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<p>Implementation of <a href="https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher" target="_blank">Vigenère cipher</a> algorithm.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;iostream&gt;</code><br />
<code>#include &lt;string&gt;</code><br />
<code>#include &lt;cassert&gt;</code><br />
</div><div class="textblock"><div class="dynheader">
Include dependency graph for vigenere_cipher.cpp:</div>
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<p><a href="../../dd/d12/vigenere__cipher_8cpp_source.html">Go to the source code of this file.</a></p>
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<tr class="heading"><td colspan="2"><h2 id="header-namespaces" class="groupheader"><a id="namespaces" name="namespaces"></a>
Namespaces</h2></td></tr>
<tr class="memitem:ciphers" id="r_ciphers"><td class="memItemLeft" align="right" valign="top">namespace &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d6/d4e/namespaceciphers.html">ciphers</a></td></tr>
<tr class="memdesc:d6/d4e/namespaceciphers"><td class="mdescLeft">&#160;</td><td class="mdescRight">Algorithms for encryption and decryption. <br /></td></tr>
<tr class="memitem:vigenere" id="r_vigenere"><td class="memItemLeft" align="right" valign="top">namespace &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d6/da2/namespacevigenere.html">vigenere</a></td></tr>
<tr class="memdesc:d6/da2/namespacevigenere"><td class="mdescLeft">&#160;</td><td class="mdescRight">Functions for <a href="https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher" target="_blank">vigenère cipher</a> algorithm. <br /></td></tr>
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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>
Functions</h2></td></tr>
<tr class="memitem:a6bd3880ea6820c232c1eddf47553c257" id="r_a6bd3880ea6820c232c1eddf47553c257"><td class="memItemLeft" align="right" valign="top">std::string&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a6bd3880ea6820c232c1eddf47553c257">ciphers::vigenere::encrypt</a> (const std::string &amp;text, const std::string &amp;key)</td></tr>
<tr class="memitem:a3cfc3f9b20a0f230a2fcefd31dc6848e" id="r_a3cfc3f9b20a0f230a2fcefd31dc6848e"><td class="memItemLeft" align="right" valign="top">std::string&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a3cfc3f9b20a0f230a2fcefd31dc6848e">ciphers::vigenere::decrypt</a> (const std::string &amp;text, const std::string &amp;key)</td></tr>
<tr class="memitem:ae1a3968e7947464bee7714f6d43b7002" id="r_ae1a3968e7947464bee7714f6d43b7002"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#ae1a3968e7947464bee7714f6d43b7002">test</a> ()</td></tr>
<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4" id="r_ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
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<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Implementation of <a href="https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher" target="_blank">Vigenère cipher</a> algorithm. </p>
<p>The Vigenère cipher is a method of encrypting alphabetic text by using a series of interwoven vigenere ciphers, based on the letters of a keyword. It employs a form of polyalphabetic substitution.</p>
<h3 class="doxsection"><a class="anchor" id="autotoc_md2"></a>
Algorithm</h3>
<p>The encryption can also be represented using modular arithmetic by first transforming the letters into numbers, according to the scheme, A → 0, B → 1, ..., Z → 25. Encryption of \(i^{th}\) character in Message M by key K can be described mathematically as,</p>
<p class="formulaDsp">
\[ E_{K}(M_{i}) = (M_{i} + K_{i})\;\mbox{mod}\; 26\]
</p>
<p>while decryption of \(i^{th}\) character in Cipher C by key K can be described mathematically as,</p>
<p class="formulaDsp">
\[ D_{k}(C_{i}) = (C_{i} - K_{i} + 26)\;\mbox{mod}\; 26\]
</p>
<p>Where \(K_{i}\) denotes corresponding character in key. If \(|key| &lt; |text|\) than same key is repeated untill their lengths are equal.</p>
<p>For Example, If M = "ATTACKATDAWN" and K = "LEMON" than K becomes "LEMONLEMONLE".</p>
<dl class="section note"><dt>Note</dt><dd>Rather than creating new key of equal length this program does this by using modular index for key (i.e. \((j + 1) \;\mbox{mod}\; |\mbox{key}|\))</dd>
<dd>
This program implements Vigenère cipher for only uppercase English alphabet characters (i.e. A-Z).</dd></dl>
<dl class="section author"><dt>Author</dt><dd><a href="https://github.com/imdeep2905" target="_blank">Deep Raval</a> </dd></dl>
<p class="definition">Definition in file <a class="el" href="../../dd/d12/vigenere__cipher_8cpp_source.html">vigenere_cipher.cpp</a>.</p>
</div><a name="doc-func-members" id="doc-func-members"></a><h2 id="header-doc-func-members" class="groupheader">Function Documentation</h2>
<a id="a3cfc3f9b20a0f230a2fcefd31dc6848e" name="a3cfc3f9b20a0f230a2fcefd31dc6848e"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a3cfc3f9b20a0f230a2fcefd31dc6848e">&#9670;&#160;</a></span>decrypt()</h2>
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<td class="memname">std::string ciphers::vigenere::decrypt </td>
<td>(</td>
<td class="paramtype">const std::string &amp;</td> <td class="paramname"><span class="paramname"><em>text</em></span>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">const std::string &amp;</td> <td class="paramname"><span class="paramname"><em>key</em></span>&#160;)</td>
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<p>Decrypt given text using vigenere cipher. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">text</td><td>text to be decrypted </td></tr>
<tr><td class="paramname">key</td><td>key to be used for decryption </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>new decrypted text </dd></dl>
<p class="definition">Definition at line <a class="el" href="../../dd/d12/vigenere__cipher_8cpp_source.html#l00092">92</a> of file <a class="el" href="../../dd/d12/vigenere__cipher_8cpp_source.html">vigenere_cipher.cpp</a>.</p>
<div class="fragment"><div class="line"><span class="lineno"> 92</span> {</div>
<div class="line"><span class="lineno"> 93</span> <span class="comment">// Going through each character of text and key</span></div>
<div class="line"><span class="lineno"> 94</span> <span class="comment">// Note that key is visited in circular way hence j = (j + 1) % |key|</span></div>
<div class="line"><span class="lineno"> 95</span> std::string decrypted_text = <span class="stringliteral">&quot;&quot;</span>; <span class="comment">// Empty string to store decrypted text</span></div>
<div class="line"><span class="lineno"> 96</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = 0, j = 0; i &lt; text.length(); i++, j = (j + 1) % key.length()) {</div>
<div class="line"><span class="lineno"> 97</span> <span class="keywordtype">int</span> place_value_text = get_value(text[i]); <span class="comment">// Getting value of character in text</span></div>
<div class="line"><span class="lineno"> 98</span> <span class="keywordtype">int</span> place_value_key = get_value(key[j]); <span class="comment">// Getting value of character in key</span></div>
<div class="line"><span class="lineno"> 99</span> place_value_text = (place_value_text - place_value_key + 26) % 26; <span class="comment">// Applying decryption</span></div>
<div class="line"><span class="lineno"> 100</span> <span class="keywordtype">char</span> decrypted_char = get_char(place_value_text); <span class="comment">// Getting new character from decrypted value</span></div>
<div class="line"><span class="lineno"> 101</span> decrypted_text += decrypted_char; <span class="comment">// Appending decrypted character</span></div>
<div class="line"><span class="lineno"> 102</span> } </div>
<div class="line"><span class="lineno"> 103</span> <span class="keywordflow">return</span> decrypted_text; <span class="comment">// Returning decrypted text</span></div>
<div class="line"><span class="lineno"> 104</span> }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a6bd3880ea6820c232c1eddf47553c257">&#9670;&#160;</a></span>encrypt()</h2>
<div class="memitem">
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<table class="memname">
<tr>
<td class="memname">std::string ciphers::vigenere::encrypt </td>
<td>(</td>
<td class="paramtype">const std::string &amp;</td> <td class="paramname"><span class="paramname"><em>text</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const std::string &amp;</td> <td class="paramname"><span class="paramname"><em>key</em></span>&#160;)</td>
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</div><div class="memdoc">
<p>Encrypt given text using vigenere cipher. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">text</td><td>text to be encrypted </td></tr>
<tr><td class="paramname">key</td><td>to be used for encryption </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>new encrypted text </dd></dl>
<p class="definition">Definition at line <a class="el" href="../../dd/d12/vigenere__cipher_8cpp_source.html#l00073">73</a> of file <a class="el" href="../../dd/d12/vigenere__cipher_8cpp_source.html">vigenere_cipher.cpp</a>.</p>
<div class="fragment"><div class="line"><span class="lineno"> 73</span> {</div>
<div class="line"><span class="lineno"> 74</span> std::string encrypted_text = <span class="stringliteral">&quot;&quot;</span>; <span class="comment">// Empty string to store encrypted text</span></div>
<div class="line"><span class="lineno"> 75</span> <span class="comment">// Going through each character of text and key</span></div>
<div class="line"><span class="lineno"> 76</span> <span class="comment">// Note that key is visited in circular way hence j = (j + 1) % |key|</span></div>
<div class="line"><span class="lineno"> 77</span> <span class="keywordflow">for</span>(<span class="keywordtype">size_t</span> i = 0, j = 0; i &lt; text.length(); i++, j = (j + 1) % key.length()) {</div>
<div class="line"><span class="lineno"> 78</span> <span class="keywordtype">int</span> place_value_text = get_value(text[i]); <span class="comment">// Getting value of character in text</span></div>
<div class="line"><span class="lineno"> 79</span> <span class="keywordtype">int</span> place_value_key = get_value(key[j]); <span class="comment">// Getting value of character in key</span></div>
<div class="line"><span class="lineno"> 80</span> place_value_text = (place_value_text + place_value_key) % 26; <span class="comment">// Applying encryption</span></div>
<div class="line"><span class="lineno"> 81</span> <span class="keywordtype">char</span> encrypted_char = get_char(place_value_text); <span class="comment">// Getting new character from encrypted value</span></div>
<div class="line"><span class="lineno"> 82</span> encrypted_text += encrypted_char; <span class="comment">// Appending encrypted character</span></div>
<div class="line"><span class="lineno"> 83</span> }</div>
<div class="line"><span class="lineno"> 84</span> <span class="keywordflow">return</span> encrypted_text; <span class="comment">// Returning encrypted text</span></div>
<div class="line"><span class="lineno"> 85</span> }</div>
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<a id="ae66f6b31b5ad750f1fe042a706a4e3d4" name="ae66f6b31b5ad750f1fe042a706a4e3d4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">&#9670;&#160;</a></span>main()</h2>
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<td class="memname">int main </td>
<td>(</td>
<td class="paramtype">void</td> <td class="paramname"><span class="paramname"><em></em></span></td><td>)</td>
<td></td>
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<p>Driver Code </p>
<p class="definition">Definition at line <a class="el" href="../../dd/d12/vigenere__cipher_8cpp_source.html#l00131">131</a> of file <a class="el" href="../../dd/d12/vigenere__cipher_8cpp_source.html">vigenere_cipher.cpp</a>.</p>
<div class="fragment"><div class="line"><span class="lineno"> 131</span> {</div>
<div class="line"><span class="lineno"> 132</span> <span class="comment">// Testing</span></div>
<div class="line"><span class="lineno"> 133</span> <a class="code hl_function" href="#ae1a3968e7947464bee7714f6d43b7002">test</a>();</div>
<div class="line"><span class="lineno"> 134</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><span class="lineno"> 135</span>}</div>
<div class="ttc" id="avigenere__cipher_8cpp_html_ae1a3968e7947464bee7714f6d43b7002"><div class="ttname"><a href="#ae1a3968e7947464bee7714f6d43b7002">test</a></div><div class="ttdeci">void test()</div><div class="ttdef"><b>Definition</b> <a href="../../dd/d12/vigenere__cipher_8cpp_source.html#l00111">vigenere_cipher.cpp:111</a></div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#ae1a3968e7947464bee7714f6d43b7002">&#9670;&#160;</a></span>test()</h2>
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<td class="memname">void test </td>
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<td class="paramname"><span class="paramname"><em></em></span></td><td>)</td>
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<p>Function to test above algorithm </p>
<p class="definition">Definition at line <a class="el" href="../../dd/d12/vigenere__cipher_8cpp_source.html#l00111">111</a> of file <a class="el" href="../../dd/d12/vigenere__cipher_8cpp_source.html">vigenere_cipher.cpp</a>.</p>
<div class="fragment"><div class="line"><span class="lineno"> 111</span> {</div>
<div class="line"><span class="lineno"> 112</span> <span class="comment">// Test 1</span></div>
<div class="line"><span class="lineno"> 113</span> std::string text1 = <span class="stringliteral">&quot;NIKOLATESLA&quot;</span>;</div>
<div class="line"><span class="lineno"> 114</span> std::string encrypted1 = <a class="code hl_function" href="#a6bd3880ea6820c232c1eddf47553c257">ciphers::vigenere::encrypt</a>(text1, <span class="stringliteral">&quot;TESLA&quot;</span>);</div>
<div class="line"><span class="lineno"> 115</span> std::string decrypted1 = <a class="code hl_function" href="#a3cfc3f9b20a0f230a2fcefd31dc6848e">ciphers::vigenere::decrypt</a>(encrypted1, <span class="stringliteral">&quot;TESLA&quot;</span>);</div>
<div class="line"><span class="lineno"> 116</span> assert(text1 == decrypted1);</div>
<div class="line"><span class="lineno"> 117</span> std::cout &lt;&lt; <span class="stringliteral">&quot;Original text : &quot;</span> &lt;&lt; text1;</div>
<div class="line"><span class="lineno"> 118</span> std::cout &lt;&lt; <span class="stringliteral">&quot; , Encrypted text (with key = TESLA) : &quot;</span> &lt;&lt; encrypted1;</div>
<div class="line"><span class="lineno"> 119</span> std::cout &lt;&lt; <span class="stringliteral">&quot; , Decrypted text : &quot;</span>&lt;&lt; decrypted1 &lt;&lt; std::endl;</div>
<div class="line"><span class="lineno"> 120</span> <span class="comment">// Test 2</span></div>
<div class="line"><span class="lineno"> 121</span> std::string text2 = <span class="stringliteral">&quot;GOOGLEIT&quot;</span>;</div>
<div class="line"><span class="lineno"> 122</span> std::string encrypted2 = <a class="code hl_function" href="#a6bd3880ea6820c232c1eddf47553c257">ciphers::vigenere::encrypt</a>(text2, <span class="stringliteral">&quot;REALLY&quot;</span>);</div>
<div class="line"><span class="lineno"> 123</span> std::string decrypted2 = <a class="code hl_function" href="#a3cfc3f9b20a0f230a2fcefd31dc6848e">ciphers::vigenere::decrypt</a>(encrypted2, <span class="stringliteral">&quot;REALLY&quot;</span>);</div>
<div class="line"><span class="lineno"> 124</span> assert(text2 == decrypted2);</div>
<div class="line"><span class="lineno"> 125</span> std::cout &lt;&lt; <span class="stringliteral">&quot;Original text : &quot;</span> &lt;&lt; text2;</div>
<div class="line"><span class="lineno"> 126</span> std::cout &lt;&lt; <span class="stringliteral">&quot; , Encrypted text (with key = REALLY) : &quot;</span> &lt;&lt; encrypted2;</div>
<div class="line"><span class="lineno"> 127</span> std::cout &lt;&lt; <span class="stringliteral">&quot; , Decrypted text : &quot;</span>&lt;&lt; decrypted2 &lt;&lt; std::endl;</div>
<div class="line"><span class="lineno"> 128</span>}</div>
<div class="ttc" id="avigenere__cipher_8cpp_html_a3cfc3f9b20a0f230a2fcefd31dc6848e"><div class="ttname"><a href="#a3cfc3f9b20a0f230a2fcefd31dc6848e">ciphers::vigenere::decrypt</a></div><div class="ttdeci">std::string decrypt(const std::string &amp;text, const std::string &amp;key)</div><div class="ttdef"><b>Definition</b> <a href="../../dd/d12/vigenere__cipher_8cpp_source.html#l00092">vigenere_cipher.cpp:92</a></div></div>
<div class="ttc" id="avigenere__cipher_8cpp_html_a6bd3880ea6820c232c1eddf47553c257"><div class="ttname"><a href="#a6bd3880ea6820c232c1eddf47553c257">ciphers::vigenere::encrypt</a></div><div class="ttdeci">std::string encrypt(const std::string &amp;text, const std::string &amp;key)</div><div class="ttdef"><b>Definition</b> <a href="../../dd/d12/vigenere__cipher_8cpp_source.html#l00073">vigenere_cipher.cpp:73</a></div></div>
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