ByteHexUtil.java

package com.demigodsrpg.util.misc;

public class ByteHexUtil {
    private final static char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray();

    private ByteHexUtil() {
    }

    public static String byteArrayToHexString(byte[] b) {
        char[] hexChars = new char[b.length * 2];
        for (int j = 0; j < b.length; j++) {
            int v = b[j] & 0xFF;
            hexChars[j * 2] = HEX_ARRAY[v >>> 4];
            hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F];
        }
        return new String(hexChars);
    }

    public static byte[] hexStringToByteArray(String s) {
        int len = s.length();
        byte[] data = new byte[len / 2];
        for (int i = 0; i < len; i += 2)
            data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));
        return data;
    }
}