public override byte[] Decode(byte[] secretData)
{
int ivN = TEXTSET64.IndexOf((char)secretData[0]);
var iv = secretData.Skip(1).Take(16).ToArray();
using (var rijndael = new RijndaelManaged
{
BlockSize = 128,
KeySize = 128,
Mode = CipherMode.CBC,
Padding = PaddingMode.PKCS7,
IV = iv,
Key = Encoding.ASCII.GetBytes(FusionString(KEY, MASK)),
})
{
var de = rijndael.CreateDecryptor(rijndael.Key, rijndael.IV);
using (var ms = new MemoryStream(secretData, 17, secretData.Length - 17, false))
{
using (var cs = new CryptoStream(ms, de, CryptoStreamMode.Read))
{
var ret = new byte[secretData.Length - 17];
ms.Read(ret, 0, ret.Length);
return(ret);
}
}
}
}
/// <summary>
/// Make Fusion string
/// </summary>
/// <param name="basestr"></param>
/// <param name="filter"></param>
/// <returns></returns>
private string FusionString(string basestr, string filter)
{
var ret = new StringBuilder(basestr);
var nB = basestr.Length;
var nF = filter.Length;
var offset = 0;
for (var i = Math.Max(nB, nF) - 1; i >= 0; i--)
{
ret[i % nB] = TEXTSET64[(TEXTSET64.IndexOf(ret[i % nB]) + (int)filter[i % nF] + OffsetSamples[(i + offset) % OffsetSamples.Length]) % TEXTSET64.Length];
offset++;
}
return(ret.ToString());
}
/// <summary>
/// Rijndael Decoding
/// </summary>
/// <param name="secretText"></param>
/// <returns></returns>
public override string Decode(string secretText)
{
int ivN = TEXTSET64.IndexOf(secretText[0]);
string iv = secretText.Substring(1, ivN + 16);
string sec = secretText.Substring(ivN + iv.Length + 1);
using (var rijndael = new RijndaelManaged
{
BlockSize = 128,
KeySize = 128,
Mode = CipherMode.CBC,
Padding = PaddingMode.PKCS7,
IV = Encoding.ASCII.GetBytes(iv),
Key = Encoding.ASCII.GetBytes(FusionString(KEY, MASK)),
})
{
var de = rijndael.CreateDecryptor(rijndael.Key, rijndael.IV);
using (var ms = new MemoryStream(Convert.FromBase64String(sec)))
{
using (var cs = new CryptoStream(ms, de, CryptoStreamMode.Read))
{
using (var sr = new StreamReader(cs))
{
var ret = sr.ReadToEnd();
if (ret == NullDescriptor)
{
return(null);
}
else
{
return(ret);
}
}
}
}
}
}
