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<p>Simple C++ implementation of the [SHA-256 Hashing Algorithm] (<a href="https://en.wikipedia.org/wiki/SHA-2">https://en.wikipedia.org/wiki/SHA-2</a>)
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<a href="#details">More...</a></p>
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<div class="textblock"><code>#include <array></code><br />
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<code>#include <cassert></code><br />
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<code>#include <cstdint></code><br />
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<code>#include <iomanip></code><br />
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<code>#include <iostream></code><br />
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<code>#include <sstream></code><br />
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<code>#include <utility></code><br />
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<code>#include <vector></code><br />
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Include dependency graph for sha256.cpp:</div>
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<p><a href="../../d4/d08/sha256_8cpp_source.html">Go to the source code of this file.</a></p>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 id="header-nested-classes" class="groupheader"><a id="nested-classes" name="nested-classes"></a>
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Classes</h2></td></tr>
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<tr class="memitem:hashing_3A_3Asha256_3A_3AHash" id="r_hashing_3A_3Asha256_3A_3AHash"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d6/d84/classhashing_1_1sha256_1_1_hash.html">hashing::sha256::Hash</a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Contains hash array and functions to update it and convert it to a hexadecimal string. <a href="../../d6/d84/classhashing_1_1sha256_1_1_hash.html#details">More...</a><br /></td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 id="header-namespaces" class="groupheader"><a id="namespaces" name="namespaces"></a>
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Namespaces</h2></td></tr>
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<tr class="memitem:hashing" id="r_hashing"><td class="memItemLeft" align="right" valign="top">namespace  </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"> </td><td class="mdescRight">Used for assert. <br /></td></tr>
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<tr class="memitem:SHA" id="r_SHA"><td class="memItemLeft" align="right" valign="top">namespace  </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"> </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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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 id="header-func-members" class="groupheader"><a id="func-members" name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:adbcd504103c342a4da718f8fce6ff06c" id="r_adbcd504103c342a4da718f8fce6ff06c"><td class="memItemLeft" align="right" valign="top">uint32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="#adbcd504103c342a4da718f8fce6ff06c">hashing::sha256::right_rotate</a> (uint32_t n, size_t rotate)</td></tr>
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<tr class="memdesc:adbcd504103c342a4da718f8fce6ff06c"><td class="mdescLeft"> </td><td class="mdescRight">Rotates the bits of a 32-bit unsigned integer. <br /></td></tr>
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<tr class="memitem:a28c1c6724dc6bcf91a39818699bbec27" id="r_a28c1c6724dc6bcf91a39818699bbec27"><td class="memItemLeft" align="right" valign="top">std::size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="#a28c1c6724dc6bcf91a39818699bbec27">hashing::sha256::compute_padded_size</a> (const std::size_t input_size)</td></tr>
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<tr class="memdesc:a28c1c6724dc6bcf91a39818699bbec27"><td class="mdescLeft"> </td><td class="mdescRight">Computes size of the padded input. <br /></td></tr>
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<tr class="memitem:afea411191ec5281f43e91ea327984627" id="r_afea411191ec5281f43e91ea327984627"><td class="memTemplParams" colspan="2">template<typename T> </td></tr>
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<tr class="memitem:afea411191ec5281f43e91ea327984627 template"><td class="memItemLeft" align="right" valign="top">uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="#afea411191ec5281f43e91ea327984627">hashing::sha256::extract_byte</a> (const T in_value, const std::size_t byte_num)</td></tr>
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<tr class="memdesc:afea411191ec5281f43e91ea327984627"><td class="mdescLeft"> </td><td class="mdescRight">Returns the byte at position byte_num in in_value. <br /></td></tr>
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<tr class="memitem:a9e98c180d32b04aab6f767cb0c13e1da" id="r_a9e98c180d32b04aab6f767cb0c13e1da"><td class="memItemLeft" align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="#a9e98c180d32b04aab6f767cb0c13e1da">hashing::sha256::get_char</a> (const std::string &input, std::size_t pos)</td></tr>
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<tr class="memdesc:a9e98c180d32b04aab6f767cb0c13e1da"><td class="mdescLeft"> </td><td class="mdescRight">Returns the character at pos after the input is padded. <br /></td></tr>
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<tr class="memitem:a525531b3939ed44fbf01674e21931b3a" id="r_a525531b3939ed44fbf01674e21931b3a"><td class="memItemLeft" align="right" valign="top">std::array< uint32_t, 64 > </td><td class="memItemRight" valign="bottom"><a class="el" href="#a525531b3939ed44fbf01674e21931b3a">hashing::sha256::create_message_schedule_array</a> (const std::string &input, const size_t byte_num)</td></tr>
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<tr class="memdesc:a525531b3939ed44fbf01674e21931b3a"><td class="mdescLeft"> </td><td class="mdescRight">Creates the message schedule array. <br /></td></tr>
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<tr class="memitem:a55475649a2bb7aae15de0716a217f43a" id="r_a55475649a2bb7aae15de0716a217f43a"><td class="memItemLeft" align="right" valign="top">std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="#a55475649a2bb7aae15de0716a217f43a">hashing::sha256::sha256</a> (const std::string &input)</td></tr>
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<tr class="memdesc:a55475649a2bb7aae15de0716a217f43a"><td class="mdescLeft"> </td><td class="mdescRight">Computes the final hash value. <br /></td></tr>
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<tr class="memitem:af9b52eba85d23e309035354141259f27" id="r_af9b52eba85d23e309035354141259f27"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="#af9b52eba85d23e309035354141259f27">test_compute_padded_size</a> ()</td></tr>
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<tr class="memdesc:af9b52eba85d23e309035354141259f27"><td class="mdescLeft"> </td><td class="mdescRight">Self-test implementations. <br /></td></tr>
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<tr class="memitem:a5afb183bc9072e33fed6c375ae6b7341" id="r_a5afb183bc9072e33fed6c375ae6b7341"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="#a5afb183bc9072e33fed6c375ae6b7341">test_extract_byte</a> ()</td></tr>
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<tr class="memitem:ad2776cb73ddf27e044f890b4a79ab947" id="r_ad2776cb73ddf27e044f890b4a79ab947"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="#ad2776cb73ddf27e044f890b4a79ab947">test_get_char</a> ()</td></tr>
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<tr class="memitem:a33eb7fad4a4b36804c881e0ee98effc1" id="r_a33eb7fad4a4b36804c881e0ee98effc1"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="#a33eb7fad4a4b36804c881e0ee98effc1">test_right_rotate</a> ()</td></tr>
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<tr class="memitem:a51e22dc64aeeda7363a674627f37e966" id="r_a51e22dc64aeeda7363a674627f37e966"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="#a51e22dc64aeeda7363a674627f37e966">test_sha256</a> ()</td></tr>
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<tr class="memitem:aa8dca7b867074164d5f45b0f3851269d" id="r_aa8dca7b867074164d5f45b0f3851269d"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="#aa8dca7b867074164d5f45b0f3851269d">test</a> ()</td></tr>
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<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4" id="r_ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
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<tr class="memdesc:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="mdescLeft"> </td><td class="mdescRight">Main function. <br /></td></tr>
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</table>
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<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Simple C++ implementation of the [SHA-256 Hashing Algorithm] (<a href="https://en.wikipedia.org/wiki/SHA-2">https://en.wikipedia.org/wiki/SHA-2</a>) </p>
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<dl class="section author"><dt>Author</dt><dd><a href="https://github.com/mdanisulh" target="_blank">Md. Anisul Haque</a> </dd></dl>
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<p><a href="https://en.wikipedia.org/wiki/SHA-2" target="_blank">SHA-2</a> is a set of cryptographic hash functions that was designed by the <a href="https://en.wikipedia.org/wiki/National_Security_Agency" target="_blank">NSA</a> and first published in 2001. SHA-256 is a part of the SHA-2 family. SHA-256 is widely used for authenticating software packages and secure password hashing. </p>
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<p class="definition">Definition in file <a class="el" href="../../d4/d08/sha256_8cpp_source.html">sha256.cpp</a>.</p>
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</div><a name="doc-func-members" id="doc-func-members"></a><h2 id="header-doc-func-members" class="groupheader">Function Documentation</h2>
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<a id="a28c1c6724dc6bcf91a39818699bbec27" name="a28c1c6724dc6bcf91a39818699bbec27"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a28c1c6724dc6bcf91a39818699bbec27">◆ </a></span>compute_padded_size()</h2>
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<div class="memitem">
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<td class="memname">std::size_t hashing::sha256::compute_padded_size </td>
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<td>(</td>
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<td class="paramtype">const std::size_t</td> <td class="paramname"><span class="paramname"><em>input_size</em></span></td><td>)</td>
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<td></td>
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<p>Computes size of the padded input. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">input</td><td>Input string </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>size_t Size of the padded input </dd></dl>
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<p class="definition">Definition at line <a class="el" href="../../d4/d08/sha256_8cpp_source.html#l00143">143</a> of file <a class="el" href="../../d4/d08/sha256_8cpp_source.html">sha256.cpp</a>.</p>
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<div class="fragment"><div class="line"><span class="lineno"> 143</span> {</div>
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<div class="line"><span class="lineno"> 144</span> <span class="keywordflow">if</span> (input_size % 64 < 56) {</div>
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<div class="line"><span class="lineno"> 145</span> <span class="keywordflow">return</span> input_size + 64 - (input_size % 64);</div>
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<div class="line"><span class="lineno"> 146</span> }</div>
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<div class="line"><span class="lineno"> 147</span> <span class="keywordflow">return</span> input_size + 128 - (input_size % 64);</div>
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<div class="line"><span class="lineno"> 148</span>}</div>
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</div><!-- fragment -->
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</div>
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</div>
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<a id="a525531b3939ed44fbf01674e21931b3a" name="a525531b3939ed44fbf01674e21931b3a"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a525531b3939ed44fbf01674e21931b3a">◆ </a></span>create_message_schedule_array()</h2>
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<td class="memname">std::array< uint32_t, 64 > hashing::sha256::create_message_schedule_array </td>
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<td>(</td>
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<td class="paramtype">const std::string &</td> <td class="paramname"><span class="paramname"><em>input</em></span>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">const size_t</td> <td class="paramname"><span class="paramname"><em>byte_num</em></span> )</td>
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<p>Creates the message schedule array. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">input</td><td>Input string </td></tr>
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<tr><td class="paramname">byte_num</td><td>Position of the first byte of the chunk </td></tr>
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</table>
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</dd>
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<dl class="section return"><dt>Returns</dt><dd>std::array<uint32_t, 64> Message schedule array </dd></dl>
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<p class="definition">Definition at line <a class="el" href="../../d4/d08/sha256_8cpp_source.html#l00195">195</a> of file <a class="el" href="../../d4/d08/sha256_8cpp_source.html">sha256.cpp</a>.</p>
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<div class="fragment"><div class="line"><span class="lineno"> 196</span> {</div>
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<div class="line"><span class="lineno"> 197</span> std::array<uint32_t, 64> blocks{};</div>
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<div class="line"><span class="lineno"> 198</span> </div>
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<div class="line"><span class="lineno"> 199</span> <span class="comment">// Copy chunk into first 16 words of the message schedule array</span></div>
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<div class="line"><span class="lineno"> 200</span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> block_num = 0; block_num < 16; ++block_num) {</div>
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<div class="line"><span class="lineno"> 201</span> blocks[block_num] =</div>
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<div class="line"><span class="lineno"> 202</span> (<span class="keyword">static_cast<</span>uint8_t<span class="keyword">></span>(get_char(input, byte_num + block_num * 4))</div>
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<div class="line"><span class="lineno"> 203</span> << 24) |</div>
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<div class="line"><span class="lineno"> 204</span> (<span class="keyword">static_cast<</span>uint8_t<span class="keyword">></span>(get_char(input, byte_num + block_num * 4 + 1))</div>
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<div class="line"><span class="lineno"> 205</span> << 16) |</div>
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<div class="line"><span class="lineno"> 206</span> (<span class="keyword">static_cast<</span>uint8_t<span class="keyword">></span>(get_char(input, byte_num + block_num * 4 + 2))</div>
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<div class="line"><span class="lineno"> 207</span> << 8) |</div>
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<div class="line"><span class="lineno"> 208</span> <span class="keyword">static_cast<</span>uint8_t<span class="keyword">></span>(get_char(input, byte_num + block_num * 4 + 3));</div>
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<div class="line"><span class="lineno"> 209</span> }</div>
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<div class="line"><span class="lineno"> 210</span> </div>
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<div class="line"><span class="lineno"> 211</span> <span class="comment">// Extend the first 16 words into remaining 48 words of the message schedule</span></div>
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<div class="line"><span class="lineno"> 212</span> <span class="comment">// array</span></div>
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<div class="line"><span class="lineno"> 213</span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> block_num = 16; block_num < 64; ++block_num) {</div>
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<div class="line"><span class="lineno"> 214</span> <span class="keyword">const</span> <span class="keyword">auto</span> s0 = right_rotate(blocks[block_num - 15], 7) ^</div>
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<div class="line"><span class="lineno"> 215</span> right_rotate(blocks[block_num - 15], 18) ^</div>
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<div class="line"><span class="lineno"> 216</span> (blocks[block_num - 15] >> 3);</div>
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<div class="line"><span class="lineno"> 217</span> <span class="keyword">const</span> <span class="keyword">auto</span> s1 = right_rotate(blocks[block_num - 2], 17) ^</div>
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<div class="line"><span class="lineno"> 218</span> right_rotate(blocks[block_num - 2], 19) ^</div>
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<div class="line"><span class="lineno"> 219</span> (blocks[block_num - 2] >> 10);</div>
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<div class="line"><span class="lineno"> 220</span> blocks[block_num] =</div>
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<div class="line"><span class="lineno"> 221</span> blocks[block_num - 16] + s0 + blocks[block_num - 7] + s1;</div>
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<div class="line"><span class="lineno"> 222</span> }</div>
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<div class="line"><span class="lineno"> 223</span> </div>
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<div class="line"><span class="lineno"> 224</span> <span class="keywordflow">return</span> blocks;</div>
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<div class="line"><span class="lineno"> 225</span>}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#afea411191ec5281f43e91ea327984627">◆ </a></span>extract_byte()</h2>
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<td class="memname">uint8_t hashing::sha256::extract_byte </td>
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<p>Returns the byte at position byte_num in in_value. </p>
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<tr><td class="paramname">in_value</td><td>Input value </td></tr>
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<tr><td class="paramname">byte_num</td><td>Position of byte to be returned </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>uint8_t Byte at position byte_num </dd></dl>
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<p class="definition">Definition at line <a class="el" href="../../d4/d08/sha256_8cpp_source.html#l00157">157</a> of file <a class="el" href="../../d4/d08/sha256_8cpp_source.html">sha256.cpp</a>.</p>
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<div class="fragment"><div class="line"><span class="lineno"> 157</span> {</div>
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<div class="line"><span class="lineno"> 158</span> <span class="keywordflow">if</span> (<span class="keyword">sizeof</span>(in_value) <= byte_num) {</div>
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<div class="line"><span class="lineno"> 159</span> <span class="keywordflow">throw</span> std::out_of_range(<span class="stringliteral">"Byte at index byte_num does not exist"</span>);</div>
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<div class="line"><span class="lineno"> 160</span> }</div>
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<div class="line"><span class="lineno"> 161</span> <span class="keywordflow">return</span> (in_value >> (byte_num * 8)) & 0xFF;</div>
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<div class="line"><span class="lineno"> 162</span>}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a9e98c180d32b04aab6f767cb0c13e1da">◆ </a></span>get_char()</h2>
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<td class="memname">char hashing::sha256::get_char </td>
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<td>(</td>
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<td class="paramtype">const std::string &</td> <td class="paramname"><span class="paramname"><em>input</em></span>, </td>
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<p>Returns the character at pos after the input is padded. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">input</td><td>Input string </td></tr>
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<tr><td class="paramname">pos</td><td>Position of character to be returned </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>char Character at the index pos in the padded string </dd></dl>
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<p class="definition">Definition at line <a class="el" href="../../d4/d08/sha256_8cpp_source.html#l00170">170</a> of file <a class="el" href="../../d4/d08/sha256_8cpp_source.html">sha256.cpp</a>.</p>
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<div class="fragment"><div class="line"><span class="lineno"> 170</span> {</div>
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<div class="line"><span class="lineno"> 171</span> <span class="keyword">const</span> <span class="keyword">auto</span> input_size = input.length();</div>
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<div class="line"><span class="lineno"> 172</span> <span class="keywordflow">if</span> (pos < input_size) {</div>
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<div class="line"><span class="lineno"> 173</span> <span class="keywordflow">return</span> input[pos];</div>
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<div class="line"><span class="lineno"> 174</span> }</div>
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<div class="line"><span class="lineno"> 175</span> <span class="keywordflow">if</span> (pos == input_size) {</div>
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<div class="line"><span class="lineno"> 176</span> <span class="keywordflow">return</span> <span class="stringliteral">'\x80'</span>;</div>
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<div class="line"><span class="lineno"> 177</span> }</div>
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<div class="line"><span class="lineno"> 178</span> <span class="keyword">const</span> <span class="keyword">auto</span> padded_input_size = compute_padded_size(input_size);</div>
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<div class="line"><span class="lineno"> 179</span> <span class="keywordflow">if</span> (pos < padded_input_size - 8) {</div>
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<div class="line"><span class="lineno"> 180</span> <span class="keywordflow">return</span> <span class="stringliteral">'\x00'</span>;</div>
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<div class="line"><span class="lineno"> 181</span> }</div>
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<div class="line"><span class="lineno"> 182</span> <span class="keywordflow">if</span> (padded_input_size <= pos) {</div>
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<div class="line"><span class="lineno"> 183</span> <span class="keywordflow">throw</span> std::out_of_range(<span class="stringliteral">"pos is out of range"</span>);</div>
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<div class="line"><span class="lineno"> 184</span> }</div>
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<div class="line"><span class="lineno"> 185</span> <span class="keywordflow">return</span> <span class="keyword">static_cast<</span><span class="keywordtype">char</span><span class="keyword">></span>(</div>
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<div class="line"><span class="lineno"> 186</span> <a class="code hl_function" href="#afea411191ec5281f43e91ea327984627">extract_byte<size_t></a>(input_size * 8, padded_input_size - pos - 1));</div>
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<div class="line"><span class="lineno"> 187</span>}</div>
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<div class="ttc" id="asha256_8cpp_html_afea411191ec5281f43e91ea327984627"><div class="ttname"><a href="#afea411191ec5281f43e91ea327984627">hashing::sha256::extract_byte</a></div><div class="ttdeci">uint8_t extract_byte(const T in_value, const std::size_t byte_num)</div><div class="ttdoc">Returns the byte at position byte_num in in_value.</div><div class="ttdef"><b>Definition</b> <a href="../../d4/d08/sha256_8cpp_source.html#l00157">sha256.cpp:157</a></div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">◆ </a></span>main()</h2>
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<td class="memname">int main </td>
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<p>Main function. </p>
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<dl class="section return"><dt>Returns</dt><dd>0 on exit </dd></dl>
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<p class="definition">Definition at line <a class="el" href="../../d4/d08/sha256_8cpp_source.html#l00326">326</a> of file <a class="el" href="../../d4/d08/sha256_8cpp_source.html">sha256.cpp</a>.</p>
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<div class="fragment"><div class="line"><span class="lineno"> 326</span> {</div>
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<div class="line"><span class="lineno"> 327</span> <a class="code hl_function" href="../../dd/d1e/generate__parentheses_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// Run self-test implementations</span></div>
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<div class="line"><span class="lineno"> 328</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><span class="lineno"> 329</span>}</div>
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<div class="ttc" id="agenerate__parentheses_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../dd/d1e/generate__parentheses_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdoc">Self-test implementations.</div><div class="ttdef"><b>Definition</b> <a href="../../dd/d1e/generate__parentheses_8cpp_source.html#l00082">generate_parentheses.cpp:82</a></div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#adbcd504103c342a4da718f8fce6ff06c">◆ </a></span>right_rotate()</h2>
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<td class="memname">uint32_t hashing::sha256::right_rotate </td>
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<td>(</td>
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<p>Rotates the bits of a 32-bit unsigned integer. </p>
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<table class="params">
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<tr><td class="paramname">n</td><td>Integer to rotate </td></tr>
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<tr><td class="paramname">rotate</td><td>Number of bits to rotate </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>uint32_t The rotated integer </dd></dl>
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<p class="definition">Definition at line <a class="el" href="../../d4/d08/sha256_8cpp_source.html#l00058">58</a> of file <a class="el" href="../../d4/d08/sha256_8cpp_source.html">sha256.cpp</a>.</p>
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<div class="line"><span class="lineno"> 59</span> <span class="keywordflow">return</span> (n >> rotate) | (n << (32 - rotate));</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a55475649a2bb7aae15de0716a217f43a">◆ </a></span>sha256()</h2>
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<td>(</td>
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<p>Computes the final hash value. </p>
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<dl class="section return"><dt>Returns</dt><dd>std::string The final hash value </dd></dl>
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<p class="definition">Definition at line <a class="el" href="../../d4/d08/sha256_8cpp_source.html#l00232">232</a> of file <a class="el" href="../../d4/d08/sha256_8cpp_source.html">sha256.cpp</a>.</p>
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<div class="fragment"><div class="line"><span class="lineno"> 232</span> {</div>
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<div class="line"><span class="lineno"> 233</span> <a class="code hl_class" href="../../d6/d84/classhashing_1_1sha256_1_1_hash.html">Hash</a> <a class="code hl_function" href="../../d1/df3/hash__search_8cpp.html#a566eaf0ffafd50bc61e644561fd27001">h</a>;</div>
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<div class="line"><span class="lineno"> 234</span> <span class="comment">// Process message in successive 512-bit (64-byte) chunks</span></div>
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<div class="line"><span class="lineno"> 235</span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> byte_num = 0; byte_num < <a class="code hl_function" href="#a28c1c6724dc6bcf91a39818699bbec27">compute_padded_size</a>(input.length());</div>
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<div class="line"><span class="lineno"> 236</span> byte_num += 64) {</div>
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<div class="line"><span class="lineno"> 237</span> <a class="code hl_function" href="../../d1/df3/hash__search_8cpp.html#a566eaf0ffafd50bc61e644561fd27001">h</a>.update(<a class="code hl_function" href="#a525531b3939ed44fbf01674e21931b3a">create_message_schedule_array</a>(input, byte_num));</div>
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<div class="line"><span class="lineno"> 238</span> }</div>
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<div class="line"><span class="lineno"> 239</span> <span class="keywordflow">return</span> <a class="code hl_function" href="../../d1/df3/hash__search_8cpp.html#a566eaf0ffafd50bc61e644561fd27001">h</a>.to_string();</div>
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<div class="line"><span class="lineno"> 240</span>}</div>
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<div class="ttc" id="aclasshashing_1_1sha256_1_1_hash_html"><div class="ttname"><a href="../../d6/d84/classhashing_1_1sha256_1_1_hash.html">hashing::sha256::Hash</a></div><div class="ttdoc">Contains hash array and functions to update it and convert it to a hexadecimal string.</div><div class="ttdef"><b>Definition</b> <a href="../../d4/d08/sha256_8cpp_source.html#l00040">sha256.cpp:40</a></div></div>
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<div class="ttc" id="ahash__search_8cpp_html_a566eaf0ffafd50bc61e644561fd27001"><div class="ttname"><a href="../../d1/df3/hash__search_8cpp.html#a566eaf0ffafd50bc61e644561fd27001">h</a></div><div class="ttdeci">int h(int key)</div><div class="ttdef"><b>Definition</b> <a href="../../d1/df3/hash__search_8cpp_source.html#l00045">hash_search.cpp:45</a></div></div>
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<div class="ttc" id="asha256_8cpp_html_a28c1c6724dc6bcf91a39818699bbec27"><div class="ttname"><a href="#a28c1c6724dc6bcf91a39818699bbec27">hashing::sha256::compute_padded_size</a></div><div class="ttdeci">std::size_t compute_padded_size(const std::size_t input_size)</div><div class="ttdoc">Computes size of the padded input.</div><div class="ttdef"><b>Definition</b> <a href="../../d4/d08/sha256_8cpp_source.html#l00143">sha256.cpp:143</a></div></div>
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<div class="ttc" id="asha256_8cpp_html_a525531b3939ed44fbf01674e21931b3a"><div class="ttname"><a href="#a525531b3939ed44fbf01674e21931b3a">hashing::sha256::create_message_schedule_array</a></div><div class="ttdeci">std::array< uint32_t, 64 > create_message_schedule_array(const std::string &input, const size_t byte_num)</div><div class="ttdoc">Creates the message schedule array.</div><div class="ttdef"><b>Definition</b> <a href="../../d4/d08/sha256_8cpp_source.html#l00195">sha256.cpp:195</a></div></div>
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<p class="definition">Definition at line <a class="el" href="../../d4/d08/sha256_8cpp_source.html#l00312">312</a> of file <a class="el" href="../../d4/d08/sha256_8cpp_source.html">sha256.cpp</a>.</p>
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<div class="fragment"><div class="line"><span class="lineno"> 312</span> {</div>
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<div class="line"><span class="lineno"> 313</span> <a class="code hl_function" href="#af9b52eba85d23e309035354141259f27">test_compute_padded_size</a>();</div>
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<div class="line"><span class="lineno"> 314</span> test_extract_byte();</div>
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<div class="line"><span class="lineno"> 318</span> </div>
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<div class="line"><span class="lineno"> 319</span> std::cout << <span class="stringliteral">"All tests have successfully passed!\n"</span>;</div>
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<div class="line"><span class="lineno"> 320</span>}</div>
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<div class="ttc" id="asha256_8cpp_html_af9b52eba85d23e309035354141259f27"><div class="ttname"><a href="#af9b52eba85d23e309035354141259f27">test_compute_padded_size</a></div><div class="ttdeci">static void test_compute_padded_size()</div><div class="ttdoc">Self-test implementations.</div><div class="ttdef"><b>Definition</b> <a href="../../d4/d08/sha256_8cpp_source.html#l00248">sha256.cpp:248</a></div></div>
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<p>Self-test implementations. </p>
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<dl class="section return"><dt>Returns</dt><dd>void </dd></dl>
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<p class="definition">Definition at line <a class="el" href="../../d4/d08/sha256_8cpp_source.html#l00248">248</a> of file <a class="el" href="../../d4/d08/sha256_8cpp_source.html">sha256.cpp</a>.</p>
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<div class="fragment"><div class="line"><span class="lineno"> 248</span> {</div>
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<div class="line"><span class="lineno"> 249</span> assert(<a class="code hl_function" href="#a28c1c6724dc6bcf91a39818699bbec27">hashing::sha256::compute_padded_size</a>(55) == 64);</div>
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<div class="line"><span class="lineno"> 250</span> assert(<a class="code hl_function" href="#a28c1c6724dc6bcf91a39818699bbec27">hashing::sha256::compute_padded_size</a>(56) == 128);</div>
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<div class="line"><span class="lineno"> 251</span> assert(<a class="code hl_function" href="#a28c1c6724dc6bcf91a39818699bbec27">hashing::sha256::compute_padded_size</a>(130) == 192);</div>
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<div class="line"><span class="lineno"> 252</span>}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a5afb183bc9072e33fed6c375ae6b7341">◆ </a></span>test_extract_byte()</h2>
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<p class="definition">Definition at line <a class="el" href="../../d4/d08/sha256_8cpp_source.html#l00254">254</a> of file <a class="el" href="../../d4/d08/sha256_8cpp_source.html">sha256.cpp</a>.</p>
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<div class="fragment"><div class="line"><span class="lineno"> 254</span> {</div>
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<div class="line"><span class="lineno"> 255</span> assert(<a class="code hl_function" href="#afea411191ec5281f43e91ea327984627">hashing::sha256::extract_byte<uint32_t></a>(512, 0) == 0);</div>
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<div class="line"><span class="lineno"> 256</span> assert(<a class="code hl_function" href="#afea411191ec5281f43e91ea327984627">hashing::sha256::extract_byte<uint32_t></a>(512, 1) == 2);</div>
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<div class="line"><span class="lineno"> 257</span> <span class="keywordtype">bool</span> exception = <span class="keyword">false</span>;</div>
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<div class="line"><span class="lineno"> 258</span> <span class="keywordflow">try</span> {</div>
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<div class="line"><span class="lineno"> 259</span> <a class="code hl_function" href="#afea411191ec5281f43e91ea327984627">hashing::sha256::extract_byte<uint32_t></a>(512, 5);</div>
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<div class="line"><span class="lineno"> 260</span> } <span class="keywordflow">catch</span> (<span class="keyword">const</span> std::out_of_range &) {</div>
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<div class="line"><span class="lineno"> 261</span> exception = <span class="keyword">true</span>;</div>
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<div class="line"><span class="lineno"> 262</span> }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ad2776cb73ddf27e044f890b4a79ab947">◆ </a></span>test_get_char()</h2>
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<p class="definition">Definition at line <a class="el" href="../../d4/d08/sha256_8cpp_source.html#l00266">266</a> of file <a class="el" href="../../d4/d08/sha256_8cpp_source.html">sha256.cpp</a>.</p>
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<div class="fragment"><div class="line"><span class="lineno"> 266</span> {</div>
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<div class="line"><span class="lineno"> 267</span> assert(<a class="code hl_function" href="#a9e98c180d32b04aab6f767cb0c13e1da">hashing::sha256::get_char</a>(<span class="stringliteral">"test"</span>, 3) == <span class="charliteral">'t'</span>);</div>
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<div class="line"><span class="lineno"> 268</span> assert(<a class="code hl_function" href="#a9e98c180d32b04aab6f767cb0c13e1da">hashing::sha256::get_char</a>(<span class="stringliteral">"test"</span>, 4) == <span class="stringliteral">'\x80'</span>);</div>
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<div class="line"><span class="lineno"> 269</span> assert(<a class="code hl_function" href="#a9e98c180d32b04aab6f767cb0c13e1da">hashing::sha256::get_char</a>(<span class="stringliteral">"test"</span>, 5) == <span class="stringliteral">'\x00'</span>);</div>
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<div class="line"><span class="lineno"> 270</span> assert(<a class="code hl_function" href="#a9e98c180d32b04aab6f767cb0c13e1da">hashing::sha256::get_char</a>(<span class="stringliteral">"test"</span>, 63) == 32);</div>
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<div class="line"><span class="lineno"> 271</span> <span class="keywordtype">bool</span> exception = <span class="keyword">false</span>;</div>
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<div class="line"><span class="lineno"> 272</span> <span class="keywordflow">try</span> {</div>
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<div class="line"><span class="lineno"> 273</span> <a class="code hl_function" href="#a9e98c180d32b04aab6f767cb0c13e1da">hashing::sha256::get_char</a>(<span class="stringliteral">"test"</span>, 64);</div>
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<div class="line"><span class="lineno"> 274</span> } <span class="keywordflow">catch</span> (<span class="keyword">const</span> std::out_of_range &) {</div>
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<div class="line"><span class="lineno"> 276</span> }</div>
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<div class="line"><span class="lineno"> 277</span> assert(exception);</div>
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<div class="line"><span class="lineno"> 278</span>}</div>
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<div class="ttc" id="asha256_8cpp_html_a9e98c180d32b04aab6f767cb0c13e1da"><div class="ttname"><a href="#a9e98c180d32b04aab6f767cb0c13e1da">hashing::sha256::get_char</a></div><div class="ttdeci">char get_char(const std::string &input, std::size_t pos)</div><div class="ttdoc">Returns the character at pos after the input is padded.</div><div class="ttdef"><b>Definition</b> <a href="../../d4/d08/sha256_8cpp_source.html#l00170">sha256.cpp:170</a></div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a33eb7fad4a4b36804c881e0ee98effc1">◆ </a></span>test_right_rotate()</h2>
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<p class="definition">Definition at line <a class="el" href="../../d4/d08/sha256_8cpp_source.html#l00280">280</a> of file <a class="el" href="../../d4/d08/sha256_8cpp_source.html">sha256.cpp</a>.</p>
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<div class="line"><span class="lineno"> 281</span> assert(<a class="code hl_function" href="#adbcd504103c342a4da718f8fce6ff06c">hashing::sha256::right_rotate</a>(128, 3) == 16);</div>
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<div class="line"><span class="lineno"> 282</span> assert(<a class="code hl_function" href="#adbcd504103c342a4da718f8fce6ff06c">hashing::sha256::right_rotate</a>(1, 30) == 4);</div>
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<div class="line"><span class="lineno"> 283</span> assert(<a class="code hl_function" href="#adbcd504103c342a4da718f8fce6ff06c">hashing::sha256::right_rotate</a>(6, 30) == 24);</div>
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<div class="line"><span class="lineno"> 284</span>}</div>
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<div class="ttc" id="asha256_8cpp_html_adbcd504103c342a4da718f8fce6ff06c"><div class="ttname"><a href="#adbcd504103c342a4da718f8fce6ff06c">hashing::sha256::right_rotate</a></div><div class="ttdeci">uint32_t right_rotate(uint32_t n, size_t rotate)</div><div class="ttdoc">Rotates the bits of a 32-bit unsigned integer.</div><div class="ttdef"><b>Definition</b> <a href="../../d4/d08/sha256_8cpp_source.html#l00058">sha256.cpp:58</a></div></div>
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<p class="definition">Definition at line <a class="el" href="../../d4/d08/sha256_8cpp_source.html#l00286">286</a> of file <a class="el" href="../../d4/d08/sha256_8cpp_source.html">sha256.cpp</a>.</p>
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<div class="line"><span class="lineno"> 288</span> <span class="keyword">const</span> std::string input;</div>
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<div class="line"><span class="lineno"> 290</span> TestCase(std::string input, std::string expected_hash)</div>
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<div class="line"><span class="lineno"> 293</span> };</div>
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<div class="line"><span class="lineno"> 308</span> assert(<a class="code hl_function" href="#a55475649a2bb7aae15de0716a217f43a">hashing::sha256::sha256</a>(tc.input) == tc.expected_hash);</div>
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