com.isbc.smartcard.esmarttoken.utils

Class HexUtils

java.lang.Object

com.isbc.smartcard.esmarttoken.utils.HexUtils

public class HexUtils
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	HexUtils.DecoderException

Method Summary

Modifier and Type	Method and Description
static byte[]	decodeHex(char[] data) Converts an array of characters representing hexadecimal values into an array of bytes of those same values.
static byte[]	decodeHex(String string) Converts a String or an array of character bytes representing hexadecimal values into an array of bytes of those same values.
static char[]	encodeHex(byte[] data) Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order.
static char[]	encodeHex(byte[] data, boolean toLowerCase) Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order.
protected static char[]	encodeHex(byte[] data, char[] toDigits) Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order.
static String	encodeHexString(byte[] data) Converts an array of bytes into a String representing the hexadecimal values of each byte in order.
protected static int	toDigit(char ch, int index) Converts a hexadecimal character to an integer.

Methods inherited from class java.lang.Object

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

Method Detail

decodeHex

public static byte[] decodeHex(char[] data)
                        throws HexUtils.DecoderException

Converts an array of characters representing hexadecimal values into an array of bytes of those same values. The returned array will be half the length of the passed array, as it takes two characters to represent any given byte. An exception is thrown if the passed char array has an odd number of elements.

Parameters:

data - An array of characters containing hexadecimal digits

Returns:

A byte array containing binary data decoded from the supplied char array.

Throws:

HexUtils.DecoderException - Thrown if an odd number or illegal of characters is supplied

decodeHex

public static byte[] decodeHex(String string)
                        throws HexUtils.DecoderException

Converts a String or an array of character bytes representing hexadecimal values into an array of bytes of those same values. The returned array will be half the length of the passed String or array, as it takes two characters to represent any given byte. An exception is thrown if the passed char array has an odd number of elements.

Parameters:

string - A String or, an array of character bytes containing hexadecimal digits

Returns:

A byte array containing binary data decoded from the supplied byte array (representing characters).

Throws:

HexUtils.DecoderException - Thrown if an odd number of characters is supplied to this function or the object is not a String or char[]

See Also:

decodeHex(char[])

toDigit

protected static int toDigit(char ch,
                             int index)
                      throws HexUtils.DecoderException

Converts a hexadecimal character to an integer.

Parameters:

ch - A character to convert to an integer digit

index - The index of the character in the source

Returns:

An integer

Throws:

HexUtils.DecoderException - Thrown if ch is an illegal hex character

encodeHex

public static char[] encodeHex(byte[] data)

Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order. The returned array will be double the length of the passed array, as it takes two characters to represent any given byte.

Parameters:

data - a byte[] to convert to Hex characters

Returns:

A char[] containing hexadecimal characters

encodeHex

public static char[] encodeHex(byte[] data,
                               boolean toLowerCase)

Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order. The returned array will be double the length of the passed array, as it takes two characters to represent any given byte.

Parameters:

data - a byte[] to convert to Hex characters

toLowerCase - true converts to lowercase, false to uppercase

Returns:

A char[] containing hexadecimal characters

Since:

1.4

encodeHex

protected static char[] encodeHex(byte[] data,
                                  char[] toDigits)

Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order. The returned array will be double the length of the passed array, as it takes two characters to represent any given byte.

Parameters:

data - a byte[] to convert to Hex characters

toDigits - the output alphabet

Returns:

A char[] containing hexadecimal characters

Since:

1.4

encodeHexString

public static String encodeHexString(byte[] data)

Converts an array of bytes into a String representing the hexadecimal values of each byte in order. The returned String will be double the length of the passed array, as it takes two characters to represent any given byte.

Parameters:

data - a byte[] to convert to Hex characters

Returns:

A String containing hexadecimal characters

Since:

1.4