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<div class="title">RNG.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 "RNG.h"</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include "NoiseSource.h"</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include "ChaCha.h"</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include "Crypto.h"</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include "utility/ProgMemUtil.h"</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include <Arduino.h></span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include <avr/eeprom.h></span></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include <string.h></span></div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <a class="code" href="classRNGClass.html">RNGClass</a> RNG;</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="l00124"></a><span class="lineno"> 124</span> <span class="comment">// Number of ChaCha hash rounds to use for random number generation.</span></div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="preprocessor">#define RNG_ROUNDS 20</span></div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment">// Force a rekey after this many blocks of random data.</span></div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="preprocessor">#define RNG_REKEY_BLOCKS 16</span></div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment">// Maximum entropy credit that can be contained in the pool.</span></div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="preprocessor">#define RNG_MAX_CREDITS 384</span></div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment">// Tag for 256-bit ChaCha20 keys. This will always appear in the</span></div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment">// first 16 bytes of the block. The remaining 48 bytes are the seed.</span></div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> tagRNG[16] PROGMEM = {</div>
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="charliteral">'e'</span>, <span class="charliteral">'x'</span>, <span class="charliteral">'p'</span>, <span class="charliteral">'a'</span>, <span class="charliteral">'n'</span>, <span class="charliteral">'d'</span>, <span class="charliteral">' '</span>, <span class="charliteral">'3'</span>,</div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="charliteral">'2'</span>, <span class="charliteral">'-'</span>, <span class="charliteral">'b'</span>, <span class="charliteral">'y'</span>, <span class="charliteral">'t'</span>, <span class="charliteral">'e'</span>, <span class="charliteral">' '</span>, <span class="charliteral">'k'</span></div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> };</div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> </div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment">// Initialization seed. This is the ChaCha20 output of hashing</span></div>
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment">// "expand 32-byte k" followed by 48 bytes set to the numbers 1 to 48.</span></div>
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<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="comment">// The ChaCha20 output block is then truncated to the first 48 bytes.</span></div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="comment">// This value is intended to start the RNG in a semi-chaotic state if</span></div>
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment">// we don't have a previously saved seed in EEPROM.</span></div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t initRNG[48] PROGMEM = {</div>
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<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  0xB0, 0x2A, 0xAE, 0x7D, 0xEE, 0xCB, 0xBB, 0xB1,</div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  0xFC, 0x03, 0x6F, 0xDD, 0xDC, 0x7D, 0x76, 0x67,</div>
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  0x0C, 0xE8, 0x1F, 0x0D, 0xA3, 0xA0, 0xAA, 0x1E,</div>
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<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  0xB0, 0xBD, 0x72, 0x6B, 0x2B, 0x4C, 0x8A, 0x7E,</div>
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<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  0x34, 0xFC, 0x37, 0x60, 0xF4, 0x1E, 0x22, 0xA0,</div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  0x0B, 0xFB, 0x18, 0x84, 0x60, 0xA5, 0x77, 0x72</div>
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<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> };</div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> </div>
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<div class="line"><a name="l00167"></a><span class="lineno"><a class="line" href="classRNGClass.html#acbcf327242f51ae2d9209aeaa45e30e9"> 167</a></span> <a class="code" href="classRNGClass.html#acbcf327242f51ae2d9209aeaa45e30e9">RNGClass::RNGClass</a>()</div>
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<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  : address(0)</div>
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<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  , credits(0)</div>
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<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  , firstSave(1)</div>
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<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  , timer(0)</div>
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<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  , timeout(3600000UL) <span class="comment">// 1 hour in milliseconds</span></div>
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<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> {</div>
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<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> }</div>
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<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> </div>
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<div class="line"><a name="l00179"></a><span class="lineno"><a class="line" href="classRNGClass.html#aef3ee2fb14a39caf650dc90a0226dd31"> 179</a></span> <a class="code" href="classRNGClass.html#aef3ee2fb14a39caf650dc90a0226dd31">RNGClass::~RNGClass</a>()</div>
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<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> {</div>
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<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  clean(block);</div>
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<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  clean(stream);</div>
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<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> }</div>
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<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> </div>
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<div class="line"><a name="l00202"></a><span class="lineno"><a class="line" href="classRNGClass.html#a7f1aab3c324f8e8a424d683425e0fcf8"> 202</a></span> <span class="keywordtype">void</span> <a class="code" href="classRNGClass.html#a7f1aab3c324f8e8a424d683425e0fcf8">RNGClass::begin</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *tag, <span class="keywordtype">int</span> eepromAddress)</div>
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<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> {</div>
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<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="comment">// Save the EEPROM address for use by save().</span></div>
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<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  address = eepromAddress;</div>
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<div class="line"><a name="l00206"></a><span class="lineno"> 206</span> </div>
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<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="comment">// Initialize the ChaCha20 input block from the saved seed.</span></div>
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<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  memcpy_P(block, tagRNG, <span class="keyword">sizeof</span>(tagRNG));</div>
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<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  memcpy_P(block + 4, initRNG, <span class="keyword">sizeof</span>(initRNG));</div>
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<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keywordflow">if</span> (eeprom_read_byte((<span class="keyword">const</span> uint8_t *)address) == <span class="charliteral">'S'</span>) {</div>
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<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="comment">// We have a saved seed: XOR it with the initialization block.</span></div>
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<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> posn = 0; posn < 12; ++posn) {</div>
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<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  block[posn + 4] ^=</div>
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<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  eeprom_read_dword((<span class="keyword">const</span> uint32_t *)(address + posn * 4 + 1));</div>
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<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  }</div>
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<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  }</div>
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<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> </div>
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<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="comment">// No entropy credits for the saved seed.</span></div>
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<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  credits = 0;</div>
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<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> </div>
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<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="comment">// Trigger an automatic save once the entropy credits max out.</span></div>
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<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  firstSave = 1;</div>
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<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> </div>
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<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="comment">// Rekey the random number generator immediately.</span></div>
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<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  rekey();</div>
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<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> </div>
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<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="comment">// Stir in the supplied tag data but don't credit any entropy to it.</span></div>
|
|
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <span class="keywordflow">if</span> (tag)</div>
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<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <a class="code" href="classRNGClass.html#ad99535ea23ae2fec55bdebb8c24def02">stir</a>((<span class="keyword">const</span> uint8_t *)tag, strlen(tag));</div>
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|
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> </div>
|
|
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="comment">// Re-save the seed to obliterate the previous value and to ensure</span></div>
|
|
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="comment">// that if the system is reset without a call to save() that we won't</span></div>
|
|
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="comment">// accidentally generate the same sequence of random data again.</span></div>
|
|
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <a class="code" href="classRNGClass.html#a139584fb249148e2058d1d645d090db7">save</a>();</div>
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|
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> }</div>
|
|
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> </div>
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<div class="line"><a name="l00253"></a><span class="lineno"><a class="line" href="classRNGClass.html#a5848e87a5f2f0302c88b0377f0e3366d"> 253</a></span> <span class="keywordtype">void</span> <a class="code" href="classRNGClass.html#a5848e87a5f2f0302c88b0377f0e3366d">RNGClass::setAutoSaveTime</a>(uint16_t minutes)</div>
|
|
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> {</div>
|
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<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="keywordflow">if</span> (!minutes)</div>
|
|
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  minutes = 1; <span class="comment">// Just in case.</span></div>
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|
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  timeout = ((uint32_t)minutes) * 60000U;</div>
|
|
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> }</div>
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<div class="line"><a name="l00259"></a><span class="lineno"> 259</span> </div>
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<div class="line"><a name="l00277"></a><span class="lineno"><a class="line" href="classRNGClass.html#a418a833cf18198fd7e5d6dbd78c99c29"> 277</a></span> <span class="keywordtype">void</span> <a class="code" href="classRNGClass.html#a418a833cf18198fd7e5d6dbd78c99c29">RNGClass::rand</a>(uint8_t *data, <span class="keywordtype">size_t</span> len)</div>
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|
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span> {</div>
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<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="comment">// Decrease the amount of entropy in the pool.</span></div>
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|
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="keywordflow">if</span> (len > (credits / 8))</div>
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|
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  credits = 0;</div>
|
|
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="keywordflow">else</span></div>
|
|
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  credits -= len * 8;</div>
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|
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> </div>
|
|
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="comment">// Generate the random data.</span></div>
|
|
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  uint8_t count = 0;</div>
|
|
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="keywordflow">while</span> (len > 0) {</div>
|
|
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="comment">// Force a rekey if we have generated too many blocks in this request.</span></div>
|
|
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  <span class="keywordflow">if</span> (count >= RNG_REKEY_BLOCKS) {</div>
|
|
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  rekey();</div>
|
|
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  count = 1;</div>
|
|
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  ++count;</div>
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|
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  }</div>
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<div class="line"><a name="l00295"></a><span class="lineno"> 295</span> </div>
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<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  <span class="comment">// Increment the low counter word and generate a new keystream block.</span></div>
|
|
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  ++(block[12]);</div>
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<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <a class="code" href="classChaCha.html#a41ac3262e52ff49dcd916d0b3b2e2038">ChaCha::hashCore</a>(stream, block, RNG_ROUNDS);</div>
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|
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span> </div>
|
|
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="comment">// Copy the data to the return buffer.</span></div>
|
|
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  <span class="keywordflow">if</span> (len < 64) {</div>
|
|
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  memcpy(data, stream, len);</div>
|
|
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="keywordflow">break</span>;</div>
|
|
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  memcpy(data, stream, 64);</div>
|
|
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  data += 64;</div>
|
|
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  len -= 64;</div>
|
|
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  }</div>
|
|
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  }</div>
|
|
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span> </div>
|
|
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  <span class="comment">// Force a rekey after every request.</span></div>
|
|
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  rekey();</div>
|
|
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> }</div>
|
|
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span> </div>
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<div class="line"><a name="l00354"></a><span class="lineno"><a class="line" href="classRNGClass.html#a49e3231ba65a5e4b045bc90976e0a659"> 354</a></span> <span class="keywordtype">bool</span> <a class="code" href="classRNGClass.html#a49e3231ba65a5e4b045bc90976e0a659">RNGClass::available</a>(<span class="keywordtype">size_t</span> len)<span class="keyword"> const</span></div>
|
|
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span> <span class="keyword"></span>{</div>
|
|
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  <span class="keywordflow">if</span> (len >= (RNG_MAX_CREDITS / 8))</div>
|
|
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <span class="keywordflow">return</span> credits >= RNG_MAX_CREDITS;</div>
|
|
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  <span class="keywordflow">else</span></div>
|
|
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  <span class="keywordflow">return</span> len <= (credits / 8);</div>
|
|
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span> }</div>
|
|
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span> </div>
|
|
<div class="line"><a name="l00387"></a><span class="lineno"><a class="line" href="classRNGClass.html#ad99535ea23ae2fec55bdebb8c24def02"> 387</a></span> <span class="keywordtype">void</span> <a class="code" href="classRNGClass.html#ad99535ea23ae2fec55bdebb8c24def02">RNGClass::stir</a>(<span class="keyword">const</span> uint8_t *data, <span class="keywordtype">size_t</span> len, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> credit)</div>
|
|
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span> {</div>
|
|
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  <span class="comment">// Increase the entropy credit.</span></div>
|
|
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  <span class="keywordflow">if</span> ((credit / 8) >= len)</div>
|
|
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  credit = len * 8;</div>
|
|
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  <span class="keywordflow">if</span> ((RNG_MAX_CREDITS - credits) > credit)</div>
|
|
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  credits += credit;</div>
|
|
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  <span class="keywordflow">else</span></div>
|
|
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  credits = RNG_MAX_CREDITS;</div>
|
|
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span> </div>
|
|
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  <span class="comment">// Process the supplied input data.</span></div>
|
|
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  <span class="keywordflow">if</span> (len > 0) {</div>
|
|
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  <span class="comment">// XOR the data with the ChaCha input block in 48 byte</span></div>
|
|
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  <span class="comment">// chunks and rekey the ChaCha cipher for each chunk to mix</span></div>
|
|
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  <span class="comment">// the data in. This should scatter any "true entropy" in</span></div>
|
|
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  <span class="comment">// the input across the entire block.</span></div>
|
|
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  <span class="keywordflow">while</span> (len > 0) {</div>
|
|
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  <span class="keywordtype">size_t</span> templen = len;</div>
|
|
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  <span class="keywordflow">if</span> (templen > 48)</div>
|
|
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  templen = 48;</div>
|
|
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  uint8_t *output = ((uint8_t *)block) + 16;</div>
|
|
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  len -= templen;</div>
|
|
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  <span class="keywordflow">while</span> (templen > 0) {</div>
|
|
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span>  *output++ ^= *data++;</div>
|
|
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  --templen;</div>
|
|
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  }</div>
|
|
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  rekey();</div>
|
|
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  }</div>
|
|
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  <span class="comment">// There was no input data, so just force a rekey so we</span></div>
|
|
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  <span class="comment">// get some mixing of the state even without new data.</span></div>
|
|
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  rekey();</div>
|
|
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  }</div>
|
|
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span> </div>
|
|
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  <span class="comment">// Save if this is the first time we have reached max entropy.</span></div>
|
|
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  <span class="comment">// This provides some protection if the system is powered off before</span></div>
|
|
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  <span class="comment">// the first auto-save timeout occurs.</span></div>
|
|
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  <span class="keywordflow">if</span> (firstSave && credits >= RNG_MAX_CREDITS) {</div>
|
|
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span>  firstSave = 0;</div>
|
|
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  <a class="code" href="classRNGClass.html#a139584fb249148e2058d1d645d090db7">save</a>();</div>
|
|
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  }</div>
|
|
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span> }</div>
|
|
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span> </div>
|
|
<div class="line"><a name="l00437"></a><span class="lineno"><a class="line" href="classRNGClass.html#a541e4118e2ed10617480bb9949f9c516"> 437</a></span> <span class="keywordtype">void</span> <a class="code" href="classRNGClass.html#ad99535ea23ae2fec55bdebb8c24def02">RNGClass::stir</a>(<a class="code" href="classNoiseSource.html">NoiseSource</a> &source)</div>
|
|
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span> {</div>
|
|
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  source.<a class="code" href="classNoiseSource.html#a7ce647815524fe84f562aca5256e12f3">stir</a>();</div>
|
|
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span> }</div>
|
|
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span> </div>
|
|
<div class="line"><a name="l00468"></a><span class="lineno"><a class="line" href="classRNGClass.html#a139584fb249148e2058d1d645d090db7"> 468</a></span> <span class="keywordtype">void</span> <a class="code" href="classRNGClass.html#a139584fb249148e2058d1d645d090db7">RNGClass::save</a>()</div>
|
|
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span> {</div>
|
|
<div class="line"><a name="l00470"></a><span class="lineno"> 470</span>  <span class="comment">// Generate random data from the current state and save</span></div>
|
|
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span>  <span class="comment">// that as the seed. Then force a rekey.</span></div>
|
|
<div class="line"><a name="l00472"></a><span class="lineno"> 472</span>  ++(block[12]);</div>
|
|
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  <a class="code" href="classChaCha.html#a41ac3262e52ff49dcd916d0b3b2e2038">ChaCha::hashCore</a>(stream, block, RNG_ROUNDS);</div>
|
|
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span>  eeprom_write_block(stream, (<span class="keywordtype">void</span> *)(address + 1), 48);</div>
|
|
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  eeprom_update_byte((uint8_t *)address, <span class="charliteral">'S'</span>);</div>
|
|
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  rekey();</div>
|
|
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span>  timer = millis();</div>
|
|
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span> }</div>
|
|
<div class="line"><a name="l00479"></a><span class="lineno"> 479</span> </div>
|
|
<div class="line"><a name="l00486"></a><span class="lineno"><a class="line" href="classRNGClass.html#a8cb91e39f0c4591de5bf98b1e2880b13"> 486</a></span> <span class="keywordtype">void</span> <a class="code" href="classRNGClass.html#a8cb91e39f0c4591de5bf98b1e2880b13">RNGClass::loop</a>()</div>
|
|
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span> {</div>
|
|
<div class="line"><a name="l00488"></a><span class="lineno"> 488</span>  <span class="comment">// Save the seed if the auto-save timer has expired.</span></div>
|
|
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  <span class="keywordflow">if</span> ((millis() - timer) >= timeout)</div>
|
|
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span>  <a class="code" href="classRNGClass.html#a139584fb249148e2058d1d645d090db7">save</a>();</div>
|
|
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span> }</div>
|
|
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span> </div>
|
|
<div class="line"><a name="l00513"></a><span class="lineno"><a class="line" href="classRNGClass.html#a9901367d86f2303a59bbc12fe91cad00"> 513</a></span> <span class="keywordtype">void</span> <a class="code" href="classRNGClass.html#a9901367d86f2303a59bbc12fe91cad00">RNGClass::destroy</a>()</div>
|
|
<div class="line"><a name="l00514"></a><span class="lineno"> 514</span> {</div>
|
|
<div class="line"><a name="l00515"></a><span class="lineno"> 515</span>  clean(block);</div>
|
|
<div class="line"><a name="l00516"></a><span class="lineno"> 516</span>  clean(stream);</div>
|
|
<div class="line"><a name="l00517"></a><span class="lineno"> 517</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> posn = 0; posn < <a class="code" href="classRNGClass.html#ae3a013bfc73795fd26ee36e70d89f4c2">SEED_SIZE</a>; ++posn)</div>
|
|
<div class="line"><a name="l00518"></a><span class="lineno"> 518</span>  eeprom_write_byte((uint8_t *)(address + posn), 0xFF);</div>
|
|
<div class="line"><a name="l00519"></a><span class="lineno"> 519</span> }</div>
|
|
<div class="line"><a name="l00520"></a><span class="lineno"> 520</span> </div>
|
|
<div class="line"><a name="l00524"></a><span class="lineno"> 524</span> <span class="keywordtype">void</span> RNGClass::rekey()</div>
|
|
<div class="line"><a name="l00525"></a><span class="lineno"> 525</span> {</div>
|
|
<div class="line"><a name="l00526"></a><span class="lineno"> 526</span>  <span class="comment">// Rekey the cipher for the next request by generating a new block.</span></div>
|
|
<div class="line"><a name="l00527"></a><span class="lineno"> 527</span>  <span class="comment">// This is intended to make it difficult to wind the random number</span></div>
|
|
<div class="line"><a name="l00528"></a><span class="lineno"> 528</span>  <span class="comment">// backwards if the state is captured later. The first 16 bytes of</span></div>
|
|
<div class="line"><a name="l00529"></a><span class="lineno"> 529</span>  <span class="comment">// "block" remain set to "tagRNG".</span></div>
|
|
<div class="line"><a name="l00530"></a><span class="lineno"> 530</span>  ++(block[12]);</div>
|
|
<div class="line"><a name="l00531"></a><span class="lineno"> 531</span>  <a class="code" href="classChaCha.html#a41ac3262e52ff49dcd916d0b3b2e2038">ChaCha::hashCore</a>(stream, block, RNG_ROUNDS);</div>
|
|
<div class="line"><a name="l00532"></a><span class="lineno"> 532</span>  memcpy(block + 4, stream, 48);</div>
|
|
<div class="line"><a name="l00533"></a><span class="lineno"> 533</span> </div>
|
|
<div class="line"><a name="l00534"></a><span class="lineno"> 534</span>  <span class="comment">// Permute the high word of the counter using the system microsecond</span></div>
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<div class="line"><a name="l00535"></a><span class="lineno"> 535</span>  <span class="comment">// counter to introduce a little bit of non-stir randomness for each</span></div>
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<div class="line"><a name="l00536"></a><span class="lineno"> 536</span>  <span class="comment">// request. Note: If random data is requested on a predictable schedule</span></div>
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<div class="line"><a name="l00537"></a><span class="lineno"> 537</span>  <span class="comment">// then this may not help very much. It is still necessary to stir in</span></div>
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<div class="line"><a name="l00538"></a><span class="lineno"> 538</span>  <span class="comment">// high quality entropy data on a regular basis using stir().</span></div>
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<div class="line"><a name="l00539"></a><span class="lineno"> 539</span>  block[13] ^= micros();</div>
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<div class="line"><a name="l00540"></a><span class="lineno"> 540</span> }</div>
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<div class="ttc" id="classRNGClass_html_a139584fb249148e2058d1d645d090db7"><div class="ttname"><a href="classRNGClass.html#a139584fb249148e2058d1d645d090db7">RNGClass::save</a></div><div class="ttdeci">void save()</div><div class="ttdoc">Saves the random seed to EEPROM. </div><div class="ttdef"><b>Definition:</b> <a href="RNG_8cpp_source.html#l00468">RNG.cpp:468</a></div></div>
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<div class="ttc" id="classRNGClass_html_a418a833cf18198fd7e5d6dbd78c99c29"><div class="ttname"><a href="classRNGClass.html#a418a833cf18198fd7e5d6dbd78c99c29">RNGClass::rand</a></div><div class="ttdeci">void rand(uint8_t *data, size_t len)</div><div class="ttdoc">Generates random bytes into a caller-supplied buffer. </div><div class="ttdef"><b>Definition:</b> <a href="RNG_8cpp_source.html#l00277">RNG.cpp:277</a></div></div>
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<div class="ttc" id="classRNGClass_html_a7f1aab3c324f8e8a424d683425e0fcf8"><div class="ttname"><a href="classRNGClass.html#a7f1aab3c324f8e8a424d683425e0fcf8">RNGClass::begin</a></div><div class="ttdeci">void begin(const char *tag, int eepromAddress)</div><div class="ttdoc">Initializes the random number generator. </div><div class="ttdef"><b>Definition:</b> <a href="RNG_8cpp_source.html#l00202">RNG.cpp:202</a></div></div>
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<div class="ttc" id="classNoiseSource_html_a7ce647815524fe84f562aca5256e12f3"><div class="ttname"><a href="classNoiseSource.html#a7ce647815524fe84f562aca5256e12f3">NoiseSource::stir</a></div><div class="ttdeci">virtual void stir()=0</div><div class="ttdoc">Stirs entropy from this noise source into the global random number pool. </div></div>
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<div class="ttc" id="classNoiseSource_html"><div class="ttname"><a href="classNoiseSource.html">NoiseSource</a></div><div class="ttdoc">Abstract base class for random noise sources. </div><div class="ttdef"><b>Definition:</b> <a href="NoiseSource_8h_source.html#l00029">NoiseSource.h:29</a></div></div>
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<div class="ttc" id="classRNGClass_html_aef3ee2fb14a39caf650dc90a0226dd31"><div class="ttname"><a href="classRNGClass.html#aef3ee2fb14a39caf650dc90a0226dd31">RNGClass::~RNGClass</a></div><div class="ttdeci">~RNGClass()</div><div class="ttdoc">Destroys this random number generator instance. </div><div class="ttdef"><b>Definition:</b> <a href="RNG_8cpp_source.html#l00179">RNG.cpp:179</a></div></div>
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<div class="ttc" id="classRNGClass_html_acbcf327242f51ae2d9209aeaa45e30e9"><div class="ttname"><a href="classRNGClass.html#acbcf327242f51ae2d9209aeaa45e30e9">RNGClass::RNGClass</a></div><div class="ttdeci">RNGClass()</div><div class="ttdoc">Constructs a new random number generator instance. </div><div class="ttdef"><b>Definition:</b> <a href="RNG_8cpp_source.html#l00167">RNG.cpp:167</a></div></div>
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<div class="ttc" id="classRNGClass_html_a9901367d86f2303a59bbc12fe91cad00"><div class="ttname"><a href="classRNGClass.html#a9901367d86f2303a59bbc12fe91cad00">RNGClass::destroy</a></div><div class="ttdeci">void destroy()</div><div class="ttdoc">Destroys the data in the random number pool and the saved seed in EEPROM. </div><div class="ttdef"><b>Definition:</b> <a href="RNG_8cpp_source.html#l00513">RNG.cpp:513</a></div></div>
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<div class="ttc" id="classRNGClass_html_a49e3231ba65a5e4b045bc90976e0a659"><div class="ttname"><a href="classRNGClass.html#a49e3231ba65a5e4b045bc90976e0a659">RNGClass::available</a></div><div class="ttdeci">bool available(size_t len) const </div><div class="ttdoc">Determine if there is sufficient entropy available for a specific request size. </div><div class="ttdef"><b>Definition:</b> <a href="RNG_8cpp_source.html#l00354">RNG.cpp:354</a></div></div>
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<div class="ttc" id="classRNGClass_html_a8cb91e39f0c4591de5bf98b1e2880b13"><div class="ttname"><a href="classRNGClass.html#a8cb91e39f0c4591de5bf98b1e2880b13">RNGClass::loop</a></div><div class="ttdeci">void loop()</div><div class="ttdoc">Run periodic housekeeping tasks on the random number generator. </div><div class="ttdef"><b>Definition:</b> <a href="RNG_8cpp_source.html#l00486">RNG.cpp:486</a></div></div>
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<div class="ttc" id="classRNGClass_html"><div class="ttname"><a href="classRNGClass.html">RNGClass</a></div><div class="ttdoc">Pseudo random number generator suitable for cryptography. </div><div class="ttdef"><b>Definition:</b> <a href="RNG_8h_source.html#l00031">RNG.h:31</a></div></div>
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<div class="ttc" id="classRNGClass_html_ae3a013bfc73795fd26ee36e70d89f4c2"><div class="ttname"><a href="classRNGClass.html#ae3a013bfc73795fd26ee36e70d89f4c2">RNGClass::SEED_SIZE</a></div><div class="ttdeci">static const int SEED_SIZE</div><div class="ttdoc">Size of a saved random number seed in EEPROM space. </div><div class="ttdef"><b>Definition:</b> <a href="RNG_8h_source.html#l00053">RNG.h:53</a></div></div>
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<div class="ttc" id="classChaCha_html_a41ac3262e52ff49dcd916d0b3b2e2038"><div class="ttname"><a href="classChaCha.html#a41ac3262e52ff49dcd916d0b3b2e2038">ChaCha::hashCore</a></div><div class="ttdeci">static void hashCore(uint32_t *output, const uint32_t *input, uint8_t rounds)</div><div class="ttdoc">Executes the ChaCha hash core on an input memory block. </div><div class="ttdef"><b>Definition:</b> <a href="ChaCha_8cpp_source.html#l00230">ChaCha.cpp:230</a></div></div>
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<div class="ttc" id="classRNGClass_html_ad99535ea23ae2fec55bdebb8c24def02"><div class="ttname"><a href="classRNGClass.html#ad99535ea23ae2fec55bdebb8c24def02">RNGClass::stir</a></div><div class="ttdeci">void stir(const uint8_t *data, size_t len, unsigned int credit=0)</div><div class="ttdoc">Stirs additional entropy data into the random pool. </div><div class="ttdef"><b>Definition:</b> <a href="RNG_8cpp_source.html#l00387">RNG.cpp:387</a></div></div>
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<div class="ttc" id="classRNGClass_html_a5848e87a5f2f0302c88b0377f0e3366d"><div class="ttname"><a href="classRNGClass.html#a5848e87a5f2f0302c88b0377f0e3366d">RNGClass::setAutoSaveTime</a></div><div class="ttdeci">void setAutoSaveTime(uint16_t minutes)</div><div class="ttdoc">Sets the amount of time between automatic seed saves. </div><div class="ttdef"><b>Definition:</b> <a href="RNG_8cpp_source.html#l00253">RNG.cpp:253</a></div></div>
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