399 lines
10 KiB
C
Executable File
399 lines
10 KiB
C
Executable File
/*
|
|
* crypto.c
|
|
*
|
|
* Crypto libs from http://github.com/b1l1s/ctr
|
|
*/
|
|
|
|
#include "crypto.h"
|
|
#include "memory.h"
|
|
#include "fatfs/sdmmc/sdmmc.h"
|
|
|
|
/****************************************************************
|
|
* Crypto libs
|
|
****************************************************************/
|
|
|
|
/* original version by megazig */
|
|
|
|
#ifndef __thumb__
|
|
#define BSWAP32(x) {\
|
|
__asm__\
|
|
(\
|
|
"eor r1, %1, %1, ror #16\n\t"\
|
|
"bic r1, r1, #0xFF0000\n\t"\
|
|
"mov %0, %1, ror #8\n\t"\
|
|
"eor %0, %0, r1, lsr #8\n\t"\
|
|
:"=r"(x)\
|
|
:"0"(x)\
|
|
:"r1"\
|
|
);\
|
|
};
|
|
|
|
#define ADD_u128_u32(u128_0, u128_1, u128_2, u128_3, u32_0) {\
|
|
__asm__\
|
|
(\
|
|
"adds %0, %4\n\t"\
|
|
"addcss %1, %1, #1\n\t"\
|
|
"addcss %2, %2, #1\n\t"\
|
|
"addcs %3, %3, #1\n\t"\
|
|
: "+r"(u128_0), "+r"(u128_1), "+r"(u128_2), "+r"(u128_3)\
|
|
: "r"(u32_0)\
|
|
: "cc"\
|
|
);\
|
|
}
|
|
#else
|
|
#define BSWAP32(x) {x = __builtin_bswap32(x);}
|
|
|
|
#define ADD_u128_u32(u128_0, u128_1, u128_2, u128_3, u32_0) {\
|
|
__asm__\
|
|
(\
|
|
"mov r4, #0\n\t"\
|
|
"add %0, %0, %4\n\t"\
|
|
"adc %1, %1, r4\n\t"\
|
|
"adc %2, %2, r4\n\t"\
|
|
"adc %3, %3, r4\n\t"\
|
|
: "+r"(u128_0), "+r"(u128_1), "+r"(u128_2), "+r"(u128_3)\
|
|
: "r"(u32_0)\
|
|
: "cc", "r4"\
|
|
);\
|
|
}
|
|
#endif /*__thumb__*/
|
|
|
|
static void aes_setkey(u8 keyslot, const void *key, u32 keyType, u32 mode)
|
|
{
|
|
if(keyslot <= 0x03) return; // Ignore TWL keys for now
|
|
u32 *key32 = (u32 *)key;
|
|
*REG_AESCNT = (*REG_AESCNT & ~(AES_CNT_INPUT_ENDIAN | AES_CNT_INPUT_ORDER)) | mode;
|
|
*REG_AESKEYCNT = (*REG_AESKEYCNT >> 6 << 6) | keyslot | AES_KEYCNT_WRITE;
|
|
|
|
REG_AESKEYFIFO[keyType] = key32[0];
|
|
REG_AESKEYFIFO[keyType] = key32[1];
|
|
REG_AESKEYFIFO[keyType] = key32[2];
|
|
REG_AESKEYFIFO[keyType] = key32[3];
|
|
}
|
|
|
|
static void aes_use_keyslot(u8 keyslot)
|
|
{
|
|
if(keyslot > 0x3F)
|
|
return;
|
|
|
|
*REG_AESKEYSEL = keyslot;
|
|
*REG_AESCNT = *REG_AESCNT | 0x04000000; /* mystery bit */
|
|
}
|
|
|
|
static void aes_setiv(const void *iv, u32 mode)
|
|
{
|
|
const u32 *iv32 = (const u32 *)iv;
|
|
*REG_AESCNT = (*REG_AESCNT & ~(AES_CNT_INPUT_ENDIAN | AES_CNT_INPUT_ORDER)) | mode;
|
|
|
|
// Word order for IV can't be changed in REG_AESCNT and always default to reversed
|
|
if(mode & AES_INPUT_NORMAL)
|
|
{
|
|
REG_AESCTR[0] = iv32[3];
|
|
REG_AESCTR[1] = iv32[2];
|
|
REG_AESCTR[2] = iv32[1];
|
|
REG_AESCTR[3] = iv32[0];
|
|
}
|
|
else
|
|
{
|
|
REG_AESCTR[0] = iv32[0];
|
|
REG_AESCTR[1] = iv32[1];
|
|
REG_AESCTR[2] = iv32[2];
|
|
REG_AESCTR[3] = iv32[3];
|
|
}
|
|
}
|
|
|
|
static void aes_advctr(void *ctr, u32 val, u32 mode)
|
|
{
|
|
u32 *ctr32 = (u32 *)ctr;
|
|
|
|
int i;
|
|
if(mode & AES_INPUT_BE)
|
|
{
|
|
for(i = 0; i < 4; ++i) // Endian swap
|
|
BSWAP32(ctr32[i]);
|
|
}
|
|
|
|
if(mode & AES_INPUT_NORMAL)
|
|
{
|
|
ADD_u128_u32(ctr32[3], ctr32[2], ctr32[1], ctr32[0], val);
|
|
}
|
|
else
|
|
{
|
|
ADD_u128_u32(ctr32[0], ctr32[1], ctr32[2], ctr32[3], val);
|
|
}
|
|
|
|
if(mode & AES_INPUT_BE)
|
|
{
|
|
for(i = 0; i < 4; ++i) // Endian swap
|
|
BSWAP32(ctr32[i]);
|
|
}
|
|
}
|
|
|
|
static void aes_change_ctrmode(void *ctr, u32 fromMode, u32 toMode)
|
|
{
|
|
u32 *ctr32 = (u32 *)ctr;
|
|
int i;
|
|
if((fromMode ^ toMode) & AES_CNT_INPUT_ENDIAN)
|
|
{
|
|
for(i = 0; i < 4; ++i)
|
|
BSWAP32(ctr32[i]);
|
|
}
|
|
|
|
if((fromMode ^ toMode) & AES_CNT_INPUT_ORDER)
|
|
{
|
|
u32 temp = ctr32[0];
|
|
ctr32[0] = ctr32[3];
|
|
ctr32[3] = temp;
|
|
|
|
temp = ctr32[1];
|
|
ctr32[1] = ctr32[2];
|
|
ctr32[2] = temp;
|
|
}
|
|
}
|
|
|
|
static void aes_batch(void *dst, const void *src, u32 blockCount)
|
|
{
|
|
*REG_AESBLKCNT = blockCount << 16;
|
|
*REG_AESCNT |= AES_CNT_START;
|
|
|
|
const u32 *src32 = (const u32 *)src;
|
|
u32 *dst32 = (u32 *)dst;
|
|
|
|
u32 wbc = blockCount;
|
|
u32 rbc = blockCount;
|
|
|
|
while(rbc)
|
|
{
|
|
if(wbc && ((*REG_AESCNT & 0x1F) <= 0xC)) // There's space for at least 4 ints
|
|
{
|
|
*REG_AESWRFIFO = *src32++;
|
|
*REG_AESWRFIFO = *src32++;
|
|
*REG_AESWRFIFO = *src32++;
|
|
*REG_AESWRFIFO = *src32++;
|
|
wbc--;
|
|
}
|
|
|
|
if(rbc && ((*REG_AESCNT & (0x1F << 0x5)) >= (0x4 << 0x5))) // At least 4 ints available for read
|
|
{
|
|
*dst32++ = *REG_AESRDFIFO;
|
|
*dst32++ = *REG_AESRDFIFO;
|
|
*dst32++ = *REG_AESRDFIFO;
|
|
*dst32++ = *REG_AESRDFIFO;
|
|
rbc--;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void aes(void *dst, const void *src, u32 blockCount, void *iv, u32 mode, u32 ivMode)
|
|
{
|
|
*REG_AESCNT = mode |
|
|
AES_CNT_INPUT_ORDER | AES_CNT_OUTPUT_ORDER |
|
|
AES_CNT_INPUT_ENDIAN | AES_CNT_OUTPUT_ENDIAN |
|
|
AES_CNT_FLUSH_READ | AES_CNT_FLUSH_WRITE;
|
|
|
|
u32 blocks;
|
|
while(blockCount != 0)
|
|
{
|
|
if((mode & AES_ALL_MODES) != AES_ECB_ENCRYPT_MODE
|
|
&& (mode & AES_ALL_MODES) != AES_ECB_DECRYPT_MODE)
|
|
aes_setiv(iv, ivMode);
|
|
|
|
blocks = (blockCount >= 0xFFFF) ? 0xFFFF : blockCount;
|
|
|
|
// Save the last block for the next decryption CBC batch's iv
|
|
if((mode & AES_ALL_MODES) == AES_CBC_DECRYPT_MODE)
|
|
{
|
|
memcpy(iv, src + (blocks - 1) * AES_BLOCK_SIZE, AES_BLOCK_SIZE);
|
|
aes_change_ctrmode(iv, AES_INPUT_BE | AES_INPUT_NORMAL, ivMode);
|
|
}
|
|
|
|
// Process the current batch
|
|
aes_batch(dst, src, blocks);
|
|
|
|
// Save the last block for the next encryption CBC batch's iv
|
|
if((mode & AES_ALL_MODES) == AES_CBC_ENCRYPT_MODE)
|
|
{
|
|
memcpy(iv, dst + (blocks - 1) * AES_BLOCK_SIZE, AES_BLOCK_SIZE);
|
|
aes_change_ctrmode(iv, AES_INPUT_BE | AES_INPUT_NORMAL, ivMode);
|
|
}
|
|
|
|
// Advance counter for CTR mode
|
|
else if((mode & AES_ALL_MODES) == AES_CTR_MODE)
|
|
aes_advctr(iv, blocks, ivMode);
|
|
|
|
src += blocks * AES_BLOCK_SIZE;
|
|
dst += blocks * AES_BLOCK_SIZE;
|
|
blockCount -= blocks;
|
|
}
|
|
}
|
|
|
|
static void sha_wait_idle()
|
|
{
|
|
while(*REG_SHA_CNT & 1);
|
|
}
|
|
|
|
static void sha(void *res, const void *src, u32 size, u32 mode)
|
|
{
|
|
sha_wait_idle();
|
|
*REG_SHA_CNT = mode | SHA_CNT_OUTPUT_ENDIAN | SHA_NORMAL_ROUND;
|
|
|
|
const u32 *src32 = (const u32 *)src;
|
|
int i;
|
|
while(size >= 0x40)
|
|
{
|
|
sha_wait_idle();
|
|
for(i = 0; i < 4; ++i)
|
|
{
|
|
*REG_SHA_INFIFO = *src32++;
|
|
*REG_SHA_INFIFO = *src32++;
|
|
*REG_SHA_INFIFO = *src32++;
|
|
*REG_SHA_INFIFO = *src32++;
|
|
}
|
|
|
|
size -= 0x40;
|
|
}
|
|
|
|
sha_wait_idle();
|
|
memcpy((void *)REG_SHA_INFIFO, src32, size);
|
|
|
|
*REG_SHA_CNT = (*REG_SHA_CNT & ~SHA_NORMAL_ROUND) | SHA_FINAL_ROUND;
|
|
|
|
while(*REG_SHA_CNT & SHA_FINAL_ROUND);
|
|
sha_wait_idle();
|
|
|
|
u32 hashSize = SHA_256_HASH_SIZE;
|
|
if(mode == SHA_224_MODE)
|
|
hashSize = SHA_224_HASH_SIZE;
|
|
else if(mode == SHA_1_MODE)
|
|
hashSize = SHA_1_HASH_SIZE;
|
|
|
|
memcpy(res, (void *)REG_SHA_HASH, hashSize);
|
|
}
|
|
|
|
/****************************************************************
|
|
* NAND/FIRM crypto
|
|
****************************************************************/
|
|
|
|
static u8 nandCTR[0x10],
|
|
nandSlot;
|
|
|
|
static u32 fatStart;
|
|
|
|
//Initialize the CTRNAND crypto
|
|
void ctrNandInit(void)
|
|
{
|
|
u8 cid[0x10];
|
|
u8 shaSum[0x20];
|
|
|
|
sdmmc_get_cid(1, (u32 *)cid);
|
|
sha(shaSum, cid, 0x10, SHA_256_MODE);
|
|
memcpy(nandCTR, shaSum, 0x10);
|
|
|
|
if(console)
|
|
{
|
|
u8 keyY0x5[0x10] = {0x4D, 0x80, 0x4F, 0x4E, 0x99, 0x90, 0x19, 0x46, 0x13, 0xA2, 0x04, 0xAC, 0x58, 0x44, 0x60, 0xBE};
|
|
aes_setkey(0x05, keyY0x5, AES_KEYY, AES_INPUT_BE | AES_INPUT_NORMAL);
|
|
nandSlot = 0x05;
|
|
fatStart = 0x5CAD7;
|
|
}
|
|
else
|
|
{
|
|
nandSlot = 0x04;
|
|
fatStart = 0x5CAE5;
|
|
}
|
|
}
|
|
|
|
//Read and decrypt from the selected CTRNAND
|
|
u32 ctrNandRead(u32 sector, u32 sectorCount, u8 *outbuf)
|
|
{
|
|
u8 tmpCTR[0x10];
|
|
memcpy(tmpCTR, nandCTR, 0x10);
|
|
aes_advctr(tmpCTR, ((sector + fatStart) * 0x200) / AES_BLOCK_SIZE, AES_INPUT_BE | AES_INPUT_NORMAL);
|
|
|
|
//Read
|
|
u32 result;
|
|
if(!firmSource)
|
|
result = sdmmc_nand_readsectors(sector + fatStart, sectorCount, outbuf);
|
|
else
|
|
{
|
|
sector += emuOffset;
|
|
result = sdmmc_sdcard_readsectors(sector + fatStart, sectorCount, outbuf);
|
|
}
|
|
|
|
//Decrypt
|
|
aes_use_keyslot(nandSlot);
|
|
aes(outbuf, outbuf, sectorCount * 0x200 / AES_BLOCK_SIZE, tmpCTR, AES_CTR_MODE, AES_INPUT_BE | AES_INPUT_NORMAL);
|
|
|
|
return result;
|
|
}
|
|
|
|
//Decrypt a FIRM ExeFS
|
|
void decryptExeFs(u8 *inbuf)
|
|
{
|
|
u8 *exeFsOffset = inbuf + *(u32 *)(inbuf + 0x1A0) * 0x200;
|
|
u32 exeFsSize = *(u32 *)(inbuf + 0x1A4) * 0x200;
|
|
u8 ncchCTR[0x10] = {0};
|
|
|
|
for(u32 i = 0; i < 8; i++)
|
|
ncchCTR[7 - i] = *(inbuf + 0x108 + i);
|
|
ncchCTR[8] = 2;
|
|
|
|
aes_setkey(0x2C, inbuf, AES_KEYY, AES_INPUT_BE | AES_INPUT_NORMAL);
|
|
aes_setiv(ncchCTR, AES_INPUT_BE | AES_INPUT_NORMAL);
|
|
aes_use_keyslot(0x2C);
|
|
aes(inbuf - 0x200, exeFsOffset, exeFsSize / AES_BLOCK_SIZE, ncchCTR, AES_CTR_MODE, AES_INPUT_BE | AES_INPUT_NORMAL);
|
|
}
|
|
|
|
//ARM9Loader replacement
|
|
void arm9Loader(u8 *arm9Section, u32 mode)
|
|
{
|
|
//Firm keys
|
|
u8 keyY[0x10],
|
|
arm9BinCTR[0x10],
|
|
arm9BinSlot = mode ? 0x16 : 0x15;
|
|
|
|
//Setup keys needed for arm9bin decryption
|
|
memcpy(keyY, arm9Section + 0x10, 0x10);
|
|
memcpy(arm9BinCTR, arm9Section + 0x20, 0x10);
|
|
|
|
//Calculate the size of the ARM9 binary
|
|
u32 arm9BinSize = 0;
|
|
//http://stackoverflow.com/questions/12791077/atoi-implementation-in-c
|
|
for(u8 *tmp = arm9Section + 0x30; *tmp; tmp++)
|
|
arm9BinSize = (arm9BinSize << 3) + (arm9BinSize << 1) + *tmp - '0';
|
|
|
|
if(mode)
|
|
{
|
|
const u8 key1[0x10] = {0x07, 0x29, 0x44, 0x38, 0xF8, 0xC9, 0x75, 0x93, 0xAA, 0x0E, 0x4A, 0xB4, 0xAE, 0x84, 0xC1, 0xD8},
|
|
key2[0x10] = {0x42, 0x3F, 0x81, 0x7A, 0x23, 0x52, 0x58, 0x31, 0x6E, 0x75, 0x8E, 0x3A, 0x39, 0x43, 0x2E, 0xD0};
|
|
u8 keyX[0x10];
|
|
|
|
aes_setkey(0x11, mode == 1 ? key2 : key1, AES_KEYNORMAL, AES_INPUT_BE | AES_INPUT_NORMAL);
|
|
aes_use_keyslot(0x11);
|
|
aes(keyX, arm9Section + 0x60, 1, NULL, AES_ECB_DECRYPT_MODE, 0);
|
|
aes_setkey(arm9BinSlot, keyX, AES_KEYX, AES_INPUT_BE | AES_INPUT_NORMAL);
|
|
}
|
|
|
|
aes_setkey(arm9BinSlot, keyY, AES_KEYY, AES_INPUT_BE | AES_INPUT_NORMAL);
|
|
aes_setiv(arm9BinCTR, AES_INPUT_BE | AES_INPUT_NORMAL);
|
|
aes_use_keyslot(arm9BinSlot);
|
|
|
|
//Decrypt arm9bin
|
|
aes(arm9Section + 0x800, arm9Section + 0x800, arm9BinSize / AES_BLOCK_SIZE, arm9BinCTR, AES_CTR_MODE, AES_INPUT_BE | AES_INPUT_NORMAL);
|
|
|
|
//Set >=9.6 KeyXs
|
|
if(mode == 1)
|
|
{
|
|
u8 keyData[0x10] = {0xDD, 0xDA, 0xA4, 0xC6, 0x2C, 0xC4, 0x50, 0xE9, 0xDA, 0xB6, 0x9B, 0x0D, 0x9D, 0x2A, 0x21, 0x98},
|
|
decKey[0x10];
|
|
|
|
//Set keys 0x19..0x1F keyXs
|
|
aes_use_keyslot(0x11);
|
|
for(u8 slot = 0x19; slot < 0x20; slot++)
|
|
{
|
|
aes(decKey, keyData, 1, NULL, AES_ECB_DECRYPT_MODE, 0);
|
|
aes_setkey(slot, decKey, AES_KEYX, AES_INPUT_BE | AES_INPUT_NORMAL);
|
|
keyData[0xF] += 1;
|
|
}
|
|
}
|
|
} |