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Enable setting up 0x05 KeyY on FIRM81

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d0k3 2016-06-10 02:28:13 +02:00
parent 297bc2ec1b
commit a74f4c79ca
2 changed files with 43 additions and 31 deletions
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2
source/godmode.c
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@ -7,7 +7,7 @@
#include "virtual.h"
#include "image.h"
#define VERSION "0.5.1"
#define VERSION "0.5.2"
#define N_PANES 2
#define IMG_DRV "789I"

68
source/nand/nand.c
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@ -10,8 +10,8 @@
#define NAND_BUFFER_SIZE (0x100000) // must be multiple of 0x200
#define NAND_MIN_SECTORS ((GetUnitPlatform() == PLATFORM_N3DS) ? 0x26C000 : 0x1D7800)
static u8 slot0x05KeyY[0x10] = { 0x00 }; // need to load this from file
static u8 slot0x05KeyY_sha256[0x20] = { // hash for slot0x05KeyY file
static u8 slot0x05KeyY[0x10] = { 0x00 }; // need to load this up from FIRM0 / external file
static u8 slot0x05KeyY_sha256[0x20] = { // hash for slot0x05KeyY (16 byte)
0x98, 0x24, 0x27, 0x14, 0x22, 0xB0, 0x6B, 0xF2, 0x10, 0x96, 0x9C, 0x36, 0x42, 0x53, 0x7C, 0x86,
0x62, 0x22, 0x5C, 0xFD, 0x6F, 0xAE, 0x9B, 0x0A, 0x85, 0xA5, 0xCE, 0x21, 0xAA, 0xB6, 0xC8, 0x4D
};
@ -165,37 +165,49 @@ bool InitNandCrypto(void)
if ((*(vu32*) 0x101401C0) == 0) { // only for a9lh
u8 ctr[16] __attribute__((aligned(32)));
u8 keyY[16] __attribute__((aligned(32)));
u8 buffer[0x200];
u8 header[0x200];
// section 2 of FIRM0
// this is @0x066A00 in the FIRM90
ReadNandSectors(buffer, 0x58980 + 0x335, 1, 0x06, NAND_SYSNAND);
memcpy(keyY, buffer + 0x10, 0x10); // 0x15 keyY
memcpy(ctr, buffer + 0x20, 0x10); // 0x15 counter
add_ctr(ctr, (0x758 - (0x335 + 0x4)) * 0x20);
// section 2 header of FIRM0
// this is @0x066A00 in FIRM90 & FIRM81
static u32 offsetSection2 = 0x066A00;
ReadNandSectors(header, 0x58980 + (offsetSection2 / 0x200), 1, 0x06, NAND_SYSNAND);
memcpy(keyY, header + 0x10, 0x10); // 0x15 keyY
// sector containing the slot0x05 keyY
// key is encrypted @0x0EB014 in the FIRM90
ReadNandSectors(buffer, 0x58980 + 0x758, 1, 0x06, NAND_SYSNAND);
// try FRIM90 & FIRM81 offsets, search for the key
for (u32 fver = 0; fver < 2; fver++) {
static u32 offset0x05KeyY[2] = { 0x0EB014, 0x0EB24C };
u32 offset = offset0x05KeyY[fver];
u8 sector[0x200];
// decrypt the buffer, get the key
setup_aeskeyY(0x15, keyY);
use_aeskey(0x15);
for (u32 i = 0x0; i < 0x200; i += 0x10) {
set_ctr(ctr);
aes_decrypt(buffer + i, buffer + i, 1, AES_CNT_CTRNAND_MODE);
add_ctr(ctr, 0x1);
// sector containing the slot0x05 keyY
// key is encrypted @0x0EB014 in the FIRM90
// key is encrypted @0x0EB24C in the FIRM81
ReadNandSectors(sector, 0x58980 + (offset / 0x200), 1, 0x06, NAND_SYSNAND);
// decrypt the sector, get the key
memcpy(ctr, header + 0x20, 0x10); // 0x15 counter
add_ctr(ctr, (offset - (offset % 0x200) - (offsetSection2 + 0x800)) / 16);
for (u32 i = 0x0; i < 0x200; i += 0x10) {
setup_aeskeyY(0x15, keyY);
use_aeskey(0x15);
set_ctr(ctr);
aes_decrypt(sector + i, sector + i, 1, AES_CNT_CTRNAND_MODE);
add_ctr(ctr, 0x1);
}
memcpy(slot0x05KeyY, sector + (offset % 0x200), 16);
// check the key
sha_quick(shasum, slot0x05KeyY, 16, SHA256_MODE);
if (memcmp(shasum, slot0x05KeyY_sha256, 32) == 0) {
setup_aeskeyY(0x05, slot0x05KeyY);
use_aeskey(0x05);
break;
}
}
memcpy(slot0x05KeyY, buffer + 0x14, 16);
// check the key
sha_quick(shasum, slot0x05KeyY, 16, SHA256_MODE);
if (memcmp(shasum, slot0x05KeyY_sha256, 32) == 0) {
setup_aeskeyY(0x05, slot0x05KeyY);
use_aeskey(0x05);
} else if (!LoadKeyFromFile("0:", slot0x05KeyY, 0x05, 'Y', NULL)) { // last resort
LoadKeyFromFile("0:/Decrypt9", slot0x05KeyY, 0x05, 'Y', NULL);
}
if ((memcmp(shasum, slot0x05KeyY_sha256, 32) != 0) && // last resort
(!LoadKeyFromFile("0:", slot0x05KeyY, 0x05, 'Y', NULL)) &&
(!LoadKeyFromFile("0:/Decrypt9", slot0x05KeyY, 0x05, 'Y', NULL))) {};
}
return true;