Generate a Short EmailConfirmationToken for Email Confirmation

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I'm trying to implement a registration prozess for my webapp. I am using this process for generating a EmailConfirmationToken and sending it via email to the user.

C#

if (result.Succeeded)
 {
     string code = await userManager.GenerateEmailConfirmationTokenAsync(user.Id);
     Uri baseUri = new Uri(OpenIdConnectAuthenticationAuthority);
     Uri callbackUrl = new Uri(baseUri + "/Register/ConfirmEmail/?userId=" + user.Id + "&code=" + HttpUtility.UrlEncode(code));
     await userManager.SendEmailAsync(user.Id, "BIMcube eMail Confirmation", "Please confirm your account by clicking this link: <a href=\"" + callbackUrl + "\">link</a>");
 }

The generated token is very long. This is a example token:

XML

AQAAANCMnd8BFdERjHoAwE/Cl+sBAAAA48Afnm/pyU6UZrt2VXGfHAAAAAACAAAAAAADZgAAwAAAABAAAABa10013CpPZN7NSwTZYu03AAAAAASAAACgAAAAEAAAAHFDDmUWdvgFz4QCqe0ML/1gAAAAN7hpoCFiW8NcTaMNCGMLALUYL0gcfXbPjXQddI5w68mm4FfbVhMkJPbL+JTA8RXZ7mb6VgNmxS/cxdMzy5BQdIdVUIWzQYPwBlX6Oimx+zESVcCSpUSVpwI05+ls79nmFAAAAPTqCR7RSVR5zQT3UaJlcd1BokRr

My UserTokenProvider is implemented like this:

C#

var dataProtectionProvider = new DpapiDataProtectionProvider("IdentityServer3");

        if (dataProtectionProvider != null)
        {
            UserTokenProvider = new DataProtectorTokenProvider<User>(dataProtectionProvider.Create("ASP.NET Identity"))
            {
                TokenLifespan = TimeSpan.FromHours(3)
            };
        }

Is there any possibility for generating a short code for email confirmation? Do you have an idea what I need to implement?

Posted 6-Oct-15 20:34pm

Airbag

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Member 12003400 · Answer 1 · 2015-10-06T21:06:00

For unique token create GUID

string strToken = Convert.ToBase64String(Guid.NewGuid().ToByteArray());

Or you can use date time time stamp and generate token.
byte[] time = BitConverter.GetBytes(DateTime.UtcNow.ToBinary());
byte[] key = Guid.NewGuid().ToByteArray();
string token = Convert.ToBase64String(time.Concat(key).ToArray());