com.alachisoft.ncache.ncactivate.license.ebase64 Maven / Gradle / Ivy

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internal package of Alachisoft.

There is a newer version: 5.3.3

/*
 * ebase64.java
 *
 * Created on October 17, 2006, 12:14 AM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package com.alachisoft.ncache.ncactivate.license;

import com.alachisoft.ncache.ncactivate.utils.StringRef;

/**
 * @author Administrator
 */
public class ebase64 {

    /**
     * Creates a new instance of ebase64
     */
    public static nbase64 _parent = new nbase64();

    public ebase64() {
    }

    public static String encode(StringRef parr, int ncount) // This one is the external interface
    {
        if (ncount == 0) return null;
        if (parr == null) return null;
        if (parr.strData.length() == 0) return null;

        encrypt(parr, ncount);
        return _parent.encode(parr, ncount);
    }

    public static int decode(StringRef str, StringRef parr) {
        if (parr == null) return _parent.decode(str, null);
        int i;
        i = _parent.decode(str, parr);
        if (i != 0) {
            decrypt(parr, i);
        }
        return i;
    }


    protected static void encrypt(StringRef parr1, int ncount) {
        if (ncount == 0) return;
        if (parr1 == null) return;
        if (parr1.strData.length() == 0) return;

        char[] parr2 = parr1.strData.toCharArray();
        char ch, ch1, ch2;
        for (int i = 0; i < ncount; i++) {
            ch = parr1.strData.charAt(i);
            ch ^= (((0x33 + i) % 254) + 1);
            ch1 = (char) (ch & 0xf);
            ch2 = (char) ((ch >> 4) & 0xf);
            parr2[i] = (char) ((ch1 << 4) | ch2);
        }
        parr1.strData = new String(parr2);
    }

    protected static void decrypt(StringRef parr1, int ncount) {
        if (ncount == 0) return;
        if (parr1 == null) return;
        if (parr1.strData.length() == 0) return;

        char[] parr2 = parr1.strData.toCharArray();
        char ch, ch1, ch2;
        for (int i = 0; i < ncount; i++) {
            ch = parr1.strData.charAt(i);
            ch1 = (char) (ch & 0xf);
            ch2 = (char) ((ch >> 4) & 0xf);
            ch = (char) ((ch1 << 4) | ch2);
            parr2[i] = (char) (ch ^ (((0x33 + i) % 254) + 1));
        }
        parr1.strData = new String(parr2);
    }
}