DES算法解密

心已赠人 2022-02-28 03:44 257阅读 0赞

import java.security.SecureRandom;  
import javax.crypto.spec.DESKeySpec;  
import javax.crypto.SecretKeyFactory;  
import javax.crypto.SecretKey;  
import javax.crypto.Cipher;

public class ResolveDESC \{  
public ResolveDESC() \{  
\}  
//测试  
public static void main(String args\[\]) \{  
//待加密内容  
String str = "测试内容";  
//密码，长度要是8的倍数  
String password = "9588153628958212570743325311898426347857298773549468758875018579537757772163084478873699447306034466200616411960574122434059469100235892702736860872901247123456";  
  
byte\[\] result = ResolveDESC.encrypt(str.getBytes(),password);  
System.out.println("加密后："+new String(result));  
//直接将如上内容解密  
try \{  
byte\[\] decryResult = ResolveDESC.decrypt(result, password);  
System.out.println("解密后："+new String(decryResult));  
\} catch (Exception e1) \{  
e1.printStackTrace();  
\}  
\}

public static byte\[\] encrypt(byte\[\] datasource, String password) \{  
try\{  
SecureRandom random = new SecureRandom();  
DESKeySpec desKey = new DESKeySpec(password.getBytes());  
//创建一个密匙工厂，然后用它把DESKeySpec转换成  
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("ResolveDESC");  
SecretKey securekey = keyFactory.generateSecret(desKey);  
//Cipher对象实际完成加密操作  
Cipher cipher = Cipher.getInstance("ResolveDESC");  
//用密匙初始化Cipher对象  
cipher.init(Cipher.ENCRYPT\_MODE, securekey, random);  
//现在，获取数据并加密  
//正式执行加密操作  
return cipher.doFinal(datasource);  
\}catch(Throwable e)\{  
e.printStackTrace();  
\}  
return null;  
\}  
public static byte\[\] decrypt(byte\[\] src, String password) throws Exception \{  
// DES算法要求有一个可信任的随机数源  
SecureRandom random = new SecureRandom();  
// 创建一个DESKeySpec对象  
DESKeySpec desKey = new DESKeySpec(password.getBytes());  
// 创建一个密匙工厂  
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("ResolveDESC");  
// 将DESKeySpec对象转换成SecretKey对象  
SecretKey securekey = keyFactory.generateSecret(desKey);  
// Cipher对象实际完成解密操作  
Cipher cipher = Cipher.getInstance("ResolveDESC");  
// 用密匙初始化Cipher对象  
cipher.init(Cipher.DECRYPT\_MODE, securekey, random);  
// 真正开始解密操作  
return cipher.doFinal(src);  
\}  
\}