Java Utililty Methods Hex to Byte Array

List of utility methods to do Hex to Byte Array

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Description

The list of methods to do Hex to Byte Array are organized into topic(s).

Method

byte[]convertHexAsciiToByteArray(byte[] bytes)
convert Hex Ascii To Byte Array 
return convertHexAsciiToByteArray(bytes, 0, bytes.length);
byte[]convertHEXString2ByteArray(String value)
convert HEX String Byte Array 
if (value == null || value.length() == 0) {
    return null;
} else {
    char[] array = value.toCharArray();
    int ext = array.length % 2; 
    byte[] out = new byte[array.length / 2 + ext];
    for (int i = 0; i < array.length - ext; i += 2) {
        String part = new String(array, i, 2);
...
byte[]convertHexStringToByteArray(String hexString)
convert Hex String To Byte Array 
if ((hexString.length() % 2) != 0) {
    throw new IllegalArgumentException("Invalid hex string (length % 2 != 0)");
byte[] array = new byte[hexString.length() / 2];
for (int i = 0, arrayIndex = 0; i < hexString.length(); i += 2, arrayIndex++) {
    array[arrayIndex] = Integer.valueOf(hexString.substring(i, i + 2), 16).byteValue();
return array;
...
byte[]convertHexStringToByteArray(String s)
convert Hex String To Byte Array 
s = s.replace(" 0x", "");
s = s.replace(":0x", "");
s = s.replace(" ", "");
s = s.replace(":", "");
final int len = s.length();
final int rem = len % 2;
byte[] ret = new byte[len / 2 + rem];
if (rem != 0) {
...
byte[]convertHexStringToByteArray(String str, int numBytes, int numCharsPerByte)
Convert raw memory data to byte array 
if (str.length() == 0)
    return null;
StringBuffer buf = new StringBuffer(str);
int requiredPadding = numBytes * numCharsPerByte - str.length();
while (requiredPadding > 0) {
    buf.insert(0, "0"); 
    requiredPadding--;
byte[] bytes = new byte[numBytes];
str = buf.toString();
for (int i = 0; i < bytes.length; i++) {
    String oneByte = str.substring(i * 2, i * 2 + 2);
    Integer number = Integer.valueOf(oneByte, 16);
    if (number.compareTo(Integer.valueOf(Byte.toString(Byte.MAX_VALUE))) > 0) {
        int temp = number.intValue();
        temp = temp - 256;
        String tempStr = Integer.toString(temp);
        Byte myByte = Byte.valueOf(tempStr);
        bytes[i] = myByte.byteValue();
    } else {
        Byte myByte = Byte.valueOf(oneByte, 16);
        bytes[i] = myByte.byteValue();
return bytes;
byte[]convertHexStringToByteNoSpace(String s)
convert Hex String To Byte No Space 
int len = s.length();
byte[] ret = new byte[len >>> 1];
for (int i = 0; i <= len - 2; i += 2) {
    ret[i >>> 1] = (byte) (Integer.parseInt(s.substring(i, i + 2).trim(), 16) & 0xFF);
return ret;
byte[]convertHexStringToBytes(String hex)
Converts a hexadecimal String (such as one generated by the #convertBytesToHexString(byte[]) method) into an array of bytes. 
if (hex.length() % 2 != 0) {
    throw new IllegalArgumentException("Hex string must have even number of characters.");
byte[] seed = new byte[hex.length() / 2];
for (int i = 0; i < seed.length; i++) {
    int index = i * 2;
    seed[i] = (byte) Integer.parseInt(hex.substring(index, index + 2), 16);
return seed;
byte[]convertHexStringToBytes(String hex)
Converts the specified hex string to a byte array. 
int len = hex.length() / 2;
byte[] buf = new byte[len];
for (int i = 0; i < len; i++) {
    buf[i] = (byte) Integer.parseInt(hex.substring(i * 2, i * 2 + 2), 16);
return buf;
byte[]convertHexToByteArray(String hexString)
convert Hex To Byte Array 
if ((hexString.length() % 2) != 0) {
    throw new IllegalArgumentException();
byte[] result = new byte[hexString.length() / 2];
char[] enc = hexString.toCharArray();
for (int i = 0; i < enc.length; i += 2) {
    StringBuilder curr = new StringBuilder(2);
    curr.append(enc[i]).append(enc[i + 1]);
...
byte[]convertHexToBytes(String s)
Convert a hex encoded string to a byte array. 
int len = s.length();
if (len % 2 != 0) {
    throw new RuntimeException("HEX_STRING_ODD:" + s);
len /= 2;
byte[] buff = new byte[len];
int mask = 0;
int[] hex = HEX_DECODE;
...