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Sqlite3加密方案
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2016-01-17
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<h2 id="Sqlite3"><a href="#Sqlite3" class="headerlink" title="Sqlite3"></a>Sqlite3</h2><blockquote>
<p>开源版的Sqlite3是不支持加密功能的，对于一个保存在本地的数据库来说没有加密功能让人难以接受。所幸Sqlite3的作者留下了加密接口，而互联网上也有很多高人提供了他们的加密方案，其中有收费的，也有免费的。<br>这里选择了一个免费的加密方案<code>SQLCipher</code>，不过该方案没有直接提供编译好的库，只是提供了源代码，而且编译略麻烦，如果你不想自己编译，就只能花500美刀向作者购买编译好的库。吾辈屌丝只能望洋兴叹了，只能自己动手丰衣足食。</p>
</blockquote>
<h2 id="u7F16_u8BD1SQLCipher"><a href="#u7F16_u8BD1SQLCipher" class="headerlink" title="编译SQLCipher"></a>编译SQLCipher</h2><p>在本项目中没有直接使用二进制库（lib或者dll），而是直接将源代码集成到项目中，毕竟sqlite3的源代码就只有一个.c文件和一个头文件。<br>SQLCipher提供了一个方法，用于将SQLCipher的加密代码加到sqlite3的源码上从而生成一个”联合文件(amalgamation file)”，最后将生成的文件加到项目里就好了。</p>
<blockquote>
<p>./configure –enable-tempstore=yes CFLAGS=”-DSQLITE_HAS_CODEC”<br>make sqlite3.c</p>
</blockquote>
<p>执行上述两个命令就能生成以下几个文件：</p>
<ul>
<li>sqlite3.h</li>
<li>sqlite3.c</li>
<li>sqlite3ext.h</li>
<li>shell.c ——生成客户端工具的代码文件，我们用不到这个文件</li>
</ul>
<p>以上命令都是在Ubuntu环境下执行的，Windows环境也能编译但需要额外安装MSYS2之类的*unix模拟器。</p>
<p><strong>注意:</strong><br>SQLCipher库的加密功能有openssl提供，所以首先编译环境需要安装openssl，Ubuntu已经默认安装了。<br>但编译SQLCipher还需要用到libssl-dev库，Ubuntu环境下可以用下面的命令安装</p>
<blockquote>
<p>sudo apt-get install libssl-dev</p>
</blockquote>
<p>另外，在将代码合入到工程中时，别忘了加上<code>SQLITE_HAS_CODEC</code>和<code>SQLITE_TEMP_STORE=2</code>这两个宏</p>
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