Package dev.uni_hamburg.security.otp

Class TimeDriftTotp

java.lang.Object

dev.uni_hamburg.security.otp.TimeDriftTotp

public final class TimeDriftTotp
extends Object

Constructor Summary

Constructors

Constructor	Description
TimeDriftTotp(String secret)
TimeDriftTotp(String secret, int lookAheadInterval, int lookBehindInterval)
TimeDriftTotp(String secret, int lookAheadInterval, int lookBehindInterval, int timeDriftCorrection)
TimeDriftTotp(String secret, Clock clock)
TimeDriftTotp(String secret, Clock clock, int lookAheadInterval, int lookBehindInterval)
TimeDriftTotp(String secret, Clock clock, int lookAheadInterval, int lookBehindInterval, int timeDriftCorrection)

Method Summary

Modifier and Type	Method	Description
protected int	generate(String secret, long interval)
int	getLookAheadInterval()
int	getLookBehindInterval()
int	getTimeDriftCorrection()
String	now()	Retrieves the current OTP
boolean	train(String otp)
String	uri(String name)	Prover - To be used only on the client side Retrieves the encoded URI to generated the QRCode required by Google Authenticator
boolean	verify(String otp)	Verifier - To be used only on the server side Taken from Google Authenticator with small modifications from PasscodeGenerator.java Verify a timeout code.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TimeDriftTotp

public TimeDriftTotp(String secret)

TimeDriftTotp

public TimeDriftTotp(String secret,
                     Clock clock)

TimeDriftTotp

public TimeDriftTotp(String secret,
                     int lookAheadInterval,
                     int lookBehindInterval)

TimeDriftTotp

public TimeDriftTotp(String secret,
                     int lookAheadInterval,
                     int lookBehindInterval,
                     int timeDriftCorrection)

TimeDriftTotp

public TimeDriftTotp(String secret,
                     Clock clock,
                     int lookAheadInterval,
                     int lookBehindInterval)

TimeDriftTotp

public TimeDriftTotp(String secret,
                     Clock clock,
                     int lookAheadInterval,
                     int lookBehindInterval,
                     int timeDriftCorrection)

Method Detail

verify

public boolean verify(String otp)

Verifier - To be used only on the server side Taken from Google Authenticator with small modifications from PasscodeGenerator.java Verify a timeout code. The timeout code will be valid for a time determined by the interval period and the number of adjacent intervals checked.

Parameters:

otp - Timeout code

Returns:

True if the timeout code is valid Author: sweis@google.com (Steve Weis)

train

public boolean train(String otp)

getLookAheadInterval

public int getLookAheadInterval()

getLookBehindInterval

public int getLookBehindInterval()

getTimeDriftCorrection

public int getTimeDriftCorrection()

uri

public String uri(String name)

Prover - To be used only on the client side Retrieves the encoded URI to generated the QRCode required by Google Authenticator

Parameters:

name - Account name

Returns:

Encoded URI

now

public String now()

Retrieves the current OTP

Returns:

OTP

generate

protected int generate(String secret,
                       long interval)