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DES.java
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DES.java
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package Client;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
public class DES {
private SecretKey DESkey; //生成的密钥
//返回密钥为String
public String get_Key()
{
try{
KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
keyGenerator.init(56);
SecretKey secretkey = keyGenerator.generateKey();
byte[] bytesKey = secretkey.getEncoded();
//key转换
DESKeySpec desKeySpec = new DESKeySpec(bytesKey);
SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");
SecretKey convertKey = factory.generateSecret(desKeySpec);
DESkey = convertKey;
}catch(Exception e){
e.printStackTrace();
}
return DESkey.toString();
}
//加密 返回密文为byte[]
public 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("DES");
SecretKey securekey = keyFactory.generateSecret(desKey);
//Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance("DES");
//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;
}
//解密,输入输出格式都为byte[]
public 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("DES");
// 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("DES");
// 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);
}
}