gov.nist.secauto.swid.client.totp

Class Totp

java.lang.Object

gov.nist.secauto.swid.client.totp.Totp

public class Totp
extends Object

A direct implementation of https://tools.ietf.org/html/rfc6238.

Constructor Summary

Constructors

Constructor and Description
Totp() Creates a default Totp instance with a 30 second time step, T0 of 0 using HMAC-SHA-1 producing an 8 digit output.
Totp(Hotp.HashAlgorithm algorithm, int digits) Creates a Totp instance with a 30 second time step, T0 of 0 using the provided parameters.
Totp(int timeStepSeconds, long T0, Hotp.HashAlgorithm algorithm, int digits) Creates a Totp instance with a 30 second time step, T0 of 0 using the provided parameters.

Method Summary

Modifier and Type	Method and Description
String	totp(byte[] key) Calculates a TOTP result using the provided key and the current time
String	totp(byte[] key, long time) Calculates a TOTP result using the provided key and provided time

Methods inherited from class java.lang.Object

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

Constructor Detail

Totp

public Totp()

Creates a default Totp instance with a 30 second time step, T0 of 0 using HMAC-SHA-1 producing an 8 digit output.

Totp

public Totp(Hotp.HashAlgorithm algorithm,
            int digits)

Creates a Totp instance with a 30 second time step, T0 of 0 using the provided parameters.

Parameters:

algorithm - the algorithm to use

digits - the number of digits

Totp

public Totp(int timeStepSeconds,
            long T0,
            Hotp.HashAlgorithm algorithm,
            int digits)

Creates a Totp instance with a 30 second time step, T0 of 0 using the provided parameters.

Parameters:

timeStepSeconds - the size of the time step in seconds (this is X in the RFC)

algorithm - the algorithm to use

T0 - the time adjustment from UNIX time in seconds (based on UTC and the epoch)

digits - the number of digits

See Also:

Hotp

Method Detail

totp

public String totp(byte[] key)

Calculates a TOTP result using the provided key and the current time

Parameters:

key - the key/seed to use for calculating the value

Returns:

the TOTP value for the current time point

totp

public String totp(byte[] key,
                   long time)

Calculates a TOTP result using the provided key and provided time

Parameters:

key - the key/seed to use for calculating the value

time - the time value to use

Returns:

the TOTP value for the provided time point