/// <summary>
/// Sets the key storage
/// </summary>
/// <param name="keyFile">File containing all keys for cipher operations</param>
public void SetKeyFile(string keyFile)
{
_keyStorage = new NcaKeyStorage(keyFile);
}
public NcaStream(Stream input, NcaVersion version, NcaBodySection[] sections, NcaKeyStorage keyStorage, byte[] decKeyArea, byte[] decTitleKey)
{
_baseStream = input;
_headerStream = new NcaHeaderStream(input, version, keyStorage.HeaderKey);
_sections = sections.ToList();
_sectionStreams = new Stream[sections.Length];
for (int i = 0; i < sections.Length; i++)
{
// In the writable stream, all cipher streams encapsulate the whole stream instead of sub streaming them
var sectionIv = new byte[0x10];
if (sections[i].SectionCrypto == NcaSectionCrypto.TitleKey || sections[i].SectionCrypto == NcaSectionCrypto.Ctr)
{
// In case of Ctr we just set the base ctr, since with setting the stream position the counter will get updated correctly already
Array.Copy(sections[i].BaseSectionCtr, sectionIv, 0x10);
}
else
{
/* sections encrypted with XTS start with sector id 0 at their respective section offset
* since the cipher stream will still start at offset 0, the sector id gets decremented to a point that it will be 0, reaching its section offset
* this code can be removed if XTS sections don't start at 0 but with a value representing their section offset
*/
sectionIv.Decrement(sections[i].MediaOffset, false);
}
_sectionStreams[i] = new NcaBodyStream(input, sections[i].SectionCrypto, sectionIv, decKeyArea, decTitleKey);
}
}
