Android AES算法示例

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@SuppressLint("NewApi")     public static String encryptAES(String seed, String cleartext) throws Exception {               byte[] rawKey = getRawKey(seed.getBytes("UTF-8"));               byte[] result = encryptAES(rawKey, cleartext.getBytes("UTF-8"));            return new String(Base64.encode(result, 0));         //return toHex_0(result);           }               private static byte[] encryptAES(byte[] raw, byte[] clear) throws Exception {             SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");             Cipher cipher = Cipher.getInstance("AES");             cipher.init(Cipher.ENCRYPT_MODE, skeySpec);             byte[] encrypted = cipher.doFinal(clear);             return encrypted;        }                      public static String decryptAES(String seed, String encrypted) throws Exception {               byte[] rawKey = getRawKey(seed.getBytes("UTF-8"));           byte[] enc = Base64.decode(encrypted, 0);         //byte[] enc = toByte_0(encrypted);               byte[] result = decryptAES(rawKey, enc);               return new String(result, "UTF-8");           }                 private static byte[] decryptAES(byte[] raw, byte[] encrypted) throws Exception {              SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");              Cipher cipher = Cipher.getInstance("AES");              cipher.init(Cipher.DECRYPT_MODE, skeySpec);              byte[] decrypted = cipher.doFinal(encrypted);              return decrypted;          }           private static byte[] getRawKey(byte[] seed) throws Exception {               KeyGenerator kgen = KeyGenerator.getInstance("AES");               SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");               sr.setSeed(seed);               kgen.init(128, sr); // 192 and 256 bits may not be available               SecretKey skey = kgen.generateKey();               byte[] raw = skey.getEncoded();               return raw;           }

调用方法：

pw = "密钥xxxx"

String miwen = RegisterActivity.encryptAES(pw, yuanwen);

String yuanwen = RegisterActivity.decryptAES(pw, miwen)；

参考：

http://blog.csdn.net/randyjiawenjie/article/details/6587986

http://my.eoe.cn/elvnxuan/archive/2160.html

http://www.iteye.com/problems/35327

个人理解每次加密后密文不一样是正常的，对称加密算法只要密钥一致就行。

用DES加密的时候，最后一位长度不足64的，它会自动填补到64，那么在我们进行字节数组到字串的转化过程中，

可能把它填补的不可见字符改变了，所以引发系统抛出异常。问题找到，怎么解决呢？

大家还记得邮件传输通常会把一些信息编码保存，对了，就是Base64，那样保证了信息的完整性，所以我们就是利用一下下了。

By tiandyoin:

http://write.blog.csdn.net/postedit/23096187

2014年4月7日

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