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<div class="title">OFB.cpp</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (C) 2015 Southern Storm Software, Pty Ltd.</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * copy of this software and associated documentation files (the "Software"),</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * to deal in the Software without restriction, including without limitation</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * the rights to use, copy, modify, merge, publish, distribute, sublicense,</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * and/or sell copies of the Software, and to permit persons to whom the</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * Software is furnished to do so, subject to the following conditions:</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * The above copyright notice and this permission notice shall be included</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * in all copies or substantial portions of the Software.</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * DEALINGS IN THE SOFTWARE.</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include "OFB.h"</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include "Crypto.h"</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <string.h></span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div>
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<div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="classOFBCommon.html#a7f7e0cffcd7e2d7e06b7b1ae978a8f7d"> 42</a></span> <a class="code" href="classOFBCommon.html#a7f7e0cffcd7e2d7e06b7b1ae978a8f7d">OFBCommon::OFBCommon</a>()</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  : blockCipher(0)</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  , posn(16)</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> {</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> }</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div>
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<div class="line"><a name="l00051"></a><span class="lineno"><a class="line" href="classOFBCommon.html#aae7435157e51bf977d3481e94e17ae01"> 51</a></span> <a class="code" href="classOFBCommon.html#aae7435157e51bf977d3481e94e17ae01">OFBCommon::~OFBCommon</a>()</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> {</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  clean(iv);</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> }</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
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<div class="line"><a name="l00056"></a><span class="lineno"><a class="line" href="classOFBCommon.html#a76ea9f9ea9dd137778338813e534a8ce"> 56</a></span> <span class="keywordtype">size_t</span> <a class="code" href="classOFBCommon.html#a76ea9f9ea9dd137778338813e534a8ce">OFBCommon::keySize</a>()<span class="keyword"> const</span></div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="keyword"></span>{</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">return</span> blockCipher-><a class="code" href="classBlockCipher.html#afde6004a859e015d877eab3c37042a0f">keySize</a>();</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> }</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> </div>
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<div class="line"><a name="l00061"></a><span class="lineno"><a class="line" href="classOFBCommon.html#a67b4639aaece17a796fcba3a2ce8b43c"> 61</a></span> <span class="keywordtype">size_t</span> <a class="code" href="classOFBCommon.html#a67b4639aaece17a796fcba3a2ce8b43c">OFBCommon::ivSize</a>()<span class="keyword"> const</span></div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="keyword"></span>{</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">return</span> 16;</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> }</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div>
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<div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="classOFBCommon.html#ac3a98e81d95ebc6c883baef5f4cfbefb"> 66</a></span> <span class="keywordtype">bool</span> <a class="code" href="classOFBCommon.html#ac3a98e81d95ebc6c883baef5f4cfbefb">OFBCommon::setKey</a>(<span class="keyword">const</span> uint8_t *key, <span class="keywordtype">size_t</span> len)</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> {</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="comment">// Verify the cipher's block size, just in case.</span></div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">if</span> (blockCipher-><a class="code" href="classBlockCipher.html#a7059a310487c128db034b0ce0ad425a0">blockSize</a>() != 16)</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="comment">// Set the key on the underlying block cipher.</span></div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">return</span> blockCipher-><a class="code" href="classBlockCipher.html#a9a05307664469777592799c8f77397c4">setKey</a>(key, len);</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> }</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> </div>
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<div class="line"><a name="l00076"></a><span class="lineno"><a class="line" href="classOFBCommon.html#a4a35364cf30d78f1968cc00803686caf"> 76</a></span> <span class="keywordtype">bool</span> <a class="code" href="classOFBCommon.html#a4a35364cf30d78f1968cc00803686caf">OFBCommon::setIV</a>(<span class="keyword">const</span> uint8_t *iv, <span class="keywordtype">size_t</span> len)</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> {</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">if</span> (len != 16)</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  memcpy(this->iv, iv, 16);</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  posn = 16;</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> }</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div>
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<div class="line"><a name="l00085"></a><span class="lineno"><a class="line" href="classOFBCommon.html#a984d81a460e0799895b19dc48c3b5cf8"> 85</a></span> <span class="keywordtype">void</span> <a class="code" href="classOFBCommon.html#a984d81a460e0799895b19dc48c3b5cf8">OFBCommon::encrypt</a>(uint8_t *output, <span class="keyword">const</span> uint8_t *input, <span class="keywordtype">size_t</span> len)</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> {</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  uint8_t size;</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">while</span> (len > 0) {</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">// If we have exhausted the current keystream block, then encrypt</span></div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="comment">// the IV/ciphertext to get another keystream block.</span></div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordflow">if</span> (posn >= 16) {</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  blockCipher-><a class="code" href="classBlockCipher.html#aed0788b25f6bb2f1bd47d5a5f0c5db33">encryptBlock</a>(iv, iv);</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  posn = 0;</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  }</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> </div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="comment">// XOR the plaintext with the encrypted IV to get the new ciphertext.</span></div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  size = 16 - posn;</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">if</span> (size > len)</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  size = len;</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  len -= size;</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">while</span> (size > 0) {</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  *output++ = *input++ ^ iv[posn++];</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  --size;</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  }</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  }</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> }</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div>
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<div class="line"><a name="l00108"></a><span class="lineno"><a class="line" href="classOFBCommon.html#aeb3636d7175b150e2bf16367e51c2e36"> 108</a></span> <span class="keywordtype">void</span> <a class="code" href="classOFBCommon.html#aeb3636d7175b150e2bf16367e51c2e36">OFBCommon::decrypt</a>(uint8_t *output, <span class="keyword">const</span> uint8_t *input, <span class="keywordtype">size_t</span> len)</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> {</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <a class="code" href="classOFBCommon.html#a984d81a460e0799895b19dc48c3b5cf8">encrypt</a>(output, input, len);</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> }</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div>
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<div class="line"><a name="l00113"></a><span class="lineno"><a class="line" href="classOFBCommon.html#a55bf2396beb91c457bfc4c20ef5c8123"> 113</a></span> <span class="keywordtype">void</span> <a class="code" href="classOFBCommon.html#a55bf2396beb91c457bfc4c20ef5c8123">OFBCommon::clear</a>()</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> {</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  blockCipher-><a class="code" href="classBlockCipher.html#a6f27d46e9dfa7761d014d828ad5f955b">clear</a>();</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  clean(iv);</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  posn = 16;</div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> }</div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> </div>
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<div class="ttc" id="classOFBCommon_html_a55bf2396beb91c457bfc4c20ef5c8123"><div class="ttname"><a href="classOFBCommon.html#a55bf2396beb91c457bfc4c20ef5c8123">OFBCommon::clear</a></div><div class="ttdeci">void clear()</div><div class="ttdoc">Clears all security-sensitive state from this cipher. </div><div class="ttdef"><b>Definition:</b> <a href="OFB_8cpp_source.html#l00113">OFB.cpp:113</a></div></div>
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<div class="ttc" id="classOFBCommon_html_ac3a98e81d95ebc6c883baef5f4cfbefb"><div class="ttname"><a href="classOFBCommon.html#ac3a98e81d95ebc6c883baef5f4cfbefb">OFBCommon::setKey</a></div><div class="ttdeci">bool setKey(const uint8_t *key, size_t len)</div><div class="ttdoc">Sets the key to use for future encryption and decryption operations. </div><div class="ttdef"><b>Definition:</b> <a href="OFB_8cpp_source.html#l00066">OFB.cpp:66</a></div></div>
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<div class="ttc" id="classBlockCipher_html_aed0788b25f6bb2f1bd47d5a5f0c5db33"><div class="ttname"><a href="classBlockCipher.html#aed0788b25f6bb2f1bd47d5a5f0c5db33">BlockCipher::encryptBlock</a></div><div class="ttdeci">virtual void encryptBlock(uint8_t *output, const uint8_t *input)=0</div><div class="ttdoc">Encrypts a single block using this cipher. </div></div>
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<div class="ttc" id="classOFBCommon_html_a7f7e0cffcd7e2d7e06b7b1ae978a8f7d"><div class="ttname"><a href="classOFBCommon.html#a7f7e0cffcd7e2d7e06b7b1ae978a8f7d">OFBCommon::OFBCommon</a></div><div class="ttdeci">OFBCommon()</div><div class="ttdoc">Constructs a new cipher in OFB mode. </div><div class="ttdef"><b>Definition:</b> <a href="OFB_8cpp_source.html#l00042">OFB.cpp:42</a></div></div>
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<div class="ttc" id="classOFBCommon_html_a984d81a460e0799895b19dc48c3b5cf8"><div class="ttname"><a href="classOFBCommon.html#a984d81a460e0799895b19dc48c3b5cf8">OFBCommon::encrypt</a></div><div class="ttdeci">void encrypt(uint8_t *output, const uint8_t *input, size_t len)</div><div class="ttdoc">Encrypts an input buffer and writes the ciphertext to an output buffer. </div><div class="ttdef"><b>Definition:</b> <a href="OFB_8cpp_source.html#l00085">OFB.cpp:85</a></div></div>
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<div class="ttc" id="classBlockCipher_html_a9a05307664469777592799c8f77397c4"><div class="ttname"><a href="classBlockCipher.html#a9a05307664469777592799c8f77397c4">BlockCipher::setKey</a></div><div class="ttdeci">virtual bool setKey(const uint8_t *key, size_t len)=0</div><div class="ttdoc">Sets the key to use for future encryption and decryption operations. </div></div>
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<div class="ttc" id="classOFBCommon_html_aeb3636d7175b150e2bf16367e51c2e36"><div class="ttname"><a href="classOFBCommon.html#aeb3636d7175b150e2bf16367e51c2e36">OFBCommon::decrypt</a></div><div class="ttdeci">void decrypt(uint8_t *output, const uint8_t *input, size_t len)</div><div class="ttdoc">Decrypts an input buffer and writes the plaintext to an output buffer. </div><div class="ttdef"><b>Definition:</b> <a href="OFB_8cpp_source.html#l00108">OFB.cpp:108</a></div></div>
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<div class="ttc" id="classOFBCommon_html_a76ea9f9ea9dd137778338813e534a8ce"><div class="ttname"><a href="classOFBCommon.html#a76ea9f9ea9dd137778338813e534a8ce">OFBCommon::keySize</a></div><div class="ttdeci">size_t keySize() const </div><div class="ttdoc">Default size of the key for this cipher, in bytes. </div><div class="ttdef"><b>Definition:</b> <a href="OFB_8cpp_source.html#l00056">OFB.cpp:56</a></div></div>
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<div class="ttc" id="classBlockCipher_html_a6f27d46e9dfa7761d014d828ad5f955b"><div class="ttname"><a href="classBlockCipher.html#a6f27d46e9dfa7761d014d828ad5f955b">BlockCipher::clear</a></div><div class="ttdeci">virtual void clear()=0</div><div class="ttdoc">Clears all security-sensitive state from this block cipher. </div></div>
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<div class="ttc" id="classOFBCommon_html_a4a35364cf30d78f1968cc00803686caf"><div class="ttname"><a href="classOFBCommon.html#a4a35364cf30d78f1968cc00803686caf">OFBCommon::setIV</a></div><div class="ttdeci">bool setIV(const uint8_t *iv, size_t len)</div><div class="ttdoc">Sets the initialization vector to use for future encryption and decryption operations. </div><div class="ttdef"><b>Definition:</b> <a href="OFB_8cpp_source.html#l00076">OFB.cpp:76</a></div></div>
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<div class="ttc" id="classBlockCipher_html_a7059a310487c128db034b0ce0ad425a0"><div class="ttname"><a href="classBlockCipher.html#a7059a310487c128db034b0ce0ad425a0">BlockCipher::blockSize</a></div><div class="ttdeci">virtual size_t blockSize() const =0</div><div class="ttdoc">Size of a single block processed by this cipher, in bytes. </div></div>
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<div class="ttc" id="classBlockCipher_html_afde6004a859e015d877eab3c37042a0f"><div class="ttname"><a href="classBlockCipher.html#afde6004a859e015d877eab3c37042a0f">BlockCipher::keySize</a></div><div class="ttdeci">virtual size_t keySize() const =0</div><div class="ttdoc">Default size of the key for this block cipher, in bytes. </div></div>
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<div class="ttc" id="classOFBCommon_html_aae7435157e51bf977d3481e94e17ae01"><div class="ttname"><a href="classOFBCommon.html#aae7435157e51bf977d3481e94e17ae01">OFBCommon::~OFBCommon</a></div><div class="ttdeci">virtual ~OFBCommon()</div><div class="ttdoc">Destroys this cipher object after clearing sensitive information. </div><div class="ttdef"><b>Definition:</b> <a href="OFB_8cpp_source.html#l00051">OFB.cpp:51</a></div></div>
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<div class="ttc" id="classOFBCommon_html_a67b4639aaece17a796fcba3a2ce8b43c"><div class="ttname"><a href="classOFBCommon.html#a67b4639aaece17a796fcba3a2ce8b43c">OFBCommon::ivSize</a></div><div class="ttdeci">size_t ivSize() const </div><div class="ttdoc">Size of the initialization vector for this cipher, in bytes. </div><div class="ttdef"><b>Definition:</b> <a href="OFB_8cpp_source.html#l00061">OFB.cpp:61</a></div></div>
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