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NCCH crypto: Workaround for unrecognized seeds in internal SEEDDB

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This commit is contained in:
d0k3 2017-11-20 17:01:43 +01:00
parent ffc053a682
commit b5f2c64e77
1 changed files with 22 additions and 12 deletions
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24
arm9/source/game/ncch.c
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@ -67,6 +67,7 @@ u32 GetNcchSeed(u8* seed, NcchHeader* ncch) {
}
// try to grab the seed from NAND database
const u32 seed_offset[2] = {SEEDSAVE_AREA_OFFSETS};
const char* nand_drv[] = {"1:", "4:"}; // SysNAND and EmuNAND
for (u32 i = 0; i < (sizeof(nand_drv)/sizeof(char*)); i++) {
// grab the key Y from movable.sed
@ -84,18 +85,26 @@ u32 GetNcchSeed(u8* seed, NcchHeader* ncch) {
nand_drv[i], sha256sum[0], sha256sum[1], sha256sum[2], sha256sum[3]);
// check seedsave for seed
u8* seedsave = (u8*) (TEMP_BUFFER + (TEMP_BUFFER_SIZE/2));
u8* seeddb[2];
seeddb[0] = (u8*) (TEMP_BUFFER + (TEMP_BUFFER_SIZE/2));
seeddb[1] = seeddb[0] + (SEEDSAVE_MAX_ENTRIES*(8+16));
if (f_open(&file, path, FA_READ | FA_OPEN_EXISTING) != FR_OK)
continue;
f_read(&file, seedsave, 0x200, &btr);
u32 p_active = (getle32(seedsave + 0x168)) ? 1 : 0;
static const u32 seed_offset[2] = {SEEDSAVE_AREA_OFFSETS};
f_read(&file, seeddb[0], 0x200, &btr);
u32 p_active = (getle32(seeddb[0] + 0x168)) ? 1 : 0;
// read both partitions
for (u32 p = 0; p < 2; p++) {
f_lseek(&file, seed_offset[(p + p_active) % 2]);
f_read(&file, seedsave, SEEDSAVE_MAX_ENTRIES*(8+16), &btr);
f_read(&file, seeddb[p], SEEDSAVE_MAX_ENTRIES*(8+16), &btr);
}
// search for the seed
for (u32 p = 0; p < 2; p++) {
for (u32 s = 0; s < SEEDSAVE_MAX_ENTRIES; s++) {
if (titleId != getle64(seedsave + (s*8))) continue;
memcpy(lseed, seedsave + (SEEDSAVE_MAX_ENTRIES*8) + (s*16), 16);
if (titleId != getle64(seeddb[p] + (s*8))) continue;
for (u32 p0 = 0; p0 < 2; p0++) {
memcpy(lseed, seeddb[(p+p0)%2] + (SEEDSAVE_MAX_ENTRIES*8) + (s*16), 16);
sha_quick(sha256sum, lseed, 16 + 8, SHA256_MODE);
if (hash_seed == sha256sum[0]) {
memcpy(seed, lseed, 16);
@ -104,6 +113,7 @@ u32 GetNcchSeed(u8* seed, NcchHeader* ncch) {
}
}
}
}
f_close(&file);
}