private bool Decrypt(string sToken)
{
byte[] array = new byte[2048];
this.Clear();
int num = sToken.Length;
int num2 = 0;
for (int i = 0; i < num; i++)
{
int num3 = num2 >> 3;
int num4 = num2 & 7;
int num5 = (int)ScrambleTable.ReverseText[(int)sToken[i]];
int num6 = 6 - Math.Min(6, 8 - num4);
byte[] array2 = array;
int num7 = num3;
array2[num7] |= (byte)(num5 << 2 >> num4);
if (num6 > 0)
{
byte[] array3 = array;
int num8 = num3 + 1;
array3[num8] |= (byte)(num5 << 8 - num6 & 255);
}
num2 += 6;
}
num = num2 + 1 >> 3;
int num9 = ((int)array[0] << 8 | (int)array[1]) ^ (int)this.m_uPrivateKey;
for (int i = 2; i < num; i += 2)
{
int num10 = (int)array[i] << 8 | (int)array[i + 1];
array[i] = (byte)(ScrambleTable.Reverse16[num10] >> 8 & 255);
array[i + 1] = (byte)(ScrambleTable.Reverse16[num10] & 255);
int num11 = (int)array[i] << 8 | (int)array[i + 1];
array[i] = (byte)((num11 ^ (int)ScrambleTable.Convert16[num9 + 17 & 65535]) >> 8 & 255);
array[i + 1] = (byte)((num11 ^ (int)ScrambleTable.Convert16[num9 + 17 & 65535]) & 255);
num9 = num10;
}
num = ((int)array[2] << 8 | (int)array[3]);
int num12 = (num + 1) / 2 * 2;
this.m_nHashValue = (long)((ulong)array[num12 + 4]);
this.m_nHashValue = (this.m_nHashValue << 8 | (long)((ulong)array[num12 + 5]));
this.m_nHashValue = (this.m_nHashValue << 8 | (long)((ulong)array[num12 + 6]));
this.m_nHashValue = (this.m_nHashValue << 8 | (long)((ulong)array[num12 + 7]));
this.m_nHashValue = (this.m_nHashValue << 8 | (long)((ulong)array[num12 + 8]));
this.m_nHashValue = (this.m_nHashValue << 8 | (long)((ulong)array[num12 + 9]));
this.m_nHashValue = (this.m_nHashValue << 8 | (long)((ulong)array[num12 + 10]));
this.m_nHashValue = (this.m_nHashValue << 8 | (long)((ulong)array[num12 + 11]));
if (this.m_nHashValue == ParamEncoder.GetHashValue(array, 4, num12))
{
Array.Copy(array, 4, this.m_aBuffer, 0, num12);
this.m_nBufferSize = num;
return(true);
}
return(false);
}
private string Encrypt()
{
byte[] array = new byte[4096];
Random random = new Random((int)DateTime.Now.Ticks);
int i = 0;
int num = 0;
Encoding.ASCII.GetString(this.m_aBuffer);
int num2 = (this.m_nBufferSize + 1) / 2 * 2;
this.m_nHashValue = ParamEncoder.GetHashValue(this.m_aBuffer, 0, num2);
int num3 = random.Next(0, 65535);
array[0] = (byte)(num3 >> 8 & 255);
array[1] = (byte)(num3 & 255);
array[2] = (byte)(this.m_nBufferSize >> 8 & 255);
array[3] = (byte)(this.m_nBufferSize & 255);
Array.Copy(this.m_aBuffer, 0, array, 4, num2);
array[num2 + 4] = (byte)(this.m_nHashValue >> 56 & 255L);
array[num2 + 5] = (byte)(this.m_nHashValue >> 48 & 255L);
array[num2 + 6] = (byte)(this.m_nHashValue >> 40 & 255L);
array[num2 + 7] = (byte)(this.m_nHashValue >> 32 & 255L);
array[num2 + 8] = (byte)(this.m_nHashValue >> 24 & 255L);
array[num2 + 9] = (byte)(this.m_nHashValue >> 16 & 255L);
array[num2 + 10] = (byte)(this.m_nHashValue >> 8 & 255L);
array[num2 + 11] = (byte)(this.m_nHashValue & 255L);
array[num2 + 12] = 0;
for (int j = 2; j < num2 + 12; j += 2)
{
int num4 = ((int)array[j - 2] << 8 | (int)array[j - 1]) + 17 & 65535;
int num5 = (int)array[j] << 8 | (int)array[j + 1];
num5 ^= (int)ScrambleTable.Convert16[num4];
array[j] = (byte)(ScrambleTable.Convert16[num5] >> 8 & 255);
array[j + 1] = (byte)(ScrambleTable.Convert16[num5] & 255);
}
array[0] = (byte)((int)array[0] ^ (this.m_uPrivateKey >> 8 & 255));
array[1] = (byte)((ushort)array[1] ^ (this.m_uPrivateKey & 255));
int num6 = num2 + 12 << 3;
char[] array2 = new char[((num2 + 12) * 8 + 5) / 6];
while (i < num6)
{
int num7 = i >> 3;
int num8 = i & 7;
int num9 = 6 - Math.Min(6, 8 - num8);
int num10 = (int)array[num7] << num8 & 255;
num10 >>= 2;
if (num9 > 0)
{
num10 |= array[num7 + 1] >> 8 - num9;
}
if (num10 > 64)
{
return(null);
}
array2[num] = ScrambleTable.ConvertText[num10];
num++;
i += 6;
}
return(new string(array2));
}
