JAVA工具类-DES加密解密
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2022-03-12 19:20:26
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import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.security.SecureRandom;
/**
* @author yunfeng
* @version V1.0
* @date 2018-06-07 22:13
*/
public class DesUtil {
private final static Logger logger = LoggerFactory.getLogger(DesUtil.class);
/**
* 加密
*
* @param datasource byte[]
* @param password String
* @return byte[]
*/
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("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,ENCRYPT_MODE用于将 Cipher 初始化为加密模式的常量
cipher.init(Cipher.ENCRYPT_MODE, securekey, random);
//现在,获取数据并加密 正式执行加密操作
//按单部分操作加密或解密数据,或者结束一个多部分操作
return cipher.doFinal(datasource);
} catch (Throwable e) {
logger.error("DES 加密异常,详情:" + e.toString());
e.printStackTrace();
}
return null;
}
/**
* 解密
*
* @param src byte[]
* @param password String
* @return byte[]
* @throws Exception
*/
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("DES");//返回实现指定转换的 Cipher 对象
// 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);
}
}