iaik.security.pq.util

Class ByteConversions

java.lang.Object

iaik.security.pq.util.ByteConversions

public class ByteConversions
extends Object

Utility class for ByteConversions for internal use

Method Summary

Modifier and Type	Method and Description
static int[]	byteArrayToIntArray(byte[] src) Converts a byte array to an int array.
static void	byteArrayToIntArray(int[] out, byte[] src) Converts a byte array to an int array.
static int	bytesToInt(byte[] bytes) Converts a byte array into an integer value.
static long	bytesToLong(byte[] src, int offset, int length) Converts bytes to a long value.
static byte[]	concatByteArrays(byte[]... bytes)
static byte[]	flattenByteArrays(byte[][] arr)
static byte[]	getBytesFromLong(long in)
static int[]	getIntArrayFromBytes(byte[] bytes, int lengthOfIntInBits) Fetches integers from the provided byte array.
static int[]	getIntArrayFromBytes(byte[] bytes, int lengthOfIntInBits, boolean littleEndian) Fetches integers from the provided byte array.
static long	getLongFromBytes(byte[] b)
static byte[]	intArrayToByteArray(int[] src) Converts an integer array to a byte array.
static void	intToBytes(byte[] dest, int offset, int value) Converts an int value to bytes.
static byte[]	intToBytesLittleEndian(int src) Converts an int value in big endian representation to bytes in little endian representation.
static int	littleToBigEndian(int input) Converts an int value in big endian to little endian representation.
static void	longToBytes(byte[] dest, int offset, int length, long value) Converts a long value to bytes.
static byte[]	shortArrayToByteArray(int[] src) Converts a short array to a byte array.

Methods inherited from class java.lang.Object

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

Method Detail

getIntArrayFromBytes

public static int[] getIntArrayFromBytes(byte[] bytes,
                                         int lengthOfIntInBits)

Fetches integers from the provided byte array. The algorithm interprets the source byte array as little endian. For big endian, see getIntArrayFromBytes(byte[], int, boolean).

Parameters:

bytes - the source byte array

lengthOfIntInBits - the length of the integers in bit

Returns:

an array of integers. The array contains bytes.length / (lengthOfIntBits / 8) integers.

Throws:

InvalidParameterException - if the length of bytes does not math with the requested bit length

getIntArrayFromBytes

public static int[] getIntArrayFromBytes(byte[] bytes,
                                         int lengthOfIntInBits,
                                         boolean littleEndian)

Fetches integers from the provided byte array.

Parameters:

bytes - the source byte array

lengthOfIntInBits - the length of the integers in bit

littleEndian - iff true, then the algorithm interprets the byte array as little endian. Big endian otherwise.

Returns:

an array of integers. The array contains bytes.length / (lengthOfIntBits / 8) integers.

Throws:

InvalidParameterException - if the length of bytes does not math with the requested bit length

getBytesFromLong

public static byte[] getBytesFromLong(long in)

getLongFromBytes

public static long getLongFromBytes(byte[] b)

flattenByteArrays

public static byte[] flattenByteArrays(byte[][] arr)

concatByteArrays

public static byte[] concatByteArrays(byte[]... bytes)

longToBytes

public static void longToBytes(byte[] dest,
                               int offset,
                               int length,
                               long value)

Converts a long value to bytes.

Parameters:

dest - byte array

offset - offset

length - length

value - long value

intToBytes

public static void intToBytes(byte[] dest,
                              int offset,
                              int value)

Converts an int value to bytes.

Parameters:

dest - byte array

offset - offset

value - long value

intToBytesLittleEndian

public static byte[] intToBytesLittleEndian(int src)

Converts an int value in big endian representation to bytes in little endian representation.

Parameters:

src - input returns bytes in little endian representation

littleToBigEndian

public static int littleToBigEndian(int input)

Converts an int value in big endian to little endian representation.

Parameters:

input - input integer in big endian representation returns integer in little endian representation

bytesToInt

public static int bytesToInt(byte[] bytes)

Converts a byte array into an integer value.

Parameters:

bytes - input byte array

Returns:

integer value

bytesToLong

public static long bytesToLong(byte[] src,
                               int offset,
                               int length)

Converts bytes to a long value.

Parameters:

src - byte array

offset - offset

length - length

Returns:

long value

intArrayToByteArray

public static byte[] intArrayToByteArray(int[] src)

Converts an integer array to a byte array.

Parameters:

src - byte array

Returns:

byte array

shortArrayToByteArray

public static byte[] shortArrayToByteArray(int[] src)

Converts a short array to a byte array.

Parameters:

src - byte array

Returns:

byte array

byteArrayToIntArray

public static int[] byteArrayToIntArray(byte[] src)

Converts a byte array to an int array.

Parameters:

src - byte array

Returns:

int array

byteArrayToIntArray

public static void byteArrayToIntArray(int[] out,
                                       byte[] src)

Converts a byte array to an int array.

Parameters:

out - destination array where the integer values will be written to

src - source byte array