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Using libotp

libotp is a simple java One-time password generator library, which can easily be used to facilitate two-factor authentication in Java applications. The library current supports the standard RFC counter based (hotp) and time based (totp) algorithms. Custom OTP providers can also be written by implementing the OTPProvider interface.

Example

Below is an example of generating time-based password

OTP.generate("12345678", "" + System.currentTimeMillis(), 6, "totp")

Following is an example of counter-based password

OTP.generate("helloworld", "2", 6, "hotp")

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A simple Java OTP (One Time Password) generator library, currently supports RFC standard time based and counter based algorithms.

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