Java Utililty Methods Hex to String

StringBuffer sb = new StringBuffer();
char[] myBuffer = inStr.toCharArray();
for (int i = 0; i < inStr.length(); i++) {
    short s = (short) myBuffer[i];
    String hexS = Integer.toHexString(s).toUpperCase();
    if (hexS.length() == 8) {
        sb.append("&#x" + hexS.substring(4) + ";");
    } else {
...

byte digest[] = new byte[ss.length() / 2];
for (int i = 0; i < digest.length; i++) {
    String byteString = ss.substring(2 * i, 2 * i + 2);
    int byteValue = Integer.parseInt(byteString, 16);
    digest[i] = (byte) byteValue;
return digest;

String uHexString = hexString.toLowerCase();
StringBuffer sBuf = new StringBuffer();
for (int i = 0; i < uHexString.length(); i = i + 2) {
    char c = (char) Integer.parseInt(uHexString.substring(i, i + 2), 16);
    sBuf.append(c);
return sBuf.toString();

StringBuilder sb = new StringBuilder();
StringBuilder temp = new StringBuilder();
for (int i = 0; i < hex.length() - 1; i += 2) {
    String output = hex.substring(i, (i + 2));
    int decimal = Integer.parseInt(output, 16);
    sb.append((char) decimal);
    temp.append(decimal);
return sb.toString();

if (buf == null)
    return NullString;
try (StringWriter sw = new StringWriter()) {
    formatHexToWriter(buf, sw, 0);
    return sw.toString();
} catch (Exception e) {
    return NullString;

StringWriter w = new StringWriter();
for (byte b : data) {
    w.append(padLeft(Integer.toHexString(b), 2, '0'));
return w.toString();

formatHexToWriter(buf, writer, 48, actualLength);
return;