Java

Generate TOTP using Base32 Secret (6 Digits, Time-based, 30-second period)

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Generates a 6-digit time-based TOTP code using a base32 secret with a 30-second time period. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.
    // 
    CkCrypt2 crypt = new CkCrypt2();

    // Base32 secret key:
    String secretKey = "oebf ytfl qmzb p4xd 2ztf zyz4 hjrw 3uyo";

    CkStringBuilder sbKey = new CkStringBuilder();
    success = sbKey.Append(secretKey);

    // Remove SPACE chars.
    int numRemoved = sbKey.Replace(" ","");

    // Note: A new token is generated every 30 seconds.  You must generate within the same 30 second interval to get the same result.

    // Generate 6 digits.
    int numDigits = 6;
    // 30 second time period.
    int timePeriod = 30;
    System.out.println("Your token is: " + crypt.totp(sbKey.getAsString(),"base32","0","",timePeriod,numDigits,-1,"sha1"));
  }
}