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