de.flexiprovider.pqc.hbc.gmss
Class GMSSUtilities

java.lang.Object
  |
  +--de.flexiprovider.pqc.hbc.gmss.GMSSUtilities

public class GMSSUtilities

extends java.lang.Object

This class provides several methods that are required by the GMSS classes.

Author:

Elena Klintsevich

Constructor Summary

GMSSUtilities()

Method Summary

int	bytesToIntLittleEndian(byte[] bytes) Converts a byte array beginning at offset into a 32 bit integer (little-endian representation)
int	bytesToIntLittleEndian(byte[] bytes, int offset) Converts a byte array beginning at offset into a 32 bit integer (little-endian representation)
byte[]	concatenateArray(byte[][] arraycp) This method concatenates a 2-dimensional byte array into a 1-dimensional byte array
int	getLog(int intValue) This method returns the least integer that is greater or equal to the logarithm to the base 2 of an integer intValue.
byte[]	intToBytesLittleEndian(int value) Converts a 32 bit integer into a byte array beginning at offset (little-endian representation)
void	printArray(java.lang.String text, byte[] array) This method prints the values of a 1-dimensional byte array
void	printArray(java.lang.String text, byte[][] array) This method prints the values of a 2-dimensional byte array
boolean	testPowerOfTwo(int testValue) This method tests if an integer is a power of 2.

Methods inherited from class java.lang.Object

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

Constructor Detail

GMSSUtilities

public GMSSUtilities()

Method Detail

intToBytesLittleEndian

public byte[] intToBytesLittleEndian(int value)

Converts a 32 bit integer into a byte array beginning at offset (little-endian representation)

Parameters:

value - the integer to convert

bytesToIntLittleEndian

public int bytesToIntLittleEndian(byte[] bytes)

Converts a byte array beginning at offset into a 32 bit integer (little-endian representation)

Parameters:

bytes - the byte array

Returns:

The resulting integer

bytesToIntLittleEndian

public int bytesToIntLittleEndian(byte[] bytes,
                                  int offset)

Converts a byte array beginning at offset into a 32 bit integer (little-endian representation)

Parameters:

bytes - the byte array

offset - the integer offset into the byte array

Returns:

The resulting integer

concatenateArray

public byte[] concatenateArray(byte[][] arraycp)

This method concatenates a 2-dimensional byte array into a 1-dimensional byte array

Parameters:

arraycp - a 2-dimensional byte array.

Returns:

1-dimensional byte array with concatenated input array

printArray

public void printArray(java.lang.String text,
                       byte[][] array)

This method prints the values of a 2-dimensional byte array

Parameters:

text - a String

array - a 2-dimensional byte array

printArray

public void printArray(java.lang.String text,
                       byte[] array)

This method prints the values of a 1-dimensional byte array

Parameters:

text - a String

array - a 1-dimensional byte array.

testPowerOfTwo

public boolean testPowerOfTwo(int testValue)

This method tests if an integer is a power of 2.

Parameters:

testValue - an integer

Returns:

TRUE if testValue is a power of 2, FALSE otherwise

getLog

public int getLog(int intValue)

This method returns the least integer that is greater or equal to the logarithm to the base 2 of an integer intValue.

Parameters:

intValue - an integer

Returns:

The least integer greater or equal to the logarithm to the base 2 of intValue