public void parseDRM(byte[] byteData, int drmCount, List <byte[]> pidList)
{
byte[] keyVec1 = new byte[] { 0x72, 0x38, 0x33, (byte)0xB0, (byte)0xB4, (byte)0xF2, (byte)0xE3, (byte)0xCA, (byte)0xDF, 0x09, 0x01, (byte)0xD6, (byte)0xE2, (byte)0xE0, 0x3F, (byte)0x96 };
foreach (byte[] pid in pidList)
{
byte[] bigpid = new byte[16];
for (int i = 0; i < 16; i++)
{
bigpid[i] = 0x00;
}
for (int i = 0; i < pid.Count(); i++)
{
bigpid[i] = pid[i];
}
byte[] tempKey = PK1Enc(bigpid, keyVec1);
int tempKeySum = 0;
for (int i = 0; i < tempKey.Count(); i++)
{
tempKeySum += tempKey[i];
}
tempKeySum = tempKeySum & 0xFF;
ArraySlice data = new ArraySlice(byteData);
for (int i = 0; i < drmCount; i++)
{
int verification = (int)data.getLong(i * 0x30);
int size = (int)data.getLong(i * 0x30 + 4);
int type = (int)data.getLong(i * 0x30 + 8);
int chkSum = (int)data.getByte(i * 0x30 + 12) & 0xFF;
byte[] cookie = data.byteSlice(i * 0x30 + 16, 32);
if (chkSum == tempKeySum)
{
Debug.WriteLine("Cookie: " + bytesToHex(cookie) + " Found at DRMCount: " + i);
Debug.WriteLine("Temp Key: " + bytesToHex(tempKey));
cookie = PK1Dec(cookie, tempKey, true);
Debug.WriteLine("Decrypted Cookie: " + bytesToHex(cookie) + " Found at DRMCount: " + i);
ArraySlice slice = new ArraySlice(cookie);
int ver = (int)slice.getLong();
int flags = (int)slice.getLong();
int finalkey = (int)slice.getLong();
if (verification == ver && ((flags & 0x1F) > 0))
{
Debug.WriteLine("W00000T");
}
}
}
Debug.WriteLine("PID: " + Encoding.Default.GetString(pid));
Debug.WriteLine("HEX BIGPID: " + bytesToHex(bigpid));
Debug.WriteLine("Key Vec: " + bytesToHex(keyVec1));
Debug.WriteLine("Temp Key: " + bytesToHex(tempKey));
Debug.WriteLine("Dec Key: " + bytesToHex(PK1Dec(tempKey, keyVec1, false)));
Debug.WriteLine("\n\n");
}
}
public MobiHeader(ArraySlice headerSlice)
{
mMagic = System.Text.Encoding.Default.GetString(headerSlice.byteSlice(0x3C, 8));
if (!mMagic.Equals(BOOK_MOBI) && !mMagic.Equals(TEXT_READ))
{
throw new Exception("Invalid File Format");
}
mNumSections = headerSlice.getShort(76);
}
public Section(ArraySlice slice)
{
offset = slice.getLong();
flags = slice.getByte();
val = (slice.getByte() << 16) | (slice.getByte() << 8) | (slice.getByte());
}
public MobiBook(String filename)
{
mEncMobiBook = getBookSlice(filename);
mHeader = new MobiHeader(mEncMobiBook);
mEncMobiBook.seek(MobiHeader.HEADER_SIZE);
for (int i = 0; i < mHeader.getNumberSections(); i++)
{
mSections.Add(new Section(mEncMobiBook));
}
int offset = (int)mSections[0].offset;
mCompression = mEncMobiBook.getShort(offset);
mRecords = mEncMobiBook.getShort(offset + 0x8);
if (mHeader.getMagicString().Equals(MobiHeader.TEXT_READ))
{
mExtraDataFlags = 0;
mMobiLength = 0;
mMobiCodepage = 0;
mMobiVersion = -1;
return;
}
mMobiLength = (int)mEncMobiBook.getLong(offset + 0x14);
mMobiCodepage = (int)mEncMobiBook.getLong(offset + 0x1c);
mMobiVersion = (int)mEncMobiBook.getLong(offset + 0x68);
if ((mMobiLength >= 0xE4) && (mMobiVersion >= 5))
{
mExtraDataFlags = mEncMobiBook.getShort(offset + 0xF2);
}
if (mCompression != 17480)
{
// multibyte utf8 data is included in the encryption for PalmDoc compression
// so clear that byte so that we leave it to be decrypted.
mExtraDataFlags &= 0xFFFE;
}
//if exth region exists parse it for metadata array
int exthFlag = (int)mEncMobiBook.getLong(offset + 0x80);
int exthOffset = 16 + mMobiLength;
if ((exthFlag & 0x40) > 0)
{
if ((exthOffset + mEncMobiBook.size() >= 4) && System.Text.Encoding.Default.GetString(mEncMobiBook.byteSlice(exthOffset + offset, 4)).Equals("EXTH"))
{
int nItems = (int)mEncMobiBook.getLong(exthOffset + offset + 8);
int pos = offset + exthOffset + 12;
for (int i = 0; i < nItems - 1; i++)
{
int type = (int)mEncMobiBook.getLong(pos);
int size = (int)mEncMobiBook.getLong(pos + 4);
mMetaMap[type] = mEncMobiBook.byteSlice(pos + 8, size - 8);
/* TODO:
# reset the text to speech flag and clipping limit, if present
# if type == 401 and size == 9:
# set clipping limit to 100%
# self.patchSection(0, "\144", 16 + self.mobi_length + pos + 8)
# elif type == 404 and size == 9:
# make sure text to speech is enabled
# self.patchSection(0, "\0", 16 + self.mobi_length + pos + 8)
*/
pos += size;
}
}
}
Debug.WriteLine(mHeader);
Debug.WriteLine("BookTitle: {0} \nMobiLength: {1} \nMobiCodePage {2}\nExtraDataFlags: {3} \nMobiVersion: {4}\n", getBookTitle(), mMobiLength, mMobiCodepage, mExtraDataFlags, mMobiVersion);
List <byte[]> pidList = new List <byte[]>();
pidList.Add(Encoding.Default.GetBytes("DL3pB54YXE"));
pidList.Add(Encoding.Default.GetBytes("DL3pB54Y"));
pidList.Add(Encoding.Default.GetBytes("SSEVC1U7"));
processBook(pidList);
}