Very simple Java library for generating and/or validating time-based one-time passwords, following the TOTP (RFC6238) algorithm.
Adding a dependency to the library, using Gradle:
repositories {
jcenter()
}
dependencies {
implementation 'io.github.butshuti:jtotp:1.0.+'
}//Create an instance with the default HMAC mode ("HMACSHA1")
TOTP totp = new TOTP();
/*
Create an instance with a given HMAC mode
(validity and availability will depend on JDK or crypto engines)
*/
TOTP totp = new TOTP("HMACSHA1");
/*
Generate new OTP code using a given secret
String secret = "some secret....";
*/
String code = totp.getOTP(secret);
//Validate a given OTP code
boolean isValid = totp.validateCode(code, secret);RFC6238 -- TOTP: Time-Based One-Time Password Algorithm
Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
Please make sure to update tests as appropriate.
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