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<small><time class="date dt-published" datetime="2022-10-08T00:00:00+08:00">8 October 2022</time> - 字数统计1699 - 阅读大约需要6分钟 - Hits: <span id="/2022/10/08/tinyaes.html" class="visitors">Loading...</span></small>
<h1 class="p-name">用Python写一个超简单的加密程序</h1>
<p class="view">by <a class="p-author h-card" href="//github.com/Mabbs">mayx</a></p>
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<b>AI摘要</b>
<p id="ai-output">这篇文章介绍了一种使用Python编写的简单加密程序作者发现TinyAES库非常适合对数据进行AES-128-CTR加密因为其加密和解密方法一致使用起来非常直观。作者通过导入MD5哈希来处理非16位长度的密码然后举例编写了一个加密脚本用户只需提供文件路径和密钥即可执行加密或解密。这种库相比于复杂的加密库如pycryptodome或cryptography被作者认为更符合Python的简洁性和易用性。</p>
<hr />
<ul><li><a href="#起因">起因</a></li><li><a href="#探索">探索</a></li><li><a href="#使用方法">使用方法</a></li><li><a href="#示例">示例</a></li><li><a href="#感想">感想</a></li></ul>
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<main class="post-content e-content" role="main"><p>有些冷门的库也许更容易解决问题<!--more--></p>
<h1 id="起因">
<a href="#起因"><svg class='octicon' viewBox='0 0 16 16' version='1.1' width='16' height='32' aria-hidden='true'><path fill-rule='evenodd' d='M7.775 3.275a.75.75 0 001.06 1.06l1.25-1.25a2 2 0 112.83 2.83l-2.5 2.5a2 2 0 01-2.83 0 .75.75 0 00-1.06 1.06 3.5 3.5 0 004.95 0l2.5-2.5a3.5 3.5 0 00-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 010-2.83l2.5-2.5a2 2 0 012.83 0 .75.75 0 001.06-1.06 3.5 3.5 0 00-4.95 0l-2.5 2.5a3.5 3.5 0 004.95 4.95l1.25-1.25a.75.75 0 00-1.06-1.06l-1.25 1.25a2 2 0 01-2.83 0z'></path></svg></a> 起因
</h1>
<p>最近在写Python脚本的时候遇到一个问题就是怎么样轻松的加密一串字符。在网上随便一搜大都是介绍的使用比如pycryptodome或者cryptography库进行加密我以前写的一个<a href="/2020/06/13/encrypt.html">加密传输Demo</a>作业的时候就用过。不过现在总感觉看着很难受倒不是说有多复杂主要是这些库的算法太多了什么AESRSA啥的都有而且还有一堆乱七八糟的参数我用的时候还要去思考到底用哪个算法比较好还要考虑有些有什么向量之类乱七八糟的。但是很多时候我只是单纯要个加密不想去考虑这些乱七八糟的东西那我应该怎么做比较好呢</p>
<h1 id="探索">
<a href="#探索"><svg class='octicon' viewBox='0 0 16 16' version='1.1' width='16' height='32' aria-hidden='true'><path fill-rule='evenodd' d='M7.775 3.275a.75.75 0 001.06 1.06l1.25-1.25a2 2 0 112.83 2.83l-2.5 2.5a2 2 0 01-2.83 0 .75.75 0 00-1.06 1.06 3.5 3.5 0 004.95 0l2.5-2.5a3.5 3.5 0 00-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 010-2.83l2.5-2.5a2 2 0 012.83 0 .75.75 0 001.06-1.06 3.5 3.5 0 00-4.95 0l-2.5 2.5a3.5 3.5 0 004.95 4.95l1.25-1.25a.75.75 0 00-1.06-1.06l-1.25 1.25a2 2 0 01-2.83 0z'></path></svg></a> 探索
</h1>
<p>这时候我想起来我以前用的Pyinstaller库如果想要使用Key参数的时候会要求安装一个叫做<a href="https://pypi.org/project/tinyaes/">tinyaes</a>的库我搜了一下这个库网上几乎没有对这个库的介绍没办法就只好去Github找找它<a href="https://github.com/naufraghi/tinyaes-py">源代码的仓库</a>。去看了一眼说了跟没说一样就几句话连个示例也没有的……不过大概意思就是C也有个叫<a href="https://github.com/kokke/tiny-AES-c">tiny-AES-c</a>的库它是在Python上对这个库做的一个简单的包装但那个仓库里面也没有示例😂……还好tinyaes仓库里面有个测试脚本我看了一眼又回去看了看C的库那个文档结合“Same function for encrypting as for decrypting in CTR mode”这句话我才明白这个tinyaes原来就用一个方法就能进行加解密了怪不得叫“xcrypt”就像xor加密那样用同样的方法就可以做到加密和解密这个仓库加密的算法是AES-128-CTR这样我也不用费心考虑到底选什么加密算法了使用也非常简单非常的符合我的需求啊可惜就是这个库不怎么出名100个⭐都不到。</p>
<h1 id="使用方法">
<a href="#使用方法"><svg class='octicon' viewBox='0 0 16 16' version='1.1' width='16' height='32' aria-hidden='true'><path fill-rule='evenodd' d='M7.775 3.275a.75.75 0 001.06 1.06l1.25-1.25a2 2 0 112.83 2.83l-2.5 2.5a2 2 0 01-2.83 0 .75.75 0 00-1.06 1.06 3.5 3.5 0 004.95 0l2.5-2.5a3.5 3.5 0 00-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 010-2.83l2.5-2.5a2 2 0 012.83 0 .75.75 0 001.06-1.06 3.5 3.5 0 00-4.95 0l-2.5 2.5a3.5 3.5 0 004.95 4.95l1.25-1.25a.75.75 0 00-1.06-1.06l-1.25 1.25a2 2 0 01-2.83 0z'></path></svg></a> 使用方法
</h1>
<p>tinyaes的使用方法非常简单一句话就可以搞定而且加密和解密的代码完全一致</p>
<div class="language-python highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nb">__import__</span><span class="p">(</span><span class="s">"tinyaes"</span><span class="p">).</span><span class="n">AES</span><span class="p">(</span><span class="sa">b</span><span class="s">"十六位的密码"</span><span class="p">,</span> <span class="sa">b</span><span class="s">"十六位的向量,可以不要"</span><span class="p">).</span><span class="n">CTR_xcrypt_buffer</span><span class="p">(</span><span class="sa">b</span><span class="s">"需要加密/解密的内容"</span><span class="p">)</span>
</code></pre></div></div>
<p>使用起来非常的简单啊就是密码要求必须是16位的……那我要是想要一个随意位数的密码怎么办呢我想起来MD5的hash长度好像就是16位的所以如果想要其他位数的密码就用MD5哈希之后再用吧。</p>
<h1 id="示例">
<a href="#示例"><svg class='octicon' viewBox='0 0 16 16' version='1.1' width='16' height='32' aria-hidden='true'><path fill-rule='evenodd' d='M7.775 3.275a.75.75 0 001.06 1.06l1.25-1.25a2 2 0 112.83 2.83l-2.5 2.5a2 2 0 01-2.83 0 .75.75 0 00-1.06 1.06 3.5 3.5 0 004.95 0l2.5-2.5a3.5 3.5 0 00-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 010-2.83l2.5-2.5a2 2 0 012.83 0 .75.75 0 001.06-1.06 3.5 3.5 0 00-4.95 0l-2.5 2.5a3.5 3.5 0 004.95 4.95l1.25-1.25a.75.75 0 00-1.06-1.06l-1.25 1.25a2 2 0 01-2.83 0z'></path></svg></a> 示例
</h1>
<p>既然使用方法如此简单我估摸了一下如果写一个加密文件的小程序估计用不了10行用其他的加密库我估计应该做不到吧所以说就随手写了一个试试看果然不到10行就写了出来看起来非常不错。</p>
<div class="language-python highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kn">import</span> <span class="nn">hashlib</span><span class="p">,</span> <span class="n">tinyaes</span><span class="p">,</span> <span class="n">sys</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">len</span><span class="p">(</span><span class="n">sys</span><span class="p">.</span><span class="n">argv</span><span class="p">)</span> <span class="o">==</span> <span class="mi">3</span><span class="p">:</span>
<span class="nb">exit</span><span class="p">(</span><span class="sa">f</span><span class="s">"Usage: </span><span class="si">{</span><span class="n">sys</span><span class="p">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="si">}</span><span class="s"> [filepath] [key]"</span><span class="p">)</span>
<span class="n">key</span> <span class="o">=</span> <span class="n">tinyaes</span><span class="p">.</span><span class="n">AES</span><span class="p">(</span><span class="n">hashlib</span><span class="p">.</span><span class="n">md5</span><span class="p">(</span><span class="n">sys</span><span class="p">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">2</span><span class="p">].</span><span class="n">encode</span><span class="p">()).</span><span class="n">digest</span><span class="p">())</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">sys</span><span class="p">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="s">'rb'</span><span class="p">)</span> <span class="k">as</span> <span class="n">orig</span><span class="p">:</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">sys</span><span class="p">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">+</span> <span class="s">".xc"</span><span class="p">,</span> <span class="s">'wb'</span><span class="p">)</span> <span class="k">as</span> <span class="n">enc</span><span class="p">:</span>
<span class="k">for</span> <span class="n">byte_block</span> <span class="ow">in</span> <span class="nb">iter</span><span class="p">(</span><span class="k">lambda</span><span class="p">:</span> <span class="n">orig</span><span class="p">.</span><span class="n">read</span><span class="p">(</span><span class="mi">4096</span><span class="p">),</span> <span class="sa">b</span><span class="s">''</span><span class="p">):</span>
<span class="n">enc</span><span class="p">.</span><span class="n">write</span><span class="p">(</span><span class="n">key</span><span class="p">.</span><span class="n">CTR_xcrypt_buffer</span><span class="p">(</span><span class="n">byte_block</span><span class="p">))</span>
</code></pre></div></div>
<p>用法很简单比如我给这个脚本起名叫“encrypt_file.py”我想加密就可以直接输入<code class="language-plaintext highlighter-rouge">python3 encrypt_file.py 要加密的文件.txt 密码</code>就可以了,执行完之后会生成一个“.xc”为后缀的文件解密也一样输入<code class="language-plaintext highlighter-rouge">python3 encrypt_file.py 要加密的文件.txt.xc 密码</code>就OK了不过因为我这个程序并不能判断一个文件有没有加密所以解密的时候就会给后缀再加一个“.xc”这时候就只能手动把它去掉了。如果密码不正确那就相当于二次加密了解密就要按顺序依次反过来执行很有意思。</p>
<h1 id="感想">
<a href="#感想"><svg class='octicon' viewBox='0 0 16 16' version='1.1' width='16' height='32' aria-hidden='true'><path fill-rule='evenodd' d='M7.775 3.275a.75.75 0 001.06 1.06l1.25-1.25a2 2 0 112.83 2.83l-2.5 2.5a2 2 0 01-2.83 0 .75.75 0 00-1.06 1.06 3.5 3.5 0 004.95 0l2.5-2.5a3.5 3.5 0 00-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 010-2.83l2.5-2.5a2 2 0 012.83 0 .75.75 0 001.06-1.06 3.5 3.5 0 00-4.95 0l-2.5 2.5a3.5 3.5 0 004.95 4.95l1.25-1.25a.75.75 0 00-1.06-1.06l-1.25 1.25a2 2 0 01-2.83 0z'></path></svg></a> 感想
</h1>
<p>这样的库我感觉更符合Pythonic用什么pycryptodome或者cryptography库写的就感觉像是Java程序那样臃肿这种程序感觉就很直观不用考虑那么多奇怪的东西。</p></main>
<small style="display: block">tags: <a rel="category tag" class="p-category" href="/search.html?keyword=Python"><em>Python</em></a> - <a rel="category tag" class="p-category" href="/search.html?keyword=%E5%8A%A0%E5%AF%86"><em>加密</em></a> <span style="float: right;"><a href="https://gitlab.com/mayx/mayx.gitlab.io/tree/master/_posts/2022-10-08-tinyaes.md">查看原始文件</a></span></small>
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