Java

TOTP Authenticator: Duplicate Results of Online Tools

See more Encryption Examples

Duplicates the online tool for the Google 2FA Authenticator online tools at

• https://rootprojects.org/authenticator/
• https://pragmarx.com/playground/google2fa#/

Chilkat2 Java

import com.chilkatsoft.chilkat2.Crypt2;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.
        //
        // Note: This example was written on 7-March-2020.  If the online tools have since changed, the instructions provided here may no longer be valid.
        //

        Crypt2 crypt = new Crypt2();

        // ---------------------------------------------------------------------------------------------
        // To duplicate the results of the Authenticator Test at https://rootprojects.org/authenticator/
        // do the following:
        // 1) At the bottom of the screen you will see a URI such as:
        //
        //    otpauth://totp/ACME%20Co:john@example.com?secret=HXDMVJECJJWSRB3HWIZR4IFUGFTMXBOZ&issuer=ACME%20Co&algorithm=SHA1&digits=6&period=30
        //
        //    Use the uppercase secret.  For example:
        String secretKey = "HXDMVJECJJWSRB3HWIZR4IFUGFTMXBOZ";

        // 2) DO NOT cick the "Regenerate" button.  The regenerate button will generate a new secret.
        //
        // 3) Run the following code to generate your 6-digit token.  Compare with the token shown in the picture of the iPhone at https://rootprojects.org/authenticator/
        //      Note: A new token is generated every 30 seconds.  You must generate within the same 30 second interval to get the same result.
        System.out.println("Your token is: " + crypt.totp(secretKey, "base32", "0", "", 30, 6, -1, "sha1"));

        // ---------------------------------------------------------------------------------------------
        // To duplicate the results of the Google2FA Playground at https://pragmarx.com/playground/google2fa#/
        // do the following:

        // 1) Copy the 64-byte secret key:
        secretKey = "OR2VQTRVHB2HO2LCGVWXQSCDK5ZHQS2D3THQ6UXO57XIE7ZHOWS6HDPQ622GU747";

        // 2) Run the same code:
        //    (Note: The online tool generates a new result every 30 seconds.  You must generate and compare within the same 30-second interval.)
        System.out.println("Your token is: " + crypt.totp(secretKey, "base32", "0", "", 30, 6, -1, "sha1"));
    }
}