曾今写的一个生成某产品licence脚本

曾今写的一个生成某产品licence脚本。

import javax.crypto.Cipher;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
 * @author Bohr Qiu email: qiuboboy@qq.com
 */

public class Test {
	static byte[] desKeyData = { 83, 69, 67, 77, 2, 33, 64, 35 };
	static byte[] md5KeyData = { 83, 73, 78, 79, 86, 65, 33, 64, 35 };
	static String productName = "eshop";
	static String version = "1.0";
	static String instalDate = "2008-12-31";
	static String ip = "";

	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {

	String key = generateKey("2010-12-03");
	decode("Cki3dFHnV3LeGI9ZGW0nzsykApE43i2WexPXryCOgbw=");
	System.out.println(generatelicense(key));

	}

	public static byte[] Subbytes(byte[] Bytes, int begin, int len) {
		byte[] resutl = new byte[len];
		int n = 0;
		for (int i = begin; i < begin + len; ++n) {
			resutl[n] = Bytes[i];

			++i;
		}

		return resutl;
	}

	// licence的解密过程
	public static void decode(String key) throws Exception {
		BASE64Decoder b64d = new BASE64Decoder();
		byte[] key64 = b64d.decodeBuffer(key);// 对key值进行base64解码
		// 根据des密钥构造新的密钥
		SecretKeySpec secretKey = new SecretKeySpec(desKeyData, "DES");

		// Cipher对象实际完成加密操作
		Cipher cipher = Cipher.getInstance("DES");

		// DECRYPT_MODE=2,为解密模式
		cipher.init(2, secretKey);
		// 正式执行解密操作
		// 这是对key值进行base64解码，然后在用desKeyData生成的密码对解码的结果进行解密
		byte[] decrypted = cipher.doFinal(key64);

		// 对解密的结果取最后10位,这就是到期时间
		String endData = new String(Subbytes(decrypted, decrypted.length - 10,
				10));
		System.out.println("到期时间：" + endData);
		// 对解密的结果取除开最后10位的其他位
		byte[] bCheckMD5 = Subbytes(decrypted, 0, decrypted.length - 10);

		// 构造一个md5密钥
		SecretKeySpec secretKeyMD5 = new SecretKeySpec(md5KeyData, "HmacMD5");
		Mac mac = Mac.getInstance("HmacMD5");
		mac.init(secretKeyMD5);
		String Str = productName + " " + version + " " + ip
				+ new String(md5KeyData) + "     " + instalDate + " " + endData;
		byte[] result = mac.doFinal(Str.getBytes());
		String bCheckMD5Str = new String(bCheckMD5);
		String resultStr = new String(result);
		if (bCheckMD5Str.equals(resultStr)) {
			System.out.println("此license可用");
		} else {
			System.out.println("此licens不可用");
		}
	}

	/**
	 * 生成key
	 *
	 * @param endData
	 *            到期时间 格式为YYYY-MM-DD
	 * @return key
	 * @throws Exception
	 */
	public static String generateKey(String endData) throws Exception {

		SecretKeySpec secretKeyMD5 = new SecretKeySpec(md5KeyData, "HmacMD5");
		Mac mac = Mac.getInstance("HmacMD5");
		mac.init(secretKeyMD5);
		String Str = productName + " " + version + " " + ip
				+ new String(md5KeyData) + "     " + instalDate + " " + endData;
		byte[] result = mac.doFinal(Str.getBytes());
		byte[] tmp = endData.getBytes();
		byte[] re = new byte[tmp.length + result.length];
		for (int i = 0; i < tmp.length + result.length; i++) {
			if (i < result.length) {
				re[i] = result[i];
			} else {
				re[i] = tmp[i - result.length];
			}
		}
		SecretKeySpec secretKey = new SecretKeySpec(desKeyData, "DES");
		Cipher cipher = Cipher.getInstance("DES");

		// DECRYPT_MODE=1,为加密模式
		cipher.init(1, secretKey);
		byte[] decrypted = cipher.doFinal(re);
		BASE64Encoder encode = new BASE64Encoder();

		return encode.encode(decrypted);
	}

	public static String generatelicense(String key) {

		return "--------------------\n" + "Product_NAME=eshop\n"
				+ "Version=1.0\n" + "Install_Date=2008-12-31\n" + "Key=" + key;
	}
}

 这个产品应该没有用了，所以贴出来，如果还在用，请贵公司升级安全机制。