Package com.yubico.yubikit.core.otp

Class ChecksumUtils

java.lang.Object

com.yubico.yubikit.core.otp.ChecksumUtils

public class ChecksumUtils
extends Object

Utility methods for calculating and verifying the CRC13239 checksum used by YubiKeys.

Method Summary

Modifier and Type	Method	Description
static short	calculateCrc(byte[] data, int length)	Calculate the CRC13239 checksum for a byte buffer.
static boolean	checkCrc(byte[] data, int length)	Verifies a checksum.

Methods inherited from class java.lang.Object

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

Method Details

calculateCrc

public static short calculateCrc(byte[] data,
 int length)

Calculate the CRC13239 checksum for a byte buffer.

Parameters:

data - byte buffer to be checksummed.

length - how much of the buffer should be checksummed

Returns:

the calculated checksum

checkCrc

public static boolean checkCrc(byte[] data,
 int length)

Verifies a checksum.

Parameters:

data - the data, ending in the 2 byte CRC checksum to verify

length - The length of the data, including the checksum at the end

Returns:

true if the checksum is correct, false if not