mirror of
https://github.com/jakcron/nstool
synced 2024-11-26 23:49:36 +00:00
58 lines
No EOL
1.4 KiB
C++
58 lines
No EOL
1.4 KiB
C++
#include <nn/hac/NcaUtils.h>
|
|
|
|
void nn::hac::NcaUtils::decryptNcaHeader(const byte_t* src, byte_t* dst, const fnd::aes::sAesXts128Key& key)
|
|
{
|
|
byte_t tweak[fnd::aes::kAesBlockSize];
|
|
|
|
// decrypt main header
|
|
byte_t raw_hdr[nn::hac::nca::kSectorSize];
|
|
fnd::aes::AesXtsMakeTweak(tweak, 1);
|
|
fnd::aes::AesXtsDecryptSector(src + sectorToOffset(1), nn::hac::nca::kSectorSize, key.key[0], key.key[1], tweak, raw_hdr);
|
|
|
|
bool useNca2SectorIndex = ((nn::hac::sNcaHeader*)(raw_hdr))->st_magic.get() == nn::hac::nca::kNca2StructMagic;
|
|
|
|
// decrypt whole header
|
|
for (size_t i = 0; i < nn::hac::nca::kHeaderSectorNum; i++)
|
|
{
|
|
fnd::aes::AesXtsMakeTweak(tweak, (i > 1 && useNca2SectorIndex)? 0 : i);
|
|
fnd::aes::AesXtsDecryptSector(src + sectorToOffset(i), nn::hac::nca::kSectorSize, key.key[0], key.key[1], tweak, dst + sectorToOffset(i));
|
|
}
|
|
}
|
|
|
|
byte_t nn::hac::NcaUtils::getMasterKeyRevisionFromKeyGeneration(byte_t key_generation)
|
|
{
|
|
byte_t masterkey_rev;
|
|
|
|
switch (key_generation)
|
|
{
|
|
case(0):
|
|
case(1):
|
|
masterkey_rev = 0;
|
|
break;
|
|
case(2):
|
|
masterkey_rev = 1;
|
|
break;
|
|
case(3):
|
|
masterkey_rev = 2;
|
|
break;
|
|
case(4):
|
|
masterkey_rev = 3;
|
|
break;
|
|
case(5):
|
|
masterkey_rev = 4;
|
|
break;
|
|
default:
|
|
masterkey_rev = key_generation - 1;
|
|
}
|
|
|
|
return masterkey_rev;
|
|
}
|
|
|
|
void nn::hac::NcaUtils::getNcaPartitionAesCtr(const nn::hac::sNcaFsHeader* hdr, byte_t* ctr)
|
|
{
|
|
for (size_t i = 0; i < 8; i++)
|
|
{
|
|
ctr[7-i] = hdr->aes_ctr_upper[i];
|
|
ctr[15-i] = 0;
|
|
}
|
|
} |