io.nem.symbol.core.utils

Class ByteUtils

java.lang.Object

io.nem.symbol.core.utils.ByteUtils

public class ByteUtils
extends java.lang.Object

Method Summary

Modifier and Type	Method and Description
static byte[]	bigIntToByteArrayLeadingZeros(java.math.BigInteger value, int numBytes) Converts a BigInteger to a byte array of the given size leading with zeros.
static byte[]	bigIntToBytes(java.math.BigInteger x) Converts a BigInteger value into an array of 8 bytes.
static byte[]	byteArrayLeadingZeros(byte[] valueByteArray, int numBytes) It completes the byte array to a byte array of the given size leading with zeros.
static int	bytesToInt(byte[] bytes) Converts an array of 4 bytes into a int.
static byte[]	intToBytes(int x) Converts an int value into an array of 4 bytes.
static int	isEqualConstantTime(int b, int c) Constant-time byte comparison.
static int	isNegativeConstantTime(int b) Constant-time check if byte is negative.
static byte[]	longToBytes(long x) Converts a long value into an array of 8 bytes.
static byte[]	shortToBytes(short x) Converts an short value into an array of 4 bytes.
static java.lang.String	toString(byte[] bytes) Creates a human readable representation of an array of bytes.

Methods inherited from class java.lang.Object

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

Method Detail

bigIntToByteArrayLeadingZeros

public static byte[] bigIntToByteArrayLeadingZeros(java.math.BigInteger value,
                                                   int numBytes)

Converts a BigInteger to a byte array of the given size leading with zeros.

Parameters:

value - The value to convert.

numBytes - The number of bytes in the destination array.

Returns:

a byte array of size numBytes

byteArrayLeadingZeros

public static byte[] byteArrayLeadingZeros(byte[] valueByteArray,
                                           int numBytes)

It completes the byte array to a byte array of the given size leading with zeros.

Parameters:

valueByteArray - the source byte array.

numBytes - The number of bytes in the destination array.

Returns:

a byte array of size numBytes

bigIntToBytes

public static byte[] bigIntToBytes(java.math.BigInteger x)

Converts a BigInteger value into an array of 8 bytes.

Parameters:

x - The BigInteger.

Returns:

The bytes.

longToBytes

public static byte[] longToBytes(long x)

Converts a long value into an array of 8 bytes.

Parameters:

x - The long.

Returns:

The bytes.

bytesToInt

public static int bytesToInt(byte[] bytes)

Converts an array of 4 bytes into a int.

Parameters:

bytes - The bytes.

Returns:

The int.

intToBytes

public static byte[] intToBytes(int x)

Converts an int value into an array of 4 bytes.

Parameters:

x - The int.

Returns:

The bytes.

shortToBytes

public static byte[] shortToBytes(short x)

Converts an short value into an array of 4 bytes.

Parameters:

x - The short.

Returns:

The bytes.

isEqualConstantTime

public static int isEqualConstantTime(int b,
                                      int c)

Constant-time byte comparison. The constant time behavior eliminates side channel attacks.

Parameters:

b - One byte.

c - Another byte.

Returns:

1 if b and c are equal, 0 otherwise.

isNegativeConstantTime

public static int isNegativeConstantTime(int b)

Constant-time check if byte is negative. The constant time behavior eliminates side channel attacks.

Parameters:

b - The byte to check.

Returns:

1 if the byte is negative, 0 otherwise.

toString

public static java.lang.String toString(byte[] bytes)

Creates a human readable representation of an array of bytes.

Parameters:

bytes - The bytes.

Returns:

An string representation of the bytes.