byte to hex

private static String getHexSeed(boolean isLowerCase)
    {
        String seed = null;
        if (isLowerCase)
        {
            seed = "0123456789abcdef";
        }
        else
        {
            seed = "0123456789ABCDEF";
        }

        return seed;
    }

    public static String byte2Hex(byte b, boolean isLowerCase)
    {
        String seed = getHexSeed(isLowerCase);
        return "" + seed.charAt(0xf & b >> 4) + seed.charAt(0xf & b);
    }

    public static byte hex2Byte(String str, boolean isLowerCase)
    {
        String seed = getHexSeed(isLowerCase);
        return (byte) (seed.indexOf(str.substring(0, 1)) * 16 + seed
                .indexOf(str.substring(1, 2)));
    }
public static String bytes2HexString(byte[] bytes, boolean isLowerCase)
    {
        String result = "";
        for (int i = 0; i < bytes.length; i++)
        {
            result += byte2Hex(bytes[i], isLowerCase);
        }
        return result;
    }

    public static byte[] hexString2Bytes(String str, boolean isLowerCase)
    {
        byte[] b = new byte[str.length() / 2];
        for (int i = 0; i < b.length; i++)
        {
            String s = str.substring(i * 2, i * 2 + 2);
            b[i] = hex2Byte(s, isLowerCase);
        }
        return b;
    }