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test aes_xts decryption with supplied functions

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James Tophoven 2019-09-23 16:12:04 +02:00
commit e22b5d3d3d
3 changed files with 102 additions and 2 deletions
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70
source/libs/fatfs/diskio.c
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@ -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 */