/**
 * This method converts a set of bytes into a Hexadecimal representation.
 * 
 * @param buf
 * @return
 */
 public String convertBytesToHex(byte[] buf) {
	StringBuffer strBuf = new StringBuffer();

	for (int i = 0; i < buf.length; i++) {
		int byteValue = (int) buf[i] & 0xff;
		if (byteValue <= 15) {
			strBuf.append("0");
		}
		strBuf.append(Integer.toString(byteValue, 16));
	}
	return strBuf.toString();
}


/**
 * This method converts a specified hexadecimal String into a set of bytes.
 * 
 * @param hexString
 * @return
 */
public byte[] convertHexToBytes(String hexString) {
	int size = hexString.length();
	byte[] buf = new byte[size / 2];

	int j = 0;
	for (int i = 0; i < size; i++) {
		String a = hexString.substring(i, i + 2);
		int valA = Integer.parseInt(a, 16);

		i++;

		buf[j] = (byte) valA;
		j++;
	}

	return buf;
}