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);
}
}
public static byte[] DecryptCompressedInt32Data(Arg64ConstantsReader constReader, int exprStart, int exprEnd, IBinaryReader reader, byte[] decrypted)
{
for (int i = 0; i < decrypted.Length; i++)
{
constReader.Arg = reader.Read7BitEncodedInt32();
int index = exprStart;
long result;
if (!constReader.GetInt64(ref index, out result) || index != exprEnd)
{
throw new ApplicationException("Could not decrypt integer");
}
decrypted[i] = (byte)result;
}
return(decrypted);
}
/// <summary>
/// Reads a <see cref="string"/> from the current position and increments
/// <see cref="IBinaryReader.Position"/> by the length of the string.
/// </summary>
/// <param name="reader">this</param>
/// <param name="encoding">Encoding</param>
/// <returns>The string</returns>
public static string ReadString(this IBinaryReader reader, Encoding encoding)
{
int len = reader.Read7BitEncodedInt32();
return(encoding.GetString(reader.ReadBytes(len)));
}
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;
}
}
public static byte[] DecryptCompressedInt32Data(Arg64ConstantsReader constReader, int exprStart, int exprEnd, IBinaryReader reader, byte[] decrypted) {
for (int i = 0; i < decrypted.Length; i++) {
constReader.Arg = reader.Read7BitEncodedInt32();
int index = exprStart;
long result;
if (!constReader.GetInt64(ref index, out result) || index != exprEnd)
throw new ApplicationException("Could not decrypt integer");
decrypted[i] = (byte)result;
}
return decrypted;
}
