Skip to content

Commit

Permalink
Handle installation for N3DS / 3dssafe users
Browse files Browse the repository at this point in the history
  • Loading branch information
@d0k3
d0k3 committed May 22, 2017
1 parent 3cf150a commit 1dd5e87
Show file tree
Hide file tree
Showing 4 changed files with 269 additions and 2 deletions.
230 changes: 230 additions & 0 deletions source/crypto/keydb.c
View file
Original file line number Diff line number Diff line change
@@ -0,0 +1,230 @@
#include "keydb.h"
#include "aes.h"
#include "sha.h"
#include "ff.h"

#define PATH_KEYDB INPUT_PATH "/" KEYDB_NAME

typedef struct {
u8 slot; // keyslot, 0x00...0x39
char type; // type 'X' / 'Y' / 'N' for normalKey / 'I' for IV
char id[10]; // key ID for special keys, all zero for standard keys
} __attribute__((packed)) AesKeyDesc;

typedef struct {
AesKeyDesc desc; // slot, type, id
u8 keyUnitType; // 0 for ALL units / 1 for devkit exclusive / 2 for retail exclusive
u8 keySha256[32]; // SHA-256 of the key
} __attribute__((packed)) AesKeyHashInfo;

typedef struct {
u8 slot; // keyslot, 0x00...0x39
u8 keyUnitType; // 0 for ALL units / 1 for devkit exclusive / 2 for retail exclusive
u8 sample[16]; // sample data, encoded with src = keyY = ctr = { 0 }
} __attribute__((packed)) AesNcchSampleInfo;

static u64 keyState = 0;
static u64 keyXState = 0;
static u64 keyYState = 0;

u32 GetUnitKeysType(void)
{
static u32 keys_type = KEYS_UNKNOWN;

if (keys_type == KEYS_UNKNOWN) {
static const u8 slot0x2CSampleRetail[16] = {
0xBC, 0xC4, 0x16, 0x2C, 0x2A, 0x06, 0x91, 0xEE, 0x47, 0x18, 0x86, 0xB8, 0xEB, 0x2F, 0xB5, 0x48 };
static const u8 slot0x2CSampleDevkit[16] = {
0x29, 0xB5, 0x5D, 0x9F, 0x61, 0xAC, 0xD2, 0x28, 0x22, 0x23, 0xFB, 0x57, 0xDD, 0x50, 0x8A, 0xF5 };
static u8 zeroes[16] = { 0 };
u8 sample[16] = { 0 };
setup_aeskeyY(0x2C, zeroes);
use_aeskey(0x2C);
set_ctr(zeroes);
aes_decrypt(sample, sample, 1, AES_CNT_CTRNAND_MODE);
if (memcmp(sample, slot0x2CSampleRetail, 16) == 0) {
keys_type = KEYS_RETAIL;
} else if (memcmp(sample, slot0x2CSampleDevkit, 16) == 0) {
keys_type = KEYS_DEVKIT;
}
}

return keys_type;
}

void CryptAesKeyInfo(AesKeyInfo* info) {
static u8 zeroes[16] = { 0 };
u8 ctr[16] = { 0 };
memcpy(ctr, (void*) info, 12); // CTR -> slot + type + id + zeroes
setup_aeskeyY(0x2C, zeroes);
use_aeskey(0x2C);
set_ctr(ctr);
aes_decrypt(info->key, info->key, 1, AES_CNT_CTRNAND_MODE);
info->isEncrypted = !info->isEncrypted;
}

u32 CheckAesKeyInfo(u8* key, u32 keyslot, char type, char* id)
{
static const AesKeyHashInfo keyHashes[] = {
{ { 0x05, 'Y', "" }, KEYS_RETAIL, // Retail N3DS CTRNAND key SHA256
{ 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 }
},
{ { 0x18, 'X', "" }, KEYS_RETAIL, // Retail NCCH Secure3 key SHA256
{ 0x76, 0xC7, 0x6B, 0x65, 0x5D, 0xB8, 0x52, 0x19, 0xC5, 0xD3, 0x5D, 0x51, 0x7F, 0xFA, 0xF7, 0xA4,
0x3E, 0xBA, 0xD6, 0x6E, 0x31, 0xFB, 0xDD, 0x57, 0x43, 0x92, 0x59, 0x37, 0xA8, 0x93, 0xCC, 0xFC }
},
{ { 0x1B, 'X', "" }, KEYS_RETAIL, // Retail NCCH Secure4 key SHA256
{ 0x9A, 0x20, 0x1E, 0x7C, 0x37, 0x37, 0xF3, 0x72, 0x2E, 0x5B, 0x57, 0x8D, 0x11, 0x83, 0x7F, 0x19,
0x7C, 0xA6, 0x5B, 0xF5, 0x26, 0x25, 0xB2, 0x69, 0x06, 0x93, 0xE4, 0x16, 0x53, 0x52, 0xC6, 0xBB }
},
{ { 0x25, 'X', "" }, KEYS_RETAIL, // Retail NCCH 7x key SHA256
{ 0x7E, 0x87, 0x8D, 0xDE, 0x92, 0x93, 0x8E, 0x4C, 0x71, 0x7D, 0xD5, 0x3D, 0x1E, 0xA3, 0x5A, 0x75,
0x63, 0x3F, 0x51, 0x30, 0xD8, 0xCF, 0xD7, 0xC7, 0x6C, 0x8F, 0x4A, 0x8F, 0xB8, 0x70, 0x50, 0xCD }
}/*,
{ { 0x18, 'X', "" }, KEYS_DEVKIT, // DevKit NCCH Secure3 key SHA256
{ 0x08, 0xE1, 0x09, 0x62, 0xF6, 0x5A, 0x09, 0xAA, 0x12, 0x2C, 0x7C, 0xBE, 0xDE, 0xA1, 0x9C, 0x4B,
0x5C, 0x9A, 0x8A, 0xC3, 0xD9, 0x8E, 0xA1, 0x62, 0x04, 0x11, 0xD7, 0xE8, 0x55, 0x70, 0xA6, 0xC2 }
},
{ { 0x1B, 'X', "" }, KEYS_DEVKIT, // DevKit NCCH Secure4 key SHA256
{ 0xA5, 0x3C, 0x3E, 0x5D, 0x09, 0x5C, 0x73, 0x35, 0x21, 0x79, 0x3F, 0x2E, 0x4C, 0x10, 0xCA, 0xAE,
0x87, 0x83, 0x51, 0x53, 0x46, 0x0B, 0x52, 0x39, 0x9B, 0x00, 0x62, 0xF6, 0x39, 0xCB, 0x62, 0x16 }
}*/
};

u8 keySha256[32];
sha_quick(keySha256, key, 16, SHA256_MODE);
for (u32 p = 0; p < sizeof(keyHashes) / sizeof(AesKeyHashInfo); p++) {
if ((keyHashes[p].desc.slot != keyslot) || (keyHashes[p].desc.type != type))
continue;
if ((!id && keyHashes[p].desc.id[0]) || (id && strncmp(id, keyHashes[p].desc.id, 10) != 0))
continue;
if (keyHashes[p].keyUnitType && (keyHashes[p].keyUnitType != GetUnitKeysType()))
continue;
if (memcmp(keySha256, keyHashes[p].keySha256, 32) == 0) {
return 0;
}
}

return 1;
}

u32 CheckKeySlot(u32 keyslot, char type)
{
static const AesNcchSampleInfo keyNcchSamples[] = {
{ 0x18, KEYS_RETAIL, // Retail NCCH Secure3
{ 0x78, 0xBB, 0x84, 0xFA, 0xB3, 0xA2, 0x49, 0x83, 0x9E, 0x4F, 0x50, 0x7B, 0x17, 0xA0, 0xDA, 0x23 } },
{ 0x1B, KEYS_RETAIL, // Retail NCCH Secure4
{ 0xF3, 0x6F, 0x84, 0x7E, 0x59, 0x43, 0x6E, 0xD5, 0xA0, 0x40, 0x4C, 0x71, 0x19, 0xED, 0xF7, 0x0A } },
{ 0x25, KEYS_RETAIL, // Retail NCCH 7x
{ 0x34, 0x7D, 0x07, 0x48, 0xAE, 0x5D, 0xFB, 0xB0, 0xF5, 0x86, 0xD6, 0xB5, 0x14, 0x65, 0xF1, 0xFF } },
{ 0x18, KEYS_DEVKIT, // DevKit NCCH Secure3
{ 0x20, 0x8B, 0xB5, 0x61, 0x94, 0x18, 0x6A, 0x84, 0x91, 0xD6, 0x37, 0x27, 0x91, 0xF3, 0x53, 0xC9 } },
{ 0x1B, KEYS_DEVKIT, // DevKit NCCH Secure4
{ 0xB3, 0x9D, 0xC1, 0xDB, 0x5B, 0x0C, 0xE7, 0x60, 0xBE, 0xAD, 0x5A, 0xBF, 0xD0, 0x86, 0x99, 0x88 } },
{ 0x25, KEYS_DEVKIT, // DevKit NCCH 7x
{ 0xBC, 0x83, 0x7C, 0xC9, 0x99, 0xC8, 0x80, 0x9E, 0x8A, 0xDE, 0x4A, 0xFA, 0xAA, 0x72, 0x08, 0x28 } }
};
u64* state = (type == 'X') ? &keyXState : (type == 'Y') ? &keyYState : (type == 'N') ? &keyState : NULL;

// just to be safe...
if (keyslot >= 0x40)
return 1;

// check if key is already loaded
if ((type != 'I') && ((*state >> keyslot) & 1))
return 0;

// if is not, we may still be able to verify the currently set one (for NCCH keys)
for (u32 p = 0; (type == 'X') && (p < sizeof(keyNcchSamples) / sizeof(AesNcchSampleInfo)); p++) {
if (keyNcchSamples[p].slot != keyslot) // only for keyslots in the keyNcchSamples table!
continue;
if (keyNcchSamples[p].keyUnitType && (keyNcchSamples[p].keyUnitType != GetUnitKeysType()))
continue;
u8 zeroes[16] = { 0 };
u8 sample[16] = { 0 };
setup_aeskeyY(keyslot, zeroes);
use_aeskey(keyslot);
set_ctr(zeroes);
aes_decrypt(sample, sample, 1, AES_CNT_CTRNAND_MODE);
if (memcmp(keyNcchSamples[p].sample, sample, 16) == 0) {
keyXState |= (u64) 1 << keyslot;
return 0;
}
}

// not set up if getting here
return 1;
}

u32 LoadKeyFromFile(u8* key, u32 keyslot, char type, char* id)
{
u8 keystore[16] __attribute__((aligned(32))) = {0};
bool found = false;
FIL fp;
UINT btr;

// use keystore if key == NULL
if (!key) key = keystore;

// checking the obvious
if ((keyslot >= 0x40) || ((type != 'X') && (type != 'Y') && (type != 'N') && (type != 'I')))
return 1;

// check if already loaded
if (!id && (CheckKeySlot(keyslot, type) == 0)) return 0;
// try to get key from 'aeskeydb.bin' file
AesKeyInfo info;
if (f_open(&fp, PATH_KEYDB, FA_READ | FA_OPEN_EXISTING) == FR_OK) {
while ((f_read(&fp, &info, sizeof(AesKeyInfo), &btr) == FR_OK) && (btr == sizeof(AesKeyInfo))) {
if ((info.slot == keyslot) && (info.type == type) &&
((!id && !(info.id[0])) || (id && (strncmp(id, info.id, 10) == 0))) &&
(!info.keyUnitType || (info.keyUnitType == GetUnitKeysType()))) {
found = true;
if (info.isEncrypted)
CryptAesKeyInfo(&info);
memcpy(key, info.key, 16);
break;
}
}
f_close(&fp);
}

// load legacy slot0x??Key?.bin file instead
if (!found && (type != 'I')) {
char path[64];
snprintf(path, 64, "%s/slot0x%02lXKey%s.bin", INPUT_PATH, keyslot,
(id) ? id : (type == 'X') ? "X" : (type == 'Y') ? "Y" : "");
if (f_open(&fp, path, FA_READ | FA_OPEN_EXISTING) == FR_OK) {
if ((f_read(&fp, key, 16, &btr) == FR_OK) && (btr == 16))
found = true;
f_close(&fp);
}
}

// key still not found (duh)
if (!found) return 1; // out of options here

// done if this is an IV
if (type == 'I') return 0;

// verify key (verification is disabled)
// if (CheckAesKeyInfo(key, keyslot, type, id) != 0) return 1;

// now, setup the key
if (type == 'X') {
setup_aeskeyX(keyslot, key);
keyXState |= (u64) 1 << keyslot;
} else if (type == 'Y') {
setup_aeskeyY(keyslot, key);
keyYState |= (u64) 1 << keyslot;
} else { // normalKey includes keyX & keyY
setup_aeskey(keyslot, key);
keyState |= (u64) 1 << keyslot;
keyXState |= (u64) 1 << keyslot;
keyYState |= (u64) 1 << keyslot;
}
use_aeskey(keyslot);

return 0;
}
23 changes: 23 additions & 0 deletions source/crypto/keydb.h
View file
Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
#pragma once

#include "common.h"

#define KEYDB_NAME "aeskeydb.bin"

#define KEYS_UNKNOWN 0
#define KEYS_DEVKIT 1
#define KEYS_RETAIL 2

typedef struct {
u8 slot; // keyslot, 0x00...0x3F
char type; // type 'X' / 'Y' / 'N' for normalKey / 'I' for IV
char id[10]; // key ID for special keys, all zero for standard keys
u8 reserved[2]; // reserved space
u8 keyUnitType; // 0 for ALL units / 1 for retail exclusive / 2 for devkit exclusive
u8 isEncrypted; // 0 if not / anything else if it is
u8 key[16];
} __attribute__((packed)) AesKeyInfo;

u32 GetUnitKeysType(void);
void CryptAesKeyInfo(AesKeyInfo* info);
u32 LoadKeyFromFile(u8* key, u32 keyslot, char type, char* id);
2 changes: 1 addition & 1 deletion source/installer.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -80,7 +80,6 @@ u32 SafeB9SInstaller(void) {


// step #0 - a9lh check
InitNandCrypto(); // for sector0x96 crypto and NAND drives
snprintf(msgA9lh, 64, (IS_A9LH && !IS_SIGHAX) ? "installed" : "not installed");
statusA9lh = STATUS_GREEN;
ShowInstallerStatus();
Expand All @@ -98,6 +97,7 @@ u32 SafeB9SInstaller(void) {
statusSdCard = STATUS_RED;
return 1;
}
InitNandCrypto(); // for sector0x96 crypto and NAND drives
snprintf(msgSdCard, 64, "%lluMB/%lluMB free", sdFree / (1024 * 1024), sdTotal / (1024 * 1024));
statusSdCard = (sdFree < MIN_SD_FREE) ? STATUS_RED : STATUS_GREEN;
ShowInstallerStatus();
Expand Down
16 changes: 15 additions & 1 deletion source/nand/nand.c
View file
Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
#include "nand.h"
#include "keydb.h"
#include "aes.h"
#include "sha.h"
#include "sdmmc.h"
Expand Down Expand Up @@ -94,8 +95,21 @@ bool InitNandCrypto(void)
if (IS_A9LH) { // for a9lh
// store the current SHA256 from register
memcpy(OtpSha256, (void*) REG_SHAHASH, 32);
if (!CheckSector0x96Crypto()) { // 3dssafe users be damned (no offense meant to mashers)
u8 __attribute__((aligned(32))) otp0x90[0x90];
u8 __attribute__((aligned(32))) otp_key[0x10];
u8 __attribute__((aligned(32))) otp_iv[0x10];
memcpy(otp0x90, (u8*) 0x01FFB800, 0x90);
if ((LoadKeyFromFile(otp_key, 0x11, 'N', "OTP") == 0) &&
(LoadKeyFromFile(otp_iv, 0x11, 'I', "IVOTP") == 0)) {
setup_aeskey(0x11, otp_key);
use_aeskey(0x11);
cbc_encrypt(otp0x90, otp0x90, 0x90 / 0x10, AES_CNT_TITLEKEY_ENCRYPT_MODE, otp_iv);
sha_quick(OtpSha256, otp0x90, 0x90, SHA256_MODE);
}
}
}

// part #1: Get NAND CID, set up TWL/CTR counter
u32 NandCid[4];
u8 shasum[32];
Expand Down

0 comments on commit 1dd5e87

Please sign in to comment.