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<small><time class="date dt-published" datetime="2020-06-13T00:00:00+08:00">13 June 2020</time> - 字数统计：6457 - 阅读大约需要22分钟 - Hits: <span id="/2020/06/13/encrypt.html" class="visitors">Loading...</span></small>
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<h1 class="p-name">加密传输Demo V2</h1>
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<p class="view">by <a class="p-author h-card" href="//github.com/Mabbs">mayx</a></p>
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<div id="outdate" style="display:none;">
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<hr /><p>
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这是一篇创建于 <span id="outime"></span> 天前的文章，其中的信息可能已经有所发展或是发生改变。
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<b>AI摘要</b>
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<p id="ai-output">这篇文章描述了一个加密传输Demo的升级版本，原作者在上月制作了一个简单的单向加密通信Demo，但觉得其业余且安全性不足。因此，作者决定改进它，实现完整的握手过程，以确保双向通信并提高防中间人攻击的能力。实现方法是通过RSA加密一个随机数作为AES密钥，密钥在连接建立后保持不变。作者还增加了防止冲突的机制，并在Demo中加入了简单的登录系统，允许自动化操作。代码展示了通信过程中的密钥交换、数据加密和解密的实现。</p>
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<hr />
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<ul><li><a href="#前言">前言</a></li><li><a href="#实现思路">实现思路</a></li><li><a href="#代码">代码</a><ul><li><a href="#serverpy">server.py</a></li><li><a href="#clientpy">client.py</a></li></ul></li><li><a href="#后记">后记</a></li></ul>
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<main class="post-content e-content" role="main"><p>太业余总感觉不太好啊<!--more--></p>
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<h1 id="前言">
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<a href="#前言"><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> 前言
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</h1>
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<p>在上个月我写了一个<a href="/2020/05/29/encrypt.html">加密传输的Demo</a>，相当的业余，这个东西只能做到从客户端向服务端的单向传输，而且因为只有一次请求，所以中间人攻击也非常的容易。 </p><p>
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虽然我觉得那个应该足够我完成作业了，但是我想了想，太业余总显得我很菜 <del>（难道不是吗？）</del> ，所以我打算还是努力一下把完整的握手也做出来吧。</p>
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<h1 id="实现思路">
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<a href="#实现思路"><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> 实现思路
|
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</h1>
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<p>和上次差不多，同样我打算通过RSA加密一个随机数作为AES的密钥，但是和上次不同，这次的这个密钥将在通信建立之后密钥就不再变化，传入传出都是这个密钥。 </p><p>
|
||||
之前觉得握手阶段可能很麻烦，不过我画了一下图稍微理了理思路发现其实也没多复杂，也就是客户端生成密钥然后加密传输过来让服务端保存，完成之后之间的传输只要传被加密的数据就行了。这样我觉得应该也能起到一定的防止中间人攻击的作用吧…… </p><p>
|
||||
不过我只用了一个文件作为传输的管道，为了避免冲突，我在每次写入数据的时候也都标明了数据的来源，这样就不会因为自己刚发完然后自己又重新接收自己发的东西了。 </p><p>
|
||||
另外老师希望我的Demo有个简单的应用，所以我又另外加了一个极其简单的登录系统在里面，这样我就不用手动操作服务端了。</p>
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<h1 id="代码">
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<a href="#代码"><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> 代码
|
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|
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</h1>
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|
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<h2 id="serverpy">
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||||
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<a href="#serverpy"><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> server.py
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|
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|
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</h2>
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<div class="language-python highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1"># -*- coding: utf-8 -*-
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</span><span class="k">print</span><span class="p">(</span><span class="s">"加密通道服务端演示开始"</span><span class="p">)</span>
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<span class="kn">from</span> <span class="nn">Crypto.PublicKey</span> <span class="kn">import</span> <span class="n">RSA</span>
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<span class="kn">from</span> <span class="nn">Crypto.Cipher</span> <span class="kn">import</span> <span class="n">PKCS1_v1_5</span>
|
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<span class="kn">from</span> <span class="nn">Crypto.Cipher</span> <span class="kn">import</span> <span class="n">AES</span>
|
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<span class="kn">import</span> <span class="nn">base64</span>
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<span class="kn">import</span> <span class="nn">hashlib</span>
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||||
<span class="kn">import</span> <span class="nn">json</span>
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<span class="kn">import</span> <span class="nn">time</span>
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|
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<span class="n">private_key</span> <span class="o">=</span> <span class="s">"""-----BEGIN RSA PRIVATE KEY-----
|
||||
MIICXQIBAAKBgQDfEQ82qUrto7h4BL3TsA/DFXSdM44cbeY4kPccD7gLGhaZRClz
|
||||
YKIh5zYdfjBGF+0HXfMa1u9b7GNs2AjVIsx8Kx0QLnMfmtkmGWGhOXz/9IDLKJOx
|
||||
0weKv61gysKItgzVKn2mbLool4R/PQBc3AjDyHw+io1KpVz+3kRTaGs1fQIDAQAB
|
||||
AoGAWB4kFWLA/6k6OOcemd4mC9mQ7HyuOdrMJDJX+5TWDkSrArajbTmSMrRkczgj
|
||||
F71h3BQn8cVQXs695ARfUNrjTbi2Y0LjN7ScK7ExzTLdoMEFw5JsHggJZ0zBQY6w
|
||||
mwOdGfqzA6tZPXgkn+jqEha+CD6GrwnTM1oDGJC/aKG2OmECQQDkO9IhUhFc/PSU
|
||||
0zvGE6AOcqk5wlOuvMg+oAFHJHJZ9XW7+X/Nx0ZoVDFq/cZQj+46t+fiwUwhdW7l
|
||||
IfCvNGKFAkEA+jRQmWGKrbf1ns4S0SezJvysd5O6otRGJXr+Ex2uDhc39ZTeUsyg
|
||||
kjrLhp8STLMOmql+8g5fghct17EuCX1EmQJBAJz9BNnEkIrst/OSpH/nyeWGOx6u
|
||||
q077LaXd+2MLD9kO/O/Se3V5B9YFa4STkJCjoBMloswXd51gIGpdgSeSmd0CQQCL
|
||||
PrwwcGmWfo+ynqs4PajlpK9zKQMwhYS4bTejedwZOXDKOtx0Ji+i0hfcxwCPMQOK
|
||||
rZPZsIgUxUOdC508aLvZAkBDkHxunCzDm0w4DdTUN7S9YSpVvQEjK/xUQiWaKV12
|
||||
8QgskhU2DNdYK2NxifnWrKtx3uQmqMxX5aLuJZ4493yr
|
||||
-----END RSA PRIVATE KEY-----"""</span>
|
||||
|
||||
<span class="c1"># 公钥解密
|
||||
</span><span class="k">def</span> <span class="nf">rsa_decode</span><span class="p">(</span><span class="n">cipher_text</span><span class="p">,</span> <span class="n">private_key</span><span class="p">):</span>
|
||||
<span class="n">rsakey</span> <span class="o">=</span> <span class="n">RSA</span><span class="p">.</span><span class="n">importKey</span><span class="p">(</span><span class="n">private_key</span><span class="p">)</span> <span class="c1"># 导入读取到的私钥
|
||||
</span> <span class="n">cipher</span> <span class="o">=</span> <span class="n">PKCS1_v1_5</span><span class="p">.</span><span class="n">new</span><span class="p">(</span><span class="n">rsakey</span><span class="p">)</span> <span class="c1"># 生成对象
|
||||
</span> <span class="c1"># 将密文解密成明文，返回的是一个bytes类型数据，需要自己转换成str
|
||||
</span> <span class="n">text</span> <span class="o">=</span> <span class="n">cipher</span><span class="p">.</span><span class="n">decrypt</span><span class="p">(</span><span class="n">base64</span><span class="p">.</span><span class="n">b64decode</span><span class="p">(</span><span class="n">cipher_text</span><span class="p">),</span> <span class="s">"ERROR"</span><span class="p">)</span>
|
||||
<span class="k">return</span> <span class="n">text</span><span class="p">.</span><span class="n">decode</span><span class="p">()</span>
|
||||
|
||||
<span class="k">class</span> <span class="nc">PrpCrypt</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
|
||||
|
||||
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">):</span>
|
||||
<span class="bp">self</span><span class="p">.</span><span class="n">key</span> <span class="o">=</span> <span class="n">key</span><span class="p">.</span><span class="n">encode</span><span class="p">(</span><span class="s">'utf-8'</span><span class="p">)</span>
|
||||
<span class="bp">self</span><span class="p">.</span><span class="n">mode</span> <span class="o">=</span> <span class="n">AES</span><span class="p">.</span><span class="n">MODE_CBC</span>
|
||||
|
||||
<span class="k">def</span> <span class="nf">encrypt</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">text</span><span class="p">):</span>
|
||||
<span class="n">text</span> <span class="o">=</span> <span class="n">text</span><span class="p">.</span><span class="n">encode</span><span class="p">(</span><span class="s">'utf-8'</span><span class="p">)</span>
|
||||
<span class="n">cryptor</span> <span class="o">=</span> <span class="n">AES</span><span class="p">.</span><span class="n">new</span><span class="p">(</span><span class="bp">self</span><span class="p">.</span><span class="n">key</span><span class="p">,</span> <span class="bp">self</span><span class="p">.</span><span class="n">mode</span><span class="p">,</span> <span class="sa">b</span><span class="s">'0000000000000000'</span><span class="p">)</span>
|
||||
<span class="c1"># 这里密钥key 长度必须为16（AES-128）,
|
||||
</span> <span class="c1"># 24（AES-192）,或者32 （AES-256）Bytes 长度
|
||||
</span> <span class="c1"># 目前AES-128 足够目前使用
|
||||
</span> <span class="n">length</span> <span class="o">=</span> <span class="mi">16</span>
|
||||
<span class="n">count</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">text</span><span class="p">)</span>
|
||||
<span class="k">if</span> <span class="n">count</span> <span class="o"><</span> <span class="n">length</span><span class="p">:</span>
|
||||
<span class="n">add</span> <span class="o">=</span> <span class="p">(</span><span class="n">length</span> <span class="o">-</span> <span class="n">count</span><span class="p">)</span>
|
||||
<span class="c1"># \0 backspace
|
||||
</span> <span class="c1"># text = text + ('\0' * add)
|
||||
</span> <span class="n">text</span> <span class="o">=</span> <span class="n">text</span> <span class="o">+</span> <span class="p">(</span><span class="s">'</span><span class="se">\0</span><span class="s">'</span> <span class="o">*</span> <span class="n">add</span><span class="p">).</span><span class="n">encode</span><span class="p">(</span><span class="s">'utf-8'</span><span class="p">)</span>
|
||||
<span class="k">elif</span> <span class="n">count</span> <span class="o">></span> <span class="n">length</span><span class="p">:</span>
|
||||
<span class="n">add</span> <span class="o">=</span> <span class="p">(</span><span class="n">length</span> <span class="o">-</span> <span class="p">(</span><span class="n">count</span> <span class="o">%</span> <span class="n">length</span><span class="p">))</span>
|
||||
<span class="c1"># text = text + ('\0' * add)
|
||||
</span> <span class="n">text</span> <span class="o">=</span> <span class="n">text</span> <span class="o">+</span> <span class="p">(</span><span class="s">'</span><span class="se">\0</span><span class="s">'</span> <span class="o">*</span> <span class="n">add</span><span class="p">).</span><span class="n">encode</span><span class="p">(</span><span class="s">'utf-8'</span><span class="p">)</span>
|
||||
<span class="bp">self</span><span class="p">.</span><span class="n">ciphertext</span> <span class="o">=</span> <span class="n">cryptor</span><span class="p">.</span><span class="n">encrypt</span><span class="p">(</span><span class="n">text</span><span class="p">)</span>
|
||||
<span class="c1"># 因为AES加密时候得到的字符串不一定是ascii字符集的，输出到终端或者保存时候可能存在问题
|
||||
</span> <span class="c1"># 所以这里统一把加密后的字符串转化为16进制字符串
|
||||
</span> <span class="k">return</span> <span class="n">base64</span><span class="p">.</span><span class="n">b64encode</span><span class="p">(</span><span class="bp">self</span><span class="p">.</span><span class="n">ciphertext</span><span class="p">)</span>
|
||||
|
||||
<span class="c1"># 解密后，去掉补足的空格用strip() 去掉
|
||||
</span> <span class="k">def</span> <span class="nf">decrypt</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">text</span><span class="p">):</span>
|
||||
<span class="n">cryptor</span> <span class="o">=</span> <span class="n">AES</span><span class="p">.</span><span class="n">new</span><span class="p">(</span><span class="bp">self</span><span class="p">.</span><span class="n">key</span><span class="p">,</span> <span class="bp">self</span><span class="p">.</span><span class="n">mode</span><span class="p">,</span> <span class="sa">b</span><span class="s">'0000000000000000'</span><span class="p">)</span>
|
||||
<span class="n">plain_text</span> <span class="o">=</span> <span class="n">cryptor</span><span class="p">.</span><span class="n">decrypt</span><span class="p">(</span><span class="n">base64</span><span class="p">.</span><span class="n">b64decode</span><span class="p">(</span><span class="n">text</span><span class="p">))</span>
|
||||
<span class="c1"># return plain_text.rstrip('\0')
|
||||
</span> <span class="k">return</span> <span class="nb">bytes</span><span class="p">.</span><span class="n">decode</span><span class="p">(</span><span class="n">plain_text</span><span class="p">).</span><span class="n">rstrip</span><span class="p">(</span><span class="s">'</span><span class="se">\0</span><span class="s">'</span><span class="p">)</span>
|
||||
|
||||
<span class="c1">#初始化pipe
|
||||
</span><span class="nb">file</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s">'pipe.txt'</span><span class="p">,</span><span class="s">'w'</span><span class="p">)</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="s">""</span><span class="p">,</span><span class="nb">file</span> <span class="o">=</span> <span class="nb">file</span><span class="p">)</span>
|
||||
<span class="nb">file</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="c1">#协商密钥
|
||||
</span><span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
|
||||
<span class="n">pipe</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s">"pipe.txt"</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="s">'r'</span><span class="p">)</span>
|
||||
<span class="n">data</span> <span class="o">=</span> <span class="n">pipe</span><span class="p">.</span><span class="n">read</span><span class="p">()</span>
|
||||
<span class="k">if</span> <span class="ow">not</span> <span class="n">data</span> <span class="o">==</span> <span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">:</span>
|
||||
<span class="n">data</span> <span class="o">=</span> <span class="n">json</span><span class="p">.</span><span class="n">loads</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
|
||||
<span class="n">pipe</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="k">break</span>
|
||||
<span class="n">pipe</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="n">time</span><span class="p">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
|
||||
<span class="nb">file</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s">'pipe.txt'</span><span class="p">,</span><span class="s">'w'</span><span class="p">)</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="s">""</span><span class="p">,</span><span class="nb">file</span> <span class="o">=</span> <span class="nb">file</span><span class="p">)</span>
|
||||
<span class="nb">file</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="n">key</span> <span class="o">=</span> <span class="n">rsa_decode</span><span class="p">(</span><span class="n">data</span><span class="p">[</span><span class="s">"key"</span><span class="p">],</span> <span class="n">private_key</span><span class="p">)</span>
|
||||
<span class="n">akey</span> <span class="o">=</span> <span class="n">PrpCrypt</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="s">"成功获取密钥"</span><span class="p">,</span><span class="n">key</span><span class="p">)</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="s">"已建立连接"</span><span class="p">)</span>
|
||||
<span class="n">userInfo</span><span class="o">=</span><span class="p">{</span><span class="s">"Name"</span><span class="p">:</span><span class="s">"Mayx"</span><span class="p">,</span><span class="s">"Passwd"</span><span class="p">:</span><span class="s">'25d55ad283aa400af464c76d713c07ad'</span><span class="p">,</span><span class="s">"Book"</span><span class="p">:</span><span class="s">"《会说话就多说点》，《在哪里能买到您的著作》"</span><span class="p">}</span>
|
||||
|
||||
<span class="c1">#处理阶段
|
||||
#Waiting for Quest
|
||||
</span><span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
|
||||
<span class="n">pipe</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s">"pipe.txt"</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="s">'r'</span><span class="p">)</span>
|
||||
<span class="n">data</span> <span class="o">=</span> <span class="n">pipe</span><span class="p">.</span><span class="n">read</span><span class="p">()</span>
|
||||
<span class="k">if</span> <span class="ow">not</span> <span class="n">data</span> <span class="o">==</span> <span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">:</span>
|
||||
<span class="n">data</span> <span class="o">=</span> <span class="n">json</span><span class="p">.</span><span class="n">loads</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
|
||||
<span class="k">if</span> <span class="n">data</span><span class="p">[</span><span class="s">"from"</span><span class="p">]</span> <span class="o">==</span> <span class="s">"Client"</span><span class="p">:</span>
|
||||
<span class="n">pipe</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="k">break</span>
|
||||
<span class="n">pipe</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="n">time</span><span class="p">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="s">"已收到请求"</span><span class="p">)</span>
|
||||
<span class="n">data</span> <span class="o">=</span> <span class="n">json</span><span class="p">.</span><span class="n">loads</span><span class="p">(</span><span class="n">akey</span><span class="p">.</span><span class="n">decrypt</span><span class="p">(</span><span class="n">data</span><span class="p">[</span><span class="s">"data"</span><span class="p">]))</span>
|
||||
<span class="k">if</span> <span class="n">data</span><span class="p">[</span><span class="s">"name"</span><span class="p">]</span> <span class="o">==</span> <span class="n">userInfo</span><span class="p">[</span><span class="s">"Name"</span><span class="p">]</span> <span class="ow">and</span> <span class="n">data</span><span class="p">[</span><span class="s">"pwd"</span><span class="p">]</span> <span class="o">==</span> <span class="n">userInfo</span><span class="p">[</span><span class="s">"Passwd"</span><span class="p">]:</span>
|
||||
<span class="nb">file</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s">'pipe.txt'</span><span class="p">,</span><span class="s">'w'</span><span class="p">)</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="n">json</span><span class="p">.</span><span class="n">dumps</span><span class="p">({</span><span class="s">"from"</span><span class="p">:</span><span class="s">"Server"</span><span class="p">,</span><span class="s">"data"</span><span class="p">:</span><span class="n">akey</span><span class="p">.</span><span class="n">encrypt</span><span class="p">(</span><span class="s">"登录成功，您的书单如下："</span><span class="o">+</span><span class="n">userInfo</span><span class="p">[</span><span class="s">"Book"</span><span class="p">]).</span><span class="n">decode</span><span class="p">(</span><span class="s">"utf-8"</span><span class="p">)}),</span><span class="nb">file</span> <span class="o">=</span> <span class="nb">file</span><span class="p">)</span>
|
||||
<span class="nb">file</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="k">else</span><span class="p">:</span>
|
||||
<span class="nb">file</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s">'pipe.txt'</span><span class="p">,</span><span class="s">'w'</span><span class="p">)</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="n">json</span><span class="p">.</span><span class="n">dumps</span><span class="p">({</span><span class="s">"from"</span><span class="p">:</span><span class="s">"Server"</span><span class="p">,</span><span class="s">"data"</span><span class="p">:</span><span class="n">akey</span><span class="p">.</span><span class="n">encrypt</span><span class="p">(</span><span class="s">"登录失败"</span><span class="p">).</span><span class="n">decode</span><span class="p">(</span><span class="s">"utf-8"</span><span class="p">)}),</span><span class="nb">file</span> <span class="o">=</span> <span class="nb">file</span><span class="p">)</span>
|
||||
<span class="nb">file</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="s">"请求已回应"</span><span class="p">)</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="s">"加密通道服务端演示结束"</span><span class="p">)</span>
|
||||
</code></pre></div></div>
|
||||
<h2 id="clientpy">
|
||||
|
||||
|
||||
<a href="#clientpy"><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> client.py
|
||||
|
||||
|
||||
</h2>
|
||||
|
||||
<div class="language-python highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1"># -*- coding: utf-8 -*-
|
||||
</span><span class="k">print</span><span class="p">(</span><span class="s">"加密通道客户端演示开始"</span><span class="p">)</span>
|
||||
<span class="kn">import</span> <span class="nn">random</span>
|
||||
<span class="kn">from</span> <span class="nn">Crypto.PublicKey</span> <span class="kn">import</span> <span class="n">RSA</span>
|
||||
<span class="kn">from</span> <span class="nn">Crypto.Cipher</span> <span class="kn">import</span> <span class="n">PKCS1_v1_5</span>
|
||||
<span class="kn">from</span> <span class="nn">Crypto.Cipher</span> <span class="kn">import</span> <span class="n">AES</span>
|
||||
<span class="kn">import</span> <span class="nn">base64</span>
|
||||
<span class="kn">import</span> <span class="nn">hashlib</span>
|
||||
<span class="kn">import</span> <span class="nn">json</span>
|
||||
<span class="kn">import</span> <span class="nn">time</span>
|
||||
|
||||
<span class="n">public_key</span> <span class="o">=</span> <span class="s">"""-----BEGIN PUBLIC KEY-----
|
||||
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDfEQ82qUrto7h4BL3TsA/DFXSd
|
||||
M44cbeY4kPccD7gLGhaZRClzYKIh5zYdfjBGF+0HXfMa1u9b7GNs2AjVIsx8Kx0Q
|
||||
LnMfmtkmGWGhOXz/9IDLKJOx0weKv61gysKItgzVKn2mbLool4R/PQBc3AjDyHw+
|
||||
io1KpVz+3kRTaGs1fQIDAQAB
|
||||
-----END PUBLIC KEY-----
|
||||
"""</span>
|
||||
|
||||
<span class="c1"># 公钥加密
|
||||
</span><span class="k">def</span> <span class="nf">rsa_encode</span><span class="p">(</span><span class="n">message</span><span class="p">,</span> <span class="n">public_key</span><span class="p">):</span>
|
||||
<span class="n">rsakey</span> <span class="o">=</span> <span class="n">RSA</span><span class="p">.</span><span class="n">importKey</span><span class="p">(</span><span class="n">public_key</span><span class="p">)</span> <span class="c1"># 导入读取到的公钥
|
||||
</span> <span class="n">cipher</span> <span class="o">=</span> <span class="n">PKCS1_v1_5</span><span class="p">.</span><span class="n">new</span><span class="p">(</span><span class="n">rsakey</span><span class="p">)</span> <span class="c1"># 生成对象
|
||||
</span> <span class="c1"># 通过生成的对象加密message明文，注意，在python3中加密的数据必须是bytes类型的数据，不能是str类型的数据
|
||||
</span> <span class="n">cipher_text</span> <span class="o">=</span> <span class="n">base64</span><span class="p">.</span><span class="n">b64encode</span><span class="p">(</span><span class="n">cipher</span><span class="p">.</span><span class="n">encrypt</span><span class="p">(</span><span class="n">message</span><span class="p">.</span><span class="n">encode</span><span class="p">(</span><span class="n">encoding</span><span class="o">=</span><span class="s">"utf-8"</span><span class="p">)))</span>
|
||||
<span class="c1"># 公钥每次加密的结果不一样跟对数据的padding（填充）有关
|
||||
</span> <span class="k">return</span> <span class="n">cipher_text</span><span class="p">.</span><span class="n">decode</span><span class="p">()</span>
|
||||
|
||||
<span class="k">class</span> <span class="nc">PrpCrypt</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
|
||||
|
||||
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">):</span>
|
||||
<span class="bp">self</span><span class="p">.</span><span class="n">key</span> <span class="o">=</span> <span class="n">key</span><span class="p">.</span><span class="n">encode</span><span class="p">(</span><span class="s">'utf-8'</span><span class="p">)</span>
|
||||
<span class="bp">self</span><span class="p">.</span><span class="n">mode</span> <span class="o">=</span> <span class="n">AES</span><span class="p">.</span><span class="n">MODE_CBC</span>
|
||||
|
||||
<span class="c1"># 加密函数，如果text不足16位就用空格补足为16位，
|
||||
</span> <span class="c1"># 如果大于16当时不是16的倍数，那就补足为16的倍数。
|
||||
</span> <span class="k">def</span> <span class="nf">encrypt</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">text</span><span class="p">):</span>
|
||||
<span class="n">text</span> <span class="o">=</span> <span class="n">text</span><span class="p">.</span><span class="n">encode</span><span class="p">(</span><span class="s">'utf-8'</span><span class="p">)</span>
|
||||
<span class="n">cryptor</span> <span class="o">=</span> <span class="n">AES</span><span class="p">.</span><span class="n">new</span><span class="p">(</span><span class="bp">self</span><span class="p">.</span><span class="n">key</span><span class="p">,</span> <span class="bp">self</span><span class="p">.</span><span class="n">mode</span><span class="p">,</span> <span class="sa">b</span><span class="s">'0000000000000000'</span><span class="p">)</span>
|
||||
<span class="c1"># 这里密钥key 长度必须为16（AES-128）,
|
||||
</span> <span class="c1"># 24（AES-192）,或者32 （AES-256）Bytes 长度
|
||||
</span> <span class="c1"># 目前AES-128 足够目前使用
|
||||
</span> <span class="n">length</span> <span class="o">=</span> <span class="mi">16</span>
|
||||
<span class="n">count</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">text</span><span class="p">)</span>
|
||||
<span class="k">if</span> <span class="n">count</span> <span class="o"><</span> <span class="n">length</span><span class="p">:</span>
|
||||
<span class="n">add</span> <span class="o">=</span> <span class="p">(</span><span class="n">length</span> <span class="o">-</span> <span class="n">count</span><span class="p">)</span>
|
||||
<span class="c1"># \0 backspace
|
||||
</span> <span class="c1"># text = text + ('\0' * add)
|
||||
</span> <span class="n">text</span> <span class="o">=</span> <span class="n">text</span> <span class="o">+</span> <span class="p">(</span><span class="s">'</span><span class="se">\0</span><span class="s">'</span> <span class="o">*</span> <span class="n">add</span><span class="p">).</span><span class="n">encode</span><span class="p">(</span><span class="s">'utf-8'</span><span class="p">)</span>
|
||||
<span class="k">elif</span> <span class="n">count</span> <span class="o">></span> <span class="n">length</span><span class="p">:</span>
|
||||
<span class="n">add</span> <span class="o">=</span> <span class="p">(</span><span class="n">length</span> <span class="o">-</span> <span class="p">(</span><span class="n">count</span> <span class="o">%</span> <span class="n">length</span><span class="p">))</span>
|
||||
<span class="c1"># text = text + ('\0' * add)
|
||||
</span> <span class="n">text</span> <span class="o">=</span> <span class="n">text</span> <span class="o">+</span> <span class="p">(</span><span class="s">'</span><span class="se">\0</span><span class="s">'</span> <span class="o">*</span> <span class="n">add</span><span class="p">).</span><span class="n">encode</span><span class="p">(</span><span class="s">'utf-8'</span><span class="p">)</span>
|
||||
<span class="bp">self</span><span class="p">.</span><span class="n">ciphertext</span> <span class="o">=</span> <span class="n">cryptor</span><span class="p">.</span><span class="n">encrypt</span><span class="p">(</span><span class="n">text</span><span class="p">)</span>
|
||||
<span class="c1"># 因为AES加密时候得到的字符串不一定是ascii字符集的，输出到终端或者保存时候可能存在问题
|
||||
</span> <span class="c1"># 所以这里统一把加密后的字符串转化为16进制字符串
|
||||
</span> <span class="k">return</span> <span class="n">base64</span><span class="p">.</span><span class="n">b64encode</span><span class="p">(</span><span class="bp">self</span><span class="p">.</span><span class="n">ciphertext</span><span class="p">)</span>
|
||||
|
||||
<span class="c1"># 解密后，去掉补足的空格用strip() 去掉
|
||||
</span> <span class="k">def</span> <span class="nf">decrypt</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">text</span><span class="p">):</span>
|
||||
<span class="n">cryptor</span> <span class="o">=</span> <span class="n">AES</span><span class="p">.</span><span class="n">new</span><span class="p">(</span><span class="bp">self</span><span class="p">.</span><span class="n">key</span><span class="p">,</span> <span class="bp">self</span><span class="p">.</span><span class="n">mode</span><span class="p">,</span> <span class="sa">b</span><span class="s">'0000000000000000'</span><span class="p">)</span>
|
||||
<span class="n">plain_text</span> <span class="o">=</span> <span class="n">cryptor</span><span class="p">.</span><span class="n">decrypt</span><span class="p">(</span><span class="n">base64</span><span class="p">.</span><span class="n">b64decode</span><span class="p">(</span><span class="n">text</span><span class="p">))</span>
|
||||
<span class="c1"># return plain_text.rstrip('\0')
|
||||
</span> <span class="k">return</span> <span class="nb">bytes</span><span class="p">.</span><span class="n">decode</span><span class="p">(</span><span class="n">plain_text</span><span class="p">).</span><span class="n">rstrip</span><span class="p">(</span><span class="s">'</span><span class="se">\0</span><span class="s">'</span><span class="p">)</span>
|
||||
|
||||
<span class="c1">#初始化阶段
|
||||
</span><span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
|
||||
<span class="k">try</span><span class="p">:</span>
|
||||
<span class="n">pipe</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s">"pipe.txt"</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="s">'r'</span><span class="p">)</span>
|
||||
<span class="k">except</span><span class="p">:</span>
|
||||
<span class="n">time</span><span class="p">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
|
||||
<span class="k">else</span><span class="p">:</span>
|
||||
<span class="k">break</span>
|
||||
<span class="n">pipe</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="c1">#协商密钥
|
||||
</span><span class="n">key</span> <span class="o">=</span> <span class="nb">str</span><span class="p">(</span><span class="n">random</span><span class="p">.</span><span class="n">randint</span><span class="p">(</span><span class="mi">1000000000000000</span><span class="p">,</span><span class="mi">9999999999999999</span><span class="p">))</span>
|
||||
<span class="n">akey</span> <span class="o">=</span> <span class="n">PrpCrypt</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
|
||||
<span class="n">cipher</span> <span class="o">=</span> <span class="n">rsa_encode</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">public_key</span><span class="p">)</span>
|
||||
<span class="n">data</span> <span class="o">=</span> <span class="n">json</span><span class="p">.</span><span class="n">dumps</span><span class="p">({</span><span class="s">"key"</span><span class="p">:</span><span class="n">cipher</span><span class="p">})</span>
|
||||
<span class="nb">file</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s">'pipe.txt'</span><span class="p">,</span><span class="s">'w'</span><span class="p">)</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="n">data</span><span class="p">,</span><span class="nb">file</span> <span class="o">=</span> <span class="nb">file</span><span class="p">)</span>
|
||||
<span class="nb">file</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
|
||||
<span class="n">pipe</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s">"pipe.txt"</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="s">'r'</span><span class="p">)</span>
|
||||
<span class="k">if</span> <span class="n">pipe</span><span class="p">.</span><span class="n">read</span><span class="p">()</span> <span class="o">==</span> <span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">:</span>
|
||||
<span class="n">pipe</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="k">break</span>
|
||||
<span class="n">pipe</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="n">time</span><span class="p">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="s">"成功发送密钥"</span><span class="p">,</span><span class="n">key</span><span class="p">)</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="s">"已建立连接"</span><span class="p">)</span>
|
||||
|
||||
<span class="c1">#处理阶段
|
||||
#Single Quest
|
||||
</span><span class="n">name</span> <span class="o">=</span> <span class="nb">input</span><span class="p">(</span><span class="s">"请输入用户名："</span><span class="p">)</span>
|
||||
<span class="n">pwd</span> <span class="o">=</span> <span class="nb">input</span><span class="p">(</span><span class="s">"请输入密码："</span><span class="p">)</span>
|
||||
<span class="nb">hash</span> <span class="o">=</span> <span class="n">hashlib</span><span class="p">.</span><span class="n">md5</span><span class="p">(</span><span class="n">pwd</span><span class="p">.</span><span class="n">encode</span><span class="p">(</span><span class="n">encoding</span><span class="o">=</span><span class="s">'UTF-8'</span><span class="p">)).</span><span class="n">hexdigest</span><span class="p">()</span>
|
||||
<span class="n">data</span> <span class="o">=</span> <span class="n">json</span><span class="p">.</span><span class="n">dumps</span><span class="p">({</span><span class="s">"from"</span><span class="p">:</span><span class="s">"Client"</span><span class="p">,</span><span class="s">"data"</span><span class="p">:</span><span class="n">akey</span><span class="p">.</span><span class="n">encrypt</span><span class="p">(</span><span class="n">json</span><span class="p">.</span><span class="n">dumps</span><span class="p">({</span><span class="s">"name"</span><span class="p">:</span><span class="n">name</span><span class="p">,</span><span class="s">"pwd"</span><span class="p">:</span><span class="nb">hash</span><span class="p">})).</span><span class="n">decode</span><span class="p">(</span><span class="s">"utf-8"</span><span class="p">)})</span>
|
||||
<span class="nb">file</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s">'pipe.txt'</span><span class="p">,</span><span class="s">'w'</span><span class="p">)</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="n">data</span><span class="p">,</span><span class="nb">file</span> <span class="o">=</span> <span class="nb">file</span><span class="p">)</span>
|
||||
<span class="nb">file</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="s">"已发出，等待回应"</span><span class="p">)</span>
|
||||
<span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
|
||||
<span class="n">pipe</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s">"pipe.txt"</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="s">'r'</span><span class="p">)</span>
|
||||
<span class="n">data</span> <span class="o">=</span> <span class="n">pipe</span><span class="p">.</span><span class="n">read</span><span class="p">()</span>
|
||||
<span class="k">if</span> <span class="ow">not</span> <span class="n">data</span> <span class="o">==</span> <span class="s">"</span><span class="se">\n</span><span class="s">"</span><span class="p">:</span>
|
||||
<span class="n">data</span> <span class="o">=</span> <span class="n">json</span><span class="p">.</span><span class="n">loads</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
|
||||
<span class="k">if</span> <span class="n">data</span><span class="p">[</span><span class="s">"from"</span><span class="p">]</span> <span class="o">==</span> <span class="s">"Server"</span><span class="p">:</span>
|
||||
<span class="n">pipe</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="k">break</span>
|
||||
<span class="n">pipe</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||||
<span class="n">time</span><span class="p">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="s">"已收到回应"</span><span class="p">)</span>
|
||||
<span class="n">data</span> <span class="o">=</span> <span class="n">akey</span><span class="p">.</span><span class="n">decrypt</span><span class="p">(</span><span class="n">data</span><span class="p">[</span><span class="s">"data"</span><span class="p">])</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
|
||||
<span class="k">print</span><span class="p">(</span><span class="s">"加密通道客户端演示结束"</span><span class="p">)</span>
|
||||
</code></pre></div></div>
|
||||
<h1 id="后记">
|
||||
|
||||
|
||||
<a href="#后记"><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> 后记
|
||||
|
||||
|
||||
</h1>
|
||||
|
||||
<p>关于SSL/TLS的具体内容我也没有好好看一遍，我打算回头有时间仔细看一看，然后再回来看这个代码是有多么的糟糕🤪。</p></main>
|
||||
|
||||
|
||||
<small style="display: block">tags: <a rel="category tag" class="p-category" href="/search.html?keyword=%E5%8A%A0%E5%AF%86"><em>加密</em></a> - <a rel="category tag" class="p-category" href="/search.html?keyword=Demo"><em>Demo</em></a> <span style="float: right;"><a href="https://gitlab.com/mayx/mayx.gitlab.io/tree/master/_posts/2020-06-13-encrypt.md">查看原始文件</a></span></small>
|
||||
|
||||
|
||||
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|
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tooltip.hide();
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|
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tooltip.css({
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<a href="/2020/06/06/demoscene.html">
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上一篇：关于Demoscene的探索
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<br />
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|
||||
<span class="next">
|
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<a href="/2020/06/17/backup.html">
|
||||
下一篇：论备份的重要性
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||||
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||||
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|
||||
<link rel="stylesheet" href="/assets/css/gitalk.css">
|
||||
<script src="/assets/js/gitalk.min.js"></script>
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<div id="gitalk-container"></div>
|
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||||
<script>
|
||||
var gitalk = new Gitalk({
|
||||
clientID: '36557aec4c3cb04f7ac6',
|
||||
clientSecret: 'ac32993299751cb5a9ba81cf2b171cca65879cdb',
|
||||
repo: 'mabbs.github.io',
|
||||
owner: 'Mabbs',
|
||||
admin: ['Mabbs'],
|
||||
id: '/2020/06/13/encrypt', // Ensure uniqueness and length less than 50
|
||||
distractionFreeMode: false, // Facebook-like distraction free mode
|
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proxy: "https://cors-anywhere.mayx.eu.org/?https://github.com/login/oauth/access_token"
|
||||
})
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gitalk.render('gitalk-container')
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<form id="live_talk_input_form">
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<span style="font-size: 11px; color: #fff;"> 想问这篇文章</span>
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|
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