public NcaBodySection(long mediaOffset, long mediaLength, NcaSectionCrypto sectionCrypto, byte[] baseSectionCtr)
{
if (mediaOffset < 6)
{
throw new ArgumentOutOfRangeException(nameof(mediaOffset));
}
if (mediaLength <= 0)
{
throw new ArgumentOutOfRangeException(nameof(mediaLength));
}
if (baseSectionCtr == null)
{
throw new ArgumentNullException(nameof(baseSectionCtr));
}
if (baseSectionCtr.Length != 0x10)
{
throw new InvalidOperationException("Base section ctr needs a length of 0x10 bytes.");
}
MediaOffset = mediaOffset;
MediaLength = mediaLength;
SectionCrypto = sectionCrypto;
BaseSectionCtr = new byte[0x10];
Array.Copy(baseSectionCtr, BaseSectionCtr, 0x10);
}
public NcaBodyStream(Stream input, NcaSectionCrypto sectionCryptoType, byte[] iv, byte[] decKeyArea, byte[] decTitleKey)
{
if (sectionCryptoType == NcaSectionCrypto.TitleKey)
{
if (decTitleKey == null)
{
throw new ArgumentNullException(nameof(decTitleKey));
}
_baseStream = new CtrStream(input, decTitleKey, iv, false);
}
else
{
switch (sectionCryptoType)
{
case NcaSectionCrypto.NoCrypto:
_baseStream = input;
break;
case NcaSectionCrypto.Xts:
var keyAreaKey = new byte[0x20];
Array.Copy(decKeyArea, keyAreaKey, 0x20);
_baseStream = new XtsStream(input, keyAreaKey, iv, true, false, 0x200);
break;
case NcaSectionCrypto.Ctr:
keyAreaKey = new byte[0x10];
Array.Copy(decKeyArea, 0x20, keyAreaKey, 0, 0x10);
_baseStream = new CtrStream(input, keyAreaKey, iv, false);
break;
case NcaSectionCrypto.Bktr:
//BKTR, some CTR
//stub
// TODO: Implement BKTR cryptography
throw new NotSupportedException($"This section crypto is not supported.");
}
}
}
