private static string EncodeBase64Check(byte[] input)
{
SHA256Managed m = new SHA256Managed();
byte[] re = m.ComputeHash(input);
re = m.ComputeHash(re);
byte[] checksum = new byte[4];
Buffer.BlockCopy(re, 0, checksum, 0, 4);
byte[] base64checksum = input.Concatenate(checksum);
Base64Encoder enc = new Base64Encoder();
return(enc.EncodeData(base64checksum));
}
