public bool Sign(byte[] XboxHDKey, bool skipContentHashing, out string errorMessage)
{
if (Equals(null, XboxHDKey) || XboxHDKey.Length != 0x10)
{
errorMessage = "Bad key";
return(false);
}
byte[] buffer, hash;
//calculate content hashes
if (!skipContentHashing)
{
object result;
if (!GetSection(Types.SectionType.TableOfContents, out result))
{
errorMessage = "Failed to parse section data";
return(false);
}
Types.Section section = Sections[1];
Types.TableOfContents fileTable = (Types.TableOfContents)result; //parsed toc data
foreach (Types.TableEntry file in fileTable.entries)
{
if (!file.Exists(Path.GetDirectoryName(FilePath)))
{
errorMessage = string.Format("Content file not found: {0}", file.fileName);
return(false);
}
uint hashStartOffset = file.fileHashOffset;
uint hashLength = file.fileHashLength;
uint size = (uint)new FileInfo(Path.Combine(Path.GetDirectoryName(FilePath), file.fileName)).Length;
if (size != file.fileSize)
{
//errorMessage = string.Format("The size of the file \"{0}\" is invalid\n\nExpected size: {1} ({2} bytes)\nActual size: {3} ({4} bytes)", file.fileName, file.fileSize.RoundBytes(), file.fileSize, size.RoundBytes(), size);
//return false;
//instead of returning an error here I decided to correct the file size, in case of modders :)
buffer = BitConverter.GetBytes(size);
IO.Position = (((section.sectionOffset + fileTable.entryTableOffset) + file.entryOffset) + 0x8);
IO.Write(buffer, 0, 4); //file size
//set hash to cover entire file
IO.Write(new byte[4], 0, 4); //hash start offset
IO.Write(buffer, 0, 4); //hash length
hashStartOffset = 0;
hashLength = size;
}
buffer = File.ReadAllBytes(Path.Combine(Path.GetDirectoryName(FilePath), file.fileName));
hash = XCalcSig.CalculateDigest(buffer, (int)hashStartOffset, (int)hashLength);
IO.Position = ((section.sectionOffset + 0xC) + (file.fileHashIndex * 0x14));
IO.Write(hash, 0, 0x14);
}
IO.Flush();
}
//calculate section hashes
foreach (Types.Section section in Sections)
{
if (!section.IsAllocated)
{
continue;
}
buffer = new byte[section.sectionLength];
IO.Position = section.sectionOffset;
IO.Read(buffer, 0, (int)section.sectionLength);
hash = XCalcSig.CalculateDigest(buffer);
IO.Position = section.hashOffset;
IO.Write(hash, 0, 0x14);
}
IO.Flush();
//calculate header "signature"
buffer = new byte[(Header.headerSize - 0x14)];
IO.Position = 0x14;
IO.Read(buffer, 0, (int)(Header.headerSize - 0x14));
hash = XCalcSig.CalculateNonRoamable(BitConverter.GetBytes(Header.titleId), XboxHDKey, buffer);
IO.Position = 0;
IO.Write(hash, 0, 0x14);
IO.Flush();
buffer = null;
hash = null;
errorMessage = null;
return(true);
}
bool Read()
{
Types.Header header = new Types.Header();
byte[] buffer = new byte[4];
IO.Position = 0;
header.headerHash = new byte[0x14];
IO.Read(header.headerHash, 0, 0x14);
IO.Read(buffer, 0, 4);
header.magic = buffer.ToUInt32(false);
IO.Read(buffer, 0, 4);
header.headerSize = buffer.ToUInt32(false);
header.headerType = (Types.HeaderType)header.headerSize;
IO.Read(buffer, 0, 4);
header.contentType = buffer.ToUInt32(false);
IO.Read(buffer, 0, 4);
header.contentFlags = buffer.ToUInt32(false);
IO.Read(buffer, 0, 4);
header.titleId = buffer.ToUInt32(false);
IO.Read(buffer, 0, 4);
header.offerId = buffer.ToUInt32(false);
IO.Read(buffer, 0, 4);
header.offerTitleId = buffer.ToUInt32(false);
IO.Read(buffer, 0, 4);
header.publisherFlags = buffer.ToUInt32(false);
Header = header;
uint sectionCount = ((header.headerSize - 0x34) / 0x1C);
if (sectionCount < 2)
{
buffer = null;
IO.Dispose();
IO = null;
return(false);
}
Sections = new Types.Section[sectionCount];
for (int i = 0; i < sectionCount; i++)
{
Types.Section section = new Types.Section();
IO.Read(buffer, 0, 4);
section.sectionOffset = buffer.ToUInt32(false);
IO.Read(buffer, 0, 4);
section.sectionLength = buffer.ToUInt32(false);
section.hashOffset = (uint)IO.Position; //for convenience when signing
section.sectionHash = new byte[0x14];
IO.Read(section.sectionHash, 0, 0x14);
Sections[i] = section;
}
for (int i = 0; i < sectionCount; i++)
{
IO.Position = Sections[i].sectionOffset;
Sections[i].sectionData = new byte[Sections[i].sectionLength];
IO.Read(Sections[i].sectionData, 0, (int)Sections[i].sectionLength);
}
buffer = null;
//section types always in the same order depending on header size
if (header.headerType == Types.HeaderType.Content) //0x88 = content
{
Sections[0].sectionType = Types.SectionType.Language;
Sections[1].sectionType = Types.SectionType.TableOfContents;
Sections[2].sectionType = Types.SectionType.Optional;
}
if (header.headerType == Types.HeaderType.Update) //0x6C = update
{
Sections[0].sectionType = Types.SectionType.Unknown;
Sections[1].sectionType = Types.SectionType.TableOfContents;
}
return(true);
}