uint8_t* decryptFirmTitleNcch(uint8_t* title, unsigned int size){
ctr_ncchheader NCCH;
uint8_t CTR[16];
PartitionInfo INFO;
NCCH = *((ctr_ncchheader*)title);
if(memcmp(NCCH.magic, "NCCH", 4) != 0) return NULL;
ncch_get_counter(NCCH, CTR, 2);
INFO.ctr = CTR; INFO.buffer = title + getle32(NCCH.exefsoffset)*0x200; INFO.keyY = NCCH.signature; INFO.size = size; INFO.keyslot = 0x2C;
DecryptPartition(&INFO);
uint8_t* firm = (uint8_t*)(INFO.buffer + 0x200);
return firm;
}
int VerifyNCCHSection(USER_CONTEXT *ctx, u8 cxi_key[0x10], u32 offset, FILE *ncch)
{
NCCH_STRUCT *cxi_ctx = malloc(sizeof(NCCH_STRUCT));
if(cxi_ctx == NULL){
printf("[!] Memory Allocation Failure\n");
return Fail;
}
memset(cxi_ctx,0x0,sizeof(NCCH_STRUCT));
GetCXIStruct(cxi_ctx,offset,ncch);
u8 HeaderSignature[0x100];
u8 Header[0x100];
u8 HeaderSHAHash[0x20];
u8 ExHeader[0x800];
memset(&HeaderSignature,0x0,0x100);
memset(&Header,0x0,0x100);
memset(&HeaderSHAHash,0x0,0x20);
fseek(ncch,offset+0x0,SEEK_SET);
fread(HeaderSignature,0x100,1,ncch);
fread(Header,0x100,1,ncch);
ctr_sha(&Header,0x100,HeaderSHAHash,CTR_SHA_256);
RSA_2048_KEY HeaderRSA;
memset(&HeaderRSA,0x0,sizeof(RSA_2048_KEY));
u8 Exponent[0x3] = {0x01,0x00,0x01};
memcpy(HeaderRSA.e,Exponent,0x3);
if(cxi_ctx->is_cfa == True)
memcpy(HeaderRSA.n,ctx->keys.NcsdCfa.n,0x100);
else{
memset(&ExHeader,0x0,0x800);
fseek(ncch,offset+cxi_ctx->exheader_offset,SEEK_SET);
fread(&ExHeader,0x800,1,ncch);
if(cxi_ctx->encrypted == True){
u8 counter[0x10];
ncch_get_counter(cxi_ctx,counter,NCCHTYPE_EXHEADER);
ctr_aes_context aes_ctx;
memset(&aes_ctx,0x0,sizeof(ctr_aes_context));
ctr_init_counter(&aes_ctx, cxi_key, counter);
ctr_crypt_counter(&aes_ctx, ExHeader, ExHeader, 0x800);
if(memcmp((ExHeader+0x200),cxi_ctx->programID,8) != 0){
printf("[!] CXI decryption failed\n");
return Fail;
}
}
memcpy(HeaderRSA.n,ExHeader+0x500,0x100);
}
return ctr_rsa(HeaderSHAHash,HeaderSignature,HeaderRSA.n,NULL,RSA_2048_SHA256,CTR_RSA_VERIFY);
}
uint8_t* decryptFirmTitleNcch(uint8_t* title, size_t *size)
{
const size_t sector = 512;
const size_t header = 512;
ctr_ncchheader NCCH;
uint8_t CTR[16];
PartitionInfo INFO;
NCCH = *((ctr_ncchheader*)title);
if(memcmp(NCCH.magic, "NCCH", 4) != 0) return NULL;
ncch_get_counter(NCCH, CTR, 2);
INFO.ctr = CTR; INFO.buffer = title + getle32(NCCH.exefsoffset)*sector; INFO.keyY = NCCH.signature; INFO.size = getle32(NCCH.exefssize)*sector; INFO.keyslot = 0x2C;
DecryptPartition(&INFO);
if (size != NULL)
*size = INFO.size - header;
uint8_t* firm = (uint8_t*)(INFO.buffer + header);
if (getMpInfo() == MPINFO_KTR)
if (decryptFirmKtrArm9(firm))
return NULL;
return firm;
}
int ProcessCTR(char* path){
PartitionInfo myInfo;
File myFile;
char myString[256]; //In case it is needed...
if(FileOpen(&myFile, path, 0)){
ConsoleInit();
ConsoleAddText(TITLE);
unsigned int ncch_base = 0x100;
unsigned char magic[] = { 0, 0, 0, 0, 0};
FileRead(&myFile, magic, 4, ncch_base);
if(magic[0] == 'N' && magic[1] == 'C' && magic[2] == 'S' && magic[3] == 'D'){
ncch_base = 0x4000;
FileRead(&myFile, magic, 4, ncch_base+0x100);
if(!(magic[0] == 'N' && magic[1] == 'C' && magic[2] == 'C' && magic[3] == 'H')){
FileClose(&myFile);
return 2;
}
}else if(magic[0] == 'N' && magic[1] == 'C' && magic[2] == 'C' && magic[3] == 'H'){
ncch_base = 0x0;
}else{
FileClose(&myFile);
return 2;
}
ctr_ncchheader NCCH; unsigned int mediaunitsize = 0x200;
FileRead(&myFile, &NCCH, 0x200, ncch_base);
//ConsoleAddText(path);
ConsoleAddText(NCCH.productcode);
unsigned int NEWCRYPTO = 0, CRYPTO = 1;
if(NCCH.flags[3] != 0) NEWCRYPTO = 1;
if(NCCH.flags[7] & 4) CRYPTO = 0;
if(NEWCRYPTO){
ConsoleAddText("\nCryptoType : 7.X Key security");
}else if(CRYPTO){
ConsoleAddText("\nCryptoType : Secure");
}else{
ConsoleAddText("\nCryptoType : None");
ConsoleAddText("Decryption completed!");
FileClose(&myFile);
ConsoleShow();
return 3;
}
ConsoleShow();
u8 CTR[16];
if(getle32(NCCH.extendedheadersize) > 0){
ConsoleAddText("Decrypting ExHeader..."); ConsoleShow();
ncch_get_counter(NCCH, CTR, 1);
FileRead(&myFile, BUFFER_ADDR, 0x800, ncch_base + 0x200);
myInfo.buffer = BUFFER_ADDR;
myInfo.size = 0x800;
myInfo.keyslot = 0x2C;
myInfo.ctr = CTR;
myInfo.keyY = NCCH.signature;
DecryptPartition(&myInfo);
FileWrite(&myFile, BUFFER_ADDR, 0x800, ncch_base + 0x200);
}
if(getle32(NCCH.exefssize) > 0){
ConsoleAddText("Decrypting ExeFS..."); ConsoleShow();
ncch_get_counter(NCCH, CTR, 2);
myInfo.buffer = BUFFER_ADDR;
myInfo.keyslot = NEWCRYPTO ? 0x25 : 0x2C;
myInfo.ctr = CTR;
myInfo.keyY = NCCH.signature;
size_t bytesRead = FileRead(&myFile, BUFFER_ADDR, getle32(NCCH.exefssize) * mediaunitsize, ncch_base + getle32(NCCH.exefsoffset) * mediaunitsize);
myInfo.size = bytesRead;
ProcessExeFS(&myInfo); //Explanation at function definition
FileWrite(&myFile, BUFFER_ADDR, getle32(NCCH.exefssize) * mediaunitsize, ncch_base + getle32(NCCH.exefsoffset) * mediaunitsize);
}
if(getle32(NCCH.romfssize) > 0){
ConsoleAddText("Decrypting RomFS..."); ConsoleShow();
ncch_get_counter(NCCH, CTR, 3);
myInfo.buffer = BUFFER_ADDR;
myInfo.keyslot = NEWCRYPTO ? 0x25 : 0x2C;
myInfo.ctr = CTR;
myInfo.keyY = NCCH.signature;
for(int i = 0; i < getle32(NCCH.romfssize) * mediaunitsize / BLOCK_SIZE; i++){
sprintf(myString, "%i%%", (int)((i*BLOCK_SIZE)/(getle32(NCCH.romfssize) * mediaunitsize/ 100)));
int x, y; ConsoleGetXY(&x, &y); y += CHAR_WIDTH * 4; x += CHAR_WIDTH*22;
DrawString(TOP_SCREEN, myString, x, y, ConsoleGetTextColor(), ConsoleGetBackgroundColor());
size_t bytesRead = FileRead(&myFile, BUFFER_ADDR, BLOCK_SIZE, ncch_base + getle32(NCCH.romfsoffset) * mediaunitsize + i*BLOCK_SIZE);
myInfo.size = bytesRead;
DecryptPartition(&myInfo);
add_ctr(myInfo.ctr, bytesRead/16);
FileWrite(&myFile, BUFFER_ADDR, BLOCK_SIZE, ncch_base + getle32(NCCH.romfsoffset) * mediaunitsize + i*BLOCK_SIZE);
}
}
NCCH.flags[7] |= 4; //Disable encryption
NCCH.flags[3] = 0; //Disable 7.XKey usage
FileWrite(&myFile, &NCCH, 0x200, ncch_base);
if(ncch_base == 0x4000) FileWrite(&myFile, ((u8*)&NCCH) + 0x100, 0x100, 0x1100); //Only for NCSD
FileClose(&myFile);
ConsoleAddText("Decryption completed!"); ConsoleShow();
return 0;
}else return 1;
}
