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Decode/encode Hex String

08.28.2010
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        // decode/encode hex string

	public static String toHexString(byte[] ba) {
		String hex = "";
		for(int i = 0; i < ba.length; i++)
			hex += zeroPad(Integer.toHexString(ba[i] & 0xFF).toUpperCase(), 2);
		return hex;
		}
	
	public static byte[] fromHexString(String hex) {
		ByteArrayOutputStream bas = new ByteArrayOutputStream();
		for (int i = 0; i < hex.length(); i+=2) {
			int b = Integer.parseInt(hex.substring(i, i + 2), 16);
			bas.write(b);
			}
		return bas.toByteArray();
		}