[JS]DES加密封装和DES解密封装

DES加密封装

package org.jtool.desutils;
import java.security.SecureRandom;
import javax.crypto.*;
import javax.crypto.spec.DESKeySpec;
public class DESEncrypt {
private byte[] desKey;
public DESEncrypt(byte[] desKey) {
this.desKey = desKey;
}
public byte[] doEncrypt(byte[] plainText) throws Exception {
// DES算法要求有一个可信任的随机数源
SecureRandom sr = new SecureRandom();
byte rawKeyData[] = desKey;/* 用某种方法获得密匙数据 */
// 从原始密匙数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(rawKeyData);
// 创建一个密匙工厂，然后用它把DESKeySpec转换成
// 一个SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey key = keyFactory.generateSecret(dks);
// 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, key, sr);
// 现在，获取数据并加密
byte data[] = plainText;/* 用某种方法获取数据 */
// 正式执行加密操作
byte encryptedData[] = cipher.doFinal(data);
return encryptedData;
}
}