public static byte[] hex2Byte(String str, int byteLength) {
byte[] second = hex2Byte(str);
if (second.length >= byteLength) {
return second;
}
// New Java arrays are zeroed:
// http://docs.oracle.com/javase/specs/jls/se7/html/jls-4.html#jls-4.12.5
byte[] first = new byte[byteLength - second.length];
return Utils.concatAll(first, second);
}
