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Proper keydb handling

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This commit is contained in:
d0k3 2016-12-05 22:54:36 +01:00
parent d10315ba64
commit f23d2fd30a
5 changed files with 270 additions and 78 deletions
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4
source/common.h
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@ -40,6 +40,10 @@
// GodMode9 version
#define VERSION "0.8.2"
// input / output paths
#define INPUT_PATHS "0:", "0:/files9", "0:/Decrypt9"
#define OUTPUT_PATH "0:/gm9out"
// buffer area defines (in use by godmode.c)
#define DIR_BUFFER (0x21000000)
#define WORK_BUFFER ((u8*)0x21100000)

235
source/crypto/keydb.c Normal file
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@ -0,0 +1,235 @@
#include "keydb.h"
#include "aes.h"
#include "sha.h"
#include "ff.h"
#define KEYDB_NAME "aeskeydb.bin"
typedef struct {
u8 slot; // keyslot, 0x00...0x39
char type; // type 'X' / 'Y' / 'N' for normalKey
char id[10]; // key ID for special keys, all zero for standard keys
} __attribute__((packed)) AesKeyDesc;
typedef struct {
AesKeyDesc desc; // slot, type, id
u8 isDevkitKey; // 1 if for DevKit unit, 0 otherwise
u8 keySha256[32]; // SHA-256 of the key
} __attribute__((packed)) AesKeyHashInfo;
typedef struct {
u8 slot; // keyslot, 0x00...0x39
u8 isDevkitKey; // 1 if for DevKit unit, 0 otherwise
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', "" }, 0, // 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', "" }, 0, // 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', "" }, 0, // 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', "" }, 0, // 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', "" }, 1, // 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', "" }, 1, // 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 ((bool) keyHashes[p].isDevkitKey != (GetUnitKeysType() == KEYS_DEVKIT))
continue;
if (memcmp(keySha256, keyHashes[p].keySha256, 32) == 0) {
return 0;
}
}
return 1;
}
u32 CheckKeySlot(u32 keyslot, char type)
{
static const AesNcchSampleInfo keyNcchSamples[] = {
{ 0x18, 0, // Retail NCCH Secure3
{ 0x78, 0xBB, 0x84, 0xFA, 0xB3, 0xA2, 0x49, 0x83, 0x9E, 0x4F, 0x50, 0x7B, 0x17, 0xA0, 0xDA, 0x23 } },
{ 0x1B, 0, // Retail NCCH Secure4
{ 0xF3, 0x6F, 0x84, 0x7E, 0x59, 0x43, 0x6E, 0xD5, 0xA0, 0x40, 0x4C, 0x71, 0x19, 0xED, 0xF7, 0x0A } },
{ 0x25, 0, // Retail NCCH 7x
{ 0x34, 0x7D, 0x07, 0x48, 0xAE, 0x5D, 0xFB, 0xB0, 0xF5, 0x86, 0xD6, 0xB5, 0x14, 0x65, 0xF1, 0xFF } },
{ 0x18, 1, // DevKit NCCH Secure3
{ 0x20, 0x8B, 0xB5, 0x61, 0x94, 0x18, 0x6A, 0x84, 0x91, 0xD6, 0x37, 0x27, 0x91, 0xF3, 0x53, 0xC9 } },
{ 0x1B, 1, // DevKit NCCH Secure4
{ 0xB3, 0x9D, 0xC1, 0xDB, 0x5B, 0x0C, 0xE7, 0x60, 0xBE, 0xAD, 0x5A, 0xBF, 0xD0, 0x86, 0x99, 0x88 } },
{ 0x25, 1, // 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 : &keyState;
// just to be safe...
if (keyslot >= 0x40)
return 1;
// check if key is already loaded
if ((*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 ((bool) keyNcchSamples[p].isDevkitKey != (GetUnitKeysType() == KEYS_DEVKIT))
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)
{
const char* base[] = { INPUT_PATHS };
u8 keystore[16] = {0};
bool found = false;
// use keystore if key == NULL
if (!key) key = keystore;
// checking the obvious
if ((keyslot >= 0x40) || ((type != 'X') && (type != 'Y') && (type != 'N')))
return 1;
// check if already loaded
if (!id && (CheckKeySlot(keyslot, type) == 0)) return 0;
// try to get key from 'aeskeydb.bin' file
for (u32 i = 0; !found && (i < (sizeof(base)/sizeof(char*))); i++) {
FIL fp;
char path[64];
AesKeyInfo info;
UINT btr;
snprintf(path, 64, "%s/%s", base[i], KEYDB_NAME);
if (f_open(&fp, path, FA_READ | FA_OPEN_EXISTING) != FR_OK) continue;
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)))) {
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) {
for (u32 i = 0; !found && (i < (sizeof(base)/sizeof(char*))); i++) {
FIL fp;
char path[64];
UINT btr;
snprintf(path, 64, "%s/slot0x%02lXKey%s.bin", base[i], keyslot,
(id) ? id : (type == 'X') ? "X" : (type == 'Y') ? "Y" : "");
if (f_open(&fp, path, FA_READ | FA_OPEN_EXISTING) != FR_OK) continue;
if ((f_read(&fp, key, 16, &btr) == FR_OK) && (btr == 16)) {
found = true;
break;
}
f_close(&fp);
}
}
// key still not found (duh)
if (!found) return 1; // out of options here
// verify key (verification is enforced)
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;
}

20
source/crypto/keydb.h Normal file
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@ -0,0 +1,20 @@
#pragma once
#include "common.h"
#define KEYS_UNKNOWN 0
#define KEYS_RETAIL 1
#define KEYS_DEVKIT 2
typedef struct {
u8 slot; // keyslot, 0x00...0x3F
char type; // type 'X' / 'Y' / 'N' for normalKey
char id[10]; // key ID for special keys, all zero for standard keys
u8 reserved[2]; // reserved space
u8 isDevkitKey; // 0 for retail units / 1 for DevKit units
u8 isEncrypted; // 0 if not / anything else if it is
u8 key[16];
} __attribute__((packed)) AesKeyInfo;
u32 GetUnitKeysType(void);
u32 LoadKeyFromFile(u8* key, u32 keyslot, char type, char* id);

86
source/nand/nand.c
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@ -1,5 +1,6 @@
#include "fs.h"
#include "platform.h"
#include "keydb.h"
#include "aes.h"
#include "sha.h"
#include "sdmmc.h"
@ -38,73 +39,6 @@ static u8 OtpSha256[32] = { 0 };
static u32 emunand_base_sector = 0x000000;
bool LoadKeyFromFile(const char* folder, u8* keydata, u32 keyslot, char type, char* id)
{
char path[256]; // should be enough
u8 key_magic[16];
u8 buffer[32];
u8* key = buffer + 16;
bool found = false;
// check the obvious
if (keyslot >= 0x40)
return false; // invalid keyslot
if ((type != 'X') && (type != 'Y') && (type != 'N'))
return false; // invalid keytype
// search 'aeskeydb.bin' file - setup
snprintf(path, 256, "%s/aeskeydb.bin", folder);
memset(key_magic, 0x00, 16);
key_magic[0] = keyslot;
key_magic[1] = type;
if (id) strncpy((char*) key_magic + 2, id, 10);
// try to find key in 'aeskeydb.bin' file
for (u32 p = 0; FileGetData(path, buffer, 32, p) == 32; p += 32) {
if (memcmp(buffer, key_magic, 12) == 0) {
found = true;
break;
}
}
if (found && buffer[15]) { // encrypted key -> decrypt first
u8 ctr[16] __attribute__((aligned(32)));
u8 keyY[16] __attribute__((aligned(32)));
memset(ctr, 0x00, 16);
memset(keyY, 0x00, 16);
memcpy(ctr, key_magic, 12);
setup_aeskeyY(0x2C, keyY);
use_aeskey(0x2C);
set_ctr(ctr);
aes_decrypt((void*) key, (void*) key, 1, AES_CNT_CTRNAND_MODE);
}
// try legacy slot0x??Key?.bin file
if (!found) {
snprintf(path, 256, "%s/slot0x%02XKey%.10s.bin", folder, (unsigned int) keyslot,
(id) ? id : (type == 'X') ? "X" : (type == 'Y') ? "Y" : "");
if (FileGetData(path, key, 16, 0) == 16)
found = true;
}
// out of options here
if (!found) return false;
// now, setup the key
if (type == 'X') { // keyX
setup_aeskeyX(keyslot, key);
} else if (type == 'Y') { // keyY
setup_aeskeyY(keyslot, key);
} else { // normalKey
setup_aeskey(keyslot, key);
}
use_aeskey(keyslot);
// return the key if memory provided
if (keydata) memcpy(keydata, key, 16);
return true;
}
bool InitNandCrypto(void)
{
// part #0: KeyX / KeyY for secret sector 0x96
@ -113,14 +47,16 @@ bool InitNandCrypto(void)
// store the current SHA256 from register
memcpy(OtpSha256, (void*)REG_SHAHASH, 32);
} else {
const char* base[] = { INPUT_PATHS };
char path[64];
u8 otp[0x100];
if ((FileGetData("0:/otp.bin", otp, 0x100, 0) == 0x100) ||
(FileGetData("0:/otp0x108.bin", otp, 0x100, 0) == 0x100) ||
(FileGetData("0:/Decrypt9/otp.bin", otp, 0x100, 0) == 0x100) ||
(FileGetData("0:/Decrypt9/otp0x108.bin", otp, 0x100, 0) == 0x100) ||
(FileGetData("0:/files9/otp.bin", otp, 0x100, 0) == 0x100) ||
(FileGetData("0:/files9/otp0x108.bin", otp, 0x100, 0) == 0x100))
for (u32 i = 0; i < 2 * (sizeof(base)/sizeof(char*)); i++) {
snprintf(path, 64, "%s/%s", base[i/2], (i%2) ? "otp0x108.bin" : "otp.bin");
if (FileGetData(path, otp, 0x100, 0) == 0x100) {
sha_quick(OtpSha256, otp, 0x90, SHA256_MODE);
break;
}
}
}
// part #1: Get NAND CID, set up TWL/CTR counter
@ -207,9 +143,7 @@ bool InitNandCrypto(void)
}
if ((memcmp(shasum, slot0x05KeyY_sha256, 32) != 0) && // last resort
(!LoadKeyFromFile("0:", slot0x05KeyY, 0x05, 'Y', NULL)) &&
(!LoadKeyFromFile("0:/Decrypt9", slot0x05KeyY, 0x05, 'Y', NULL)) &&
(!LoadKeyFromFile("0:/files9", slot0x05KeyY, 0x05, 'Y', NULL))) {};
(LoadKeyFromFile(slot0x05KeyY, 0x05, 'Y', NULL) != 0)) {};
}
return true;

1
source/nand/nand.h
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@ -10,7 +10,6 @@
#define NAND_TYPE_N3DS (1<<5)
#define NAND_TYPE_NO3DS (1<<6)
bool LoadKeyFromFile(const char* folder, u8* keydata, u32 keyslot, char type, char* id);
bool InitNandCrypto(void);
bool CheckSlot0x05Crypto(void);
bool CheckSector0x96Crypto(void);