static void Main1(string[] args)
{
var uid = Guid.NewGuid();
var uidBytes = uid.ToByteArray();
var base32 = Base32.Encode(uidBytes);
var base64 = Convert.ToBase64String(uidBytes);
Console.WriteLine($"base16 : {uid:n}");
Console.WriteLine($"base32 : {base32}");
Console.WriteLine($"base64 : {base64}");
var fromBase32 = new Guid(Base32.Decode(base32));
var fromBase64 = new Guid(Convert.FromBase64String(base64));
Console.WriteLine();
Console.WriteLine($"====== And back ======");
Console.WriteLine();
Console.WriteLine($"original : {uid:n}");
Console.WriteLine($"from base32 : {fromBase32:n}");
Console.WriteLine($"from base64 : {fromBase64:n}");
Console.WriteLine();
Console.WriteLine($"====== With checksum digit ======");
Console.WriteLine();
Console.WriteLine(AddChecksum("pay" + base32));
Console.WriteLine(AddChecksum("evt" + base32));
Console.WriteLine(AddChecksum("wbh" + base32));
}
/// <summary>
/// Proof of concept implementation of the checksum algorithm as proposed in
/// Crockford's base32.Note there's certainly more efficient ways of doing this ...
/// </summary>
/// <param name="base32"></param>
/// <returns></returns>
static string AddChecksum(string base32)
{
var payBytes = Base32.Decode(base32);
var bigInt = new System.Numerics.BigInteger(payBytes);
var remainder = bigInt % 37;
if (remainder.Sign < 0)
{
remainder += 37;
}
var checksumDigits = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567*~$9".ToLower().ToCharArray();
var checksumDigit = checksumDigits[(byte)remainder];
return(base32 + checksumDigit);
}
public static Guid FromBase32(string base32) => new Guid(Base32.Decode(base32));
