public override byte[] GetMethodsData(EmbeddedResource resource)
{
var reader = resource.Data;
reader.Position = startOffset;
var decrypted = new byte[reader.Read7BitEncodedUInt32()];
uint origCrc32 = reader.ReadUInt32();
long pos = reader.Position;
var keys = new byte[][] { decryptionKey, decryptionKey6, decryptionKey7 };
foreach (var key in keys)
{
try {
reader.Position = pos;
Decompress(decrypted, reader, key, decryptionKeyMod);
uint crc32 = CRC32.CheckSum(decrypted);
if (crc32 == origCrc32)
{
return(decrypted);
}
}
catch (OutOfMemoryException) {
}
catch (IOException) {
}
}
throw new ApplicationException("Could not decrypt methods data");
}
public static DecrypterV106 Create(IBinaryReader reader)
{
try {
int keyXorOffs7 = (ReadByteAt(reader, 0) ^ ReadByteAt(reader, 2)) + 2;
reader.Position = keyXorOffs7 + (ReadByteAt(reader, 1) ^ ReadByteAt(reader, keyXorOffs7));
int sha1DataLen = reader.Read7BitEncodedInt32() + 0x80;
int keyXorOffs6 = (int)reader.Position;
int encryptedOffs = (int)reader.Position + sha1DataLen;
var sha1Data = reader.ReadBytes(sha1DataLen);
uint crc32 = CRC32.CheckSum(sha1Data);
reader.Position = reader.Length - 0x18;
uint origCrc32 = reader.ReadUInt32();
if (crc32 != origCrc32)
{
return(null);
}
var key0 = DeobUtils.Sha1Sum(sha1Data); // 1.0.6.0
var key6 = GetKey(reader, key0, keyXorOffs6); // 1.0.6.6
var key7 = GetKey(reader, key0, keyXorOffs7); // 1.0.6.7
return(new DecrypterV106(key0, key6, key7, encryptedOffs));
}
catch (IOException) {
return(null);
}
}
private bool CheckSumOK(ByteArrayBuffer buffer, int offset)
{
var initialOffSet = buffer.Offset();
var length = OwnLength();
length -= ChecksumLength;
buffer.Seek(offset);
var readCheckSum = buffer.ReadLong();
var checkSumBeginOffset = buffer.Offset();
var bytes = buffer._buffer;
var calculatedCheckSum = CRC32.CheckSum(bytes, checkSumBeginOffset, length);
buffer.Seek(initialOffSet);
return(calculatedCheckSum == readCheckSum);
}
private void Marshall(ByteArrayBuffer buffer, bool shuttingDown)
{
var checkSumOffset = buffer.Offset();
buffer.IncrementOffset(ChecksumLength);
var checkSumBeginOffset = buffer.Offset();
WriteBuffer(buffer, shuttingDown);
var checkSumEndOffSet = buffer.Offset();
var bytes = buffer._buffer;
var length = checkSumEndOffSet - checkSumBeginOffset;
var checkSum = CRC32.CheckSum(bytes, checkSumBeginOffset, length);
buffer.Seek(checkSumOffset);
buffer.WriteLong(checkSum);
buffer.Seek(checkSumEndOffSet);
}
public void Test()
{
int[] ints = new int[] {
int.MinValue,
-1,
0,
1,
int.MaxValue
};
int bufferLength = Const4.IntLength * ints.Length;
ByteArrayBuffer buffer = new ByteArrayBuffer(bufferLength);
for (int i = 0; i < ints.Length; i++)
{
buffer.WriteInt(ints[i]);
}
long checkSum = CRC32.CheckSum(buffer._buffer, 0, buffer._buffer.Length);
_expectedJavaOutput = checkSum.ToString();
RunTest();
}
