mirror of
https://github.com/SabreTools/NDecrypt.git
synced 2026-04-26 08:09:31 +00:00
876 lines
35 KiB
C#
876 lines
35 KiB
C#
using System;
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using System.IO;
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using SabreTools.IO.Extensions;
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using SabreTools.Models.N3DS;
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using SabreTools.Serialization.Wrappers;
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using static NDecrypt.Core.CommonOperations;
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using static SabreTools.Models.N3DS.Constants;
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namespace NDecrypt.Core
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{
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public class ThreeDSTool : ITool
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{
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/// <summary>
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/// Decryption args to use while processing
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/// </summary>
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private readonly DecryptArgs _decryptArgs;
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/// <summary>
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/// Indicates if development images are expected
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/// </summary>
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private readonly bool _development;
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/// <summary>
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/// Set of all partition keys
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/// </summary>
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private readonly PartitionKeys[] KeysMap = new PartitionKeys[8];
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public ThreeDSTool(bool development, DecryptArgs decryptArgs)
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{
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_development = development;
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_decryptArgs = decryptArgs;
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}
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/// <inheritdoc/>
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public bool EncryptFile(string filename, bool force)
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{
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// Ensure the constants are all set
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if (_decryptArgs.IsReady != true)
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{
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Console.WriteLine("Could not read keys. Please make sure the file exists and try again.");
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return false;
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}
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try
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{
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// Open the read and write on the same file for inplace processing
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using var input = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
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using var output = File.Open(filename, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
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// Deserialize the cart information
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var cart = N3DS.Create(input);
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if (cart?.Model == null)
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{
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Console.WriteLine("Error: Not a 3DS cart image!");
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return false;
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}
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// Encrypt all 8 NCCH partitions
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EncryptAllPartitions(cart, force, input, output);
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return true;
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}
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catch
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{
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Console.WriteLine($"An error has occurred. {filename} may be corrupted if it was partially processed.");
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Console.WriteLine("Please check that the file was a valid 3DS or New 3DS cart image and try again.");
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return false;
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}
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}
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/// <inheritdoc/>
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public bool DecryptFile(string filename, bool force)
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{
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// Ensure the constants are all set
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if (_decryptArgs.IsReady != true)
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{
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Console.WriteLine("Could not read keys. Please make sure the file exists and try again.");
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return false;
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}
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try
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{
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// Open the read and write on the same file for inplace processing
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using var input = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
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using var output = File.Open(filename, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
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// Deserialize the cart information
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var cart = N3DS.Create(input);
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if (cart?.Model == null)
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{
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Console.WriteLine("Error: Not a 3DS cart image!");
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return false;
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}
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// Decrypt all 8 NCCH partitions
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DecryptAllPartitions(cart, force, input, output);
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return true;
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}
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catch
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{
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Console.WriteLine($"An error has occurred. {filename} may be corrupted if it was partially processed.");
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Console.WriteLine("Please check that the file was a valid 3DS or New 3DS cart image and try again.");
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return false;
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}
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}
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#region Decrypt
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/// <summary>
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/// Decrypt all partitions in the partition table of an NCSD header
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/// </summary>
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/// <param name="cart">Cart representing the 3DS file</param>
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/// <param name="force">Indicates if the operation should be forced</param>
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/// <param name="input">Stream representing the input</param>
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/// <param name="output">Stream representing the output</param>
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private void DecryptAllPartitions(N3DS cart, bool force, Stream input, Stream output)
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{
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// Check the partitions table
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if (cart.PartitionsTable == null || cart.Partitions == null)
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{
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Console.WriteLine("Invalid partitions table!");
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return;
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}
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// Iterate over all 8 NCCH partitions
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for (int p = 0; p < 8; p++)
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{
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var partition = cart.Partitions[p];
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if (partition == null || partition.MagicID != NCCHMagicNumber)
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{
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Console.WriteLine($"Partition {p} Not found... Skipping...");
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continue;
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}
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// Check the partition has data
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var partitionEntry = cart.PartitionsTable[p];
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if (partitionEntry == null || partitionEntry.Length == 0)
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{
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Console.WriteLine($"Partition {p} No data... Skipping...");
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continue;
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}
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// Decrypt the partition, if possible
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if (ShouldDecryptPartition(cart, p, force))
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DecryptPartition(cart, p, input, output);
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}
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}
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/// <summary>
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/// Determine if the current partition should be decrypted
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/// </summary>s
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private static bool ShouldDecryptPartition(N3DS cart, int index, bool force)
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{
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// If we're forcing the operation, tell the user
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if (force)
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{
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Console.WriteLine($"Partition {index} is not verified due to force flag being set.");
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return true;
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}
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// If we're not forcing the operation, check if the 'NoCrypto' bit is set
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else if (cart.PossiblyDecrypted(index))
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{
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Console.WriteLine($"Partition {index}: Already Decrypted?...");
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return false;
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}
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// By default, it passes
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return true;
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}
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/// <summary>
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/// Decrypt a single partition
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/// </summary>
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/// <param name="cart">Cart representing the 3DS file</param>
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/// <param name="index">Index of the partition</param>
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/// <param name="input">Stream representing the input</param>
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/// <param name="output">Stream representing the output</param>
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private void DecryptPartition(N3DS cart, int index, Stream input, Stream output)
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{
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// Determine the keys needed for this partition
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SetDecryptionKeys(cart, index);
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// Decrypt the parts of the partition
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DecryptExtendedHeader(cart, index, input, output);
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DecryptExeFS(cart, index, input, output);
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DecryptRomFS(cart, index, input, output);
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// Update the flags
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UpdateDecryptCryptoAndMasks(cart, index, output);
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}
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/// <summary>
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/// Determine the set of keys to be used for decryption
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/// </summary>
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/// <param name="cart">Cart representing the 3DS file</param>
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/// <param name="index">Index of the partition</param>
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private void SetDecryptionKeys(N3DS cart, int index)
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{
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// Get the partition
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var partition = cart.Partitions?[index];
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if (partition?.Flags == null)
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return;
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// Get partition-specific values
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byte[]? rsaSignature = partition.RSA2048Signature;
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BitMasks masks = cart.GetBitMasks(index);
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CryptoMethod method = cart.GetCryptoMethod(index);
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// Get the partition keys
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KeysMap[index] = new PartitionKeys(_decryptArgs, rsaSignature, masks, method, _development);
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}
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/// <summary>
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/// Decrypt the extended header, if it exists
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/// </summary>
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/// <param name="cart">Cart representing the 3DS file</param>
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/// <param name="index">Index of the partition</param>
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/// <param name="input">Stream representing the input</param>
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/// <param name="output">Stream representing the output</param>
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private bool DecryptExtendedHeader(N3DS cart, int index, Stream input, Stream output)
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{
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// Get required offsets
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uint partitionOffset = cart.GetPartitionOffset(index);
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if (partitionOffset == 0 || partitionOffset > input.Length)
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{
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Console.WriteLine($"Partition {index} No Data... Skipping...");
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return false;
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}
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uint extHeaderSize = cart.GetExtendedHeaderSize(index);
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if (extHeaderSize == 0)
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{
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Console.WriteLine($"Partition {index} No Extended Header... Skipping...");
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return false;
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}
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// Seek to the extended header
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input.Seek(partitionOffset + 0x200, SeekOrigin.Begin);
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output.Seek(partitionOffset + 0x200, SeekOrigin.Begin);
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Console.WriteLine($"Partition {index}: Decrypting - ExHeader");
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// Create the Plain AES cipher for this partition
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var cipher = CreateAESDecryptionCipher(KeysMap[index].NormalKey2C, cart.PlainIV(index));
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// Process the extended header
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PerformAESOperation(Constants.CXTExtendedDataHeaderLength, cipher, input, output, null);
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#if NET6_0_OR_GREATER
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// In .NET 6.0, this operation is not picked up by the reader, so we have to force it to reload its buffer
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input.Seek(0, SeekOrigin.Begin);
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#endif
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output.Flush();
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return true;
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}
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/// <summary>
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/// Decrypt the ExeFS, if it exists
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/// </summary>
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/// <param name="cart">Cart representing the 3DS file</param>
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/// <param name="index">Index of the partition</param>
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/// <param name="input">Stream representing the input</param>
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/// <param name="output">Stream representing the output</param>
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private bool DecryptExeFS(N3DS cart, int index, Stream input, Stream output)
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{
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// Validate the ExeFS
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uint exeFsHeaderOffset = cart.GetExeFSOffset(index);
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if (exeFsHeaderOffset == 0 || exeFsHeaderOffset > input.Length)
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{
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Console.WriteLine($"Partition {index} ExeFS: No Data... Skipping...");
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return false;
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}
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uint exeFsSize = cart.GetExeFSSize(index);
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if (exeFsSize == 0)
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{
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Console.WriteLine($"Partition {index} ExeFS: No Data... Skipping...");
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return false;
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}
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// Decrypt the filename table
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DecryptExeFSFilenameTable(cart, index, input, output);
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// For all but the original crypto method, process each of the files in the table
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if (cart.GetCryptoMethod(index) != CryptoMethod.Original)
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DecryptExeFSFileEntries(cart, index, input, output);
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// Get the ExeFS files offset
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uint exeFsFilesOffset = exeFsHeaderOffset + cart.MediaUnitSize;
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// Seek to the ExeFS
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input.Seek(exeFsFilesOffset, SeekOrigin.Begin);
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output.Seek(exeFsFilesOffset, SeekOrigin.Begin);
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// Create the ExeFS AES cipher for this partition
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uint ctroffsetE = cart.MediaUnitSize / 0x10;
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byte[] exefsIVWithOffset = Add(cart.ExeFSIV(index), ctroffsetE);
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var cipher = CreateAESDecryptionCipher(KeysMap[index].NormalKey2C, exefsIVWithOffset);
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// Setup and perform the decryption
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exeFsSize -= cart.MediaUnitSize;
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PerformAESOperation(exeFsSize,
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cipher,
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input,
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output,
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(string s) => Console.WriteLine($"\rPartition {index} ExeFS: Decrypting - {s}"));
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return true;
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}
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/// <summary>
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/// Decrypt the ExeFS Filename Table
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/// </summary>
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/// <param name="cart">Cart representing the 3DS file</param>
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/// <param name="index">Index of the partition</param>
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/// <param name="input">Stream representing the input</param>
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/// <param name="output">Stream representing the output</param>
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private void DecryptExeFSFilenameTable(N3DS cart, int index, Stream input, Stream output)
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{
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// Get ExeFS offset
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uint exeFsOffset = cart.GetExeFSOffset(index);
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if (exeFsOffset == 0 || exeFsOffset > input.Length)
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{
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Console.WriteLine($"Partition {index} ExeFS: No Data... Skipping...");
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return;
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}
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// Seek to the ExeFS header
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input.Seek(exeFsOffset, SeekOrigin.Begin);
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output.Seek(exeFsOffset, SeekOrigin.Begin);
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Console.WriteLine($"Partition {index} ExeFS: Decrypting - ExeFS Filename Table");
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// Create the ExeFS AES cipher for this partition
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var cipher = CreateAESDecryptionCipher(KeysMap[index].NormalKey2C, cart.ExeFSIV(index));
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// Process the filename table
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byte[] readBytes = input.ReadBytes((int)cart.MediaUnitSize);
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byte[] processedBytes = cipher.ProcessBytes(readBytes);
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output.Write(processedBytes);
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#if NET6_0_OR_GREATER
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// In .NET 6.0, this operation is not picked up by the reader, so we have to force it to reload its buffer
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input.Seek(0, SeekOrigin.Begin);
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#endif
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output.Flush();
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}
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/// <summary>
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/// Decrypt the ExeFS file entries
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/// </summary>
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/// <param name="cart">Cart representing the 3DS file</param>
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/// <param name="index">Index of the partition</param>
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/// <param name="input">Stream representing the input</param>
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/// <param name="output">Stream representing the output</param>
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private void DecryptExeFSFileEntries(N3DS cart, int index, Stream input, Stream output)
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{
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if (cart.ExeFSHeaders == null || index < 0 || index > cart.ExeFSHeaders.Length)
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{
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Console.WriteLine($"Partition {index} ExeFS: No Data... Skipping...");
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return;
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}
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// Get the ExeFS header
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var exeFsHeader = cart.ExeFSHeaders[index];
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if (exeFsHeader?.FileHeaders == null)
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{
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Console.WriteLine($"Partition {index} ExeFS header does not exist. Skipping...");
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return;
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}
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// Get the ExeFS offset
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uint exeFsHeaderOffset = cart.GetExeFSOffset(index);
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uint exeFsFilesOffset = exeFsHeaderOffset + cart.MediaUnitSize;
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// Loop through and process all headers
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for (int i = 0; i < exeFsHeader.FileHeaders.Length; i++)
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{
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// Only attempt to process code binary files
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if (!cart.IsCodeBinary(index, i))
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continue;
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// Get the file header
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var fileHeader = exeFsHeader.FileHeaders[i];
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if (fileHeader == null)
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continue;
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// Create the ExeFS AES ciphers for this partition
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uint ctroffset = (fileHeader.FileOffset + cart.MediaUnitSize) / 0x10;
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byte[] exefsIVWithOffsetForHeader = Add(cart.ExeFSIV(index), ctroffset);
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var firstCipher = CreateAESDecryptionCipher(KeysMap[index].NormalKey, exefsIVWithOffsetForHeader);
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var secondCipher = CreateAESEncryptionCipher(KeysMap[index].NormalKey2C, exefsIVWithOffsetForHeader);
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// Seek to the file entry
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input.Seek(exeFsFilesOffset + fileHeader.FileOffset, SeekOrigin.Begin);
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output.Seek(exeFsFilesOffset + fileHeader.FileOffset, SeekOrigin.Begin);
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// Setup and perform the encryption
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PerformAESOperation(fileHeader.FileSize,
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firstCipher,
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secondCipher,
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input,
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output,
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(string s) => Console.WriteLine($"\rPartition {index} ExeFS: Decrypting - {fileHeader.FileName}...{s}"));
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}
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}
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/// <summary>
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/// Decrypt the RomFS, if it exists
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/// </summary>
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/// <param name="cart">Cart representing the 3DS file</param>
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/// <param name="index">Index of the partition</param>
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/// <param name="input">Stream representing the input</param>
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/// <param name="output">Stream representing the output</param>
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private bool DecryptRomFS(N3DS cart, int index, Stream input, Stream output)
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{
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// Validate the RomFS
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uint romFsOffset = cart.GetRomFSOffset(index);
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if (romFsOffset == 0 || romFsOffset > input.Length)
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{
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Console.WriteLine($"Partition {index} RomFS: No Data... Skipping...");
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return false;
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}
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uint romFsSize = cart.GetRomFSSize(index);
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if (romFsSize == 0)
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{
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Console.WriteLine($"Partition {index} RomFS: No Data... Skipping...");
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return false;
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}
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// Seek to the RomFS
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input.Seek(romFsOffset, SeekOrigin.Begin);
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output.Seek(romFsOffset, SeekOrigin.Begin);
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// Create the RomFS AES cipher for this partition
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var cipher = CreateAESDecryptionCipher(KeysMap[index].NormalKey, cart.RomFSIV(index));
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// Setup and perform the decryption
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PerformAESOperation(romFsSize,
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cipher,
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input,
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output,
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(string s) => Console.WriteLine($"\rPartition {index} RomFS: Decrypting - {s}"));
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return true;
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}
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/// <summary>
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/// Update the CryptoMethod and BitMasks for the decrypted partition
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/// </summary>
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/// <param name="cart">Cart representing the 3DS file</param>
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/// <param name="index">Index of the partition</param>
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/// <param name="output">Stream representing the output</param>
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private static void UpdateDecryptCryptoAndMasks(N3DS cart, int index, Stream output)
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{
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// Get required offsets
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uint partitionOffset = cart.GetPartitionOffset(index);
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// Seek to the CryptoMethod location
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output.Seek(partitionOffset + 0x18B, SeekOrigin.Begin);
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// Write the new CryptoMethod
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output.Write((byte)CryptoMethod.Original);
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output.Flush();
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// Seek to the BitMasks location
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output.Seek(partitionOffset + 0x18F, SeekOrigin.Begin);
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// Write the new BitMasks flag
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BitMasks flag = cart.GetBitMasks(index);
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flag &= (BitMasks)((byte)(BitMasks.FixedCryptoKey | BitMasks.NewKeyYGenerator) ^ 0xFF);
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flag |= BitMasks.NoCrypto;
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output.Write((byte)flag);
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output.Flush();
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}
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#endregion
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#region Encrypt
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/// <summary>
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/// Encrypt all partitions in the partition table of an NCSD header
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/// </summary>
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/// <param name="cart">Cart representing the 3DS file</param>
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/// <param name="force">Indicates if the operation should be forced</param>
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/// <param name="input">Stream representing the input</param>
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/// <param name="output">Stream representing the output</param>
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private void EncryptAllPartitions(N3DS cart, bool force, Stream input, Stream output)
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{
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// Check the partitions table
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if (cart.PartitionsTable == null || cart.Partitions == null)
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{
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Console.WriteLine("Invalid partitions table!");
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return;
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}
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// Iterate over all 8 NCCH partitions
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for (int p = 0; p < 8; p++)
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{
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// Check the partition exists
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var partition = cart.Partitions[p];
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if (partition == null || partition.MagicID != NCCHMagicNumber)
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{
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Console.WriteLine($"Partition {p} Not found... Skipping...");
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continue;
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}
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// Check the partition has data
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var partitionEntry = cart.PartitionsTable[p];
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if (partitionEntry == null || partitionEntry.Length == 0)
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{
|
|
Console.WriteLine($"Partition {p} No data... Skipping...");
|
|
continue;
|
|
}
|
|
|
|
// Encrypt the partition, if possible
|
|
if (ShouldEncryptPartition(cart, p, force))
|
|
EncryptPartition(cart, p, input, output);
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Determine if the current partition should be encrypted
|
|
/// </summary>
|
|
private static bool ShouldEncryptPartition(N3DS cart, int index, bool force)
|
|
{
|
|
// If we're forcing the operation, tell the user
|
|
if (force)
|
|
{
|
|
Console.WriteLine($"Partition {index} is not verified due to force flag being set.");
|
|
return true;
|
|
}
|
|
// If we're not forcing the operation, check if the 'NoCrypto' bit is set
|
|
else if (!cart.PossiblyDecrypted(index))
|
|
{
|
|
Console.WriteLine($"Partition {index}: Already Encrypted?...");
|
|
return false;
|
|
}
|
|
|
|
// By default, it passes
|
|
return true;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Encrypt a single partition
|
|
/// </summary>
|
|
/// <param name="cart">Cart representing the 3DS file</param>
|
|
/// <param name="index">Index of the partition</param>
|
|
/// <param name="input">Stream representing the input</param>
|
|
/// <param name="output">Stream representing the output</param>
|
|
private void EncryptPartition(N3DS cart, int index, Stream input, Stream output)
|
|
{
|
|
// Determine the keys needed for this partition
|
|
SetEncryptionKeys(cart, index);
|
|
|
|
// Encrypt the parts of the partition
|
|
EncryptExtendedHeader(cart, index, input, output);
|
|
EncryptExeFS(cart, index, input, output);
|
|
EncryptRomFS(cart, index, input, output);
|
|
|
|
// Update the flags
|
|
UpdateEncryptCryptoAndMasks(cart, index, output);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Determine the set of keys to be used for encryption
|
|
/// </summary>
|
|
/// <param name="cart">Cart representing the 3DS file</param>
|
|
/// <param name="index">Index of the partition</param>
|
|
private void SetEncryptionKeys(N3DS cart, int index)
|
|
{
|
|
// Get the partition
|
|
var partition = cart.Partitions?[index];
|
|
if (partition == null)
|
|
return;
|
|
|
|
// Get the backup header
|
|
var backupHeader = cart.BackupHeader;
|
|
if (backupHeader?.Flags == null)
|
|
return;
|
|
|
|
// Get partition-specific values
|
|
byte[]? rsaSignature = partition.RSA2048Signature;
|
|
BitMasks masks = backupHeader.Flags.BitMasks;
|
|
CryptoMethod method = backupHeader.Flags.CryptoMethod;
|
|
|
|
// Get the partition keys
|
|
KeysMap[index] = new PartitionKeys(_decryptArgs, rsaSignature, masks, method, _development);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Encrypt the extended header, if it exists
|
|
/// </summary>
|
|
/// <param name="cart">Cart representing the 3DS file</param>
|
|
/// <param name="index">Index of the partition</param>
|
|
/// <param name="input">Stream representing the input</param>
|
|
/// <param name="output">Stream representing the output</param>
|
|
private bool EncryptExtendedHeader(N3DS cart, int index, Stream input, Stream output)
|
|
{
|
|
// Get required offsets
|
|
uint partitionOffset = cart.GetPartitionOffset(index);
|
|
if (partitionOffset == 0 || partitionOffset > input.Length)
|
|
{
|
|
Console.WriteLine($"Partition {index} No Data... Skipping...");
|
|
return false;
|
|
}
|
|
|
|
uint extHeaderSize = cart.GetExtendedHeaderSize(index);
|
|
if (extHeaderSize == 0)
|
|
{
|
|
Console.WriteLine($"Partition {index} No Extended Header... Skipping...");
|
|
return false;
|
|
}
|
|
|
|
// Seek to the extended header
|
|
input.Seek(partitionOffset + 0x200, SeekOrigin.Begin);
|
|
output.Seek(partitionOffset + 0x200, SeekOrigin.Begin);
|
|
|
|
Console.WriteLine($"Partition {index}: Encrypting - ExHeader");
|
|
|
|
// Create the Plain AES cipher for this partition
|
|
var cipher = CreateAESEncryptionCipher(KeysMap[index].NormalKey2C, cart.PlainIV(index));
|
|
|
|
// Process the extended header
|
|
PerformAESOperation(Constants.CXTExtendedDataHeaderLength, cipher, input, output, null);
|
|
|
|
#if NET6_0_OR_GREATER
|
|
// In .NET 6.0, this operation is not picked up by the reader, so we have to force it to reload its buffer
|
|
input.Seek(0, SeekOrigin.Begin);
|
|
#endif
|
|
output.Flush();
|
|
return true;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Encrypt the ExeFS, if it exists
|
|
/// </summary>
|
|
/// <param name="cart">Cart representing the 3DS file</param>
|
|
/// <param name="index">Index of the partition</param>
|
|
/// <param name="input">Stream representing the input</param>
|
|
/// <param name="output">Stream representing the output</param>
|
|
private bool EncryptExeFS(N3DS cart, int index, Stream input, Stream output)
|
|
{
|
|
if (cart.ExeFSHeaders == null || index < 0 || index > cart.ExeFSHeaders.Length)
|
|
{
|
|
Console.WriteLine($"Partition {index} ExeFS: No Data... Skipping...");
|
|
return false;
|
|
}
|
|
|
|
// Get the ExeFS header
|
|
var exefsHeader = cart.ExeFSHeaders[index];
|
|
if (exefsHeader == null)
|
|
{
|
|
Console.WriteLine($"Partition {index} ExeFS header does not exist. Skipping...");
|
|
return false;
|
|
}
|
|
|
|
// For all but the original crypto method, process each of the files in the table
|
|
var backupHeader = cart.BackupHeader;
|
|
if (backupHeader!.Flags!.CryptoMethod != CryptoMethod.Original)
|
|
EncryptExeFSFileEntries(cart, index, input, output);
|
|
|
|
// Encrypt the filename table
|
|
EncryptExeFSFilenameTable(cart, index, input, output);
|
|
|
|
// Get the ExeFS files offset
|
|
uint exeFsHeaderOffset = cart.GetExeFSOffset(index);
|
|
uint exeFsFilesOffset = exeFsHeaderOffset + cart.MediaUnitSize;
|
|
|
|
// Seek to the ExeFS
|
|
input.Seek(exeFsFilesOffset, SeekOrigin.Begin);
|
|
output.Seek(exeFsFilesOffset, SeekOrigin.Begin);
|
|
|
|
// Create the ExeFS AES cipher for this partition
|
|
uint ctroffsetE = cart.MediaUnitSize / 0x10;
|
|
byte[] exefsIVWithOffset = Add(cart.ExeFSIV(index), ctroffsetE);
|
|
var cipher = CreateAESEncryptionCipher(KeysMap[index].NormalKey2C, exefsIVWithOffset);
|
|
|
|
// Setup and perform the encryption
|
|
uint exeFsSize = cart.GetExeFSSize(index) - cart.MediaUnitSize;
|
|
PerformAESOperation(exeFsSize,
|
|
cipher,
|
|
input,
|
|
output,
|
|
(string s) => Console.WriteLine($"\rPartition {index} ExeFS: Encrypting - {s}"));
|
|
|
|
return true;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Encrypt the ExeFS Filename Table
|
|
/// </summary>
|
|
/// <param name="cart">Cart representing the 3DS file</param>
|
|
/// <param name="index">Index of the partition</param>
|
|
/// <param name="input">Stream representing the input</param>
|
|
/// <param name="output">Stream representing the output</param>
|
|
private void EncryptExeFSFilenameTable(N3DS cart, int index, Stream input, Stream output)
|
|
{
|
|
// Get ExeFS offset
|
|
uint exeFsOffset = cart.GetExeFSOffset(index);
|
|
if (exeFsOffset == 0 || exeFsOffset > input.Length)
|
|
{
|
|
Console.WriteLine($"Partition {index} ExeFS: No Data... Skipping...");
|
|
return;
|
|
}
|
|
|
|
// Seek to the ExeFS header
|
|
input.Seek(exeFsOffset, SeekOrigin.Begin);
|
|
output.Seek(exeFsOffset, SeekOrigin.Begin);
|
|
|
|
Console.WriteLine($"Partition {index} ExeFS: Encrypting - ExeFS Filename Table");
|
|
|
|
// Create the ExeFS AES cipher for this partition
|
|
var cipher = CreateAESEncryptionCipher(KeysMap[index].NormalKey2C, cart.ExeFSIV(index));
|
|
|
|
// Process the filename table
|
|
byte[] readBytes = input.ReadBytes((int)cart.MediaUnitSize);
|
|
byte[] processedBytes = cipher.ProcessBytes(readBytes);
|
|
output.Write(processedBytes);
|
|
|
|
#if NET6_0_OR_GREATER
|
|
// In .NET 6.0, this operation is not picked up by the reader, so we have to force it to reload its buffer
|
|
input.Seek(0, SeekOrigin.Begin);
|
|
#endif
|
|
output.Flush();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Encrypt the ExeFS file entries
|
|
/// </summary>
|
|
/// <param name="cart">Cart representing the 3DS file</param>
|
|
/// <param name="index">Index of the partition</param>
|
|
/// <param name="input">Stream representing the input</param>
|
|
/// <param name="output">Stream representing the output</param>
|
|
private void EncryptExeFSFileEntries(N3DS cart, int index, Stream input, Stream output)
|
|
{
|
|
// Get ExeFS offset
|
|
uint exeFsHeaderOffset = cart.GetExeFSOffset(index);
|
|
if (exeFsHeaderOffset == 0 || exeFsHeaderOffset > input.Length)
|
|
{
|
|
Console.WriteLine($"Partition {index} ExeFS: No Data... Skipping...");
|
|
return;
|
|
}
|
|
|
|
// Get to the start of the files
|
|
uint exeFsFilesOffset = exeFsHeaderOffset + cart.MediaUnitSize;
|
|
|
|
// If the header failed to read, log and return
|
|
var exeFsHeader = cart.ExeFSHeaders?[index];
|
|
if (exeFsHeader?.FileHeaders == null)
|
|
{
|
|
Console.WriteLine($"Partition {index} ExeFS header does not exist. Skipping...");
|
|
return;
|
|
}
|
|
|
|
// Loop through and process all headers
|
|
for (int i = 0; i < exeFsHeader.FileHeaders.Length; i++)
|
|
{
|
|
// Only attempt to process code binary files
|
|
if (!cart.IsCodeBinary(index, i))
|
|
continue;
|
|
|
|
// Get the file header
|
|
var fileHeader = exeFsHeader.FileHeaders[i];
|
|
if (fileHeader == null)
|
|
continue;
|
|
|
|
// Create the ExeFS AES ciphers for this partition
|
|
uint ctroffset = (fileHeader.FileOffset + cart.MediaUnitSize) / 0x10;
|
|
byte[] exefsIVWithOffsetForHeader = Add(cart.ExeFSIV(index), ctroffset);
|
|
var firstCipher = CreateAESEncryptionCipher(KeysMap[index].NormalKey, exefsIVWithOffsetForHeader);
|
|
var secondCipher = CreateAESDecryptionCipher(KeysMap[index].NormalKey2C, exefsIVWithOffsetForHeader);
|
|
|
|
// Seek to the file entry
|
|
input.Seek(exeFsFilesOffset + fileHeader.FileOffset, SeekOrigin.Begin);
|
|
output.Seek(exeFsFilesOffset + fileHeader.FileOffset, SeekOrigin.Begin);
|
|
|
|
// Setup and perform the encryption
|
|
PerformAESOperation(fileHeader.FileSize,
|
|
firstCipher,
|
|
secondCipher,
|
|
input,
|
|
output,
|
|
(string s) => Console.WriteLine($"\rPartition {index} ExeFS: Encrypting - {fileHeader.FileName}...{s}"));
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Encrypt the RomFS, if it exists
|
|
/// </summary>
|
|
/// <param name="cart">Cart representing the 3DS file</param>
|
|
/// <param name="index">Index of the partition</param>
|
|
/// <param name="input">Stream representing the input</param>
|
|
/// <param name="output">Stream representing the output</param>
|
|
private bool EncryptRomFS(N3DS cart, int index, Stream input, Stream output)
|
|
{
|
|
// Validate the RomFS
|
|
uint romFsOffset = cart.GetRomFSOffset(index);
|
|
if (romFsOffset == 0 || romFsOffset > input.Length)
|
|
{
|
|
Console.WriteLine($"Partition {index} RomFS: No Data... Skipping...");
|
|
return false;
|
|
}
|
|
|
|
uint romFsSize = cart.GetRomFSSize(index);
|
|
if (romFsSize == 0)
|
|
{
|
|
Console.WriteLine($"Partition {index} RomFS: No Data... Skipping...");
|
|
return false;
|
|
}
|
|
|
|
// Seek to the RomFS
|
|
input.Seek(romFsOffset, SeekOrigin.Begin);
|
|
output.Seek(romFsOffset, SeekOrigin.Begin);
|
|
|
|
// Force setting encryption keys for partitions 1 and above
|
|
if (index > 0)
|
|
{
|
|
var backupHeader = cart.BackupHeader;
|
|
KeysMap[index].SetRomFSValues(backupHeader!.Flags!.BitMasks);
|
|
}
|
|
|
|
// Create the RomFS AES cipher for this partition
|
|
var cipher = CreateAESEncryptionCipher(KeysMap[index].NormalKey, cart.RomFSIV(index));
|
|
|
|
// Setup and perform the decryption
|
|
PerformAESOperation(romFsSize,
|
|
cipher,
|
|
input,
|
|
output,
|
|
(string s) => Console.WriteLine($"\rPartition {index} RomFS: Encrypting - {s}"));
|
|
|
|
return true;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Update the CryptoMethod and BitMasks for the encrypted partition
|
|
/// </summary>
|
|
/// <param name="cart">Cart representing the 3DS file</param>
|
|
/// <param name="index">Index of the partition</param>
|
|
/// <param name="output">Stream representing the output</param>
|
|
private static void UpdateEncryptCryptoAndMasks(N3DS cart, int index, Stream output)
|
|
{
|
|
// Get required offsets
|
|
uint partitionOffset = cart.GetPartitionOffset(index);
|
|
|
|
// Get the backup header
|
|
var backupHeader = cart.BackupHeader;
|
|
if (backupHeader?.Flags == null)
|
|
return;
|
|
|
|
// Seek to the CryptoMethod location
|
|
output.Seek(partitionOffset + 0x18B, SeekOrigin.Begin);
|
|
|
|
// Write the new CryptoMethod
|
|
// - For partitions 1 and up, set crypto-method to 0x00
|
|
// - If partition 0, restore crypto-method from backup flags
|
|
byte cryptoMethod = index > 0 ? (byte)CryptoMethod.Original : (byte)backupHeader.Flags.CryptoMethod;
|
|
output.Write(cryptoMethod);
|
|
output.Flush();
|
|
|
|
// Seek to the BitMasks location
|
|
output.Seek(partitionOffset + 0x18F, SeekOrigin.Begin);
|
|
|
|
// Write the new BitMasks flag
|
|
BitMasks flag = cart.GetBitMasks(index);
|
|
flag &= (BitMasks.FixedCryptoKey | BitMasks.NewKeyYGenerator | BitMasks.NoCrypto) ^ (BitMasks)0xFF;
|
|
flag |= (BitMasks.FixedCryptoKey | BitMasks.NewKeyYGenerator) & backupHeader.Flags.BitMasks;
|
|
output.Write((byte)flag);
|
|
output.Flush();
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
}
|