使用DES加密解密-优快云博客

本文介绍了一种使用DES算法进行数据加密和解密的方法。通过具体的Java代码实现了DES密钥的生成、加密过程及解密过程，并展示了如何利用BASE64进行编码与解码。

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===================使用DES进行加密和解密============================

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.security.SecureRandom;

/**
* 功能: DES加密
*/
private String encrypt(String key, String source){
  String algorithm = "DES";
  byte [] cipherByte   = null;

  try {
   DESKeySpec dks = new DESKeySpec(key.getBytes());
   SecureRandom sr = new SecureRandom();
   SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(algorithm);
   SecretKey securekey = keyFactory.generateSecret(dks);
   Cipher c1 = Cipher.getInstance(algorithm);
   c1.init(Cipher.ENCRYPT_MODE, securekey, sr);
   cipherByte = c1.doFinal(source.getBytes());
  } catch (Exception e) {
   e.printStackTrace();
  }
  BASE64Encoder base64encoder = new BASE64Encoder();
  String encode=base64encoder.encode(cipherByte);
  return encode;
}
/**
* 功能: DES解密
* @param key
* @param source
* @return
*/
private String decrypt(String key, String source){
  String algorithm = "DES";
  SecureRandom sr = new SecureRandom();
  String result   = null;
  try {
   DESKeySpec dks = new DESKeySpec(key.getBytes());
         SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(algorithm);
         SecretKey securekey = keyFactory.generateSecret(dks);
         Cipher cipher = Cipher.getInstance(algorithm);
         cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
         BASE64Decoder base64decoder = new BASE64Decoder();
         byte[] encodeByte = base64decoder.decodeBuffer(source);
         byte[] cipherByte = cipher.doFinal(encodeByte);
         result = new String(cipherByte, "GBK");
  } catch (Exception e){
   e.printStackTrace();
  }
        return result;
}

DES加密与解密