关于加密还原问题，急待！！！!

[opet_zhu]

public static String encrypt(String password)
{
char c1[] = password.toCharArray();

for (int i = 0; i < password.length(); i++)
{
c1[i] = (char) (i + c1[i]);
}

return new String(c1);
}

public static void main(String[] args) {
System.out.println(encrypt("opet123456"));
// 输出为：oqgw579;=?

}

现在我想写个函数，传入"oqgw579;=?" 输出为：opet123456
请大侠们帮我看看。写个函数。谢谢

[anykcry]

除非你找他们之间的规律，，否则很难还原

[xinyiben]

这规律很简单，楼主用下面的方法还原，看来楼主没把加密过程看明白

public static String decrypt(String encryptPass){
		char c1[] = encryptPass.toCharArray();
		for(int i = 0; i < encryptPass.length(); i++){
			c1[i] = (char) (c1[i] - i);
		}
		return new String(c1);
		
	}

[孤独剑客]

建议LZ, 现在又很多加密和解密工具, 而且比较好用
自己写的话安全性不高, 而且也有难度, 为何不是用开源的呢?

[closewbq]

一起在项目中使用过个加密的工具类，你看看吧

package sarnath.book.util;

/**
 * 类功能:数据的加密和解密
 * 做成者:wubq
 */

import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class DesEncryptUtil{
	private Key key;

	public DesEncryptUtil() {
		this.getKey("jiangfeng");
	}

	/**
	 * 根据参数生成KEY
	 * 
	 * @param strKey
	 */
	public void getKey(String strKey) {
		try {
			KeyGenerator _generator = KeyGenerator.getInstance("DES");
			_generator.init(new SecureRandom(strKey.getBytes()));
			this.key = _generator.generateKey();
			_generator = null;
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 加密String明文输入,String密文输出
	 * 
	 * @param strMing
	 * @return
	 */
	public String getEncString(String strMing) {
		byte[] byteMi = null;
		byte[] byteMing = null;
		String strMi = "";
		BASE64Encoder base64en = new BASE64Encoder();
		try {
			byteMing = strMing.getBytes("UTF-8");
			byteMi = this.getEncCode(byteMing);
			strMi = base64en.encode(byteMi);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			base64en = null;
			byteMing = null;
			byteMi = null;
		}
		return strMi;
	}

	/**
	 * 解密 以String密文输入,String明文输出
	 * 
	 * @param strMi
	 * @return
	 */
	public String getDesString(String strMi) {
		BASE64Decoder base64De = new BASE64Decoder();
		byte[] byteMing = null;
		byte[] byteMi = null;
		String strMing = "";
		try {
			byteMi = base64De.decodeBuffer(strMi);
			byteMing = this.getDesCode(byteMi);
			strMing = new String(byteMing, "UTF-8");
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			base64De = null;
			byteMing = null;
			byteMi = null;
		}
		return strMing;
	}

	/**
	 * 加密以byte[]明文输入,byte[]密文输出
	 * 
	 * @param byteS
	 * @return
	 */
	private byte[] getEncCode(byte[] byteS) {
		byte[] byteFina = null;
		Cipher cipher;
		try {
			cipher = Cipher.getInstance("DES");
			cipher.init(Cipher.ENCRYPT_MODE, key);
			byteFina = cipher.doFinal(byteS);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			cipher = null;
		}
		return byteFina;
	}

	/**
	 * 解密以byte[]密文输入,以byte[]明文输出
	 * 
	 * @param byteD
	 * @return
	 */
	private byte[] getDesCode(byte[] byteD) {
		Cipher cipher;
		byte[] byteFina = null;
		try {
			cipher = Cipher.getInstance("DES");
			cipher.init(Cipher.DECRYPT_MODE, key);
			byteFina = cipher.doFinal(byteD);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			cipher = null;
		}
		return byteFina;
	}
	
	public static void main(String args[]) {
		DesEncryptUtil des = new DesEncryptUtil();
		// 实例化一个对像
		String strEnc = des
				.getEncString("1");
		//加密字符串,返回String的密文
		System.out.println("加密文:" + strEnc);
		String strDes = des.getDesString(strEnc);// 把String 类型的密文解密
		System.out.println("解密文:" + strDes);
	}
}