private static RC4Session RC4CreateSession(byte[] key)
{
var session = new RC4Session { key = key, i = 0, j = 0, s_boxLen = 0x100 };
session.s_box = new byte[session.s_boxLen];
for(var i = 0; i < session.s_boxLen; i++)
session.s_box[i] = (byte) i;
var index = 0;
for(var j = 0; j < session.s_boxLen; j++) {
index = ((index + session.s_box[j]) + key[j % key.Length]) % session.s_boxLen;
var num4 = session.s_box[index];
session.s_box[index] = session.s_box[j];
session.s_box[j] = num4;
}
return session;
}
private static void RC4DoCrypt(ref RC4Session session, IList<byte> data, int index, int count)
{
var internalIndex = index;
do {
session.i = (session.i + 1) % 0x100;
session.j = (session.j + session.s_box[session.i]) % 0x100;
var num2 = session.s_box[session.i];
session.s_box[session.i] = session.s_box[session.j];
session.s_box[session.j] = num2;
var num3 = data[internalIndex];
var num4 = session.s_box[(session.s_box[session.i] + session.s_box[session.j]) % 0x100];
data[internalIndex] = (byte) (num3 ^ num4);
internalIndex++;
}
while(internalIndex != (index + count));
}
public void RC4Encrypt(ref RC4Session Session, byte[] Data, int Index, int count)
{
int index = Index;
do
{
Session.i = (Session.i + 1) % 0x100;
Session.j = (Session.j + Session.s_box[Session.i]) % 0x100;
byte num2 = Session.s_box[Session.i];
Session.s_box[Session.i] = Session.s_box[Session.j];
Session.s_box[Session.j] = num2;
byte num3 = Data[index];
byte num4 = Session.s_box[(Session.s_box[Session.i] + Session.s_box[Session.j]) % 0x100];
Data[index] = (byte)(num3 ^ num4);
index++;
}while (index != (Index + count));
}
private static void RC4DoCrypt(ref RC4Session session, IList <byte> data, int index, int count)
{
var internalIndex = index;
do
{
session.i = (session.i + 1) % 0x100;
session.j = (session.j + session.s_box[session.i]) % 0x100;
var num2 = session.s_box[session.i];
session.s_box[session.i] = session.s_box[session.j];
session.s_box[session.j] = num2;
var num3 = data[internalIndex];
var num4 = session.s_box[(session.s_box[session.i] + session.s_box[session.j]) % 0x100];
data[internalIndex] = (byte)(num3 ^ num4);
internalIndex++;
}while(internalIndex != (index + count));
}
private static RC4Session RC4CreateSession(byte[] key)
{
var session = new RC4Session {
key = key, i = 0, j = 0, s_boxLen = 0x100
};
session.s_box = new byte[session.s_boxLen];
for (var i = 0; i < session.s_boxLen; i++)
{
session.s_box[i] = (byte)i;
}
var index = 0;
for (var j = 0; j < session.s_boxLen; j++)
{
index = ((index + session.s_box[j]) + key[j % key.Length]) % session.s_boxLen;
var num4 = session.s_box[index];
session.s_box[index] = session.s_box[j];
session.s_box[j] = num4;
}
return(session);
}
public RC4Session RC4CreateSession(byte[] key)
{
RC4Session session = new RC4Session();
session.key = key;
session.i = 0;
session.j = 0;
session.s_boxLen = 0x100;
session.s_box = new byte[session.s_boxLen];
for (int i = 0; i < session.s_boxLen; i++)
{
session.s_box[i] = (byte)i;
}
int index = 0;
for (int j = 0; j < session.s_boxLen; j++)
{
index = ((index + session.s_box[j]) + key[j % key.Length]) % session.s_boxLen;
byte num4 = session.s_box[index];
session.s_box[index] = session.s_box[j];
session.s_box[j] = num4;
}
return(session);
}
public void Encrypt(Stream input, bool Dev)
{
byte[] retailkey;
BinaryReader reader = new BinaryReader(input);
BinaryWriter writer = new BinaryWriter(input);
byte[] buffer = new byte[((int)input.Length) + 0x18];
reader.BaseStream.Position = 0L;
reader.Read(buffer, 0x18, (int)input.Length);
Random random = new Random();
for (int i = 0x10; i < 0x18; i++)
{
buffer[i] = (byte)random.Next(0, 0x100);
}
if (!Dev)
{
retailkey = AccountDecryption.retailkey;
}
else
{
retailkey = devkey;
}
byte[] sourceArray = new HMACSHA1(retailkey).ComputeHash(buffer, 0x10, buffer.Length - 0x10);
Array.Copy(sourceArray, buffer, 0x10);
byte[] array = new HMACSHA1(retailkey).ComputeHash(sourceArray, 0, 0x10);
Array.Resize <byte>(ref array, 0x10);
RC4Session session = RC4CreateSession(array);
RC4Encrypt(ref session, buffer, 0x10, buffer.Length - 0x10);
writer.BaseStream.Position = 0L;
writer.Write(buffer);
input.SetLength((long)buffer.Length);
input.Close();
MessageBox.Show("Encrypted successfully");
}
public int Decrypt(System.IO.Stream input, int overridekey, bool Dev)
{
byte[] retailkey;
BinaryReader reader = new BinaryReader(input);
BinaryWriter writer = new BinaryWriter(input);
reader.BaseStream.Position = 0L;
byte[] buffer = reader.ReadBytes((int)input.Length);
new HMACSHA1();
if (!Dev)
{
retailkey = AccountDecryption.retailkey;
}
else
{
retailkey = devkey;
}
if (overridekey == 1)
{
retailkey = AccountDecryption.retailkey;
}
else if (overridekey == 2)
{
retailkey = devkey;
}
byte[] array = new HMACSHA1(retailkey).ComputeHash(buffer, 0, 0x10);
Array.Resize <byte>(ref array, 0x10);
RC4Session session = RC4CreateSession(array);
RC4Encrypt(ref session, buffer, 0x10, 8);
RC4Encrypt(ref session, buffer, 0x18, buffer.Length - 0x18);
byte[] buffer4 = new HMACSHA1(retailkey).ComputeHash(buffer, 0x10, buffer.Length - 0x10);
if (memcmp(buffer, buffer4, 0x10))
{
writer.BaseStream.Position = 0L;
writer.Write(buffer, 0x18, buffer.Length - 0x18);
writer.BaseStream.SetLength((long)(buffer.Length - 0x18));
writer.Close();
if (memcmp(retailkey, AccountDecryption.retailkey, 0x10))
{
Dev = false;
}
else if (memcmp(retailkey, devkey, 0x10))
{
Dev = true;
}
return(1);
}
else
{
writer.Close();
if (overridekey == 0)
{
if (memcmp(retailkey, AccountDecryption.retailkey, 0x10))
{
Decrypt(input, 2, Dev);
}
else if (memcmp(retailkey, devkey, 0x10))
{
Decrypt(input, 1, Dev);
}
}
else
{
return(-1);;
}
}
return(1);
}
public void ResetSession(ref RC4Session Session)
{
Session = RC4CreateSession(Session.key);
}
public void RC4Decrypt(ref RC4Session Session, byte[] Data, int Index, int count)
{
RC4Encrypt(ref Session, Data, Index, count);
}
