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

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internal package of Alachisoft.

There is a newer version: 5.3.3

package com.alachisoft.ncache.ncactivate.license;

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

import java.util.Date;
import java.util.Random;

/*
 * NCCrypto.java
 *
 * Created on September 28, 2006, 10:37 AM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

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

    /**
     * Creates a new instance of NCCrypto
     */
    public NCCrypto() {
    }

    static void Scramble(ByteRef dataPtr, int dwSize, int offset) {
        Date dte = new Date();
        Random rnd = new Random(dte.getTime());
        for (int i = 0, j = offset; i < dwSize; i++, j++) {
            dataPtr.data[j] = (byte) rnd.nextInt();
        }
    }

    public static void Scramble(byte[] dataPtr, int dwSize) {
        Date dte = new Date();
        Random rnd = new Random(dte.getTime());
        for (int i = 0; i < dwSize; i++) {
            dataPtr[i] = (byte) rnd.nextInt();
        }
    }

    // Simple XOR-based symmetric encryption/decryption function.
    public static void EncryptDecryptBytes(ByteRef pBytes, long nCount, int nOffset) {
        char xorVal = (char) 141;
        for (int i = 0, j = nOffset; i < nCount; i++, j++) {
            xorVal = (char) (((xorVal << (i % 1)) ^ (i * i * 17)) % 256);
            pBytes.data[j] ^= xorVal;
        }
    }

    public static String EDecode(StringRef ptr) {
        int dlen = ebase64.decode(ptr, null) + 1;
        char[] dBuf = new char[dlen];
        StringRef dBuf2 = new StringRef();
        dBuf2.strData = new String(dBuf);
        ebase64.decode(ptr, dBuf2);
        String res = dBuf2.strData;
        return res;
    }
}