Basic example

This tutorial shows a basic example of how to use the library.

using SimpleOTP;

// Create a new secret
// Make sure to dispose of the secret after use
using OtpSecret secret = OtpSecret.CreateNew();

// Create a new generator
Otp generator = new Totp(secret);

// Optionally, you can customize default options
// generator.Period = 30;
// generator.Digits = 6;
// generator.Algorith = OtpAlgorithm.SHA1;

// Generate the code
OtpCode code = generator.Generate(); // { _value = 1234, _digits = 6, CanExpire = true, ExpirationTime = <current date + 30 seconds> }
Console.WriteLine(code); // 012345

// Verify the code
generator.Validate(code); // True

await Task.Delay(30000); // 30 seconds
generator.Validate(code); // False
generator.Validate(code, new ToleranceSpan(behind: 1, ahead: 3)); // True

// Create new config
OtpConfig config = new("user@example.com", "My app");

// Optionally, you can set pre-generated secret and customize other properties
// OtpConfig config = new("user@example.com", "My app", secret);
// config.Algorithm = OtpAlgorithm.SHA256;
// config.Digits = 8;
// ...

// Create a URI
Uri uri = config.ToUri();
Console.WriteLine(uri); // otpauth://totp/user@example.com?secret=KRUGKIDROVUWG2ZAMJZG653OEBTG66BO&issuer=My%20app

// Read config from URI
OtpConfig config2 = OtpConfig.Parse(uri);
Console.WriteLine(config == config2); // True

// Make sure to dispose of created secrets
config.Secret.Dispose();
config2.Secret.Dispose();