public void ExtractContent(Stream outputStream, ContentChunkRecord contentRecord)
{
if (!this.Cryptor.NormalKey.ContainsKey(0x40))
{
this.Cryptor.LoadTitleKeyFromTicket(this.Info.Ticket);
}
if (!this.Info.ActiveContents.Contains(contentRecord))
{
throw new ArgumentException($"The specified CIA does not contain content {contentRecord.GetContentName()}");
}
long offset = this.Info.Regions[CIASection.Contents].Offset;
for (int i = 0; i < this.Info.ActiveContents.Count; i++)
{
if (this.Info.ActiveContents[i] == contentRecord)
{
break;
}
offset += this.Info.ActiveContents[i].Size;
}
if (contentRecord.Flags.Encrypted)
{
if (this.Cryptor == null)
{
throw new ArgumentException($"Current content ({contentRecord.GetContentName()}) is encrypted, and no Crypto Engine was passed to the method.");
}
using (Aes aes = Aes.Create())
{
aes.Key = this.Cryptor.NormalKey[(int)Keyslot.DecryptedTitleKey];
byte[] cindex = BitConverter.GetBytes(contentRecord.ContentIndex);
aes.IV = (BitConverter.IsLittleEndian ? cindex.FReverse() : cindex).PadRight(0x00, 0x10);
aes.Padding = PaddingMode.Zeros;
aes.Mode = CipherMode.CBC;
Tools.CryptFileStreamPart(this.CIAMemoryMappedFile, outputStream, aes.CreateDecryptor(), offset, contentRecord.Size);
}
}
else
{
using (outputStream)
{
Tools.ExtractFileStreamPart(this.CIAMemoryMappedFile, outputStream, offset, contentRecord.Size);
}
}
}
public void ExtractAllContents(DirectoryInfo outputDirectory)
{
if (this.Info.ActiveContents.Any(ac => ac.Flags.Encrypted) && this.Cryptor == null)
{
throw new FileNotFoundException("Some contents in the CIA are encrypted, but no crypto engine to decrypt them has been passed to the method.");
}
for (int i = 0; i < this.Info.ActiveContents.Count; i++)
{
ContentChunkRecord currentRecord = this.Info.ActiveContents[i];
ExtractContent(File.Create($"{outputDirectory.FullName}/{currentRecord.GetContentName()}.ncch"), currentRecord);
}
}
