├── .gitattributes ├── .gitignore ├── GCDTool.sln ├── GCDTool ├── AesKeyScrambler.cs ├── Blowfish.cs ├── CommandLineOptions.cs ├── Elf │ ├── ElfFile.cs │ ├── ElfHeader.cs │ ├── ElfSectionType.cs │ ├── ProgramHeaderTableEntry.cs │ ├── SectionHeaderTableEntry.cs │ └── Sections │ │ ├── ElfSection.cs │ │ ├── ElfSectionFactory.cs │ │ ├── ElfStrtab.cs │ │ ├── ElfSymbol.cs │ │ └── ElfSymtab.cs ├── GCDTool.csproj ├── GcdBlowfish.cs ├── GcdHeader.cs ├── GcdHeaderFlags.cs ├── GcdRom.cs ├── GcdSignature.cs ├── IO │ ├── EndianBinaryReader.cs │ ├── Endianness.cs │ └── IOUtil.cs ├── Program.cs └── Wram │ ├── NtrWramMaster.cs │ ├── WramABlockMapping.cs │ ├── WramAMappedSlots.cs │ ├── WramAMapping.cs │ ├── WramAMaster.cs │ ├── WramASlot.cs │ ├── WramBBlockMapping.cs │ ├── WramBCMappedSlots.cs │ ├── WramBCMapping.cs │ ├── WramBCSlot.cs │ ├── WramBMaster.cs │ ├── WramCBlockMapping.cs │ ├── WramCMaster.cs │ ├── WramConfig.cs │ └── WramConfigJsonReader.cs └── readme.md /.gitattributes: -------------------------------------------------------------------------------- 1 | ############################################################################### 2 | # Set default behavior to automatically normalize line endings. 3 | ############################################################################### 4 | * text=auto 5 | 6 | ############################################################################### 7 | # Set default behavior for command prompt diff. 8 | # 9 | # This is need for earlier builds of msysgit that does not have it on by 10 | # default for csharp files. 11 | # Note: This is only used by command line 12 | ############################################################################### 13 | #*.cs diff=csharp 14 | 15 | ############################################################################### 16 | # Set the merge driver for project and solution files 17 | # 18 | # Merging from the command prompt will add diff markers to the files if there 19 | # are conflicts (Merging from VS is not affected by the settings below, in VS 20 | # the diff markers are never inserted). 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2 | 3 | namespace GCDTool; 4 | 5 | /// 6 | /// Static class implementing the DSi AES key scrambler. 7 | /// 8 | public static class AesKeyScrambler 9 | { 10 | private static readonly UInt128 scramblerMagic = new(0xFFFEFB4E29590258ul, 0x2A680F5F1A4F3E79ul); 11 | 12 | private const int SCRAMBLER_ROL = 42; 13 | 14 | /// 15 | /// Scrambles the given and . 16 | /// 17 | /// Input key X. 18 | /// Input key Y. 19 | /// The scrambled key. 20 | public static byte[] Scramble(ReadOnlySpan keyX, ReadOnlySpan keyY) 21 | { 22 | UInt128 scrambledKey = Scramble( 23 | BinaryPrimitives.ReadUInt128LittleEndian(keyX), 24 | BinaryPrimitives.ReadUInt128LittleEndian(keyY)); 25 | var result = new byte[16]; 26 | BinaryPrimitives.WriteUInt128LittleEndian(result, scrambledKey); 27 | return result; 28 | } 29 | 30 | /// 31 | /// Scrambles the given and . 32 | /// 33 | /// Input key X. 34 | /// Input key Y. 35 | /// The scrambled key. 36 | public static UInt128 Scramble(UInt128 keyX, UInt128 keyY) 37 | { 38 | return UInt128.RotateLeft((keyX ^ keyY) + scramblerMagic, SCRAMBLER_ROL); 39 | } 40 | } -------------------------------------------------------------------------------- /GCDTool/Blowfish.cs: -------------------------------------------------------------------------------- 1 | using GCDTool.IO; 2 | 3 | namespace GCDTool; 4 | 5 | /// 6 | /// Class for performing Blowfish encryption and decryption. 7 | /// 8 | public sealed class Blowfish 9 | { 10 | public const int BLOCK_LENGTH = 8; 11 | public const int KEY_TABLE_LENGTH = 0x1048; 12 | public const int P_TABLE_ENTRY_COUNT = 18; 13 | public const int S_BOX_COUNT = 4; 14 | public const int S_BOX_ENTRY_COUNT = 256; 15 | 16 | private const string DATA_LENGTH_NOT_MULTIPLE_OF_8_EXCEPTION_MESSAGE = "Data length must be a multiple of 8."; 17 | private const string DESTINATION_BUFFER_TOO_SMALL_EXCEPTION_MESSAGE = "Not enough space in destination buffer."; 18 | 19 | private readonly uint[] _pTable; 20 | private readonly uint[][] _sBoxes; 21 | 22 | public Blowfish(uint[] pTable, uint[][] sBoxes) 23 | { 24 | if (pTable.Length != P_TABLE_ENTRY_COUNT) 25 | { 26 | throw new ArgumentException($"Size of p table should be {P_TABLE_ENTRY_COUNT}", nameof(pTable)); 27 | } 28 | 29 | if (sBoxes.Length != S_BOX_COUNT) 30 | { 31 | throw new ArgumentException($"Number of s boxes should be {S_BOX_COUNT}", nameof(sBoxes)); 32 | } 33 | 34 | for (int i = 0; i < S_BOX_COUNT; i++) 35 | { 36 | if (sBoxes[i].Length != S_BOX_ENTRY_COUNT) 37 | { 38 | throw new ArgumentException($"Size of s box {i} should be {S_BOX_ENTRY_COUNT}", nameof(sBoxes)); 39 | } 40 | } 41 | 42 | _pTable = pTable; 43 | _sBoxes = sBoxes; 44 | } 45 | 46 | public Blowfish(ReadOnlySpan keyTable) 47 | { 48 | if (keyTable.Length < KEY_TABLE_LENGTH) 49 | { 50 | throw new ArgumentException(nameof(keyTable)); 51 | } 52 | 53 | _pTable = IOUtil.ReadU32Le(keyTable, P_TABLE_ENTRY_COUNT); 54 | _sBoxes = new uint[S_BOX_COUNT][]; 55 | _sBoxes[0] = IOUtil.ReadU32Le(keyTable[0x48..], S_BOX_ENTRY_COUNT); 56 | _sBoxes[1] = IOUtil.ReadU32Le(keyTable[0x448..], S_BOX_ENTRY_COUNT); 57 | _sBoxes[2] = IOUtil.ReadU32Le(keyTable[0x848..], S_BOX_ENTRY_COUNT); 58 | _sBoxes[3] = IOUtil.ReadU32Le(keyTable[0xC48..], S_BOX_ENTRY_COUNT); 59 | } 60 | 61 | /// 62 | /// Encrypts bytes of data in the given buffer 63 | /// starting at . must be a multiple of 8. 64 | /// 65 | /// The data buffer. 66 | /// The offset in the buffer to start encrypting. 67 | /// The number of bytes to encrypt. Should be a multiple of 8. 68 | public void Encrypt(byte[] data, int offset, int length) 69 | { 70 | Encrypt(data.AsSpan(offset, length)); 71 | } 72 | 73 | /// 74 | /// Encrypts the data in the given span in place. 75 | /// The length of the span must be a multiple of 8. 76 | /// 77 | /// The data to encrypt. 78 | public void Encrypt(Span data) 79 | { 80 | ThrowIfDataLengthNotMultipleOf8(data.Length, nameof(data)); 81 | 82 | for (int i = 0; i < data.Length; i += BLOCK_LENGTH) 83 | { 84 | ulong val = Encrypt(IOUtil.ReadU64Le(data[i..])); 85 | IOUtil.WriteU64Le(data[i..], val); 86 | } 87 | } 88 | 89 | /// 90 | /// Encrypts a single 64 bit value. 91 | /// 92 | /// The value to encrypt. 93 | /// The encrypted value. 94 | public ulong Encrypt(ulong val) 95 | { 96 | uint y = (uint)(val & 0xFFFFFFFF); 97 | uint x = (uint)(val >> 32); 98 | for (int i = 0; i < 16; i++) 99 | { 100 | uint z = _pTable[i] ^ x; 101 | uint a = _sBoxes[0][z >> 24 & 0xFF]; 102 | uint b = _sBoxes[1][z >> 16 & 0xFF]; 103 | uint c = _sBoxes[2][z >> 8 & 0xFF]; 104 | uint d = _sBoxes[3][z & 0xFF]; 105 | x = d + (c ^ b + a) ^ y; 106 | y = z; 107 | } 108 | 109 | return x ^ _pTable[16] | (ulong)(y ^ _pTable[17]) << 32; 110 | } 111 | 112 | /// 113 | /// Decrypts bytes of data starting as in 114 | /// and writes it to starting from . 115 | /// must be a multiple of 8. 116 | /// 117 | /// The buffer containing the data to decrypt. 118 | /// The offset in where the encrypted data starts. 119 | /// The amount of data to decrypt. Should be a multiple of 8 120 | /// The buffer to write the decrypted data to. 121 | /// The offset in where the decrypted data should be written. 122 | public void Decrypt(byte[] src, int srcOffset, int length, byte[] dst, int dstOffset) 123 | { 124 | Decrypt(src.AsSpan(srcOffset, length), dst.AsSpan(dstOffset, length)); 125 | } 126 | 127 | /// 128 | /// Decrypts the data in the given span in place. 129 | /// The length of the span must be a multiple of 8. 130 | /// 131 | /// The data to decrypt. 132 | public void Decrypt(Span data) 133 | { 134 | Decrypt(data, data); 135 | } 136 | 137 | /// 138 | /// Decrypts the data in the given span and writes it to the span. 139 | /// The length of the span must be a multiple of 8. 140 | /// must have a length equal to or larger than . 141 | /// 142 | /// The data to decrypt. 143 | /// The span to write the decrypted data to. 144 | public void Decrypt(ReadOnlySpan src, Span dst) 145 | { 146 | ThrowIfDataLengthNotMultipleOf8(src.Length, nameof(src)); 147 | 148 | if (dst.Length < src.Length) 149 | { 150 | throw new ArgumentException(DESTINATION_BUFFER_TOO_SMALL_EXCEPTION_MESSAGE, nameof(dst)); 151 | } 152 | 153 | for (int i = 0; i < src.Length; i += BLOCK_LENGTH) 154 | { 155 | ulong val = Decrypt(IOUtil.ReadU64Le(src[i..])); 156 | IOUtil.WriteU64Le(dst[i..], val); 157 | } 158 | } 159 | 160 | /// 161 | /// Decrypts a single 64 bit value. 162 | /// 163 | /// The value to decrypt. 164 | /// The decrypted value. 165 | public ulong Decrypt(ulong val) 166 | { 167 | uint y = (uint)(val & 0xFFFFFFFF); 168 | uint x = (uint)(val >> 32); 169 | for (int i = 17; i >= 2; i--) 170 | { 171 | uint z = _pTable[i] ^ x; 172 | uint a = _sBoxes[0][z >> 24 & 0xFF]; 173 | uint b = _sBoxes[1][z >> 16 & 0xFF]; 174 | uint c = _sBoxes[2][z >> 8 & 0xFF]; 175 | uint d = _sBoxes[3][z & 0xFF]; 176 | x = d + (c ^ b + a) ^ y; 177 | y = z; 178 | } 179 | 180 | return x ^ _pTable[1] | (ulong)(y ^ _pTable[0]) << 32; 181 | } 182 | 183 | private void ThrowIfDataLengthNotMultipleOf8(int dataLength, string paramName) 184 | { 185 | if ((dataLength & 7) != 0) 186 | { 187 | throw new ArgumentException(DATA_LENGTH_NOT_MULTIPLE_OF_8_EXCEPTION_MESSAGE, paramName); 188 | } 189 | } 190 | } -------------------------------------------------------------------------------- /GCDTool/CommandLineOptions.cs: -------------------------------------------------------------------------------- 1 | using CommandLine; 2 | 3 | namespace GCDTool; 4 | 5 | /// 6 | /// Class containing the command line options of GCDTool. 7 | /// 8 | sealed class CommandLineOptions 9 | { 10 | [Option("arm9", Required = true, HelpText = "ARM9 elf file path.")] 11 | public required string Arm9Path { get; init; } 12 | 13 | [Option("arm7", Required = true, HelpText = "ARM7 elf file path.")] 14 | public required string Arm7Path { get; init; } 15 | 16 | [Option("wram", Required = true, HelpText = "Initial WRAM configuration json file path.")] 17 | public required string WramConfigJsonPath { get; init; } 18 | 19 | [Option("rsakey", Required = true, HelpText = "GCD RSA private key der file path.")] 20 | public required string GcdKeyPath { get; init; } 21 | 22 | [Option("gamecode", Default = "####", Required = false, HelpText = "The gamecode to use.")] 23 | public required string GameCode { get; init; } 24 | 25 | [Option("arm9-67-mhz", Default = false, Required = false, HelpText = "When true, the ARM9 will start at 67 MHz instead of 134 MHz.")] 26 | public bool Arm9Speed67MHz { get; init; } 27 | 28 | [Value(0, MetaName = "output path", Required = true, HelpText = "The path of the gcd file to create.")] 29 | public required string OutputPath { get; init; } 30 | } 31 | -------------------------------------------------------------------------------- /GCDTool/Elf/ElfFile.cs: -------------------------------------------------------------------------------- 1 | using GCDTool.Elf.Sections; 2 | using GCDTool.IO; 3 | 4 | namespace GCDTool.Elf; 5 | 6 | sealed class ElfFile 7 | { 8 | public ElfFile(byte[] data) 9 | { 10 | var er = new EndianBinaryReader(new MemoryStream(data), Endianness.LittleEndian); 11 | Header = new ElfHeader(er); 12 | 13 | er.BaseStream.Position = Header.ProgramHeaderTableOffset; 14 | ProgramHeaderTable = new ProgramHeaderTableEntry[Header.ProgramHeaderTableEntryCount]; 15 | for (int i = 0; i < Header.ProgramHeaderTableEntryCount; i++) 16 | { 17 | ProgramHeaderTable[i] = new ProgramHeaderTableEntry(er); 18 | } 19 | 20 | er.BaseStream.Position = Header.SectionHeaderTableOffset; 21 | SectionHeaderTable = new SectionHeaderTableEntry[Header.SectionHeaderTableEntryCount]; 22 | for (int i = 0; i < Header.SectionHeaderTableEntryCount; i++) 23 | { 24 | SectionHeaderTable[i] = new SectionHeaderTableEntry(er); 25 | } 26 | 27 | er.Close(); 28 | 29 | var namestab = new ElfStrtab(SectionHeaderTable[Header.SectionNamesIndex], string.Empty); 30 | Sections = new ElfSection[SectionHeaderTable.Length]; 31 | var sectionFactory = new ElfSectionFactory(); 32 | for (int i = 0; i < SectionHeaderTable.Length; i++) 33 | { 34 | Sections[i] = sectionFactory.CreateElfSection(SectionHeaderTable[i], 35 | namestab.GetString(SectionHeaderTable[i].NameOffset)); 36 | } 37 | } 38 | 39 | public ElfHeader Header; 40 | 41 | public ProgramHeaderTableEntry[] ProgramHeaderTable; 42 | 43 | public SectionHeaderTableEntry[] SectionHeaderTable; 44 | 45 | public ElfSection[] Sections { get; } 46 | 47 | public ElfSection? GetSectionByName(string name) 48 | { 49 | return Sections.FirstOrDefault(section => section.Name == name); 50 | } 51 | } 52 | -------------------------------------------------------------------------------- /GCDTool/Elf/ElfHeader.cs: -------------------------------------------------------------------------------- 1 | using GCDTool.IO; 2 | 3 | namespace GCDTool.Elf; 4 | 5 | sealed class ElfHeader 6 | { 7 | private const uint ElfHeaderMagic = 0x464C457F; 8 | 9 | public ElfHeader(EndianBinaryReader er) 10 | { 11 | Magic = er.Read(); 12 | if (Magic != ElfHeaderMagic) 13 | { 14 | throw new InvalidDataException("Elf magic invalid!"); 15 | } 16 | 17 | BitFormat = er.Read(); 18 | Endianness = er.Read(); 19 | Version = er.Read(); 20 | Abi = er.Read(); 21 | AbiVersion = er.Read(); 22 | Padding = er.Read(7); 23 | ObjectType = er.Read(); 24 | Architecture = er.Read(); 25 | Version2 = er.Read(); 26 | EntryPoint = er.Read(); 27 | ProgramHeaderTableOffset = er.Read(); 28 | SectionHeaderTableOffset = er.Read(); 29 | Flags = er.Read(); 30 | HeaderSize = er.Read(); 31 | ProgramHeaderTableEntrySize = er.Read(); 32 | ProgramHeaderTableEntryCount = er.Read(); 33 | SectionHeaderTableEntrySize = er.Read(); 34 | SectionHeaderTableEntryCount = er.Read(); 35 | SectionNamesIndex = er.Read(); 36 | } 37 | 38 | public uint Magic; 39 | public byte BitFormat; 40 | public byte Endianness; 41 | public byte Version; 42 | public byte Abi; 43 | public byte AbiVersion; 44 | public byte[] Padding;//7 45 | public ushort ObjectType; 46 | public ushort Architecture; 47 | public uint Version2; 48 | public uint EntryPoint; 49 | public uint ProgramHeaderTableOffset; 50 | public uint SectionHeaderTableOffset; 51 | public uint Flags; 52 | public ushort HeaderSize; 53 | public ushort ProgramHeaderTableEntrySize; 54 | public ushort ProgramHeaderTableEntryCount; 55 | public ushort SectionHeaderTableEntrySize; 56 | public ushort SectionHeaderTableEntryCount; 57 | public ushort SectionNamesIndex; 58 | } -------------------------------------------------------------------------------- /GCDTool/Elf/ElfSectionType.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Elf; 2 | 3 | enum ElfSectionType : uint 4 | { 5 | Null = 0, 6 | Progbits = 1, 7 | Symtab = 2, 8 | Strtab = 3, 9 | Rela = 4, 10 | Hash = 5, 11 | Dynamic = 6, 12 | Note = 7, 13 | Nobits = 8, 14 | Rel = 9, 15 | Shlib = 10, 16 | Dynsym = 11, 17 | InitArray = 14, 18 | FiniArray = 15, 19 | PreinitArray = 16, 20 | Group = 17, 21 | SymtabShndx = 18, 22 | Num = 19, 23 | Loos = 0x60000000, 24 | Hios = 0x6fffffff, 25 | Loproc = 0x70000000, 26 | Hiproc = 0x7fffffff, 27 | Louser = 0x80000000, 28 | Hiuser = 0xffffffff 29 | } -------------------------------------------------------------------------------- /GCDTool/Elf/ProgramHeaderTableEntry.cs: -------------------------------------------------------------------------------- 1 | using GCDTool.IO; 2 | 3 | namespace GCDTool.Elf; 4 | 5 | sealed class ProgramHeaderTableEntry 6 | { 7 | public enum ElfSegmentType : uint 8 | { 9 | Null = 0, 10 | Load = 1, 11 | Dynamic = 2, 12 | Interp = 3, 13 | Note = 4, 14 | Shlib = 5, 15 | Phdr = 6, 16 | Tls = 7, 17 | Num = 8, 18 | Loos = 0x60000000, 19 | Hios = 0x6fffffff, 20 | Loproc = 0x70000000, 21 | Hiproc = 0x7fffffff 22 | } 23 | 24 | public ProgramHeaderTableEntry(EndianBinaryReader er) 25 | { 26 | SegmentType = er.Read(); 27 | FileImageOffset = er.Read(); 28 | VirtualAddress = er.Read(); 29 | PhysicalAddress = er.Read(); 30 | FileImageSize = er.Read(); 31 | MemorySize = er.Read(); 32 | Flags = er.Read(); 33 | Alignment = er.Read(); 34 | 35 | if (FileImageSize != 0) 36 | { 37 | long curpos = er.BaseStream.Position; 38 | er.BaseStream.Position = FileImageOffset; 39 | SegmentData = er.Read((int)FileImageSize); 40 | er.BaseStream.Position = curpos; 41 | } 42 | } 43 | 44 | public ElfSegmentType SegmentType; 45 | public uint FileImageOffset; 46 | public uint VirtualAddress; 47 | public uint PhysicalAddress; 48 | public uint FileImageSize; 49 | public uint MemorySize; 50 | public uint Flags; 51 | public uint Alignment; 52 | 53 | public byte[] SegmentData = []; 54 | } 55 | -------------------------------------------------------------------------------- /GCDTool/Elf/SectionHeaderTableEntry.cs: -------------------------------------------------------------------------------- 1 | using GCDTool.IO; 2 | 3 | namespace GCDTool.Elf; 4 | 5 | sealed class SectionHeaderTableEntry 6 | { 7 | public SectionHeaderTableEntry(EndianBinaryReader er) 8 | { 9 | NameOffset = er.Read(); 10 | SectionType = er.Read(); 11 | Flags = er.Read(); 12 | VirtualAddress = er.Read(); 13 | FileImageOffset = er.Read(); 14 | FileImageSize = er.Read(); 15 | Link = er.Read(); 16 | Info = er.Read(); 17 | Alignment = er.Read(); 18 | EntrySize = er.Read(); 19 | 20 | if (FileImageSize != 0) 21 | { 22 | long curpos = er.BaseStream.Position; 23 | er.BaseStream.Position = FileImageOffset; 24 | SectionData = er.Read((int)FileImageSize); 25 | er.BaseStream.Position = curpos; 26 | } 27 | } 28 | 29 | public uint NameOffset; 30 | public ElfSectionType SectionType; 31 | public uint Flags; 32 | public uint VirtualAddress; 33 | public uint FileImageOffset; 34 | public uint FileImageSize; 35 | public uint Link; 36 | public uint Info; 37 | public uint Alignment; 38 | public uint EntrySize; 39 | 40 | public byte[] SectionData = []; 41 | } 42 | -------------------------------------------------------------------------------- /GCDTool/Elf/Sections/ElfSection.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Elf.Sections; 2 | 3 | class ElfSection 4 | { 5 | public SectionHeaderTableEntry SectionHeader { get; } 6 | public string Name { get; } 7 | 8 | public ElfSection(SectionHeaderTableEntry sectionHeader, string name) 9 | { 10 | SectionHeader = sectionHeader; 11 | Name = name; 12 | } 13 | 14 | public override string ToString() 15 | { 16 | return Name; 17 | } 18 | } 19 | -------------------------------------------------------------------------------- /GCDTool/Elf/Sections/ElfSectionFactory.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Elf.Sections; 2 | 3 | sealed class ElfSectionFactory 4 | { 5 | public ElfSection CreateElfSection(SectionHeaderTableEntry section, string name) 6 | { 7 | return section.SectionType switch 8 | { 9 | ElfSectionType.Strtab => new ElfStrtab(section, name), 10 | ElfSectionType.Symtab => new ElfSymtab(section, name), 11 | _ => new ElfSection(section, name), 12 | }; 13 | } 14 | } -------------------------------------------------------------------------------- /GCDTool/Elf/Sections/ElfStrtab.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Elf.Sections; 2 | 3 | sealed class ElfStrtab : ElfSection 4 | { 5 | public ElfStrtab(SectionHeaderTableEntry section, string name) 6 | : base(section, name) { } 7 | 8 | public string GetString(uint offset) 9 | { 10 | string result = string.Empty; 11 | while (offset < SectionHeader.SectionData.Length) 12 | { 13 | char c = (char)SectionHeader.SectionData[offset++]; 14 | if (c == '\0') 15 | { 16 | return result; 17 | } 18 | result += c; 19 | } 20 | return result; 21 | } 22 | } 23 | -------------------------------------------------------------------------------- /GCDTool/Elf/Sections/ElfSymbol.cs: -------------------------------------------------------------------------------- 1 | using GCDTool.IO; 2 | 3 | namespace GCDTool.Elf.Sections; 4 | 5 | sealed class ElfSymbol 6 | { 7 | public ElfSymbol(EndianBinaryReader er) 8 | { 9 | NameOffset = er.Read(); 10 | Value = er.Read(); 11 | Size = er.Read(); 12 | Info = er.Read(); 13 | Other = er.Read(); 14 | SectionIndex = er.Read(); 15 | } 16 | 17 | public uint NameOffset; 18 | public uint Value; 19 | public uint Size; 20 | public byte Info; 21 | public byte Other; 22 | public ushort SectionIndex; 23 | } -------------------------------------------------------------------------------- /GCDTool/Elf/Sections/ElfSymtab.cs: -------------------------------------------------------------------------------- 1 | using GCDTool.IO; 2 | 3 | namespace GCDTool.Elf.Sections; 4 | 5 | sealed class ElfSymtab : ElfSection 6 | { 7 | public IReadOnlyList Symbols { get; } 8 | 9 | public ElfSymtab(SectionHeaderTableEntry section, string name) 10 | : base(section, name) 11 | { 12 | uint nrEntries = section.FileImageSize / section.EntrySize; 13 | var symbols = new ElfSymbol[nrEntries]; 14 | var er = new EndianBinaryReader(new MemoryStream(section.SectionData), Endianness.LittleEndian); 15 | for (int i = 0; i < nrEntries; i++) 16 | { 17 | symbols[i] = new ElfSymbol(er); 18 | } 19 | Symbols = symbols; 20 | er.Close(); 21 | } 22 | } 23 | -------------------------------------------------------------------------------- /GCDTool/GCDTool.csproj: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | Exe 5 | net8.0 6 | enable 7 | enable 8 | Gericom 9 | True 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | -------------------------------------------------------------------------------- /GCDTool/GcdBlowfish.cs: -------------------------------------------------------------------------------- 1 | using GCDTool.IO; 2 | using System.Buffers.Binary; 3 | 4 | namespace GCDTool; 5 | 6 | /// 7 | /// Static helper class for the GCD blowfish table. 8 | /// 9 | static class GcdBlowfish 10 | { 11 | /// 12 | /// Creates the GCD blowfish table corresponding to the given . 13 | /// 14 | /// The game code. 15 | /// The transformed blowfish table. 16 | public static byte[] GetTransformedKeyTable(uint gameCode) 17 | { 18 | var keyTable = KeyTable.ToArray(); 19 | uint keyCode = BinaryPrimitives.ReverseEndianness(gameCode); 20 | for (int i = 0; i < Blowfish.P_TABLE_ENTRY_COUNT; i++) 21 | { 22 | IOUtil.WriteU32Le(keyTable, i * 4, 23 | IOUtil.ReadU32Le(keyTable, i * 4) ^ keyCode); 24 | } 25 | 26 | var scratch = new byte[8]; 27 | for (int i = 0; i < Blowfish.KEY_TABLE_LENGTH; i += Blowfish.BLOCK_LENGTH) 28 | { 29 | var blowfish = new Blowfish(keyTable); 30 | blowfish.Encrypt(scratch); 31 | Array.Copy(scratch, 4, keyTable, i, 4); 32 | Array.Copy(scratch, 0, keyTable, i + 4, 4); 33 | } 34 | 35 | return keyTable; 36 | } 37 | 38 | /// 39 | /// The untransformed GCD blowfish table. 40 | /// 41 | public static ReadOnlySpan KeyTable => 42 | [ 43 | 0xEE, 0xA8, 0x95, 0x75, 0x2D, 0xF3, 0xFF, 0x84, 0xC6, 0xAE, 0xF8, 0x58, 44 | 0xC2, 0x44, 0x64, 0x6F, 0xBC, 0xCF, 0xA6, 0x10, 0x13, 0xB8, 0xE1, 0xBE, 45 | 0xC3, 0xAB, 0xEF, 0x88, 0xCD, 0x26, 0x20, 0xC7, 0x3A, 0x91, 0x0B, 0xC0, 46 | 0xC0, 0x74, 0xB0, 0x9F, 0x0F, 0x83, 0xD4, 0x56, 0xE5, 0xDE, 0xAB, 0x69, 47 | 0xF2, 0x5F, 0x6E, 0xCF, 0x2F, 0xBE, 0xFE, 0xD7, 0xE2, 0xD5, 0xF5, 0x84, 48 | 0xDA, 0xCC, 0xA1, 0x73, 0x99, 0x59, 0x20, 0x44, 0x63, 0x8F, 0x27, 0x74, 49 | 0x53, 0x72, 0x90, 0xF0, 0x8F, 0xD4, 0x95, 0x1C, 0x99, 0xCE, 0xDB, 0x7C, 50 | 0x8A, 0x50, 0xB9, 0xA8, 0x9E, 0x9F, 0x37, 0x79, 0xFE, 0x44, 0x91, 0x12, 51 | 0x4D, 0x55, 0xB3, 0xD2, 0xC6, 0x02, 0xD7, 0x72, 0x43, 0x81, 0x05, 0xCE, 52 | 0xB8, 0x11, 0xB4, 0x72, 0xE7, 0x2A, 0xCF, 0x9A, 0x95, 0xD1, 0xC0, 0x62, 53 | 0xE5, 0x61, 0x08, 0x7D, 0xF6, 0xC8, 0x3A, 0x33, 0x59, 0x7B, 0xC1, 0xAF, 54 | 0x12, 0xAB, 0xAB, 0x7F, 0xDF, 0xB8, 0x20, 0x5A, 0xE1, 0x08, 0xC9, 0x43, 55 | 0x54, 0x7B, 0x05, 0xDF, 0x17, 0x7D, 0x23, 0x65, 0x1C, 0x58, 0x88, 0x89, 56 | 0xD9, 0xCA, 0x02, 0x1D, 0x8A, 0x3C, 0xE6, 0xDD, 0x12, 0xEE, 0x2F, 0x30, 57 | 0x9D, 0xDD, 0xBE, 0x0A, 0x74, 0xB5, 0x6F, 0x58, 0xAD, 0x0A, 0x13, 0x10, 58 | 0x35, 0xAD, 0x1E, 0x0A, 0x70, 0x08, 0x6F, 0xFE, 0x02, 0x4F, 0xAC, 0x8C, 59 | 0x2C, 0xEF, 0x56, 0x9C, 0xCD, 0x9B, 0xAB, 0xC0, 0x52, 0x9A, 0xAF, 0x7F, 60 | 0xCD, 0x2D, 0x82, 0xEF, 0xC2, 0xFD, 0xC0, 0x2B, 0x57, 0xA5, 0x22, 0xDE, 61 | 0x67, 0x28, 0xF8, 0xCC, 0x19, 0x9D, 0x2A, 0x58, 0x15, 0x07, 0x79, 0xD2, 62 | 0x89, 0xF6, 0x8D, 0xDC, 0xE2, 0xA6, 0x0C, 0x25, 0x6D, 0x23, 0x35, 0xFE, 63 | 0xD6, 0xE2, 0x48, 0x86, 0xE7, 0xF6, 0x0B, 0xAA, 0x20, 0x06, 0x24, 0xD1, 64 | 0xA7, 0x5E, 0x3A, 0x41, 0x43, 0x91, 0xF5, 0x4C, 0x72, 0x54, 0x4F, 0x4F, 65 | 0x08, 0x9A, 0xF2, 0xA5, 0x8F, 0x4E, 0xFF, 0x1F, 0x2D, 0xEC, 0xF0, 0x14, 66 | 0x2A, 0xF4, 0xD6, 0x47, 0xF0, 0x21, 0xB0, 0x85, 0x0A, 0xF2, 0x36, 0x78, 67 | 0xD7, 0xD0, 0x08, 0xD9, 0xD5, 0x9D, 0xCC, 0xBD, 0xFB, 0x0B, 0xAC, 0xA6, 68 | 0xAF, 0x7D, 0xFB, 0x96, 0xFF, 0x76, 0x54, 0xB6, 0x51, 0x9B, 0xE9, 0xBD, 69 | 0x8E, 0x4B, 0xC8, 0xE8, 0x30, 0x86, 0xC8, 0x72, 0x79, 0x09, 0x8D, 0x3F, 70 | 0xDC, 0x45, 0x1E, 0x5C, 0xDB, 0xB1, 0x55, 0x75, 0x90, 0x5A, 0xDB, 0x3E, 71 | 0x66, 0xAC, 0x7F, 0xB0, 0xBA, 0x6A, 0x31, 0xF7, 0xBD, 0x88, 0xA0, 0x84, 72 | 0x9D, 0xFB, 0xB2, 0xF0, 0xE1, 0x48, 0x4B, 0x01, 0xE3, 0x67, 0x09, 0x6D, 73 | 0xE4, 0x60, 0x8D, 0xA3, 0xF2, 0xED, 0x8E, 0x14, 0x64, 0x88, 0x89, 0x81, 74 | 0xAA, 0x73, 0x0D, 0xFE, 0xD5, 0x7B, 0xC3, 0x58, 0x45, 0xC3, 0xE2, 0x8C, 75 | 0xE7, 0x1D, 0x95, 0x82, 0xA6, 0x1A, 0xBE, 0x17, 0x1B, 0xAD, 0xE8, 0xBF, 76 | 0x76, 0x41, 0x6B, 0x4D, 0x3D, 0xA4, 0x0D, 0x3A, 0xAC, 0xDC, 0xA4, 0x50, 77 | 0x2E, 0x28, 0xF1, 0x69, 0x76, 0x95, 0xB4, 0x16, 0xFE, 0x1F, 0x52, 0x6B, 78 | 0x74, 0x81, 0x58, 0x67, 0x28, 0x1D, 0xDE, 0xB3, 0xBD, 0x8C, 0x19, 0x06, 79 | 0xEA, 0x40, 0xA2, 0xEE, 0x8E, 0x35, 0x3E, 0xD1, 0x6C, 0xB0, 0x64, 0x36, 80 | 0x27, 0xE2, 0xF4, 0x59, 0xD3, 0x22, 0x41, 0xB5, 0xE3, 0x71, 0xBB, 0x94, 81 | 0x94, 0xFB, 0x15, 0x03, 0xD6, 0x01, 0x73, 0x64, 0x0D, 0x1F, 0x3F, 0x94, 82 | 0xC4, 0xAE, 0x2A, 0x7A, 0xF7, 0x88, 0xBF, 0x51, 0x1A, 0x09, 0x2C, 0x71, 83 | 0x3E, 0x6E, 0x3B, 0x6D, 0x52, 0x4D, 0xB2, 0x6E, 0xA4, 0x2C, 0xC8, 0x9F, 84 | 0x8E, 0x18, 0xFC, 0x8F, 0x0A, 0x14, 0x31, 0xBE, 0x56, 0x57, 0x3E, 0x1D, 85 | 0x6E, 0xE1, 0x74, 0xC5, 0x93, 0xA7, 0x05, 0xB1, 0xEC, 0x58, 0xF6, 0x94, 86 | 0x4C, 0x86, 0xD4, 0x6E, 0xCF, 0xE3, 0xBA, 0xB2, 0x15, 0xCF, 0x42, 0xE3, 87 | 0x27, 0x4D, 0xBC, 0xF2, 0xB1, 0x34, 0x03, 0x09, 0x42, 0x2A, 0x63, 0xC2, 88 | 0x92, 0x00, 0x4F, 0x88, 0x51, 0xBD, 0x9A, 0xA5, 0xF9, 0x03, 0xD2, 0xE9, 89 | 0x57, 0x22, 0x12, 0x7D, 0xAA, 0x09, 0xA7, 0x02, 0x9B, 0xC3, 0x9F, 0xAC, 90 | 0xED, 0xBE, 0x40, 0x48, 0xA4, 0x37, 0xBE, 0x74, 0xD3, 0xA4, 0xB9, 0x24, 91 | 0xA7, 0xBC, 0x78, 0x81, 0xE5, 0x85, 0x6B, 0x60, 0xB2, 0x46, 0xCB, 0x1D, 92 | 0x60, 0x20, 0x11, 0xE6, 0x8A, 0x00, 0x44, 0xBD, 0x64, 0x29, 0xBE, 0xD1, 93 | 0x32, 0x50, 0xCC, 0xCF, 0x43, 0x0E, 0xE1, 0x74, 0xAB, 0xC5, 0xFA, 0x53, 94 | 0xA4, 0xE0, 0xA6, 0x84, 0x7A, 0x99, 0x80, 0x90, 0x00, 0x01, 0x1A, 0xA3, 95 | 0x1C, 0x1C, 0xE2, 0xCE, 0x73, 0xE9, 0xCE, 0xEB, 0xC7, 0xA4, 0xE9, 0x77, 96 | 0x9B, 0x1B, 0x26, 0x3A, 0x16, 0xCA, 0x49, 0xCE, 0x2D, 0x43, 0x3A, 0xEC, 97 | 0xBF, 0xC1, 0x10, 0x14, 0x24, 0xC8, 0x22, 0x8D, 0x66, 0x82, 0x01, 0xB0, 98 | 0xE2, 0xE2, 0x64, 0x79, 0x14, 0xEB, 0xC6, 0xFC, 0x35, 0xE0, 0xE6, 0x12, 99 | 0x0A, 0x9D, 0x68, 0xCA, 0xFC, 0x39, 0x9F, 0x5F, 0xE9, 0xF7, 0x14, 0xBF, 100 | 0xF2, 0x13, 0x78, 0x5D, 0x01, 0x74, 0x34, 0x87, 0x60, 0x76, 0x10, 0x1A, 101 | 0xB7, 0x1B, 0xAA, 0xFE, 0xA2, 0xB1, 0xEB, 0x53, 0x57, 0xA4, 0x47, 0xFC, 102 | 0x17, 0xDE, 0x1C, 0xF7, 0x36, 0x9A, 0x37, 0x25, 0x5D, 0x20, 0xED, 0xB2, 103 | 0x36, 0xBF, 0x25, 0x12, 0xD4, 0x6B, 0x53, 0x14, 0xDF, 0x8C, 0x13, 0x31, 104 | 0xF4, 0xB7, 0xEC, 0xEE, 0x19, 0x5B, 0x6E, 0xBB, 0x0F, 0x7D, 0x87, 0x39, 105 | 0x24, 0xAC, 0x66, 0x43, 0x3C, 0x89, 0x13, 0xFB, 0xB2, 0x39, 0x70, 0x3A, 106 | 0x37, 0x80, 0x1B, 0x3A, 0x34, 0x86, 0x66, 0xFC, 0x83, 0xB7, 0x3F, 0x0A, 107 | 0x26, 0x05, 0x38, 0x50, 0x1A, 0x4B, 0x0E, 0x9C, 0x98, 0x93, 0x2B, 0x46, 108 | 0x2D, 0x7D, 0x6C, 0x0E, 0x9E, 0x92, 0x9A, 0x68, 0xE6, 0x01, 0x57, 0x71, 109 | 0x7D, 0xD1, 0x61, 0x2E, 0x45, 0x91, 0xDA, 0x09, 0xA1, 0x3B, 0x14, 0xFB, 110 | 0x59, 0x92, 0x19, 0x5B, 0xEE, 0xA5, 0xE3, 0xC4, 0x9A, 0xDA, 0x4B, 0x0B, 111 | 0x6C, 0x52, 0x8C, 0xE1, 0x1A, 0x1C, 0x17, 0x73, 0x4B, 0xA9, 0x72, 0x15, 112 | 0x29, 0xB7, 0x15, 0x6D, 0x91, 0x9E, 0x50, 0x71, 0x6E, 0xC7, 0x1B, 0x57, 113 | 0x18, 0x10, 0x72, 0x8C, 0x42, 0x17, 0xCC, 0x1F, 0x75, 0x2C, 0x60, 0xA6, 114 | 0xA9, 0x88, 0x7F, 0x78, 0xC4, 0xF9, 0x98, 0x05, 0x1B, 0xC6, 0xDD, 0x5A, 115 | 0x41, 0x7B, 0x9B, 0x8E, 0x72, 0xAF, 0x4D, 0x2F, 0x2A, 0x9E, 0xF0, 0xD9, 116 | 0xCA, 0x54, 0x60, 0xE7, 0x4E, 0x0B, 0xBC, 0x28, 0x32, 0x0C, 0x32, 0x4A, 117 | 0x7E, 0x68, 0x2B, 0xDF, 0xCC, 0xFB, 0xDF, 0x2C, 0x69, 0x6B, 0xF1, 0x77, 118 | 0x65, 0x56, 0x42, 0x5D, 0xD9, 0x7F, 0x20, 0xCF, 0x6D, 0x16, 0x4D, 0x2E, 119 | 0x57, 0x79, 0xE5, 0x46, 0x39, 0x0F, 0xF5, 0x37, 0x4A, 0xB7, 0x42, 0x67, 120 | 0x47, 0xDF, 0x21, 0xBB, 0x64, 0x09, 0xDF, 0xE2, 0x89, 0xD9, 0xD6, 0x0D, 121 | 0x6E, 0x5A, 0x63, 0x6F, 0x57, 0xA4, 0x05, 0x8F, 0x10, 0xC0, 0x5D, 0x6E, 122 | 0x43, 0x6F, 0xE7, 0xEA, 0x6A, 0x20, 0x5C, 0x13, 0x38, 0xD9, 0x6B, 0x87, 123 | 0x07, 0xC6, 0xCB, 0x1C, 0x28, 0x0E, 0x60, 0xAF, 0xE0, 0x4F, 0xAA, 0x0D, 124 | 0x33, 0xFE, 0xE0, 0x95, 0xB1, 0x44, 0x3E, 0x09, 0xAD, 0xB2, 0x16, 0x1D, 125 | 0xA2, 0x0B, 0x71, 0x8D, 0xD9, 0xC1, 0xA3, 0x3C, 0xE1, 0xA8, 0x54, 0x8F, 126 | 0xC8, 0x1E, 0xB1, 0x7E, 0x0E, 0x2A, 0xB8, 0xCD, 0x6D, 0xFF, 0x1A, 0xDE, 127 | 0xE2, 0x2C, 0xAE, 0x68, 0x3E, 0xCA, 0xE1, 0x80, 0x2C, 0x0C, 0xD6, 0x67, 128 | 0xDA, 0xD1, 0x6A, 0xAC, 0x02, 0xC8, 0x30, 0x53, 0x4D, 0xA0, 0x67, 0x5F, 129 | 0x9D, 0x3C, 0x6F, 0x5D, 0xB0, 0x25, 0x47, 0x1F, 0x69, 0x4C, 0x4A, 0x09, 130 | 0x21, 0xEA, 0x1D, 0x4C, 0xD5, 0xCE, 0x09, 0xFD, 0x41, 0xC3, 0x0F, 0x27, 131 | 0xF5, 0x81, 0x60, 0xF1, 0xB4, 0xBD, 0xDC, 0x54, 0xF5, 0x6B, 0xA3, 0x72, 132 | 0x6A, 0xC1, 0xAB, 0xBE, 0x02, 0xBB, 0x82, 0xDD, 0x20, 0x5D, 0xE7, 0xF0, 133 | 0xB0, 0x64, 0x6A, 0xEA, 0x2C, 0x5C, 0xCB, 0x85, 0xAA, 0x5A, 0x3A, 0xD5, 134 | 0xD1, 0x91, 0x0F, 0x40, 0x5E, 0x69, 0x20, 0xC0, 0x76, 0x5C, 0xD0, 0xA3, 135 | 0x46, 0x04, 0xC0, 0x8A, 0xCE, 0xE1, 0xEB, 0xE0, 0x13, 0xCA, 0xD2, 0x7E, 136 | 0xCA, 0xBB, 0x41, 0x7F, 0xC0, 0xFF, 0xDA, 0x09, 0x09, 0x9C, 0xD3, 0x16, 137 | 0x9E, 0xFE, 0x17, 0xD4, 0x36, 0x4B, 0xFC, 0x11, 0x11, 0x21, 0xB9, 0x87, 138 | 0x89, 0xEA, 0x1C, 0x58, 0x6D, 0x51, 0x51, 0x6A, 0x94, 0xF9, 0x91, 0xA6, 139 | 0xAB, 0xC6, 0xE5, 0x06, 0x80, 0x07, 0x20, 0x81, 0xB7, 0x60, 0xEA, 0xE6, 140 | 0xAF, 0x67, 0x09, 0x8D, 0x79, 0x1D, 0xF8, 0x32, 0x78, 0x3B, 0xF6, 0x1B, 141 | 0xBB, 0x70, 0xFE, 0xEE, 0x42, 0x3B, 0x12, 0x74, 0x16, 0x5B, 0x34, 0xF7, 142 | 0x88, 0x13, 0xAA, 0x7A, 0x94, 0xA3, 0x52, 0x01, 0xA1, 0x3E, 0x46, 0xB5, 143 | 0x33, 0x86, 0x96, 0xE7, 0x17, 0x0F, 0xB0, 0xF6, 0x26, 0x59, 0xE6, 0xFE, 144 | 0x88, 0x5F, 0xC9, 0xFA, 0x38, 0x88, 0x78, 0xF7, 0xC8, 0x27, 0x4D, 0x40, 145 | 0x5A, 0x72, 0x40, 0x0A, 0x18, 0x86, 0x94, 0xAC, 0x6F, 0x96, 0xFB, 0xB2, 146 | 0xC3, 0x40, 0x0B, 0x73, 0xA0, 0xB3, 0xA5, 0x3F, 0x57, 0x7B, 0x4A, 0x2A, 147 | 0x94, 0x09, 0xEE, 0xE2, 0x03, 0x2B, 0x66, 0xE2, 0x53, 0xC2, 0x17, 0xA5, 148 | 0xC2, 0x9A, 0xCD, 0x5F, 0x1A, 0x86, 0xF1, 0x7C, 0x92, 0x6D, 0x9C, 0xFB, 149 | 0xF6, 0xFC, 0x6C, 0x72, 0x55, 0x08, 0xC2, 0x6B, 0x57, 0x77, 0x3C, 0xE0, 150 | 0xFC, 0xAE, 0xF7, 0x15, 0xB2, 0xF4, 0x90, 0x04, 0x9E, 0x9D, 0xC4, 0xC5, 151 | 0x03, 0xC4, 0x1B, 0xD9, 0x16, 0x90, 0x79, 0x84, 0x2F, 0x5D, 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0xDB, 0xE8, 0x53, 0x3D, 0x25, 280 | 0xC4, 0x5C, 0x00, 0x64, 0x6F, 0xE5, 0x3D, 0x81, 0xDA, 0x3C, 0x1C, 0x63, 281 | 0xBD, 0x81, 0x16, 0x93, 0xB8, 0x0A, 0xDD, 0x77, 0x6F, 0xB5, 0xD6, 0x15, 282 | 0xB1, 0x06, 0x31, 0x2A, 0xBF, 0x02, 0x31, 0x60, 0x3D, 0x9A, 0xF2, 0xFE, 283 | 0x38, 0xAA, 0x8B, 0x64, 0x91, 0xE7, 0x0A, 0x47, 0xAB, 0x25, 0xE6, 0x02, 284 | 0x5D, 0x4D, 0x90, 0x04, 0xA4, 0xCE, 0x31, 0x3B, 0x6D, 0x12, 0xA2, 0xA9, 285 | 0x75, 0x45, 0x81, 0x76, 0x11, 0x55, 0x6A, 0x4C, 0x19, 0xC6, 0xD7, 0xE2, 286 | 0xA5, 0x8C, 0x0D, 0x84, 0xF8, 0xE8, 0x15, 0x4D, 0x95, 0x6A, 0x25, 0x59, 287 | 0x56, 0x6A, 0xED, 0xF1, 0xAB, 0xEF, 0x96, 0xB9, 0x13, 0xC9, 0xA9, 0x5D, 288 | 0xD8, 0xBE, 0x52, 0x76, 0xBE, 0xA0, 0xBD, 0xED, 0x08, 0x19, 0xF8, 0x59, 289 | 0xD7, 0x5E, 0xD4, 0xD1, 0x76, 0xF8, 0xB5, 0x00, 0xE4, 0x97, 0x6B, 0x98, 290 | 0x62, 0x98, 0xF9, 0x0B, 0xC6, 0x48, 0xA4, 0xF3, 0x73, 0x25, 0xF9, 0x05, 291 | 0xC4, 0xC7, 0xB2, 0x9A, 0xF2, 0xBB, 0x92, 0xBF, 0x36, 0xE0, 0xE5, 0xA8, 292 | 0x2B, 0xA0, 0x30, 0x30, 0x3B, 0x83, 0x1E, 0xAB, 0x39, 0xD0, 0x90, 0x51, 293 | 0xC2, 0xEE, 0x31, 0x3D, 0x27, 0xF4, 0xAD, 0x4E, 0x17, 0xD2, 0x65, 0xEA, 294 | 0xD3, 0x4D, 0xAC, 0xAF, 0xFE, 0xF6, 0x5E, 0xDF, 0x6C, 0xDD, 0x8C, 0xE8, 295 | 0xDF, 0xD1, 0x55, 0xAB, 0x8B, 0x9E, 0x68, 0x77, 0x81, 0xB0, 0xA6, 0x3B, 296 | 0x08, 0x79, 0xD3, 0x9E, 0x78, 0x36, 0x38, 0x42, 0xA6, 0x21, 0xF2, 0xF9, 297 | 0x5D, 0x35, 0xCF, 0xB6, 0x09, 0xAA, 0x10, 0x1C, 0x86, 0x54, 0x64, 0x38, 298 | 0x0E, 0x32, 0x46, 0xAB, 0xCE, 0xBD, 0x01, 0x6C, 0xBF, 0x77, 0x9B, 0xAA, 299 | 0x85, 0x70, 0x8A, 0xDC, 0xC0, 0x40, 0x3C, 0x84, 0x12, 0x8B, 0x21, 0x35, 300 | 0x35, 0x5A, 0xC1, 0x57, 0xD4, 0x79, 0xA8, 0x37, 0x71, 0x86, 0xFA, 0x41, 301 | 0xF3, 0xE4, 0xBA, 0xE9, 0x23, 0xC9, 0x21, 0x95, 0xB3, 0xBA, 0x32, 0x2A, 302 | 0x6B, 0xB4, 0x15, 0x54, 0xDD, 0x45, 0x72, 0xCB, 0xBD, 0x07, 0x64, 0x6E, 303 | 0x82, 0x77, 0x47, 0x88, 0xA6, 0x4E, 0x42, 0x18, 0x27, 0x44, 0x21, 0x48, 304 | 0xB8, 0xB8, 0x66, 0xD2, 0xD4, 0x96, 0xB7, 0x70, 0x23, 0x82, 0xE4, 0xE4, 305 | 0x45, 0xBF, 0xA5, 0xF6, 0x00, 0xC4, 0x4C, 0xA3, 0x1C, 0xF2, 0x62, 0x0B, 306 | 0xA7, 0x6C, 0xEB, 0xF0, 0xA3, 0x66, 0x85, 0x4F, 0x04, 0x59, 0x3E, 0xD2, 307 | 0xFD, 0xC0, 0xEA, 0x86, 0x7D, 0x0A, 0x08, 0x95, 0x24, 0x6A, 0x92, 0xE2, 308 | 0xA1, 0xC4, 0x83, 0x99, 0x84, 0x8B, 0x39, 0x7E, 0xF1, 0xB2, 0xCC, 0x9F, 309 | 0x6B, 0x69, 0x70, 0xFF, 0xF7, 0x7A, 0xB4, 0xCC, 0x96, 0xBF, 0xD3, 0x61, 310 | 0x85, 0x03, 0x17, 0xF4, 0xEF, 0x6F, 0xC8, 0x0B, 0x90, 0x5C, 0xFB, 0x06, 311 | 0xFE, 0xD9, 0x92, 0xCE, 0xCF, 0xA3, 0x0C, 0x12, 0x59, 0x2F, 0xDE, 0xDC, 312 | 0x38, 0x2B, 0xFD, 0xD6, 0x74, 0xD9, 0x58, 0x42, 0x3C, 0x0A, 0x2C, 0x4B, 313 | 0xEC, 0x67, 0x09, 0x1F, 0x51, 0x7E, 0x98, 0x25, 0xC7, 0xCF, 0x7A, 0x4E, 314 | 0x94, 0x96, 0x7F, 0x1F, 0x30, 0x32, 0xDE, 0x18, 0x5D, 0x09, 0xD9, 0x85, 315 | 0x16, 0x76, 0x73, 0x54, 0x56, 0x69, 0xC2, 0x6E, 0x7B, 0x63, 0xB3, 0x9E, 316 | 0x92, 0x51, 0x8A, 0x90, 0x3E, 0xB4, 0x9F, 0x83, 0x2A, 0x0F, 0xE7, 0xEF, 317 | 0xA5, 0x68, 0xE1, 0x42, 0x22, 0x5C, 0x6E, 0x77, 0xA9, 0xE3, 0x6B, 0x73, 318 | 0xED, 0x66, 0x2D, 0xB7, 0x94, 0x47, 0xF9, 0xA4, 0x55, 0xBD, 0x14, 0xB4, 319 | 0xD3, 0x23, 0xE6, 0x5D, 0xA9, 0xE1, 0xD1, 0x9C, 0x7E, 0x7F, 0x95, 0x42, 320 | 0x93, 0xF5, 0x1C, 0x38, 0x07, 0x7D, 0x8A, 0x67, 0x04, 0xB6, 0x8B, 0x15, 321 | 0xBD, 0x26, 0x49, 0xE6, 0x38, 0x74, 0x04, 0x5A, 0xCB, 0x68, 0x0D, 0x36, 322 | 0x8E, 0x7A, 0x48, 0xAB, 0x0B, 0x9A, 0x76, 0x0D, 0x39, 0xC9, 0x3F, 0xDE, 323 | 0xC0, 0xA9, 0x3E, 0xF3, 0x55, 0x74, 0xB8, 0x28, 0x0C, 0xC0, 0xF6, 0xD5, 324 | 0xFE, 0x8F, 0x3F, 0x85, 0xC3, 0x38, 0xD2, 0xC8, 0x3E, 0x47, 0xB5, 0x3B, 325 | 0x97, 0x90, 0x77, 0xC9, 0x0C, 0x3A, 0xAF, 0xC4, 0xC0, 0x98, 0x90, 0x89, 326 | 0xE4, 0xC0, 0x51, 0x3C, 0x4E, 0x21, 0x02, 0x7E, 0xA4, 0x85, 0x5F, 0xE6, 327 | 0x57, 0xA8, 0xC4, 0xE7, 0x9E, 0x17, 0x96, 0x60, 0x59, 0xB5, 0x9E, 0x9C, 328 | 0x7D, 0x5F, 0x9A, 0x70, 0xD5, 0x6F, 0x8F, 0x54, 0xCB, 0x58, 0xAD, 0xF1, 329 | 0x83, 0xE7, 0xBC, 0xE4, 0x6C, 0x2B, 0xCA, 0x43, 0x8F, 0xDE, 0x43, 0x6F, 330 | 0xF9, 0x02, 0x0A, 0xA6, 0x35, 0x0F, 0xDD, 0xBC, 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0xF9, 0xF6, 0xD0, 0x49, 0xD2, 0xF5, 0x60, 344 | 0x81, 0x6B, 0xB6, 0x10, 0x37, 0x64, 0xB2, 0xEE, 0x2C, 0x33, 0x39, 0xE7, 345 | 0xFD, 0xBD, 0x94, 0xEB, 0xE3, 0xE0, 0xC4, 0xBF, 0xA8, 0xE7, 0x8E, 0x5D, 346 | 0xC3, 0xC5, 0x76, 0xF6, 0x61, 0x70, 0x35, 0x38, 0x68, 0x4D, 0x3E, 0x8D, 347 | 0x0B, 0x28, 0x60, 0xD5, 0x38, 0xB4, 0x85, 0x7A, 0x19, 0xDA, 0xE7, 0x00, 348 | 0x1B, 0x02, 0xE3, 0x44, 0x73, 0xEE, 0x2B, 0xB2, 0x14, 0x11, 0xF1, 0x7A, 349 | 0xD3, 0xAC, 0x4A, 0x9A, 0x7A, 0xA9, 0x5E, 0xBB, 0x0B, 0xAC, 0x93, 0x79, 350 | 0xD7, 0x2E, 0xC1, 0x3D, 0xA8, 0xED, 0xC7, 0x7A, 0x57, 0x8E, 0x52, 0x26, 351 | 0xC9, 0x78, 0x5B, 0xB1, 0x77, 0xB1, 0xE2, 0xEA, 0x3C, 0x7A, 0xBD, 0xA9, 352 | 0x80, 0x21, 0x81, 0x03, 0x1F, 0x45, 0xD1, 0x0E, 0x7D, 0xC5, 0xB1, 0x9A, 353 | 0xC5, 0xC3, 0xAC, 0xA0, 0x3D, 0x53, 0x0B, 0xBF, 0x13, 0x84, 0x7F, 0x01, 354 | 0x2A, 0x45, 0x28, 0x32, 0xE1, 0x48, 0xEB, 0x86, 0xFF, 0xBC, 0x9C, 0x37, 355 | 0x75, 0x0F, 0x20, 0x3B, 0x2B, 0xB6, 0xBB, 0x0C, 0x7F, 0x62, 0x67, 0x74, 356 | 0xE3, 0xB5, 0x82, 0xC7, 0x37, 0xC5, 0x02, 0xD4, 0x42, 0xE8, 0x6B, 0x02, 357 | 0x7A, 0x2D, 0xA3, 0x41, 0xFF, 0xB6, 0x10, 0x59, 0xB4, 0x26, 0x99, 0x90, 358 | 0x1E, 0x81, 0xBD, 0x05, 0xC8, 0x98, 0xFD, 0x92, 0x80, 0xE9, 0x66, 0xCF, 359 | 0x9C, 0xB7, 0x5E, 0x1F, 0xE4, 0x31, 0x2C, 0x4E, 0x0C, 0x7F, 0x9B, 0x5F, 360 | 0x91, 0x2E, 0x97, 0x91, 0x5A, 0x2E, 0x0F, 0xF7, 0x27, 0xB6, 0xB6, 0xD5, 361 | 0x3A, 0x24, 0x1F, 0x3B, 0x7B, 0xCB, 0x04, 0xF4, 0xC3, 0x2E, 0x23, 0xE6, 362 | 0x06, 0x89, 0xDA, 0x22, 0xFF, 0x48, 0xB3, 0x0C, 0x9D, 0x34, 0xA6, 0x0D, 363 | 0x98, 0x8B, 0x85, 0x7C, 0xF1, 0x58, 0xB2, 0xD9, 0xD4, 0x9D, 0x3C, 0x62, 364 | 0x26, 0xC6, 0x93, 0x84, 0x3B, 0x1F, 0x55, 0x91, 0x53, 0x7A, 0xD9, 0x6E, 365 | 0x32, 0x0C, 0xA1, 0xB5, 0x3E, 0x9F, 0xD3, 0x23, 0x04, 0xDA, 0xE7, 0x57, 366 | 0x89, 0x26, 0x0B, 0x8F, 0x29, 0x45, 0xB5, 0xEB, 0x72, 0x55, 0x01, 0x0F, 367 | 0x33, 0xB8, 0x4D, 0x2F, 0x2B, 0x1D, 0x7E, 0x40, 0x1A, 0x5F, 0x81, 0xFD, 368 | 0x64, 0xBB, 0xAC, 0xDE, 0x59, 0x88, 0xC3, 0xE8, 0x0B, 0x11, 0x04, 0xDE, 369 | 0xAB, 0x01, 0xC9, 0xB6, 0x1A, 0xEE, 0x3A, 0x15, 0x20, 0xF7, 0x5A, 0x6B, 370 | 0x96, 0xE7, 0xBF, 0xC3, 0xC7, 0x2B, 0x41, 0x8B, 0x67, 0xE1, 0xCB, 0xE8, 371 | 0xF2, 0x3D, 0xD8, 0x60, 0x81, 0x69, 0x50, 0x35, 0xC7, 0x1F, 0x8F, 0x2B, 372 | 0xCF, 0x29, 0x10, 0x31, 0x6E, 0xAD, 0x6F, 0xF4, 0x6B, 0x05, 0x40, 0x74, 373 | 0x79, 0x97, 0xDF, 0x61, 0xDA, 0x02, 0x3D, 0x69, 0xCC, 0x3C, 0xD9, 0xE7, 374 | 0xD3, 0xD3, 0x1B, 0x86, 0xA0, 0x85, 0x0B, 0xAD, 0x7A, 0x27, 0xCD, 0x8B, 375 | 0xB7, 0xCE, 0x2F, 0xB7, 0x4F, 0xD8, 0xA5, 0x8C, 0x50, 0x71, 0x84, 0xC0, 376 | 0x28, 0x84, 0xD8, 0x1B, 0x0D, 0xCA, 0x73, 0x46, 0xE5, 0xDB, 0x30, 0xB0, 377 | 0xC1, 0x06, 0x1C, 0xB5, 0xFB, 0xAF, 0x2B, 0x64, 0x3B, 0x04, 0xB5, 0xCC, 378 | 0xCB, 0xEB, 0x4A, 0xB8, 0x52, 0x03, 0xD8, 0xBC, 0xD6, 0x20, 0x55, 0x38, 379 | 0xAA, 0x18, 0x45, 0x3B, 0xBE, 0x1B, 0xD9, 0xFE, 0x32, 0x89, 0xF6, 0x95, 380 | 0x0E, 0xAE, 0x10, 0x3A, 0xAF, 0xAE, 0x33, 0xD7, 0xA7, 0x5B, 0xF8, 0xF9, 381 | 0xD1, 0xC3, 0x8A, 0x97, 0x0C, 0x54, 0x64, 0x6A, 0x5C, 0x57, 0xA1, 0xC5, 382 | 0x2B, 0xCD, 0xAD, 0xC2, 0x65, 0x54, 0xD4, 0xC3, 0x05, 0x1F, 0x67, 0x47, 383 | 0xF3, 0xFF, 0x42, 0x85, 0x92, 0x8F, 0x52, 0x0F, 0xCD, 0xB9, 0xA8, 0x3D, 384 | 0x28, 0x69, 0xE9, 0x13, 0x86, 0xCB, 0xE5, 0x0A, 0x23, 0x24, 0x60, 0x55, 385 | 0x22, 0xB0, 0xCF, 0x1A, 0x6B, 0xF1, 0xC9, 0x68, 0xA5, 0x28, 0xBC, 0xBE, 386 | 0x5E, 0xD1, 0xD1, 0xB1, 0x30, 0x41, 0xF5, 0xA9, 0x93, 0x0B, 0xBB, 0x0E, 387 | 0xB9, 0xFD, 0x3F, 0xAF, 0xAD, 0x8A, 0x07, 0x52, 0x60, 0x21, 0xBF, 0xB3, 388 | 0x05, 0x9D, 0x4D, 0xFB, 0xA3, 0x85, 0x27, 0xE3, 0xE5, 0x87, 0x5A, 0xD0, 389 | 0xA5, 0x68, 0x8E, 0x68, 0x76, 0x03, 0x84, 0x38, 0x8D, 0xAC, 0x46, 0x9B, 390 | 0xFD, 0x86, 0xF2, 0x23 391 | ]; 392 | } -------------------------------------------------------------------------------- /GCDTool/GcdHeader.cs: -------------------------------------------------------------------------------- 1 | using GCDTool.IO; 2 | using GCDTool.Wram; 3 | using System.Security.Cryptography; 4 | 5 | namespace GCDTool; 6 | 7 | /// 8 | /// Class representing the header of a GCD rom file. 9 | /// 10 | sealed class GcdHeader 11 | { 12 | /// 13 | /// The game code of the GCD rom. 14 | /// 15 | public uint GameCode { get; set; } 16 | 17 | /// 18 | /// The offset of the ARM 9 binary in the rom. 19 | /// 20 | public uint Arm9RomOffset { get; set; } 21 | 22 | /// 23 | /// The original size of the ARM 9 binary. 24 | /// 25 | public uint Arm9Size { get; set; } 26 | 27 | /// 28 | /// The memory address where the ARM 9 binary will be loaded. 29 | /// 30 | public uint Arm9LoadAddress { get; set; } 31 | 32 | /// 33 | /// The padded size of the ARM 9 binary. 34 | /// 35 | public uint Arm9PaddedSize { get; set; } 36 | 37 | /// 38 | /// The offset of the ARM 7 binary in the rom. 39 | /// 40 | public uint Arm7RomOffset { get; set; } 41 | 42 | /// 43 | /// The original size of the ARM 7 binary. 44 | /// 45 | public uint Arm7Size { get; set; } 46 | 47 | /// 48 | /// The memory address where the ARM 7 binary will be loaded. 49 | /// 50 | public uint Arm7LoadAddress { get; set; } 51 | 52 | /// 53 | /// The padded size of the ARM 7 binary. 54 | /// 55 | public uint Arm7PaddedSize { get; set; } 56 | 57 | /// 58 | /// The regular rom control settings. 59 | /// 60 | public uint RomControl { get; set; } 61 | 62 | /// 63 | /// The secure rom control settings. 64 | /// 65 | public uint RomControlSecure { get; set; } 66 | 67 | /// 68 | /// The secure area delay. 69 | /// 70 | public ushort SecureAreaDelay { get; set; } 71 | 72 | /// 73 | /// The end of the nitro region of the rom. 74 | /// 75 | public ushort NitroRomRegionEnd { get; set; } 76 | 77 | /// 78 | /// The start of the twl region of the rom. 79 | /// 80 | public ushort TwlRomRegionStart { get; set; } 81 | 82 | /// 83 | /// Flags controlling how the GCD firm is loaded. 84 | /// 85 | public GcdHeaderFlags Flags { get; set; } 86 | 87 | /// 88 | /// The RSA signed signature. See for the format before signing. 89 | /// 90 | public byte[] Signature { get; } = new byte[GcdSignature.SIGNATURE_SIGNED_LENGTH]; 91 | 92 | /// 93 | /// The initial WRAM configuration used by the GCD firm. 94 | /// 95 | public WramConfig WramConfiguration { get; set; } = new(); 96 | 97 | /// 98 | /// Serializes the header data as a byte array. 99 | /// 100 | /// The header data as a byte array. 101 | public byte[] ToByteArray() 102 | { 103 | var header = new byte[0x200]; 104 | IOUtil.WriteU32Le(header, 0x0C, GameCode); 105 | IOUtil.WriteU32Le(header, 0x20, Arm9RomOffset); 106 | IOUtil.WriteU32Le(header, 0x24, Arm9Size); 107 | IOUtil.WriteU32Le(header, 0x28, Arm9LoadAddress); 108 | IOUtil.WriteU32Le(header, 0x2C, Arm9PaddedSize); 109 | IOUtil.WriteU32Le(header, 0x30, Arm7RomOffset); 110 | IOUtil.WriteU32Le(header, 0x34, Arm7Size); 111 | IOUtil.WriteU32Le(header, 0x38, Arm7LoadAddress); 112 | IOUtil.WriteU32Le(header, 0x3C, Arm7PaddedSize); 113 | IOUtil.WriteU32Le(header, 0x60, RomControl); 114 | IOUtil.WriteU32Le(header, 0x64, RomControlSecure); 115 | IOUtil.WriteU16Le(header, 0x6E, SecureAreaDelay); 116 | IOUtil.WriteU16Le(header, 0x90, NitroRomRegionEnd); 117 | IOUtil.WriteU16Le(header, 0x92, TwlRomRegionStart); 118 | header[0xFF] = (byte)Flags; 119 | Signature.CopyTo(header, 0x100); 120 | WramConfiguration.Write(header.AsSpan(0x180)); 121 | return header; 122 | } 123 | 124 | /// 125 | /// Calculates the SHA-1 hash used for . 126 | /// 127 | /// The byte span to write the SHA-1 hash to. 128 | public void GetSha1Hash(Span destination) 129 | { 130 | var headerData = ToByteArray(); 131 | SHA1.HashData([.. headerData.AsSpan(0, 0x100), .. headerData.AsSpan(0x180, 0x80)], destination); 132 | } 133 | } 134 | -------------------------------------------------------------------------------- /GCDTool/GcdHeaderFlags.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool; 2 | 3 | [Flags] 4 | enum GcdHeaderFlags : byte 5 | { 6 | Arm9Compressed = (1 << 0), 7 | Arm7Compressed = (1 << 1), 8 | Arm9Speed134MHz = (1 << 2) 9 | } -------------------------------------------------------------------------------- /GCDTool/GcdRom.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool; 2 | 3 | /// 4 | /// Class representing a GCD rom file. 5 | /// 6 | sealed class GcdRom 7 | { 8 | private const int BLOWFISH_P_TABLE_OFFSET = 0x1600; 9 | private const int BLOWFISH_S_BOXES_OFFSET = 0x1C00; 10 | private const int TEST_PATTERNS_OFFSET = 0x3000; 11 | 12 | /// 13 | /// The header of the GCD rom. 14 | /// 15 | public GcdHeader Header { get; set; } = new(); 16 | 17 | /// 18 | /// The encrypted ARM 9 binary. 19 | /// 20 | public byte[] EncryptedArm9Binary { get; set; } = []; 21 | 22 | /// 23 | /// The encrypted ARM 7 binary. 24 | /// 25 | public byte[] EncryptedArm7Binary { get; set; } = []; 26 | 27 | /// 28 | /// Writes the GCD rom file to the given . 29 | /// 30 | /// The stream to write to. 31 | public void Write(Stream stream) 32 | { 33 | stream.Write(Header.ToByteArray()); 34 | WriteBlowfishTable(stream); 35 | WriteTestPatterns(stream); 36 | stream.Position = Header.Arm9RomOffset; 37 | stream.Write(EncryptedArm9Binary); 38 | stream.Position = Header.Arm7RomOffset; 39 | stream.Write(EncryptedArm7Binary); 40 | } 41 | 42 | private void WriteBlowfishTable(Stream stream) 43 | { 44 | var blowfishTable = GcdBlowfish.GetTransformedKeyTable(Header.GameCode); 45 | stream.Position = BLOWFISH_P_TABLE_OFFSET; 46 | stream.Write(blowfishTable, 0, Blowfish.P_TABLE_ENTRY_COUNT * 4); 47 | stream.Position = BLOWFISH_S_BOXES_OFFSET; 48 | stream.Write(blowfishTable, Blowfish.P_TABLE_ENTRY_COUNT * 4, Blowfish.S_BOX_COUNT * Blowfish.S_BOX_ENTRY_COUNT * 4); 49 | } 50 | 51 | private void WriteTestPatterns(Stream stream) 52 | { 53 | stream.Position = TEST_PATTERNS_OFFSET; 54 | stream.Write([0xFF, 0x00, 0xFF, 0x00, 0xAA, 0x55, 0xAA, 0x55]); 55 | for (int i = 8; i < 0x200; i++) 56 | { 57 | stream.WriteByte((byte)(i & 0xFF)); 58 | } 59 | for (int i = 0; i < 0x200; i++) 60 | { 61 | stream.WriteByte((byte)(0xFF - (i & 0xFF))); 62 | } 63 | for (int i = 0; i < 0x200; i++) 64 | { 65 | stream.WriteByte(0x00); 66 | } 67 | for (int i = 0; i < 0x200; i++) 68 | { 69 | stream.WriteByte(0xFF); 70 | } 71 | for (int i = 0; i < 0x200; i++) 72 | { 73 | stream.WriteByte(0x0F); 74 | } 75 | for (int i = 0; i < 0x200; i++) 76 | { 77 | stream.WriteByte(0xF0); 78 | } 79 | for (int i = 0; i < 0x200; i++) 80 | { 81 | stream.WriteByte(0x55); 82 | } 83 | for (int i = 0; i < 0x1FF; i++) 84 | { 85 | stream.WriteByte(0xAA); 86 | } 87 | } 88 | } 89 | -------------------------------------------------------------------------------- /GCDTool/GcdSignature.cs: -------------------------------------------------------------------------------- 1 | using Org.BouncyCastle.Crypto.Encodings; 2 | using Org.BouncyCastle.Crypto.Engines; 3 | using Org.BouncyCastle.Crypto; 4 | using Org.BouncyCastle.OpenSsl; 5 | using System.Security.Cryptography; 6 | 7 | namespace GCDTool; 8 | 9 | /// 10 | /// Class representing a GCD signature. 11 | /// 12 | sealed class GcdSignature 13 | { 14 | /// 15 | /// The length of the signature data before signing. 16 | /// 17 | public const int SIGNATURE_LENGTH = 0x74; 18 | 19 | /// 20 | /// The length of the signature data after signing. 21 | /// 22 | public const int SIGNATURE_SIGNED_LENGTH = 0x80; 23 | 24 | /// 25 | /// AES key Y used for encrypting the ARM 9 and ARM 7 binaries. 26 | /// 27 | public byte[] AesKeyY { get; } = new byte[16]; 28 | 29 | /// 30 | /// The SHA-1 hash of the 0x180 bytes consisting of header[0..0x100] and header[0x180..0x200]. 31 | /// 32 | public byte[] HeaderSha1 { get; } = new byte[20]; 33 | 34 | /// 35 | /// The SHA-1 hash of the original ARM 9 binary (without padding and AES encryption). 36 | /// 37 | public byte[] Arm9Sha1 { get; } = new byte[20]; 38 | 39 | /// 40 | /// The SHA-1 hash of the original ARM 7 binary (without padding and AES encryption). 41 | /// 42 | public byte[] Arm7Sha1 { get; } = new byte[20]; 43 | 44 | /// 45 | /// Serializes the signature as a byte array. 46 | /// 47 | /// The signature as byte array. 48 | public byte[] ToByteArray() 49 | { 50 | var signature = new byte[SIGNATURE_LENGTH]; 51 | AesKeyY.CopyTo(signature, 0x00); 52 | HeaderSha1.CopyTo(signature, 0x10); 53 | Arm9Sha1.CopyTo(signature, 0x24); 54 | Arm7Sha1.CopyTo(signature, 0x38); 55 | SHA1.HashData(signature.AsSpan(0, 0x60), signature.AsSpan(0x60)); 56 | return signature; 57 | } 58 | 59 | /// 60 | /// Serializes the signature as a byte array and signs the result 61 | /// using the RSA private key specified by . 62 | /// 63 | /// The path to the .der file containing the private RSA key to use. 64 | /// A byte array containing the signed signature. 65 | public byte[] ToSignedByteArray(string derKeyPath) 66 | { 67 | var rsaCryptoServiceProvider = new RSACryptoServiceProvider(); 68 | rsaCryptoServiceProvider.ImportRSAPrivateKey(File.ReadAllBytes(derKeyPath), out _); 69 | string pem = rsaCryptoServiceProvider.ExportRSAPrivateKeyPem(); 70 | 71 | var keyPair = (AsymmetricCipherKeyPair)new PemReader(new StringReader(pem)).ReadObject(); 72 | var rsa = new Pkcs1Encoding(new RsaEngine()); 73 | rsa.Init(true, keyPair.Private); 74 | return rsa.ProcessBlock(ToByteArray(), 0, SIGNATURE_LENGTH); 75 | } 76 | } 77 | -------------------------------------------------------------------------------- /GCDTool/IO/EndianBinaryReader.cs: -------------------------------------------------------------------------------- 1 | using System.Diagnostics.CodeAnalysis; 2 | using System.Runtime.InteropServices; 3 | using System.Text; 4 | 5 | namespace GCDTool.IO; 6 | 7 | sealed class EndianBinaryReader : IDisposable 8 | { 9 | private bool _disposed; 10 | private byte[]? _buffer; 11 | 12 | public Stream BaseStream { get; } 13 | public Endianness Endianness { get; } 14 | 15 | public static Endianness SystemEndianness => 16 | BitConverter.IsLittleEndian ? Endianness.LittleEndian : Endianness.BigEndian; 17 | 18 | private bool Reverse => SystemEndianness != Endianness; 19 | 20 | public EndianBinaryReader(Stream baseStream, Endianness endianness = Endianness.LittleEndian) 21 | { 22 | if (!baseStream.CanRead) 23 | { 24 | throw new ArgumentException("Stream is not readable.", nameof(baseStream)); 25 | } 26 | 27 | BaseStream = baseStream; 28 | Endianness = endianness; 29 | } 30 | 31 | ~EndianBinaryReader() 32 | { 33 | Dispose(false); 34 | } 35 | 36 | [MemberNotNull(nameof(_buffer))] 37 | private void FillBuffer(int bytes, int stride) 38 | { 39 | if (_buffer == null || _buffer.Length < bytes) 40 | { 41 | _buffer = new byte[bytes]; 42 | } 43 | 44 | BaseStream.Read(_buffer, 0, bytes); 45 | 46 | if (Reverse && stride > 1) 47 | { 48 | for (int i = 0; i < bytes; i += stride) 49 | { 50 | Array.Reverse(_buffer, i, stride); 51 | } 52 | } 53 | } 54 | 55 | public char ReadChar(Encoding encoding) 56 | { 57 | int size = GetEncodingSize(encoding); 58 | FillBuffer(size, size); 59 | return encoding.GetChars(_buffer, 0, size)[0]; 60 | } 61 | 62 | public char[] ReadChars(Encoding encoding, int count) 63 | { 64 | int size = GetEncodingSize(encoding); 65 | FillBuffer(size * count, size); 66 | return encoding.GetChars(_buffer, 0, size * count); 67 | } 68 | 69 | private static int GetEncodingSize(Encoding encoding) 70 | { 71 | if (encoding == Encoding.UTF8 || encoding == Encoding.ASCII) 72 | { 73 | return 1; 74 | } 75 | else if (encoding == Encoding.Unicode || encoding == Encoding.BigEndianUnicode) 76 | { 77 | return 2; 78 | } 79 | else 80 | { 81 | return 1; 82 | } 83 | } 84 | 85 | public string ReadStringNT(Encoding encoding) 86 | { 87 | string text = string.Empty; 88 | do 89 | { 90 | text += ReadChar(encoding); 91 | } while (!text.EndsWith("\0", StringComparison.Ordinal)); 92 | 93 | return text.Remove(text.Length - 1); 94 | } 95 | 96 | public string ReadString(Encoding encoding, int count) 97 | { 98 | return new string(ReadChars(encoding, count)); 99 | } 100 | 101 | public unsafe T Read() where T : unmanaged 102 | { 103 | int size = sizeof(T); 104 | FillBuffer(size, size); 105 | return MemoryMarshal.Read(_buffer); 106 | } 107 | 108 | public unsafe T[] Read(int count) where T : unmanaged 109 | { 110 | int size = sizeof(T); 111 | var result = new T[count]; 112 | var byteResult = MemoryMarshal.Cast(result); 113 | BaseStream.Read(byteResult); 114 | 115 | if (Reverse && size > 1) 116 | { 117 | for (int i = 0; i < size * count; i += size) 118 | { 119 | byteResult.Slice(i, size).Reverse(); 120 | } 121 | } 122 | 123 | return result; 124 | } 125 | 126 | public void Close() 127 | { 128 | Dispose(); 129 | } 130 | 131 | public void Dispose() 132 | { 133 | Dispose(true); 134 | GC.SuppressFinalize(this); 135 | } 136 | 137 | private void Dispose(bool disposing) 138 | { 139 | if (_disposed) 140 | { 141 | return; 142 | } 143 | 144 | if (disposing) 145 | { 146 | BaseStream?.Close(); 147 | } 148 | 149 | _buffer = null; 150 | _disposed = true; 151 | } 152 | } -------------------------------------------------------------------------------- /GCDTool/IO/Endianness.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.IO; 2 | 3 | enum Endianness 4 | { 5 | BigEndian, 6 | LittleEndian 7 | } -------------------------------------------------------------------------------- /GCDTool/IO/IOUtil.cs: -------------------------------------------------------------------------------- 1 | using System.Buffers.Binary; 2 | using System.Runtime.CompilerServices; 3 | using System.Runtime.InteropServices; 4 | 5 | namespace GCDTool.IO; 6 | 7 | static class IOUtil 8 | { 9 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 10 | public static short ReadS16Le(byte[] data, int offset) 11 | => BinaryPrimitives.ReadInt16LittleEndian(data.AsSpan(offset)); 12 | 13 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 14 | public static short ReadS16Le(ReadOnlySpan span) 15 | => BinaryPrimitives.ReadInt16LittleEndian(span); 16 | 17 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 18 | public static short[] ReadS16Le(byte[] data, int offset, int count) 19 | => ReadS16Le(data.AsSpan(offset), count); 20 | 21 | public static short[] ReadS16Le(ReadOnlySpan data, int count) 22 | { 23 | var res = MemoryMarshal.Cast(data.Slice(0, count * 2)).ToArray(); 24 | if (!BitConverter.IsLittleEndian) 25 | { 26 | for (int i = 0; i < count; i++) 27 | res[i] = BinaryPrimitives.ReverseEndianness(res[i]); 28 | } 29 | 30 | return res; 31 | } 32 | 33 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 34 | public static void WriteS16Le(byte[] data, int offset, short value) 35 | => BinaryPrimitives.WriteInt16LittleEndian(data.AsSpan(offset), value); 36 | 37 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 38 | public static void WriteS16Le(Span span, short value) 39 | => BinaryPrimitives.WriteInt16LittleEndian(span, value); 40 | 41 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 42 | public static void WriteS16Le(byte[] data, int offset, ReadOnlySpan values) 43 | => WriteS16Le(data.AsSpan(offset), values); 44 | 45 | public static void WriteS16Le(Span data, ReadOnlySpan values) 46 | { 47 | var dst = MemoryMarshal.Cast(data); 48 | values.CopyTo(dst); 49 | if (!BitConverter.IsLittleEndian) 50 | { 51 | for (int i = 0; i < values.Length; i++) 52 | dst[i] = BinaryPrimitives.ReverseEndianness(dst[i]); 53 | } 54 | } 55 | 56 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 57 | public static short ReadS16Be(byte[] data, int offset) 58 | => BinaryPrimitives.ReadInt16BigEndian(data.AsSpan(offset)); 59 | 60 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 61 | public static short ReadS16Be(ReadOnlySpan span) 62 | => BinaryPrimitives.ReadInt16BigEndian(span); 63 | 64 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 65 | public static ushort[] ReadU16Le(byte[] data, int offset, int count) 66 | => ReadU16Le(data.AsSpan(offset), count); 67 | 68 | public static ushort[] ReadU16Le(ReadOnlySpan data, int count) 69 | { 70 | var res = MemoryMarshal.Cast(data.Slice(0, count * 2)).ToArray(); 71 | if (!BitConverter.IsLittleEndian) 72 | { 73 | for (int i = 0; i < count; i++) 74 | res[i] = BinaryPrimitives.ReverseEndianness(res[i]); 75 | } 76 | 77 | return res; 78 | } 79 | 80 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 81 | public static ushort ReadU16Le(byte[] data, int offset) 82 | => BinaryPrimitives.ReadUInt16LittleEndian(data.AsSpan(offset)); 83 | 84 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 85 | public static ushort ReadU16Le(ReadOnlySpan span) 86 | => BinaryPrimitives.ReadUInt16LittleEndian(span); 87 | 88 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 89 | public static void WriteU16Le(byte[] data, int offset, ushort value) 90 | => BinaryPrimitives.WriteUInt16LittleEndian(data.AsSpan(offset), value); 91 | 92 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 93 | public static void WriteU16Le(Span span, ushort value) 94 | => BinaryPrimitives.WriteUInt16LittleEndian(span, value); 95 | 96 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 97 | public static void WriteU16Le(byte[] data, int offset, ReadOnlySpan values) 98 | => WriteU16Le(data.AsSpan(offset), values); 99 | 100 | public static void WriteU16Le(Span data, ReadOnlySpan values) 101 | { 102 | var dst = MemoryMarshal.Cast(data); 103 | values.CopyTo(dst); 104 | if (!BitConverter.IsLittleEndian) 105 | { 106 | for (int i = 0; i < values.Length; i++) 107 | dst[i] = BinaryPrimitives.ReverseEndianness(dst[i]); 108 | } 109 | } 110 | 111 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 112 | public static ushort ReadU16Be(byte[] data, int offset) 113 | => BinaryPrimitives.ReadUInt16BigEndian(data.AsSpan(offset)); 114 | 115 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 116 | public static ushort ReadU16Be(ReadOnlySpan span) 117 | => BinaryPrimitives.ReadUInt16BigEndian(span); 118 | 119 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 120 | public static void WriteU16Be(byte[] data, int offset, ushort value) 121 | => BinaryPrimitives.WriteUInt16BigEndian(data.AsSpan(offset), value); 122 | 123 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 124 | public static void WriteU16Be(Span span, ushort value) 125 | => BinaryPrimitives.WriteUInt16BigEndian(span, value); 126 | 127 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 128 | public static uint ReadU24Le(byte[] data, int offset) 129 | => (uint)(data[offset] | data[offset + 1] << 8 | data[offset + 2] << 16); 130 | 131 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 132 | public static uint ReadU24Le(ReadOnlySpan span) 133 | => (uint)(span[0] | span[1] << 8 | span[2] << 16); 134 | 135 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 136 | public static uint ReadU32Le(byte[] data, int offset) 137 | => BinaryPrimitives.ReadUInt32LittleEndian(data.AsSpan(offset)); 138 | 139 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 140 | public static uint ReadU32Le(ReadOnlySpan span) 141 | => BinaryPrimitives.ReadUInt32LittleEndian(span); 142 | 143 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 144 | public static uint[] ReadU32Le(byte[] data, int offset, int count) 145 | => ReadU32Le(data.AsSpan(offset), count); 146 | 147 | public static uint[] ReadU32Le(ReadOnlySpan data, int count) 148 | { 149 | var res = MemoryMarshal.Cast(data.Slice(0, count * 4)).ToArray(); 150 | if (!BitConverter.IsLittleEndian) 151 | { 152 | for (int i = 0; i < count; i++) 153 | res[i] = BinaryPrimitives.ReverseEndianness(res[i]); 154 | } 155 | 156 | return res; 157 | } 158 | 159 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 160 | public static uint ReadU32Be(byte[] data, int offset) 161 | => BinaryPrimitives.ReadUInt32BigEndian(data.AsSpan(offset)); 162 | 163 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 164 | public static uint ReadU32Be(ReadOnlySpan span) 165 | => BinaryPrimitives.ReadUInt32BigEndian(span); 166 | 167 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 168 | public static void WriteU32Le(byte[] data, int offset, uint value) 169 | => BinaryPrimitives.WriteUInt32LittleEndian(data.AsSpan(offset), value); 170 | 171 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 172 | public static void WriteU32Le(Span span, uint value) 173 | => BinaryPrimitives.WriteUInt32LittleEndian(span, value); 174 | 175 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 176 | public static void WriteU32Le(byte[] data, int offset, ReadOnlySpan values) 177 | => WriteU32Le(data.AsSpan(offset), values); 178 | 179 | public static void WriteU32Le(Span data, ReadOnlySpan values) 180 | { 181 | var dst = MemoryMarshal.Cast(data); 182 | values.CopyTo(dst); 183 | if (!BitConverter.IsLittleEndian) 184 | { 185 | for (int i = 0; i < values.Length; i++) 186 | dst[i] = BinaryPrimitives.ReverseEndianness(dst[i]); 187 | } 188 | } 189 | 190 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 191 | public static ulong ReadU64Le(byte[] data, int offset) 192 | => BinaryPrimitives.ReadUInt64LittleEndian(data.AsSpan(offset)); 193 | 194 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 195 | public static ulong ReadU64Le(ReadOnlySpan span) 196 | => BinaryPrimitives.ReadUInt64LittleEndian(span); 197 | 198 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 199 | public static ulong ReadU64Be(byte[] data, int offset) 200 | => BinaryPrimitives.ReadUInt64BigEndian(data.AsSpan(offset)); 201 | 202 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 203 | public static ulong ReadU64Be(ReadOnlySpan span) 204 | => BinaryPrimitives.ReadUInt64BigEndian(span); 205 | 206 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 207 | public static void WriteU64Le(byte[] data, int offset, ulong value) 208 | => BinaryPrimitives.WriteUInt64LittleEndian(data.AsSpan(offset), value); 209 | 210 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 211 | public static void WriteU64Le(Span span, ulong value) 212 | => BinaryPrimitives.WriteUInt64LittleEndian(span, value); 213 | 214 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 215 | public static void WriteU64Be(byte[] data, int offset, ulong value) 216 | => BinaryPrimitives.WriteUInt64BigEndian(data.AsSpan(offset), value); 217 | 218 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 219 | public static void WriteU64Be(Span span, ulong value) 220 | => BinaryPrimitives.WriteUInt64BigEndian(span, value); 221 | } -------------------------------------------------------------------------------- /GCDTool/Program.cs: -------------------------------------------------------------------------------- 1 | using CommandLine; 2 | using CommandLine.Text; 3 | using GCDTool.Elf; 4 | using GCDTool.IO; 5 | using GCDTool.Wram; 6 | using Org.BouncyCastle.Crypto.Parameters; 7 | using Org.BouncyCastle.Security; 8 | using System.Security.Cryptography; 9 | using System.Text; 10 | 11 | namespace GCDTool; 12 | 13 | static class Program 14 | { 15 | private const string GCDTOOL_HEADING = "== GCDTool by Gericom =="; 16 | private const string AES_CIPHER_NAME = "AES/CTR/NoPadding"; 17 | private const string ALGORITHM_AES = "AES"; 18 | private const int AES_BLOCK_SIZE = 16; 19 | private const uint ROM_CONTROL = 0x00416657; 20 | private const uint ROM_CONTROL_SECURE = 0x081808F8; 21 | private const ushort SECURE_AREA_DELAY = 3454; 22 | 23 | private static ReadOnlySpan AesKeyX 24 | => [0x4E, 0x69, 0x6E, 0x74, 0x65, 0x6E, 0x64, 0x6F, 0x20, 0x44, 0x53, 0x00, 0x01, 0x23, 0x21, 0x00]; 25 | 26 | private static void Main(string[] args) 27 | { 28 | var parser = new Parser(with => with.HelpWriter = null); 29 | var parserResult = parser.ParseArguments(args); 30 | parserResult 31 | .WithParsed(RunOptions) 32 | .WithNotParsed(_ => 33 | { 34 | Console.WriteLine(HelpText.AutoBuild(parserResult, h => 35 | { 36 | h.AutoVersion = false; 37 | h.Copyright = string.Empty; 38 | h.Heading = GCDTOOL_HEADING; 39 | return HelpText.DefaultParsingErrorsHandler(parserResult, h); 40 | }, e => e)); 41 | }); 42 | } 43 | 44 | private static void RunOptions(CommandLineOptions options) 45 | { 46 | if (options.GameCode.Length != 4) 47 | { 48 | Console.WriteLine("Invalid game code specified. Should be 4 characters."); 49 | return; 50 | } 51 | 52 | uint gameCode = IOUtil.ReadU32Le(Encoding.ASCII.GetBytes(options.GameCode)); 53 | 54 | // This can be any key, used for encryption of the arm7 and arm9 binaries. 55 | // To have reproducable results, we'll simply use an all-zeros key. 56 | byte[] aesKeyY = new byte[16]; 57 | 58 | var gcdRom = new GcdRom 59 | { 60 | Header = new GcdHeader 61 | { 62 | GameCode = gameCode, 63 | 64 | RomControl = ROM_CONTROL, 65 | RomControlSecure = ROM_CONTROL_SECURE, 66 | SecureAreaDelay = SECURE_AREA_DELAY, 67 | 68 | // it appears to be unnecessary to specify the rom area 69 | NitroRomRegionEnd = 0, 70 | TwlRomRegionStart = 0, 71 | 72 | Flags = options.Arm9Speed67MHz ? 0 : GcdHeaderFlags.Arm9Speed134MHz 73 | }, 74 | }; 75 | 76 | var signature = new GcdSignature(); 77 | aesKeyY.CopyTo(signature.AesKeyY, 0); 78 | 79 | if (!TryLoadArm9(options.Arm9Path, gcdRom, signature) || 80 | !TryLoadArm7(options.Arm7Path, gcdRom, signature) || 81 | !TryLoadWramConfig(options.WramConfigJsonPath, gcdRom)) 82 | { 83 | return; 84 | } 85 | 86 | gcdRom.Header.GetSha1Hash(signature.HeaderSha1); 87 | var signedSignature = signature.ToSignedByteArray(options.GcdKeyPath); 88 | signedSignature.CopyTo(gcdRom.Header.Signature, 0); 89 | 90 | using (var stream = File.Create(options.OutputPath)) 91 | { 92 | gcdRom.Write(stream); 93 | } 94 | } 95 | 96 | private static bool TryLoadArm9(string arm9ElfPath, GcdRom gcdRom, GcdSignature signature) 97 | { 98 | var arm9Data = ParseElf(arm9ElfPath, out uint arm9LoadAddress); 99 | if (arm9LoadAddress < 0x03000000) 100 | { 101 | Console.WriteLine("Error: ARM9 binary cannot be loaded to main memory. Use TWL wram instead."); 102 | return false; 103 | } 104 | gcdRom.Header.Arm9LoadAddress = arm9LoadAddress; 105 | gcdRom.Header.Arm9Size = (uint)arm9Data.Length; 106 | SHA1.HashData(arm9Data, signature.Arm9Sha1); 107 | 108 | if ((arm9Data.Length % 512) != 0) 109 | { 110 | arm9Data = [.. arm9Data, .. new byte[512 - (arm9Data.Length % 512)]]; 111 | } 112 | gcdRom.Header.Arm9PaddedSize = (uint)arm9Data.Length; 113 | EncryptAes(arm9Data, signature.AesKeyY); 114 | gcdRom.EncryptedArm9Binary = arm9Data; 115 | gcdRom.Header.Arm9RomOffset = 0x4000; 116 | return true; 117 | } 118 | 119 | private static bool TryLoadArm7(string arm7ElfPath, GcdRom gcdRom, GcdSignature signature) 120 | { 121 | var arm7Data = ParseElf(arm7ElfPath, out uint arm7LoadAddress); 122 | if (arm7LoadAddress < 0x03000000) 123 | { 124 | Console.WriteLine("Error: ARM7 binary cannot be loaded to main memory. Use TWL wram instead."); 125 | return false; 126 | } 127 | gcdRom.Header.Arm7LoadAddress = arm7LoadAddress; 128 | gcdRom.Header.Arm7Size = (uint)arm7Data.Length; 129 | SHA1.HashData(arm7Data, signature.Arm7Sha1); 130 | 131 | if ((arm7Data.Length % 512) != 0) 132 | { 133 | arm7Data = [.. arm7Data, .. new byte[512 - (arm7Data.Length % 512)]]; 134 | } 135 | gcdRom.Header.Arm7PaddedSize = (uint)arm7Data.Length; 136 | EncryptAes(arm7Data, signature.AesKeyY); 137 | gcdRom.EncryptedArm7Binary = arm7Data; 138 | gcdRom.Header.Arm7RomOffset = (uint)(0x4000 + gcdRom.EncryptedArm9Binary.Length); 139 | return true; 140 | } 141 | 142 | private static byte[] ParseElf(string elfPath, out uint loadAddress) 143 | { 144 | loadAddress = 0; 145 | var elf = new ElfFile(File.ReadAllBytes(elfPath)); 146 | var programData = new MemoryStream(); 147 | bool loadAddressSet = false; 148 | foreach (var programHeader in elf.ProgramHeaderTable) 149 | { 150 | if (programHeader.SegmentType == ProgramHeaderTableEntry.ElfSegmentType.Load && 151 | programHeader.SegmentData is not null && 152 | programHeader.SegmentData.Length != 0) 153 | { 154 | if (!loadAddressSet) 155 | { 156 | loadAddress = programHeader.PhysicalAddress; 157 | loadAddressSet = true; 158 | } 159 | programData.Write(programHeader.SegmentData); 160 | } 161 | } 162 | 163 | return programData.ToArray(); 164 | } 165 | 166 | private static void ByteSwapAesBlocks(Span data) 167 | { 168 | for (int i = 0; i < data.Length; i += AES_BLOCK_SIZE) 169 | { 170 | data.Slice(i, AES_BLOCK_SIZE).Reverse(); 171 | } 172 | } 173 | 174 | private static byte[] CreateAesInitializationVector(uint dataLength) 175 | { 176 | var iv = new byte[16]; 177 | IOUtil.WriteU32Le(iv, 0, dataLength); 178 | IOUtil.WriteU32Le(iv, 4, (uint)-dataLength); 179 | IOUtil.WriteU32Le(iv, 8, ~dataLength); 180 | return iv; 181 | } 182 | 183 | private static void EncryptAes(Span data, ReadOnlySpan keyY) 184 | { 185 | var scrambledKey = AesKeyScrambler.Scramble(AesKeyX, keyY); 186 | Array.Reverse(scrambledKey); 187 | ByteSwapAesBlocks(data); 188 | var iv = CreateAesInitializationVector((uint)data.Length); 189 | Array.Reverse(iv); 190 | var cipher = CipherUtilities.GetCipher(AES_CIPHER_NAME); 191 | cipher.Init(true, new ParametersWithIV( 192 | ParameterUtilities.CreateKeyParameter(ALGORITHM_AES, scrambledKey), iv)); 193 | cipher.ProcessBytes(data, data); 194 | cipher.DoFinal(data); 195 | ByteSwapAesBlocks(data); 196 | } 197 | 198 | private static bool TryLoadWramConfig(string wramConfigJsonPath, GcdRom gcdRom) 199 | { 200 | try 201 | { 202 | string wramConfigJson = File.ReadAllText(wramConfigJsonPath); 203 | gcdRom.Header.WramConfiguration = new WramConfigJsonReader().ReadWramConfigFromJson(wramConfigJson); 204 | return true; 205 | } 206 | catch (Exception exception) 207 | { 208 | Console.WriteLine("Failed to parse wram configuration JSON: " + exception.Message); 209 | return false; 210 | } 211 | } 212 | } 213 | -------------------------------------------------------------------------------- /GCDTool/Wram/NtrWramMaster.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Wram; 2 | 3 | /// 4 | /// The master of a NTR wram block. 5 | /// 6 | enum NtrWramMaster 7 | { 8 | Arm9 = 0, 9 | Arm7 = 1 10 | } -------------------------------------------------------------------------------- /GCDTool/Wram/WramABlockMapping.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Wram; 2 | 3 | /// 4 | /// Specifies the mapping of TWL wram A block. 5 | /// 6 | readonly record struct WramABlockMapping(WramAMaster Master, WramASlot Slot, bool Enable) 7 | { 8 | public static explicit operator byte(WramABlockMapping wramABlockMapping) 9 | { 10 | return (byte)(((byte)wramABlockMapping.Master & 1) 11 | | (((byte)wramABlockMapping.Slot & 3) << 2) 12 | | (wramABlockMapping.Enable ? 0x80 : 0)); 13 | } 14 | } -------------------------------------------------------------------------------- /GCDTool/Wram/WramAMappedSlots.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Wram; 2 | 3 | /// 4 | /// Specifies which TWL wram A slots are mapped in memory. 5 | /// 6 | enum WramAMappedSlots 7 | { 8 | /// 9 | /// Only slot 0 mapped. 64 kB mirrors. 10 | /// 11 | Slot0 = 0, 12 | 13 | /// 14 | /// Slot 0 and 1 mapped. 128 kB mirrors. 15 | /// 16 | Slot01 = 2, 17 | 18 | /// 19 | /// All slots mapped. 256 kB mirrors. 20 | /// 21 | All = 3 22 | } 23 | -------------------------------------------------------------------------------- /GCDTool/Wram/WramAMapping.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Wram; 2 | 3 | /// 4 | /// Specifies the mapping of TWL wram A in memory. 5 | /// 6 | readonly record struct WramAMapping 7 | { 8 | private const uint WRAM_START_ADDRESS = 0x03000000u; 9 | private const uint WRAM_END_ADDRESS = 0x04000000u; 10 | 11 | private readonly uint _startOffset; 12 | private readonly uint _endOffset; 13 | 14 | /// 15 | /// The WRAM A slots that are mapped and mirrored in memory. 16 | /// 17 | public WramAMappedSlots MappedSlots { get; } 18 | 19 | /// 20 | /// The start address of the WRAM A area in memory. 21 | /// 22 | public uint StartAddress => WRAM_START_ADDRESS + (_startOffset << 16); 23 | 24 | /// 25 | /// The end address of the WRAM A area in memory. 26 | /// 27 | public uint EndAddress => WRAM_START_ADDRESS + (_endOffset << 16); 28 | 29 | public WramAMapping(uint startAddress, uint length, WramAMappedSlots mappedSlots) 30 | { 31 | if (startAddress < WRAM_START_ADDRESS) 32 | { 33 | throw new ArgumentException( 34 | $"Start address (0x{startAddress:X8}) must be at least (0x{WRAM_START_ADDRESS:X8}).", nameof(startAddress)); 35 | } 36 | if ((startAddress & 0xFFFF) != 0) 37 | { 38 | throw new ArgumentException("Start address must be a multiple of 64 kB.", nameof(startAddress)); 39 | } 40 | if ((length & 0xFFFF) != 0) 41 | { 42 | throw new ArgumentException("Length must be a multiple of 64 kB.", nameof(length)); 43 | } 44 | uint endAddress = startAddress + length; 45 | if (endAddress > WRAM_END_ADDRESS) 46 | { 47 | throw new ArgumentException( 48 | $"Length is too large. Resulting end address (0x{endAddress:X8}) must be at most (0x{WRAM_END_ADDRESS:X8}).", 49 | nameof(length)); 50 | } 51 | 52 | _startOffset = (startAddress - WRAM_START_ADDRESS) >> 16; 53 | _endOffset = (endAddress - WRAM_START_ADDRESS) >> 16; 54 | MappedSlots = mappedSlots; 55 | } 56 | 57 | public static explicit operator uint(WramAMapping wramAMapping) 58 | { 59 | return (wramAMapping._startOffset << 4) 60 | | ((uint)wramAMapping.MappedSlots << 12) 61 | | (wramAMapping._endOffset << 20); 62 | } 63 | } 64 | -------------------------------------------------------------------------------- /GCDTool/Wram/WramAMaster.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Wram; 2 | 3 | /// 4 | /// The master of a TWL wram A block. 5 | /// 6 | enum WramAMaster 7 | { 8 | Arm9 = 0, 9 | Arm7 = 1 10 | } -------------------------------------------------------------------------------- /GCDTool/Wram/WramASlot.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Wram; 2 | 3 | /// 4 | /// Specifies a slot of TWL wram A. 5 | /// 6 | enum WramASlot 7 | { 8 | Slot0 = 0, 9 | Slot1 = 1, 10 | Slot2 = 2, 11 | Slot3 = 3 12 | } -------------------------------------------------------------------------------- /GCDTool/Wram/WramBBlockMapping.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Wram; 2 | 3 | /// 4 | /// Specifies the mapping of TWL wram B block. 5 | /// 6 | readonly record struct WramBBlockMapping(WramBMaster Master, WramBCSlot Slot, bool Enable) 7 | { 8 | public static explicit operator byte(WramBBlockMapping wramBBlockMapping) 9 | { 10 | return (byte)(((byte)wramBBlockMapping.Master & 3) 11 | | (((byte)wramBBlockMapping.Slot & 7) << 2) 12 | | (wramBBlockMapping.Enable ? 0x80 : 0)); 13 | } 14 | } -------------------------------------------------------------------------------- /GCDTool/Wram/WramBCMappedSlots.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Wram; 2 | 3 | /// 4 | /// Specifies which TWL wram B or C slots are mapped in memory. 5 | /// 6 | enum WramBCMappedSlots 7 | { 8 | /// 9 | /// Only slot 0 mapped. 32 kB mirrors. 10 | /// 11 | Slot0 = 0, 12 | 13 | /// 14 | /// Only slot 0 and 1 mapped. 64 kB mirrors. 15 | /// 16 | Slot01 = 1, 17 | 18 | /// 19 | /// Only slot 0, 1, 2 and 3 mapped. 128 kB mirrors. 20 | /// 21 | Slot0123 = 2, 22 | 23 | /// 24 | /// All slots mapped. 256 kB mirrors. 25 | /// 26 | All = 3 27 | } -------------------------------------------------------------------------------- /GCDTool/Wram/WramBCMapping.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Wram; 2 | 3 | /// 4 | /// Specifies the mapping of TWL wram B or C in memory. 5 | /// 6 | readonly record struct WramBCMapping 7 | { 8 | private const uint WRAM_START_ADDRESS = 0x03000000u; 9 | private const uint WRAM_END_ADDRESS = 0x04000000u; 10 | 11 | private readonly uint _startOffset; 12 | private readonly uint _endOffset; 13 | 14 | /// 15 | /// The WRAM A slots that are mapped and mirrored in memory. 16 | /// 17 | public WramBCMappedSlots MappedSlots { get; } 18 | 19 | /// 20 | /// The start address of the WRAM B or C area in memory. 21 | /// 22 | public uint StartAddress => WRAM_START_ADDRESS + (_startOffset << 15); 23 | 24 | /// 25 | /// The end address of the WRAM B or C area in memory. 26 | /// 27 | public uint EndAddress => WRAM_START_ADDRESS + (_endOffset << 15); 28 | 29 | public WramBCMapping(uint startAddress, uint length, WramBCMappedSlots mappedSlots) 30 | { 31 | if (startAddress < WRAM_START_ADDRESS) 32 | { 33 | throw new ArgumentException( 34 | $"Start address (0x{startAddress:X8}) must be at least (0x{WRAM_START_ADDRESS:X8}).", nameof(startAddress)); 35 | } 36 | if ((startAddress & 0x7FFF) != 0) 37 | { 38 | throw new ArgumentException("Start address must be a multiple of 32 kB.", nameof(startAddress)); 39 | } 40 | if ((length & 0x7FFF) != 0) 41 | { 42 | throw new ArgumentException("Length must be a multiple of 32 kB.", nameof(length)); 43 | } 44 | uint endAddress = startAddress + length; 45 | if (endAddress > WRAM_END_ADDRESS) 46 | { 47 | throw new ArgumentException( 48 | $"Length is too large. Resulting end address (0x{endAddress:X8}) must be at most (0x{WRAM_END_ADDRESS:X8}).", 49 | nameof(length)); 50 | } 51 | 52 | _startOffset = (startAddress - WRAM_START_ADDRESS) >> 15; 53 | _endOffset = (endAddress - WRAM_START_ADDRESS) >> 15; 54 | MappedSlots = mappedSlots; 55 | } 56 | 57 | public static explicit operator uint(WramBCMapping wramBCMapping) 58 | { 59 | return (wramBCMapping._startOffset << 3) 60 | | ((uint)wramBCMapping.MappedSlots << 12) 61 | | (wramBCMapping._endOffset << 19); 62 | } 63 | } 64 | -------------------------------------------------------------------------------- /GCDTool/Wram/WramBCSlot.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Wram; 2 | 3 | /// 4 | /// Specifies a slot of TWL wram B or C. 5 | /// 6 | enum WramBCSlot 7 | { 8 | Slot0 = 0, 9 | Slot1 = 1, 10 | Slot2 = 2, 11 | Slot3 = 3, 12 | Slot4 = 4, 13 | Slot5 = 5, 14 | Slot6 = 6, 15 | Slot7 = 7 16 | } -------------------------------------------------------------------------------- /GCDTool/Wram/WramBMaster.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Wram; 2 | 3 | /// 4 | /// The master of a TWL wram B block. 5 | /// 6 | enum WramBMaster 7 | { 8 | Arm9 = 0, 9 | Arm7 = 1, 10 | DspCode = 2 11 | } -------------------------------------------------------------------------------- /GCDTool/Wram/WramCBlockMapping.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Wram; 2 | 3 | /// 4 | /// Specifies the mapping of TWL wram C block. 5 | /// 6 | readonly record struct WramCBlockMapping(WramCMaster Master, WramBCSlot Slot, bool Enable) 7 | { 8 | public static explicit operator byte(WramCBlockMapping wramCBlockMapping) 9 | { 10 | return (byte)(((byte)wramCBlockMapping.Master & 3) 11 | | (((byte)wramCBlockMapping.Slot & 7) << 2) 12 | | (wramCBlockMapping.Enable ? 0x80 : 0)); 13 | } 14 | } -------------------------------------------------------------------------------- /GCDTool/Wram/WramCMaster.cs: -------------------------------------------------------------------------------- 1 | namespace GCDTool.Wram; 2 | 3 | /// 4 | /// The master of a TWL wram C block. 5 | /// 6 | enum WramCMaster 7 | { 8 | Arm9 = 0, 9 | Arm7 = 1, 10 | DspData = 2 11 | } -------------------------------------------------------------------------------- /GCDTool/Wram/WramConfig.cs: -------------------------------------------------------------------------------- 1 | using GCDTool.IO; 2 | 3 | namespace GCDTool.Wram; 4 | 5 | /// 6 | /// Class representing the initial wram configuration. 7 | /// 8 | sealed class WramConfig 9 | { 10 | /// 11 | /// The block mapping of TWL wram A. 12 | /// 13 | public WramABlockMapping[] TwlWramABlockMapping { get; } = new WramABlockMapping[4]; 14 | 15 | /// 16 | /// The block mapping of TWL wram B. 17 | /// 18 | public WramBBlockMapping[] TwlWramBBlockMapping { get; } = new WramBBlockMapping[8]; 19 | 20 | /// 21 | /// The block mapping of TWL wram C. 22 | /// 23 | public WramCBlockMapping[] TwlWramCBlockMapping { get; } = new WramCBlockMapping[8]; 24 | 25 | /// 26 | /// The mapping of TWL wram A on the ARM9. 27 | /// 28 | public WramAMapping Arm9TwlWramAMapping { get; set; } 29 | 30 | /// 31 | /// The mapping of TWL wram B on the ARM9. 32 | /// 33 | public WramBCMapping Arm9TwlWramBMapping { get; set; } 34 | 35 | /// 36 | /// The mapping of TWL wram C on the ARM9. 37 | /// 38 | public WramBCMapping Arm9TwlWramCMapping { get; set; } 39 | 40 | /// 41 | /// The mapping of TWL wram A on the ARM7. 42 | /// 43 | public WramAMapping Arm7TwlWramAMapping { get; set; } 44 | 45 | /// 46 | /// The mapping of TWL wram B on the ARM7. 47 | /// 48 | public WramBCMapping Arm7TwlWramBMapping { get; set; } 49 | 50 | /// 51 | /// The mapping of TWL wram C on the ARM7. 52 | /// 53 | public WramBCMapping Arm7TwlWramCMapping { get; set; } 54 | 55 | /// 56 | /// For each TWL wram A block when locked, or otherwise. 57 | /// 58 | public bool[] TwlWramABlockLocked { get; } = new bool[4]; 59 | 60 | /// 61 | /// For each TWL wram B block when locked, or otherwise. 62 | /// 63 | public bool[] TwlWramBBlockLocked { get; } = new bool[8]; 64 | 65 | /// 66 | /// For each TWL wram C block when locked, or otherwise. 67 | /// 68 | public bool[] TwlWramCBlockLocked { get; } = new bool[8]; 69 | 70 | /// 71 | /// The mapping of nitro wram. 72 | /// 73 | public NtrWramMaster[] NtrWramMapping { get; } = new NtrWramMaster[2]; 74 | 75 | /// 76 | /// The mapping of vram C. 77 | /// 78 | public byte VramCMapping { get; set; } 79 | 80 | /// 81 | /// The mapping of vram D. 82 | /// 83 | public byte VramDMapping { get; set; } 84 | 85 | /// 86 | /// Writes the wram configuration to the given span. 87 | /// 88 | /// 89 | public void Write(Span destination) 90 | { 91 | for (int i = 0; i < 4; i++) 92 | { 93 | destination[i] = (byte)TwlWramABlockMapping[i]; 94 | } 95 | for (int i = 0; i < 8; i++) 96 | { 97 | destination[4 + i] = (byte)TwlWramBBlockMapping[i]; 98 | destination[12 + i] = (byte)TwlWramCBlockMapping[i]; 99 | } 100 | IOUtil.WriteU32Le(destination[0x14..], (uint)Arm9TwlWramAMapping); 101 | IOUtil.WriteU32Le(destination[0x18..], (uint)Arm9TwlWramBMapping); 102 | IOUtil.WriteU32Le(destination[0x1C..], (uint)Arm9TwlWramCMapping); 103 | IOUtil.WriteU32Le(destination[0x20..], (uint)Arm7TwlWramAMapping); 104 | IOUtil.WriteU32Le(destination[0x24..], (uint)Arm7TwlWramBMapping); 105 | IOUtil.WriteU32Le(destination[0x28..], (uint)Arm7TwlWramCMapping); 106 | destination[0x2C] = CreateLockMask(TwlWramABlockLocked); 107 | destination[0x2D] = CreateLockMask(TwlWramBBlockLocked); 108 | destination[0x2E] = CreateLockMask(TwlWramCBlockLocked); 109 | destination[0x2F] = (byte)(((byte)NtrWramMapping[0] & 1) | (((byte)NtrWramMapping[1] & 1) << 1) 110 | | (VramCMapping & 7) << 2 | (VramDMapping & 7) << 5); 111 | } 112 | 113 | private byte CreateLockMask(ReadOnlySpan locks) 114 | { 115 | byte wramLocks = 0; 116 | for (int i = 0; i < locks.Length; i++) 117 | { 118 | if (locks[i]) 119 | { 120 | wramLocks |= (byte)(1 << i); 121 | } 122 | } 123 | 124 | return wramLocks; 125 | } 126 | } 127 | -------------------------------------------------------------------------------- /GCDTool/Wram/WramConfigJsonReader.cs: -------------------------------------------------------------------------------- 1 | using System.ComponentModel; 2 | using System.Text.Json; 3 | using System.Text.Json.Serialization; 4 | 5 | namespace GCDTool.Wram; 6 | 7 | /// 8 | /// Class for reading from a JSON file. 9 | /// 10 | sealed class WramConfigJsonReader 11 | { 12 | private const int WRAM_A_BLOCK_COUNT = 4; 13 | private const int WRAM_BC_BLOCK_COUNT = 8; 14 | 15 | private const string MASTER_ARM9 = "arm9"; 16 | private const string MASTER_ARM7 = "arm7"; 17 | private const string MASTER_DSP = "dsp"; 18 | 19 | private const string SLOT_0 = "0"; 20 | private const string SLOT_01 = "01"; 21 | private const string SLOT_0123 = "0123"; 22 | private const string SLOT_01234567 = "01234567"; 23 | private const string SLOT_ALL = "all"; 24 | 25 | /// 26 | /// Reads a from the given . 27 | /// 28 | /// The JSON string containing the WRAM configuration. 29 | /// The constructed . 30 | public WramConfig ReadWramConfigFromJson(string jsonString) 31 | { 32 | var wramConfig = new WramConfig(); 33 | var json = JsonDocument.Parse(jsonString).RootElement; 34 | ParseWramAConfig(wramConfig, json.GetProperty("wramA")); 35 | ParseWramBConfig(wramConfig, json.GetProperty("wramB")); 36 | ParseWramCConfig(wramConfig, json.GetProperty("wramC")); 37 | 38 | var ntrWram = json.GetProperty("ntrWram"); 39 | if (ntrWram.GetArrayLength() != 2) 40 | { 41 | throw new InvalidDataException("'ntrWram' array should have exactly 2 items."); 42 | } 43 | 44 | wramConfig.NtrWramMapping[0] = ParseNtrWramMapping(ntrWram[0].GetString()); 45 | wramConfig.NtrWramMapping[1] = ParseNtrWramMapping(ntrWram[1].GetString()); 46 | wramConfig.VramCMapping = json.GetProperty("vramC").GetByte(); 47 | wramConfig.VramDMapping = json.GetProperty("vramD").GetByte(); 48 | return wramConfig; 49 | } 50 | 51 | private void ParseWramAConfig(WramConfig wramConfig, JsonElement wramAJson) 52 | { 53 | wramConfig.Arm9TwlWramAMapping = wramAJson.TryGetProperty("arm9", out var arm9) 54 | ? ParseWramAMapping(arm9) 55 | : new WramAMapping(0x03000000, 0, WramAMappedSlots.Slot0); // unmapped 56 | 57 | wramConfig.Arm7TwlWramAMapping = wramAJson.TryGetProperty("arm7", out var arm7) 58 | ? ParseWramAMapping(arm7) 59 | : new WramAMapping(0x03000000, 0, WramAMappedSlots.Slot0); // unmapped 60 | 61 | var blocks = wramAJson.GetProperty("blocks"); 62 | if (blocks.GetArrayLength() != WRAM_A_BLOCK_COUNT) 63 | { 64 | throw new InvalidDataException($"Wram A 'blocks' array should have exactly {WRAM_A_BLOCK_COUNT} items."); 65 | } 66 | for (int i = 0; i < WRAM_A_BLOCK_COUNT; i++) 67 | { 68 | wramConfig.TwlWramABlockMapping[i] = ParseWramABlockMapping( 69 | blocks[i], out wramConfig.TwlWramABlockLocked[i]); 70 | } 71 | } 72 | 73 | private void ParseWramBConfig(WramConfig wramConfig, JsonElement wramBJson) 74 | { 75 | wramConfig.Arm9TwlWramBMapping = wramBJson.TryGetProperty("arm9", out var arm9) 76 | ? ParseWramBCMapping(arm9) 77 | : new WramBCMapping(0x03000000, 0, WramBCMappedSlots.Slot0); // unmapped 78 | 79 | wramConfig.Arm7TwlWramBMapping = wramBJson.TryGetProperty("arm7", out var arm7) 80 | ? ParseWramBCMapping(arm7) 81 | : new WramBCMapping(0x03000000, 0, WramBCMappedSlots.Slot0); // unmapped 82 | 83 | var blocks = wramBJson.GetProperty("blocks"); 84 | if (blocks.GetArrayLength() != WRAM_BC_BLOCK_COUNT) 85 | { 86 | throw new InvalidDataException($"Wram B 'blocks' array should have exactly {WRAM_BC_BLOCK_COUNT} items."); 87 | } 88 | for (int i = 0; i < WRAM_BC_BLOCK_COUNT; i++) 89 | { 90 | wramConfig.TwlWramBBlockMapping[i] = ParseWramBBlockMapping( 91 | blocks[i], out wramConfig.TwlWramBBlockLocked[i]); 92 | } 93 | } 94 | 95 | private void ParseWramCConfig(WramConfig wramConfig, JsonElement wramCJson) 96 | { 97 | wramConfig.Arm9TwlWramCMapping = wramCJson.TryGetProperty("arm9", out var arm9) 98 | ? ParseWramBCMapping(arm9) 99 | : new WramBCMapping(0x03000000, 0, WramBCMappedSlots.Slot0); // unmapped 100 | 101 | wramConfig.Arm7TwlWramCMapping = wramCJson.TryGetProperty("arm7", out var arm7) 102 | ? ParseWramBCMapping(arm7) 103 | : new WramBCMapping(0x03000000, 0, WramBCMappedSlots.Slot0); // unmapped 104 | 105 | var blocks = wramCJson.GetProperty("blocks"); 106 | if (blocks.GetArrayLength() != WRAM_BC_BLOCK_COUNT) 107 | { 108 | throw new InvalidDataException($"Wram C 'blocks' array should have exactly {WRAM_BC_BLOCK_COUNT} items."); 109 | } 110 | for (int i = 0; i < WRAM_BC_BLOCK_COUNT; i++) 111 | { 112 | wramConfig.TwlWramCBlockMapping[i] = ParseWramCBlockMapping( 113 | blocks[i], out wramConfig.TwlWramCBlockLocked[i]); 114 | } 115 | } 116 | 117 | private WramAMapping ParseWramAMapping(JsonElement mappingJson) 118 | { 119 | var wramMapping = mappingJson.Deserialize() 120 | ?? throw new InvalidDataException("Could not parse wram A mapping."); 121 | return new( 122 | ParseHexString(wramMapping.Start), 123 | ParseHexString(wramMapping.Length), 124 | wramMapping.Slots switch 125 | { 126 | SLOT_0 => WramAMappedSlots.Slot0, 127 | SLOT_01 => WramAMappedSlots.Slot01, 128 | SLOT_0123 or SLOT_ALL => WramAMappedSlots.All, 129 | _ => throw new InvalidDataException("Invalid value specified for wram A 'slots'.") 130 | }); 131 | } 132 | 133 | private WramBCMapping ParseWramBCMapping(JsonElement mappingJson) 134 | { 135 | var wramMapping = mappingJson.Deserialize() 136 | ?? throw new InvalidDataException("Could not parse wram B or C mapping."); 137 | return new( 138 | ParseHexString(wramMapping.Start), 139 | ParseHexString(wramMapping.Length), 140 | wramMapping.Slots switch 141 | { 142 | SLOT_0 => WramBCMappedSlots.Slot0, 143 | SLOT_01 => WramBCMappedSlots.Slot01, 144 | SLOT_0123 => WramBCMappedSlots.Slot0123, 145 | SLOT_01234567 or SLOT_ALL => WramBCMappedSlots.All, 146 | _ => throw new InvalidDataException("Invalid value specified for wram B or C 'slots'.") 147 | }); 148 | } 149 | 150 | private WramABlockMapping ParseWramABlockMapping(JsonElement blockMappingJson, out bool locked) 151 | { 152 | var blockMapping = blockMappingJson.Deserialize() 153 | ?? throw new InvalidDataException("Could not parse wram A block mapping."); 154 | if (blockMapping.Slot >= WRAM_A_BLOCK_COUNT) 155 | { 156 | throw new InvalidDataException("Invalid slot specified for wram A block mapping."); 157 | } 158 | locked = blockMapping.Locked; 159 | return new( 160 | blockMapping.Master switch 161 | { 162 | MASTER_ARM7 => WramAMaster.Arm7, 163 | MASTER_ARM9 => WramAMaster.Arm9, 164 | _ => throw new InvalidDataException("Invalid master specified for wram A block mapping.") 165 | }, 166 | (WramASlot)blockMapping.Slot, 167 | blockMapping.Enabled); 168 | } 169 | 170 | private WramBBlockMapping ParseWramBBlockMapping(JsonElement blockMappingJson, out bool locked) 171 | { 172 | var blockMapping = blockMappingJson.Deserialize() 173 | ?? throw new InvalidDataException("Could not parse wram B block mapping."); 174 | if (blockMapping.Slot >= WRAM_BC_BLOCK_COUNT) 175 | { 176 | throw new InvalidDataException("Invalid slot specified for wram B block mapping."); 177 | } 178 | locked = blockMapping.Locked; 179 | return new( 180 | blockMapping.Master switch 181 | { 182 | MASTER_ARM9 => WramBMaster.Arm9, 183 | MASTER_ARM7 => WramBMaster.Arm7, 184 | MASTER_DSP => WramBMaster.DspCode, 185 | _ => throw new InvalidDataException("Invalid master specified for wram B block mapping.") 186 | }, 187 | (WramBCSlot)blockMapping.Slot, 188 | blockMapping.Enabled); 189 | } 190 | 191 | private WramCBlockMapping ParseWramCBlockMapping(JsonElement blockMappingJson, out bool locked) 192 | { 193 | var blockMapping = blockMappingJson.Deserialize() 194 | ?? throw new InvalidDataException("Could not parse wram C block mapping."); 195 | if (blockMapping.Slot >= WRAM_BC_BLOCK_COUNT) 196 | { 197 | throw new InvalidDataException("Invalid slot specified for wram C block mapping."); 198 | } 199 | locked = blockMapping.Locked; 200 | return new( 201 | blockMapping.Master switch 202 | { 203 | MASTER_ARM9 => WramCMaster.Arm9, 204 | MASTER_ARM7 => WramCMaster.Arm7, 205 | MASTER_DSP => WramCMaster.DspData, 206 | _ => throw new InvalidDataException("Invalid master specified for wram C block mapping.") 207 | }, 208 | (WramBCSlot)blockMapping.Slot, 209 | blockMapping.Enabled); 210 | } 211 | 212 | private NtrWramMaster ParseNtrWramMapping(string? mapping) => mapping switch 213 | { 214 | MASTER_ARM9 => NtrWramMaster.Arm9, 215 | MASTER_ARM7 => NtrWramMaster.Arm7, 216 | _ => throw new InvalidDataException("Invalid master specified for ntr wram mapping.") 217 | }; 218 | 219 | private uint ParseHexString(string hexString) 220 | { 221 | if (new UInt32Converter().ConvertFromString(hexString) is not uint value) 222 | { 223 | throw new InvalidDataException("Invalid start address or length specified."); 224 | } 225 | return value; 226 | } 227 | 228 | private sealed class JsonWramMapping 229 | { 230 | [JsonPropertyName("start")] 231 | public string Start { get; set; } = "0x03000000"; 232 | 233 | [JsonPropertyName("length")] 234 | public string Length { get; set; } = "0"; 235 | 236 | [JsonPropertyName("slots")] 237 | public string Slots { get; set; } = SLOT_0; 238 | } 239 | 240 | private sealed class JsonBlockMapping 241 | { 242 | [JsonPropertyName("master")] 243 | public string Master { get; set; } = MASTER_ARM9; 244 | 245 | [JsonPropertyName("slot")] 246 | public uint Slot { get; set; } = 0; 247 | 248 | [JsonPropertyName("enabled")] 249 | public bool Enabled { get; set; } = true; 250 | 251 | [JsonPropertyName("locked")] 252 | public bool Locked { get; set; } = false; 253 | } 254 | } 255 | -------------------------------------------------------------------------------- /readme.md: -------------------------------------------------------------------------------- 1 | # GCDTool 2 | Tool to create a GCD rom for DSi ntrboot. 3 | 4 | ## Usage 5 | `GCDTool --arm9 arm9.elf --arm7 arm7.elf --wram wramConfig.json --rsakey gcdKey.der output.gcd` 6 | 7 | ### Arguments 8 | #### Mandatory 9 | - `--arm9` specifies the arm9 elf file; 10 | - `--arm7` specifies the arm7 elf file; 11 | - `--wram` specifies the wram configuration json file (see below); 12 | - `--rsakey` specifies the der file with the RSA private key to use. 13 | 14 | The arm7 and arm9 binaries should have a load address in internal ram (for example TWL wram), as main memory is not yet enabled when the GCD rom is booted. 15 | 16 | #### Optional 17 | - `--gamecode` specifies the 4 character game code to use (default: ####); 18 | - `--arm9-67-mhz` runs the arm9 at 67 MHz instead of 134 MHz. 19 | 20 | ### Wram configuration JSON file 21 | Specifies the initial wram configuration to use. 22 | 23 | #### Example 24 | ```json 25 | { 26 | "wramA": { 27 | "arm7": { "start": "0x03800000", "length": "0x40000", "slots": "all" }, 28 | "blocks": [ 29 | { "master": "arm7", "slot": 0 }, 30 | { "master": "arm7", "slot": 1 }, 31 | { "master": "arm7", "slot": 2 }, 32 | { "master": "arm7", "slot": 3 } 33 | ] 34 | }, 35 | "wramB": { 36 | "arm9": { "start": "0x03800000", "length": "0x40000", "slots": "all" }, 37 | "blocks": [ 38 | { "master": "arm9", "slot": 0 }, 39 | { "master": "arm9", "slot": 1 }, 40 | { "master": "arm9", "slot": 2 }, 41 | { "master": "arm9", "slot": 3 }, 42 | { "master": "arm9", "slot": 4 }, 43 | { "master": "arm9", "slot": 5 }, 44 | { "master": "arm9", "slot": 6 }, 45 | { "master": "arm9", "slot": 7 } 46 | ] 47 | }, 48 | "wramC": { 49 | "arm9": { "start": "0x03840000", "length": "0x40000", "slots": "all" }, 50 | "blocks": [ 51 | { "master": "arm9", "slot": 0 }, 52 | { "master": "arm9", "slot": 1 }, 53 | { "master": "arm9", "slot": 2 }, 54 | { "master": "arm9", "slot": 3 }, 55 | { "master": "arm9", "slot": 4 }, 56 | { "master": "arm9", "slot": 5 }, 57 | { "master": "arm9", "slot": 6 }, 58 | { "master": "arm9", "slot": 7 } 59 | ] 60 | }, 61 | "ntrWram" : [ "arm7", "arm7" ], 62 | "vramC": 7, 63 | "vramD": 7 64 | } 65 | ``` 66 | 67 | #### TWL wram mapping 68 | For TWL wram A, B and C the mapping in memory can be specified for both the arm9 and arm7 side with the `"arm9"` and `"arm7"` properties (can be omitted to not map the ram at all). Start and length must be 64 kB aligned for wram A, and 32 kB aligned for wram B and C. `"slots"` specifies which slots are actually mapped in memory, and as such also the size of the mirroring. For wram A the options are `"0"` (64 kB), `"01"` (128 kB) and `"all"` or `"0123"` (256 kB). For wram B and C the options are `"0"` (32 kB), `"01"` (64 kB), `"0123"` (128 kB) and `"all"` or `"01234567"` (256 kB). 69 | 70 | #### TWL wram block mapping 71 | For each block of TWL wram the following properties are available: 72 | - `"master"` specifies what the block is mapped to. All wrams support `"arm9"` and `"arm7"`, and wram B and C additionally support `"dsp"` for dsp code and data respectively; 73 | - `"slot"` specifies the slot the block is mapped to; 74 | - `"enabled"` specifies whether the block is enabled. This defaults to `true` and can be omitted; 75 | - `"locked"` specifies whether the mapping of the block should be locked, such that the arm9 cannot change it. This defaults to `false` and can be omitted. 76 | 77 | When `"enabled"` is set to `false`, `"master"` and `"slot"` can be omitted. 78 | 79 | #### NTR wram mapping 80 | Specifies for the two NTR wram blocks whether they are mapped to `"arm9"` or `"arm7"`. 81 | 82 | #### Vram mapping 83 | Not sure how this works. There are only 3 bits available, but the vram C and D mapping registers need more bits properly specify the mapping and enable it. Default value is 7 for both. 84 | 85 | ## Booting the GCD rom 86 | The GCD rom needs to be flashed to a (dev) flashcard or other means of emulating a DS cartridge. Make sure the blowfish table is used that is included in the generated .gcd file (p table at `0x1600` and s boxes at `0x1C00`). 87 | 88 | With the cartridge inserted, the GCD rom is booted by putting a small magnet between the ABXY buttons (to trigger the lid close detection), holding START, SELECT and X and pressing the power button. 89 | --------------------------------------------------------------------------------