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<p><a href="../../d8/d7a/sha1_8cpp_source.html">Go to the source code of this file.</a></p>
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Namespaces</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">namespace &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d6/d0c/namespacehashing.html">hashing</a></td></tr>
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<tr class="memdesc:d6/d0c/namespacehashing"><td class="mdescLeft">&#160;</td><td class="mdescRight">Used for assert. <br /></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">namespace &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../de/dd3/namespace_s_h_a.html">SHA</a></td></tr>
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<tr class="memdesc:de/dd3/namespace_s_h_a"><td class="mdescLeft">&#160;</td><td class="mdescRight">Functions for the <a href="https://en.wikipedia.org/wiki/SHA-1" target="_blank">SHA-1</a> algorithm implementation. <br /></td></tr>
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Functions</h2></td></tr>
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<tr class="memdesc:aada0803ef851d831b7a290a924e3c228"><td class="mdescLeft">&#160;</td><td class="mdescRight">Transforms the 160-bit SHA-1 signature into a 40 char hex string. <br /></td></tr>
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<tr class="memdesc:a7be3471f7e489d7d0df42b97a48bf141"><td class="mdescLeft">&#160;</td><td class="mdescRight">The SHA-1 algorithm itself, taking in a bytestring. <br /></td></tr>
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<tr class="memdesc:aa8dca7b867074164d5f45b0f3851269d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Self-test implementations of well-known SHA-1 hashes. <br /></td></tr>
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<tr class="memdesc:ac9e1a11f44135b890dd10a00e73b5661"><td class="mdescLeft">&#160;</td><td class="mdescRight">Puts user in a loop where inputs can be given and SHA-1 hash will be computed and printed. <br /></td></tr>
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<tr class="memdesc:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Main function. <br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Simple C++ implementation of the <a href="https://en.wikipedia.org/wiki/SHA-1" target="_blank">SHA-1 Hashing Algorithm</a> </p>
<dl class="section author"><dt>Author</dt><dd><a href="https://github.com/tGautot" target="_blank">tGautot</a> </dd></dl>
<p><a href="https://en.wikipedia.org/wiki/SHA-1" target="_blank">SHA-1</a> is a cryptographic hash function that was developped by the <a href="https://en.wikipedia.org/wiki/National_Security_Agency" target="_blank">NSA</a> 1995. SHA-1 is not considered secure since around 2010.</p>
<h3><a class="anchor" id="autotoc_md84"></a>
<h3 class="doxsection"><a class="anchor" id="autotoc_md84"></a>
Algorithm</h3>
<p>The first step of the algorithm is to pad the message for its length to be a multiple of 64 (bytes). This is done by first adding 0x80 (10000000) and then only zeroes until the last 8 bytes must be filled, where then the 64 bit size of the input will be added</p>
<p>Once this is done, the algo breaks down this padded message into 64 bytes chunks. Each chunk is used for one <em>round</em>, a round breaks the chunk into 16 blocks of 4 bytes. These 16 blocks are then extended to 80 blocks using <a class="el" href="../../d7/d47/namespace_x_o_r.html" title="Functions for XOR cipher algorithm.">XOR</a> operations on existing blocks (see code for more details). The algorithm will then update its 160-bit state (here represented used 5 32-bits integer) using partial hashes computed using special functions on the blocks previously built. Please take a look at the <a href="https://en.wikipedia.org/wiki/SHA-1#SHA-1_pseudocode" target="_blank">wikipedia article</a> for more precision on these operations </p><dl class="section note"><dt>Note</dt><dd>This is a simple implementation for a byte string but some implmenetations can work on bytestream, messages of unknown length. </dd></dl>
<p class="definition">Definition in file <a class="el" href="../../d8/d7a/sha1_8cpp_source.html">sha1.cpp</a>.</p>
</div><h2 class="groupheader">Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a2397f2444a05e4d1487c67e215410d3c">&#9670;&#160;</a></span>hash()</h2>
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