mirror of
https://github.com/jakcron/nstool.git
synced 2024-12-23 11:15:28 +00:00
369 lines
10 KiB
C++
369 lines
10 KiB
C++
#include <cstdio>
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#include <crypto/aes.h>
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#include <fnd/io.h>
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#include <fnd/MemoryBlob.h>
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#include <nx/NXCrypto.h>
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#include <nx/NcaHeader.h>
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#include <inttypes.h>
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#ifdef _WIN32
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#include <direct.h>
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#else
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#include <sys/stat.h>
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#endif
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const size_t kNcaSectorSize = nx::NcaHeader::kBlockSize;
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std::string kFormatVersionStr[]
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{
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"NCA2",
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"NCA3"
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};
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std::string kDistributionTypeStr[]
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{
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"Download",
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"Game Card"
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};
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std::string kContentTypeStr[]
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{
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"Program",
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"Meta",
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"Control",
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"Manual",
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"Data"
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};
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std::string kEncryptionTypeStr[]
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{
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"Auto",
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"None",
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"AesXts",
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"AesCtr",
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"BKTR"
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};
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std::string kHashTypeStr[]
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{
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"Auto",
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"UNKNOWN_1",
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"HierarchicalSha256",
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"HierarchicalIntegrity"
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};
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std::string kFormatTypeStr[]
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{
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"RomFs",
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"PartitionFs"
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};
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std::string kKaekIndexStr[]
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{
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"Application",
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"Ocean",
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"System"
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};
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enum EncryptionType
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{
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CRYPT_AUTO,
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CRYPT_NONE,
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CRYPT_AESXTS,
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CRYPT_AESCTR,
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CRYPT_BKTR
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};
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static const byte_t kNcaMagic[2][4] = {{'N','C','A','2'}, {'N','C','A','3'}};
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enum KeysetType
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{
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KEYSET_DEV,
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KEYSET_PROD
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};
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static const byte_t* kNcaHeaderKey[2][2] =
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{
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{ crypto::aes::nx::dev::nca_header_key[0], crypto::aes::nx::dev::nca_header_key[1] },
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{ crypto::aes::nx::prod::nca_header_key[0], crypto::aes::nx::prod::nca_header_key[1] }
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};
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#pragma pack(push,1)
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struct sNcaFsHeader
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{
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le_uint16_t version; // usually 0x0002
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byte_t format_type; // RomFs(0x00), PartitionFs(0x01)
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byte_t hash_type; // HashTypeAuto(0x00), HashTypeHierarchicalSha256(0x02), HashTypeHierarchicalIntegrity(0x03).RomFs uses (0x03) this is forced, PartitionFs uses (0x02).
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byte_t encryption_type; // EncryptionTypeAuto(0x00), EncryptionTypeNone(0x01), EncryptionTypeAesCtr(0x03)
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byte_t reserved[3];
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};
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#pragma pack(pop)
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inline size_t sectorToOffset(size_t sector_index) { return sector_index * kNcaSectorSize; }
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void initNcaCtr(byte_t ctr[crypto::aes::kAesBlockSize], uint32_t generation)
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{
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memset(ctr, 0, crypto::aes::kAesBlockSize);
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for (size_t i = 0; i < 4; i++)
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{
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ctr[7 - i] = (generation >> i * 8) & 0xff;
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}
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}
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void hexDump(const byte_t* data, size_t len)
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{
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for (size_t i = 0; i < len; i++)
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{
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printf("%02X", data[i]);
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}
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}
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void xorData(const byte_t* a, const byte_t* b, byte_t* out, size_t len)
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{
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for (size_t i = 0; i < len; i++)
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{
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out[i] = a[i] ^ b[i];
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}
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}
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void decryptNcaHeader(byte_t header[0xc00], const byte_t* key[2])
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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[kNcaSectorSize];
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nx::NcaHeader hdr;
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crypto::aes::AesXtsMakeTweak(tweak, 1);
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crypto::aes::AesXtsDecryptSector(header + sectorToOffset(1), kNcaSectorSize, key[0], key[1], tweak, raw_hdr);
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hdr.importBinary(raw_hdr, kNcaSectorSize);
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// decrypt whole header
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for (size_t i = 0; i < 6; i++)
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{
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crypto::aes::AesXtsMakeTweak(tweak, (i > 1 && hdr.getFormatVersion() == nx::NcaHeader::NCA2_FORMAT)? 0 : i);
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crypto::aes::AesXtsDecryptSector(header + sectorToOffset(i), kNcaSectorSize, key[0], key[1], tweak, header + sectorToOffset(i));
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}
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}
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void decryptNcaSectorXts(const fnd::MemoryBlob& nca, byte_t out[kNcaSectorSize], size_t sector, const byte_t* key[2])
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{
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byte_t tweak[crypto::aes::kAesBlockSize];
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crypto::aes::AesXtsMakeTweak(tweak, sector);
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crypto::aes::AesXtsDecryptSector(nca.getBytes() + sectorToOffset(sector), kNcaSectorSize, key[0], key[1], tweak, out);
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}
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void decryptNcaSectorCtr(const fnd::MemoryBlob& nca, byte_t out[kNcaSectorSize], size_t sector, const byte_t* key)
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{
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byte_t ctr[crypto::aes::kAesBlockSize];
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initNcaCtr(ctr, 0);
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crypto::aes::AesIncrementCounter(ctr, (sector*kNcaSectorSize)/crypto::aes::kAesBlockSize, ctr);
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crypto::aes::AesCtr(nca.getBytes() + sector*kNcaSectorSize, kNcaSectorSize, key, ctr, out);
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}
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void dumpNcaSector(byte_t out[kNcaSectorSize])
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{
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for (size_t j = 0; j < kNcaSectorSize / crypto::aes::kAesBlockSize; j++)
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{
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hexDump(out + j * crypto::aes::kAesBlockSize, crypto::aes::kAesBlockSize);
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printf("\n");
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}
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}
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void dumpHxdStyleSector(byte_t* out, size_t len)
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{
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// iterate over 0x10 blocks
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for (size_t i = 0; i < (len / crypto::aes::kAesBlockSize); i++)
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{
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// for block i print each byte
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for (size_t j = 0; j < crypto::aes::kAesBlockSize; j++)
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{
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printf("%02X ", out[i*crypto::aes::kAesBlockSize + j]);
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}
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printf(" ");
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for (size_t j = 0; j < crypto::aes::kAesBlockSize; j++)
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{
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printf("%c", isalnum(out[i*crypto::aes::kAesBlockSize + j]) ? out[i*crypto::aes::kAesBlockSize + j] : '.');
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}
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printf("\n");
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}
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/*
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for (size_t i = 0; i < len % crypto::aes::kAesBlockSize; i++)
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{
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printf("%02X ", out[(len / crypto::aes::kAesBlockSize)*crypto::aes::kAesBlockSize + i]);
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}
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for (size_t i = 0; i < crypto::aes::kAesBlockSize - (len % crypto::aes::kAesBlockSize); i++)
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{
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printf(" ");
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}
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for (size_t i = 0; i < len % crypto::aes::kAesBlockSize; i++)
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{
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printf("%c", out[(len / crypto::aes::kAesBlockSize)*crypto::aes::kAesBlockSize + i]);
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}
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*/
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}
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bool testNcaHeaderKey(const byte_t* header_src, const byte_t* key[2])
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{
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bool validKey = false;
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byte_t header_dec[kNcaSectorSize];
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byte_t tweak[crypto::aes::kAesBlockSize];
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// try key
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crypto::aes::AesXtsMakeTweak(tweak, 1);
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crypto::aes::AesXtsDecryptSector(header_src + sectorToOffset(1), kNcaSectorSize, key[0], key[1], tweak, header_dec);
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if (memcmp(header_dec, kNcaMagic[0], 4) == 0 || memcmp(header_dec, kNcaMagic[1], 4) == 0)
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{
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validKey = true;
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}
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return validKey;
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}
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KeysetType getKeysetFromNcaHeader(const byte_t* header_src)
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{
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for (int i = 0; i < 2; i++)
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{
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if (testNcaHeaderKey(header_src, kNcaHeaderKey[i]) == true)
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{
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return (KeysetType)i;
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}
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}
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throw fnd::Exception("Failed to determine NCA header key");
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}
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int main(int argc, char** argv)
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{
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if (argc < 2)
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{
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printf("usage: ncatool <nca file>\n");
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return 1;
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}
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try
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{
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fnd::MemoryBlob nca;
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fnd::io::readFile(argv[1], nca);
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KeysetType keyset = getKeysetFromNcaHeader(nca.getBytes());
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decryptNcaHeader(nca.getBytes(), kNcaHeaderKey[keyset]);
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//dumpHxdStyleSector(nca.getBytes(), 0xc00);
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// nca test
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if (argc == 2 || argc == 3)
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{
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//decryptNcaSectorXts(nca, sector, 1, crypto::aes::nx::dev::nca_header_key[0], crypto::aes::nx::dev::nca_header_key[1]);
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nx::NcaHeader hdr;
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hdr.importBinary(nca.getBytes() + sectorToOffset(1), kNcaSectorSize);
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printf("[NCA Header]\n");
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printf(" Format Type: %s\n", kFormatVersionStr[hdr.getFormatVersion()].c_str());
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printf(" Dist. Type: %s\n", kDistributionTypeStr[hdr.getDistributionType()].c_str());
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printf(" Type: %s\n", kContentTypeStr[hdr.getContentType()].c_str());
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printf(" Crypto Type: %d\n", hdr.getCryptoType());
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printf(" Kaek Index: %s (%d)\n", kKaekIndexStr[hdr.getKaekIndex()].c_str(), hdr.getKaekIndex());
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printf(" Size: 0x%" PRIx64 "\n", hdr.getNcaSize());
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printf(" ProgID: 0x%016" PRIx64 "\n", hdr.getProgramId());
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printf(" Content. Idx: %" PRIu32 "\n", hdr.getContentIndex());
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uint32_t ver = hdr.getSdkAddonVersion();
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printf(" SdkAddon Ver.: v%d.%d.%d.%d (v%" PRIu32 ")\n", (ver>>24 & 0xff),(ver>>16 & 0xff),(ver>>8 & 0xff),(ver>>0 & 0xff), ver);
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printf(" Encrypted Key Area:\n");
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for (size_t i = 0; i < hdr.getEncAesKeys().getSize(); i++)
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{
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printf(" %lu: ", i);
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hexDump(hdr.getEncAesKeys()[i].key, crypto::aes::kAes128KeySize);
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printf("\n");
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/*
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byte_t key[crypto::aes::kAes128KeySize];
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crypto::aes::AesEcbDecrypt(hdr.getEncAesKeys()[i].key, crypto::aes::kAes128KeySize, crypto::aes::nx::dev::key_area_encryption_key_0, key);
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printf(" dec: ", i);
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hexDump(key, crypto::aes::kAes128KeySize);
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printf("\n");
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*/
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}
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printf(" Sections:\n");
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for (size_t i = 0; i < hdr.getSections().getSize(); i++)
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{
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const nx::NcaHeader::sSection& section = hdr.getSections()[i];
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printf(" %lu:\n", i);
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//printf(" Start Blk: %" PRId32 "\n", section.start_blk);
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//printf(" End Blk: %" PRId32 "\n", section.end_blk);
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printf(" Offset: 0x%" PRIx64 "\n", section.offset);
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printf(" Size: 0x%" PRIx64 "\n", section.size);
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size_t sector_index = 1 + (hdr.getSections().getSize() - i);
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byte_t hash[crypto::sha::kSha256HashLen];
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crypto::sha::Sha256(nca.getBytes() + sectorToOffset(sector_index), kNcaSectorSize, hash);
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if (section.hash.compare(hash) == false)
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{
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throw fnd::Exception("ncatool", "NcaFsHeader has bad sha256 hash");
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}
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const sNcaFsHeader* fsHdr = (const sNcaFsHeader*)(nca.getBytes() + sectorToOffset(sector_index));
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printf(" FsHeader:\n");
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printf(" Version: 0x%d\n", fsHdr->version.get());
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printf(" Format Type: %s\n", kFormatTypeStr[fsHdr->format_type].c_str());
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printf(" Hash Type: %s\n", kHashTypeStr[fsHdr->hash_type].c_str());
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printf(" Enc. Type: %s\n", kEncryptionTypeStr[fsHdr->encryption_type].c_str());
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/*
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printf(" Hash: ");
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hexDump(section.hash.bytes, crypto::sha::kSha256HashLen);
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printf("\n");
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byte_t hash[crypto::sha::kSha256HashLen];
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crypto::sha::Sha256(nca.getBytes() + sectorToOffset(sector_index), kNcaSectorSize, hash);
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printf(" Hash: ");
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hexDump(hash, crypto::sha::kSha256HashLen);
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printf("\n");
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*/
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//dumpHxdStyleSector(nca.getBytes() + sectorToOffset(sector_index), 0x10);
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}
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#ifdef USE_OLD_CODE
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if (argc == 3)
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{
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#ifdef _WIN32
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_mkdir(argv[2]);
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#else
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mkdir(argv[2], S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
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#endif
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for (size_t i = 0; i < hdr.getSections().getSize(); i++)
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{
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const nx::NcaHeader::sSection& section = hdr.getSections()[i];
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#ifdef _WIN32
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fnd::io::writeFile(std::string(argv[2]) + "\\" + std::to_string(i) + ".bin" , nca.getBytes() + section.offset, section.size);
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#else
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fnd::io::writeFile(std::string(argv[2]) + "/" + std::to_string(i) + ".bin", nca.getBytes() + section.offset, section.size);
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#endif
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}
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}
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}
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if (argc == 4)
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{
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printf("decrypt test\n");
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byte_t sect[kNcaSectorSize];;
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for (size_t i = 0; i < 6; i++)
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{
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decryptNcaSectorXts(nca, sect, i, crypto::aes::nx::dev::nca_header_key[0], crypto::aes::nx::dev::nca_header_key[1]);
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dumpNcaSector(sect);
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}
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}
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#endif
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}
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} catch (const fnd::Exception& e)
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{
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printf("%s\n",e.what());
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}
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return 0;
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} |