mirror of
https://github.com/jakcron/nstool
synced 2024-11-23 05:59:29 +00:00
49 lines
No EOL
1.2 KiB
C++
49 lines
No EOL
1.2 KiB
C++
#include <nx/NcaUtils.h>
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void nx::NcaUtils::decryptNcaHeader(const byte_t* src, byte_t* dst, const crypto::aes::sAesXts128Key& key)
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{
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byte_t tweak[crypto::aes::kAesBlockSize];
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// decrypt main header
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byte_t raw_hdr[nx::nca::kSectorSize];
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crypto::aes::AesXtsMakeTweak(tweak, 1);
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crypto::aes::AesXtsDecryptSector(src + sectorToOffset(1), nx::nca::kSectorSize, key.key[0], key.key[1], tweak, raw_hdr);
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bool useNca2SectorIndex = memcmp(((nx::sNcaHeader*)(raw_hdr))->signature, nx::nca::kNca2Sig.c_str(), 4) == 0;
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// decrypt whole header
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for (size_t i = 0; i < nx::nca::kHeaderSectorNum; i++)
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{
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crypto::aes::AesXtsMakeTweak(tweak, (i > 1 && useNca2SectorIndex)? 0 : i);
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crypto::aes::AesXtsDecryptSector(src + sectorToOffset(i), nx::nca::kSectorSize, key.key[0], key.key[1], tweak, dst + sectorToOffset(i));
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}
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}
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byte_t nx::NcaUtils::getMasterKeyRevisionFromKeyGeneration(byte_t key_generation)
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{
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byte_t masterkey_rev;
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switch (key_generation)
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{
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case(0):
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case(1):
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masterkey_rev = 0;
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break;
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case(2):
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masterkey_rev = 1;
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break;
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case(3):
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masterkey_rev = 2;
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break;
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case(4):
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masterkey_rev = 3;
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break;
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case(5):
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masterkey_rev = 4;
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break;
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default:
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masterkey_rev = key_generation - 1;
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}
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return masterkey_rev;
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} |