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Rushabh Mehta b624972f0d added new docs
2011-06-29 14:41:49 +05:30

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<h1>Source code for webnotes.utils.encrypt</h1><div class="highlight"><pre>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">XTEA Block Encryption Algorithm</span>
<span class="sd">Author: Paul Chakravarti (paul_dot_chakravarti_at_gmail_dot_com)</span>
<span class="sd">License: Public Domain</span>
<span class="sd">&quot;&quot;&quot;</span>
<div class="viewcode-block" id="get_key"><a class="viewcode-back" href="../../../webnotes.utils.html#webnotes.utils.encrypt.get_key">[docs]</a><span class="k">def</span> <span class="nf">get_key</span><span class="p">():</span>
<span class="c"># Encryption key is datetime of creation of DocType, DocType&quot;</span>
<span class="kn">import</span> <span class="nn">webnotes</span>
<span class="k">return</span> <span class="n">webnotes</span><span class="o">.</span><span class="n">conn</span><span class="o">.</span><span class="n">sql</span><span class="p">(</span><span class="s">&quot;select creation from tabDocType where name=&#39;DocType&#39;&quot;</span><span class="p">)[</span><span class="mi">0</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">strftime</span><span class="p">(</span><span class="s">&#39;%Y%m</span><span class="si">%d</span><span class="s">%H%M</span><span class="si">%s</span><span class="s">&#39;</span><span class="p">)[:</span><span class="mi">16</span><span class="p">]</span>
</div>
<div class="viewcode-block" id="encrypt"><a class="viewcode-back" href="../../../webnotes.utils.html#webnotes.utils.encrypt.encrypt">[docs]</a><span class="k">def</span> <span class="nf">encrypt</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">encryption_key</span> <span class="o">=</span> <span class="bp">None</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">encryption_key</span><span class="p">:</span>
<span class="n">encryption_key</span> <span class="o">=</span> <span class="n">get_key</span><span class="p">()</span>
<span class="k">return</span> <span class="n">crypt</span><span class="p">(</span><span class="n">encryption_key</span><span class="p">,</span> <span class="n">data</span><span class="p">)</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s">&#39;hex&#39;</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="decrypt"><a class="viewcode-back" href="../../../webnotes.utils.html#webnotes.utils.encrypt.decrypt">[docs]</a><span class="k">def</span> <span class="nf">decrypt</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">encryption_key</span> <span class="o">=</span> <span class="bp">None</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">encryption_key</span><span class="p">:</span>
<span class="n">encryption_key</span> <span class="o">=</span> <span class="n">get_key</span><span class="p">()</span>
<span class="k">return</span> <span class="n">crypt</span><span class="p">(</span><span class="n">encryption_key</span><span class="p">,</span> <span class="n">data</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s">&#39;hex&#39;</span><span class="p">))</span>
</div>
<div class="viewcode-block" id="crypt"><a class="viewcode-back" href="../../../webnotes.utils.html#webnotes.utils.encrypt.crypt">[docs]</a><span class="k">def</span> <span class="nf">crypt</span><span class="p">(</span><span class="n">key</span><span class="p">,</span><span class="n">data</span><span class="p">,</span><span class="n">iv</span><span class="o">=</span><span class="s">&#39;</span><span class="se">\00\00\00\00\00\00\00\00</span><span class="s">&#39;</span><span class="p">,</span><span class="n">n</span><span class="o">=</span><span class="mi">32</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">keygen</span><span class="p">(</span><span class="n">key</span><span class="p">,</span><span class="n">iv</span><span class="p">,</span><span class="n">n</span><span class="p">):</span>
<span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
<span class="n">iv</span> <span class="o">=</span> <span class="n">xtea_encrypt</span><span class="p">(</span><span class="n">key</span><span class="p">,</span><span class="n">iv</span><span class="p">,</span><span class="n">n</span><span class="p">)</span>
<span class="k">for</span> <span class="n">k</span> <span class="ow">in</span> <span class="n">iv</span><span class="p">:</span>
<span class="k">yield</span> <span class="nb">ord</span><span class="p">(</span><span class="n">k</span><span class="p">)</span>
<span class="n">xor</span> <span class="o">=</span> <span class="p">[</span> <span class="nb">chr</span><span class="p">(</span><span class="n">x</span><span class="o">^</span><span class="n">y</span><span class="p">)</span> <span class="k">for</span> <span class="p">(</span><span class="n">x</span><span class="p">,</span><span class="n">y</span><span class="p">)</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="nb">map</span><span class="p">(</span><span class="nb">ord</span><span class="p">,</span><span class="n">data</span><span class="p">),</span><span class="n">keygen</span><span class="p">(</span><span class="n">key</span><span class="p">,</span><span class="n">iv</span><span class="p">,</span><span class="n">n</span><span class="p">))</span> <span class="p">]</span>
<span class="k">return</span> <span class="s">&quot;&quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">xor</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="xtea_encrypt"><a class="viewcode-back" href="../../../webnotes.utils.html#webnotes.utils.encrypt.xtea_encrypt">[docs]</a><span class="k">def</span> <span class="nf">xtea_encrypt</span><span class="p">(</span><span class="n">key</span><span class="p">,</span><span class="n">block</span><span class="p">,</span><span class="n">n</span><span class="o">=</span><span class="mi">32</span><span class="p">,</span><span class="n">endian</span><span class="o">=</span><span class="s">&quot;!&quot;</span><span class="p">):</span>
<span class="kn">import</span> <span class="nn">struct</span>
<span class="n">v0</span><span class="p">,</span><span class="n">v1</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack</span><span class="p">(</span><span class="n">endian</span><span class="o">+</span><span class="s">&quot;2L&quot;</span><span class="p">,</span><span class="n">block</span><span class="p">)</span>
<span class="n">k</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack</span><span class="p">(</span><span class="n">endian</span><span class="o">+</span><span class="s">&quot;4L&quot;</span><span class="p">,</span><span class="n">key</span><span class="p">)</span>
<span class="nb">sum</span><span class="p">,</span><span class="n">delta</span><span class="p">,</span><span class="n">mask</span> <span class="o">=</span> <span class="il">0L</span><span class="p">,</span><span class="mh">0x9e3779b9</span><span class="n">L</span><span class="p">,</span><span class="mh">0xffffffff</span><span class="n">L</span>
<span class="k">for</span> <span class="nb">round</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">n</span><span class="p">):</span>
<span class="n">v0</span> <span class="o">=</span> <span class="p">(</span><span class="n">v0</span> <span class="o">+</span> <span class="p">(((</span><span class="n">v1</span><span class="o">&lt;&lt;</span><span class="mi">4</span> <span class="o">^</span> <span class="n">v1</span><span class="o">&gt;&gt;</span><span class="mi">5</span><span class="p">)</span> <span class="o">+</span> <span class="n">v1</span><span class="p">)</span> <span class="o">^</span> <span class="p">(</span><span class="nb">sum</span> <span class="o">+</span> <span class="n">k</span><span class="p">[</span><span class="nb">sum</span> <span class="o">&amp;</span> <span class="mi">3</span><span class="p">])))</span> <span class="o">&amp;</span> <span class="n">mask</span>
<span class="nb">sum</span> <span class="o">=</span> <span class="p">(</span><span class="nb">sum</span> <span class="o">+</span> <span class="n">delta</span><span class="p">)</span> <span class="o">&amp;</span> <span class="n">mask</span>
<span class="n">v1</span> <span class="o">=</span> <span class="p">(</span><span class="n">v1</span> <span class="o">+</span> <span class="p">(((</span><span class="n">v0</span><span class="o">&lt;&lt;</span><span class="mi">4</span> <span class="o">^</span> <span class="n">v0</span><span class="o">&gt;&gt;</span><span class="mi">5</span><span class="p">)</span> <span class="o">+</span> <span class="n">v0</span><span class="p">)</span> <span class="o">^</span> <span class="p">(</span><span class="nb">sum</span> <span class="o">+</span> <span class="n">k</span><span class="p">[</span><span class="nb">sum</span><span class="o">&gt;&gt;</span><span class="mi">11</span> <span class="o">&amp;</span> <span class="mi">3</span><span class="p">])))</span> <span class="o">&amp;</span> <span class="n">mask</span>
<span class="k">return</span> <span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="n">endian</span><span class="o">+</span><span class="s">&quot;2L&quot;</span><span class="p">,</span><span class="n">v0</span><span class="p">,</span><span class="n">v1</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="xtea_decrypt"><a class="viewcode-back" href="../../../webnotes.utils.html#webnotes.utils.encrypt.xtea_decrypt">[docs]</a><span class="k">def</span> <span class="nf">xtea_decrypt</span><span class="p">(</span><span class="n">key</span><span class="p">,</span><span class="n">block</span><span class="p">,</span><span class="n">n</span><span class="o">=</span><span class="mi">32</span><span class="p">,</span><span class="n">endian</span><span class="o">=</span><span class="s">&quot;!&quot;</span><span class="p">):</span>
<span class="kn">import</span> <span class="nn">struct</span>
<span class="n">v0</span><span class="p">,</span><span class="n">v1</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack</span><span class="p">(</span><span class="n">endian</span><span class="o">+</span><span class="s">&quot;2L&quot;</span><span class="p">,</span><span class="n">block</span><span class="p">)</span>
<span class="n">k</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">unpack</span><span class="p">(</span><span class="n">endian</span><span class="o">+</span><span class="s">&quot;4L&quot;</span><span class="p">,</span><span class="n">key</span><span class="p">)</span>
<span class="n">delta</span><span class="p">,</span><span class="n">mask</span> <span class="o">=</span> <span class="mh">0x9e3779b9</span><span class="n">L</span><span class="p">,</span><span class="mh">0xffffffff</span><span class="n">L</span>
<span class="nb">sum</span> <span class="o">=</span> <span class="p">(</span><span class="n">delta</span> <span class="o">*</span> <span class="n">n</span><span class="p">)</span> <span class="o">&amp;</span> <span class="n">mask</span>
<span class="k">for</span> <span class="nb">round</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">n</span><span class="p">):</span>
<span class="n">v1</span> <span class="o">=</span> <span class="p">(</span><span class="n">v1</span> <span class="o">-</span> <span class="p">(((</span><span class="n">v0</span><span class="o">&lt;&lt;</span><span class="mi">4</span> <span class="o">^</span> <span class="n">v0</span><span class="o">&gt;&gt;</span><span class="mi">5</span><span class="p">)</span> <span class="o">+</span> <span class="n">v0</span><span class="p">)</span> <span class="o">^</span> <span class="p">(</span><span class="nb">sum</span> <span class="o">+</span> <span class="n">k</span><span class="p">[</span><span class="nb">sum</span><span class="o">&gt;&gt;</span><span class="mi">11</span> <span class="o">&amp;</span> <span class="mi">3</span><span class="p">])))</span> <span class="o">&amp;</span> <span class="n">mask</span>
<span class="nb">sum</span> <span class="o">=</span> <span class="p">(</span><span class="nb">sum</span> <span class="o">-</span> <span class="n">delta</span><span class="p">)</span> <span class="o">&amp;</span> <span class="n">mask</span>
<span class="n">v0</span> <span class="o">=</span> <span class="p">(</span><span class="n">v0</span> <span class="o">-</span> <span class="p">(((</span><span class="n">v1</span><span class="o">&lt;&lt;</span><span class="mi">4</span> <span class="o">^</span> <span class="n">v1</span><span class="o">&gt;&gt;</span><span class="mi">5</span><span class="p">)</span> <span class="o">+</span> <span class="n">v1</span><span class="p">)</span> <span class="o">^</span> <span class="p">(</span><span class="nb">sum</span> <span class="o">+</span> <span class="n">k</span><span class="p">[</span><span class="nb">sum</span> <span class="o">&amp;</span> <span class="mi">3</span><span class="p">])))</span> <span class="o">&amp;</span> <span class="n">mask</span>
<span class="k">return</span> <span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="n">endian</span><span class="o">+</span><span class="s">&quot;2L&quot;</span><span class="p">,</span><span class="n">v0</span><span class="p">,</span><span class="n">v1</span><span class="p">)</span>
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