Package com.yubico.yubikit.core.otp

Class ChecksumUtils

  • public class ChecksumUtils
extends java.lang.Object
    Utility methods for calculating and verifying the CRC13239 checksum used by YubiKeys.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      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 Detail

      • 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