prev_sector = 0;
u32 tweak_exp = 0;
bool regen_tweak = true, cache_sector = false;
u32 s = 0;
if (count == 1) {
for ( ; s < secindex; s++) {
if (sector_cache[s].sector == sector) {
sector_cache[s].visit_count++;
memcpy(buff, sector_cache[s].cached_sector, 0x200);
memcpy(tweak, sector_cache[s].tweak, 0x10);
prev_sector = sector;
prev_cluster = sector / 0x20;
return RES_OK;
}
}
// add to cache
if (s == secindex && s < MAX_SEC_CACHE_ENTRIES) {
sector_cache[s].sector = sector;
sector_cache[s].visit_count++;
cache_sector = true;
secindex++;
}
}
if (nx_emmc_part_read(storage, partition, sector, count, buff)) {
if (prev_cluster != sector / 0x20) { // sector in different cluster than last read
prev_cluster = sector / 0x20;
tweak_exp = sector % 0x20;
} else if (sector > prev_sector) { // sector in same cluster and past last sector
tweak_exp = sector - prev_sector - 1;
regen_tweak = false;
} else { // sector in same cluster and before or same as last sector
tweak_exp = sector % 0x20;
}
// fatfs will never pull more than a cluster
_emmc_xts(hiKey, hiKey - 1, 0, tweak, regen_tweak, tweak_exp, prev_cluster, buff, buff, count * 0x200);
if (cache_sector) {
memcpy(sector_cache[s].cached_sector, buff, 0x200);
memcpy(sector_cache[s].tweak, tweak, 0x10);
}
prev_sector = sector + count - 1;
return RES_OK;
}
return RES_ERROR;
}
DRESULT disk_read (
BYTE pdrv, /* Physical drive number to identify the drive */
BYTE *buff, /* Data buffer to store read data */

3
source/libs/fatfs/diskio.h
View file

@ -10,6 +10,8 @@ extern "C" {
#endif
#include "../../utils/types.h"
#include "../../storage/sdmmc.h"
#include "../../storage/nx_emmc.h"
/* Status of Disk Functions */
typedef BYTE DSTATUS;
@ -31,6 +33,7 @@ typedef enum {
DSTATUS disk_initialize (BYTE pdrv);
DSTATUS disk_status (BYTE pdrv);
DRESULT disk_read (BYTE pdrv, BYTE* buff, DWORD sector, UINT count);
DRESULT disk_read_mod (BYTE *buff, DWORD sector, UINT count, sdmmc_storage_t *storage, emmc_part_t *partition, u32 hiKey);
DRESULT disk_write (BYTE pdrv, const BYTE* buff, DWORD sector, UINT count);
DRESULT disk_ioctl (BYTE pdrv, BYTE cmd, void* buff);