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1Decrypting an encrypted password from ASP.NET Membership using RijndaelManaged
2private string UnEncodePassword(string encodedPassword, string secretKey)
3    {
4        string password = encodedPassword;
5
6        var keyBytes = new byte[16];
7        var secretKeyBytes = Encoding.UTF8.GetBytes(secretKey);
8        Array.Copy(secretKeyBytes, keyBytes, Math.Min(keyBytes.Length, secretKeyBytes.Length));
9
10        RijndaelManaged rm = new RijndaelManaged
11        {
12            Mode = CipherMode.CBC,
13            Padding = PaddingMode.PKCS7,
14            KeySize = 128,
15            BlockSize = 128,
16            Key = keyBytes,
17            IV = keyBytes
18        };
19
20        var encryptedBytes = Convert.FromBase64String(encodedPassword);
21        password = Encoding.UTF8.GetString(Decrypt(encryptedBytes, rm));
22
23        return password;
24    }