Stripped ProjectAlchemy Source Code

Quote:

Originally Posted by pro4never Here's from my source using same kinda system. byte[] Password = read from the packet. Code: string Pass; msvcrt.msvcrt.srand(Client.PassSeed); var rc5Key = new byte[0x10]; for (int i = 0; i < 0x10; i++) rc5Key[i] = (byte)msvcrt.msvcrt.rand(); ConquerPasswordCryptpographer A = new ConquerPasswordCryptpographer(User); Encryption.RC5 B = new Encryption.RC5(rc5Key); Pass = Encoding.ASCII.GetString( (new ConquerPasswordCryptpographer(User).Decrypt(new Encryption.RC5(rc5Key).Decrypt(Password)))); Pass = Pass.Replace("\0", ""); I just use the released liberate cryptography dll, msvcrt dll and then the following pass crypt class. Code: public sealed class RC5Exception : Exception { public RC5Exception(string message) : base(message) { } } public sealed class RC5 { private readonly uint[] _bufKey = new uint[4]; private readonly uint[] _bufSub = new uint[26]; public RC5(byte[] data) { if (data.Length != 16) throw new RC5Exception("Invalid data length. Must be 16 bytes"); const uint p32 = 0xB7E15163; const uint q32 = 0x61C88647; uint offsetA = 0, offsetB = 0, A = 0, B = 0; for (int i = 0; i < 4; i++) _bufKey[i] = (uint)(data[i * 4] + (data[i * 4 + 1] << 8) + (data[i * 4 + 2] << 16) + (data[i * 4 + 3] << 24)); _bufSub[0] = p32; for (int i = 1; i < 26; i++) { _bufSub[i] = _bufSub[i - 1] - q32; } for (int s = 1; s <= 78; s++) { _bufSub[offsetA] = LeftRotate(_bufSub[offsetA] + A + B, 3); A = _bufSub[offsetA]; offsetA = (offsetA + 1) % 0x1A; _bufKey[offsetB] = LeftRotate(_bufKey[offsetB] + A + B, (int)(A + B)); B = _bufKey[offsetB]; offsetB = (offsetB + 1) % 4; } } public byte[] Decrypt(byte[] data) { if (data.Length % 8 != 0) throw new RC5Exception("Invalid password length. Must be multiple of 8"); int nLen = data.Length / 8 * 8; if (nLen <= 0) throw new RC5Exception("Invalid password length. Must be greater than 0 bytes."); uint[] bufData = new uint[data.Length / 4]; for (int i = 0; i < data.Length / 4; i++) bufData[i] = (uint)(data[i * 4] + (data[i * 4 + 1] << 8) + (data[i * 4 + 2] << 16) + (data[i * 4 + 3] << 24)); for (int i = 0; i < nLen / 8; i++) { uint ld = bufData[2 * i]; uint rd = bufData[2 * i + 1]; for (int j = 12; j >= 1; j--) { rd = RightRotate((rd - _bufSub[2 * j + 1]), (int)ld) ^ ld; ld = RightRotate((ld - _bufSub[2 * j]), (int)rd) ^ rd; } uint B = rd - _bufSub[1]; uint A = ld - _bufSub[0]; bufData[2 * i] = A; bufData[2 * i + 1] = B; } byte[] result = new byte[bufData.Length * 4]; for (int i = 0; i < bufData.Length; i++) { result[i * 4] = (byte)bufData[i]; result[i * 4 + 1] = (byte)(bufData[i] >> 8); result[i * 4 + 2] = (byte)(bufData[i] >> 16); result[i * 4 + 3] = (byte)(bufData[i] >> 24); } return result; } public byte[] Encrypt(byte[] data) { if (data.Length % 8 != 0) throw new RC5Exception("Invalid password length. Must be multiple of 8"); int nLen = data.Length / 8 * 8; if (nLen <= 0) throw new RC5Exception("Invalid password length. Must be greater than 0 bytes."); uint[] bufData = new uint[data.Length / 4]; for (int i = 0; i < data.Length / 4; i++) bufData[i] = (uint)(data[i * 4] + (data[i * 4 + 1] << 8) + (data[i * 4 + 2] << 16) + (data[i * 4 + 3] << 24)); for (int i = 0; i < nLen / 8; i++) { uint A = bufData[i * 2]; uint B = bufData[i * 2 + 1]; uint le = A + _bufSub[0]; uint re = B + _bufSub[1]; for (int j = 1; j <= 12; j++) { le = LeftRotate((le ^ re), (int)re) + _bufSub[j * 2]; re = LeftRotate((re ^ le), (int)le) + _bufSub[j * 2 + 1]; } bufData[i * 2] = le; bufData[i * 2 + 1] = re; } byte[] result = new byte[bufData.Length * 4]; for (int i = 0; i < bufData.Length; i++) { result[i * 4] = (byte)bufData[i]; result[i * 4 + 1] = (byte)(bufData[i] >> 8); result[i * 4 + 2] = (byte)(bufData[i] >> 16); result[i * 4 + 3] = (byte)(bufData[i] >> 24); } return result; } internal static uint LeftRotate(uint dwVar, int dwOffset) { return (dwVar << (dwOffset & 0x1F) | dwVar >> 0x20 - (dwOffset & 0x1F)); } internal static uint RightRotate(uint dwVar, int dwOffset) { return (dwVar >> (dwOffset & 0x1F) | dwVar << 0x20 - (dwOffset & 0x1F)); } }