对称加密-java实现

标签：byte[]类型finalinitrate工厂genini填充转换

主要步骤如下：

1.利用SecretKeyFactory.getInstance(\”加密算法\”)创建密钥工厂，加密算法如\”DES\”,\”AES\”等

2.用new DESKeySpec(原始密钥)产生密钥对象，原始密钥是byte[]类型的

3.用密钥工厂的generateSecret(密钥对象)方法把密钥对象转换成规范的密钥对象

4.用new SecureRandom()或者用new IvParameterSpec(向量)生成一个可信任的随机数源

5.用Cipher.getInstance(“加密算法/加密模式/填充模式”)产生加密解密对象

6.用cipher.init(加密解密模型，规范密钥，随机数)初始化加密解密对象

7.用cipher.doFinal(数据)执行加密解密操作

代码如下：

1 //加密
2 private byte[] desEncrypt(byte[] data, byte[] key) throws Exception {
3 SecureRandom sr = new SecureRandom();
4 DESKeySpec dks = new DESKeySpec(key);
5 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(\”DES\”);
6 SecretKey securekey = keyFactory.generateSecret(dks);
7 Cipher cipher = Cipher.getInstance(\”DES\”);
8 cipher.init(1, securekey, sr);
9 return cipher.doFinal(data);
10 }
11 //解密
12 private byte[] desDecrypt(byte[] data, byte[] key) throws Exception {
13 SecureRandom sr = new SecureRandom();
14 DESKeySpec dks = new DESKeySpec(key);
15 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(\”DES\”);
16 SecretKey securekey = keyFactory.generateSecret(dks);
17 Cipher cipher = Cipher.getInstance(\”DES\”);
18 cipher.init(2, securekey, sr);
19 return cipher.doFinal(data);
20 }

对称加密-java实现

标签：byte[]类型finalinitrate工厂genini填充转换

原文地址：http://www.cnblogs.com/zhima-hu/p/7637436.html