public void Decrypt(DirectoryInfo outputDirectory, bool fullyDecryptNcchContents)
{
foreach (ContentChunkRecord ccr in this.TMD.ContentChunkRecords)
{
if (!File.Exists($"{this.ContentDir.FullName}/{ccr.ID.ToString("x8")}"))
{
continue;
}
using (FileStream inputFs = File.OpenRead($"{this.ContentDir.FullName}/{ccr.ID.ToString("x8")}"))
{
using (Aes aes = Aes.Create())
{
aes.Key = this.Cryptor.NormalKey[(int)Keyslot.DecryptedTitleKey];
byte[] cindex = BitConverter.GetBytes(ccr.ContentIndex);
aes.IV = (BitConverter.IsLittleEndian ? cindex.FReverse() : cindex).PadRight(0x00, 0x10);
aes.Padding = PaddingMode.Zeros;
aes.Mode = CipherMode.CBC;
using (CryptoStream cs = new CryptoStream(File.Create($"{outputDirectory.FullName}/{ccr.ID.ToString("x8")}"), aes.CreateDecryptor(), CryptoStreamMode.Write))
{
inputFs.CopyTo(cs);
cs.FlushFinalBlock();
}
}
}
if (fullyDecryptNcchContents)
{
FileStream decryptedLayer1Fs = File.Open($"{outputDirectory.FullName}/{ccr.ID.ToString("x8")}", FileMode.Open, FileAccess.ReadWrite);
using (NCCH ncch = new NCCH(decryptedLayer1Fs, this.Cryptor, this.SeedDb))
{
using (FileStream decryptedLayer2Fs = File.Create($"{outputDirectory.FullName}/{ccr.ID.ToString("x8")}_decrypted.{(ncch.Info.Flags.IsExecutable ? "cxi" : "cfa")}"))
{
ncch.Decrypt(decryptedLayer2Fs);
}
}
}
}
File.Copy($"{this.ContentDir.FullName}/tmd", $"{outputDirectory.FullName}/tmd");
}
public void Decrypt(FileStream outputStream, bool trim = true)
{
if (this.Cryptor == null || this.SeedDatabase == null)
{
throw new ArgumentException("Cannot decrypt without seed database or crypto engine.");
}
long size;
if (!trim)
{
outputStream.SetLength(this.Info.ImageSize);
}
else
{
size = this.Info.Partitions[0].Offset;
foreach (NCSDPartition partition in this.Info.Partitions)
{
size += partition.Size;
}
outputStream.SetLength(size);
}
outputStream.Seek(0, SeekOrigin.Begin);
MemoryMappedFile outputFile = Tools.LoadFileMapped(outputStream);
using (MemoryMappedViewStream srcHeaderViewStream = this.NCSDMemoryMappedFile.CreateViewStream(0x0, this.Info.Partitions[0].Offset))
{
using (MemoryMappedViewStream destHeaderViewStream = outputFile.CreateViewStream(0x0, this.Info.Partitions[0].Offset))
{
srcHeaderViewStream.CopyTo(destHeaderViewStream);
}
}
foreach (NCSDPartition partition in this.Info.Partitions)
{
using (MemoryMappedViewStream destPartitionViewStream = outputFile.CreateViewStream(partition.Offset, partition.Size))
{
NCCH ncch = new NCCH(this.NCSDMemoryMappedFile, partition.Offset, this.Cryptor, this.SeedDatabase);
ncch.Decrypt(outputFile);
}
}
if (!trim)
{
NCSDPartition lastPartition = this.Info.Partitions.Last();
long lastPosition = lastPartition.Offset + lastPartition.Size;
using (MemoryMappedViewStream viewStream = outputFile.CreateViewStream(lastPosition, this.Info.ImageSize - lastPosition))
{
while (viewStream.Position / 64 < viewStream.Length / 64)
{
byte[] buffer = new byte[64];
for (int i = 0; i < buffer.Length; i++)
{
buffer[i] = 0xFF;
}
viewStream.Write(buffer, 0, buffer.Length);
}
}
}
}