OTPUtil

java.lang.Object

util.OTPUtil

public class OTPUtil extends Object

Utility class for generating and verifying time-based OTPs Uses current time as seed for synchronized OTP generation

Author:: TAMIL MUGHILAN

Constructor Summary

Constructors

Constructor

Description

OTPUtil()
Method Summary

Modifier and Type

Method

Description

static String

generateOTP()

Generates a 6-digit OTP using current time as seed.

static String

generateOTPWithSeed(long seed)

Generates OTP with custom seed for testing purposes.

static boolean

verifyOTP(String enteredOTP)

Verifies if the entered OTP matches the expected OTP.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details
- OTPUtil
  
  public OTPUtil()
Method Details
- generateOTP
  
  public static String generateOTP()
  
  Generates a 6-digit OTP using current time as seed. Uses minutes to ensure same OTP within same minute.
  
  Returns:
  
  6-digit OTP as String
- verifyOTP
  
  public static boolean verifyOTP(String enteredOTP)
  
  Verifies if the entered OTP matches the expected OTP. Generates expected OTP using current time and compares.
  
  Parameters:
  
  enteredOTP - the OTP entered by user
  
  Returns:
  
  true if OTP is valid, false otherwise
- generateOTPWithSeed
  
  public static String generateOTPWithSeed(long seed)
  
  Generates OTP with custom seed for testing purposes. Useful for testing with known seeds.
  
  Parameters:
  
  seed - custom seed for random number generation
  
  Returns:
  
  6-digit OTP as String