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<li>AES-GCM</li>
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<div class="section" id="aes-gcm">
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<span id="aes-gcm-index"></span><h1>AES-GCM<a class="headerlink" href="#aes-gcm" title="永久链接至标题">¶</a></h1>
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<div class="section" id="id1">
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<h2>总览<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h2>
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<p>AES是一种对称加密算法，它的相关概念在此不赘述，本文档主要介绍AES-GCM的原理和实现。</p>
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<p>GCM ( Galois/Counter Mode) 指的是该对称加密采用Counter模式，并带有GMAC消息认证码。
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在详细介绍AES-GCM之前，我们先了解一些相关概念。</p>
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</div>
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<div class="section" id="ctr-counter">
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<h2>CTR（CounTeR）<a class="headerlink" href="#ctr-counter" title="永久链接至标题">¶</a></h2>
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<blockquote>
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<div><p>在CTR模式下，我们对一个逐次累加的计数器进行加密，用加密后的比特序列与明文分组进行异或得到密文。过程如下图：</p>
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<blockquote>
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<div><div class="figure align-default">
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<img alt="" src="../../_images/image12.png" />
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</div></blockquote>
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</div></blockquote>
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<p>其中， IV为初始化向量，Ek表示ECB文本加密，PT表示输入的明文，CT表示输出的密文。</p>
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<p>在BL602中，我们可以直接使用硬件完成CTR算法，即设置key密钥后，输入IV以及需要加密的明文，硬件会自动完成累加计数加密并输出密文。</p>
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<p>CTR模式的优点是：
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1）支持加解密并行计算，可事先进行加解密准备；
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2）错误密文中的对应比特只会影响明文中的对应比特。
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但是它不能提供密文消息完整性校验的功能。</p>
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</div>
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<div class="section" id="mac-message-authentication-code">
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<h2>MAC（Message Authentication Code）<a class="headerlink" href="#mac-message-authentication-code" title="永久链接至标题">¶</a></h2>
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<p>想要校验消息的完整性，必须引入另一个概念：消息验证码。消息验证码是一种与秘钥相关的单项散列函数，过程如下图所示：</p>
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<blockquote>
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<div><div class="figure align-default">
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<img alt="" src="../../_images/image21.png" />
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</div>
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</div></blockquote>
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<p>密文的收发双发需要提前共享一个秘钥。密文发送者将密文的MAC值随密文一起发送，密文接收者通过共享秘钥计算收到密文的MAC值，
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这样就可以对收到的密文做完整性校验。当篡改者篡改密文后，没有共享秘钥，就无法计算出篡改后的密文的MAC值。</p>
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</div>
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<div class="section" id="gmac-galois-message-authentication-code-mode">
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<h2>GMAC（Galois message authentication code mode）<a class="headerlink" href="#gmac-galois-message-authentication-code-mode" title="永久链接至标题">¶</a></h2>
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<p>对应到上图中的消息认证码，GMAC就是利用伽罗华域(Galois Field，GF，有限域)乘法运算来计算消息的MAC值。
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假设秘钥长度为128bits, 当密文大于128bits时，需要将密文按128bits进行分组。应用流程如下图：</p>
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<blockquote>
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<div><div class="figure align-default">
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<img alt="" src="../../_images/image3.png" />
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</div>
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</div></blockquote>
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<p>其中，msg为需要验证的消息，Mh表示在有限域上做乘法运算，MAC即为生成的验证码。</p>
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<p>在BL602中，我们可以直接使用硬件完成GMAC验证。</p>
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</div>
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<div class="section" id="gcm-galois-counter-mode">
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<h2>GCM（ Galois/Counter Mode )<a class="headerlink" href="#gcm-galois-counter-mode" title="永久链接至标题">¶</a></h2>
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<p>GCM中的G就是指GMAC，C就是指CTR。于是将CTR算法加上GMAC验证就是AES-GCM模式了。过程如下图所示：</p>
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<blockquote>
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<div><div class="figure align-default">
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<img alt="" src="../../_images/image4.png" />
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</div>
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</div></blockquote>
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</div>
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<div class="section" id="id2">
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<h2>具体实现<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
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<p>具体代码实现大体如下图所示：</p>
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<blockquote>
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<div><div class="figure align-default">
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<img alt="" src="../../_images/image5.png" />
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</div>
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</div></blockquote>
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</div>
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</div>
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</div>
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2020-11-08 19:32:47 +00:00
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2020-10-26 12:43:20 +00:00
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</div>
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<footer>
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2020-11-08 19:32:47 +00:00
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2020-10-26 12:43:20 +00:00
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<hr/>
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<div role="contentinfo">
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<p>
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2020-11-08 19:32:47 +00:00
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2020-10-26 12:43:20 +00:00
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© 版权所有 2020, Bouffalo Lab
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</p>
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</div>
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2020-11-08 19:32:47 +00:00
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利用 <a href="http://sphinx-doc.org/">Sphinx</a> 构建，使用了
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2020-10-26 12:43:20 +00:00
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<a href="https://github.com/rtfd/sphinx_rtd_theme">主题</a>
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2020-11-08 19:32:47 +00:00
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由 <a href="https://readthedocs.org">Read the Docs</a>开发.
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2020-10-26 12:43:20 +00:00
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</footer>
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</div>
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</section>
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</div>
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2020-11-08 19:32:47 +00:00
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2020-10-26 12:43:20 +00:00
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<script type="text/javascript">
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jQuery(function () {
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SphinxRtdTheme.Navigation.enable(true);
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2020-11-08 19:32:47 +00:00
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2020-10-26 12:43:20 +00:00
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