Google Authenticator (Convert To Java & Create basic APIs)

Using the Open Source Project Google Authenticator ([login to view URL]) , Apps & PAM module in it. I need the following : I need a clean APIs convert the code to Java and package it as Library (POJO classes only) . the API will cover all basic functions of the PAM module when creating dual factor account for the user & validate the OTP code. Please note I do NOT need PAM module, it's just has part of the code is there. Those APIs should be valid implementation and it will be tested against Google Authenticator Apps & PAM module This should be 3 simple classes, to make it clear please implement those interfaces /** * Google Authenticator PAM module stores those information in a text file * Please refer to file (FILEFORMAT) you add to this if something missing */ public class DualFactorAccountConfiguration { //This is used with [login to view URL]() public String key="AAAAAAAAAAAAAAAA"; public enum OTPType{ TOTP , HOTP } public OTPType otpType=[login to view URL]; public int HOTPCounter=1; public int rateLimit=0; public int windowSize=0; public boolean disallowReuse=false; } public interface SecretKeyGenerator { /** * Generates The BASE32 key as Google Authenticator PAM module (convert the C code) * * @return a BASE32 */ String generate(); } public interface DualFactorAccount { /** * Validates the OTP code against the configuration object, You may need to * update the counter (if [login to view URL]), please check the case in * (the Google Authenticator PAM module C code) * * @param config the account's configuration * @param otp the one-time-password to be validated * @param updateConfig if false don't update the configuration object * @return true if code is valid ! */ public boolean validate(DualFactorAccountConfiguration config, int otp, boolean updateConfig); /** * Generates a new OTP code the return code should always be asserted * by [login to view URL](...) * * @param config the account's configuration * * @return OTP code */ public int getOTP(DualFactorAccountConfiguration config); }