由于项目的优化改进，用到AES+RSA加密传输数据。于是，在网上摘录了网友们的AES算法，如下：
**public static byte**[] encrypt(**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 byte**[] decrypt(**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;
  }

  **public 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);
      SecretKey skey = kgen.generateKey();
      **byte**[] raw = skey.getEncoded();
      **return **raw;
  }

一切正常的在Android 4.3-6.1的手机上加解密，但是我用 *LGE Nexus 5X (7.1.1 API 25)*上发现在Android N上 google去掉了**Crypto **provider，意味着我们将不能继续像上面那样对数据加密填充。当然，在studio里的Logcat里会提示前往关于Android N对Crypto的解决方案：

http://Android-developers.blogspot.com/2016/06/security-crypto-provider-deprecated-in.html

解决方案：

`<span class="typ">SecureRandom</span><span class="pln"> sr </span><span class="pun">=</span> <span class="typ">SecureRandom</span><span class="pun">.</span><span class="pln">getInstance</span><span class="pun">(</span><span class="str">"SHA1PRNG"</span><span class="pun">,</span> <span class="kwd">new</span> <span class="typ">CryptoProvider</span><span class="pun">());</span>`

代替

`<span class="typ">SecureRandom</span><span class="pln"> sr </span><span class="pun">=</span> <span class="typ">SecureRandom</span><span class="pun">.</span><span class="pln">getInstance</span><span class="pun">(</span><span class="str">"SHA1PRNG"</span><span class="pun">,</span><span class="str">"Crypto"</span><span class="pun">);</span>`
**[java]** [view plain](http://blog.csdn.net/mazhidong/article/details/71189396#) [copy](http://blog.csdn.net/mazhidong/article/details/71189396#)
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- <span class="keyword">import</span> java.security.Provider;

- <span class="comment">/**</span>

- <span class="comment"> * Implementation of Provider for SecureRandom. The implementation     supports the</span>

- <span class="comment"> * &#8220;SHA1PRNG&#8221; algorithm described in JavaTM Cryptography Architecture, API</span>

- <span class="comment"> * Specification & Reference</span>

- <span class="comment">*/</span>

- <span class="keyword">public</span> <span class="keyword">final</span> <span class="keyword">class</span> CryptoProvider <span class="keyword">extends</span> Provider {

- <span class="comment">/**</span>

- <span class="comment"> * Creates a Provider and puts parameters</span>

- <span class="comment"> */</span>

- <span class="keyword">public</span> CryptoProvider() {

- <span class="keyword">super</span>(<span class="string">&#8220;Crypto&#8221;</span>, <span class="number">1.0</span>, <span class="string">&#8220;HARMONY (SHA1 digest; SecureRandom; SHA1withDSA signature)&#8221;</span>);

- put(<span class="string">&#8220;SecureRandom.SHA1PRNG&#8221;</span>,

- <span class="string">&#8220;org.apache.harmony.security.provider.crypto.SHA1PRNG_SecureRandomImpl&#8221;</span>);

- put(<span class="string">&#8220;SecureRandom.SHA1PRNG ImplementedIn&#8221;</span>, <span class="string">&#8220;Software&#8221;</span>);

- }

- }

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