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Update docs
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Rhys Weatherley
@@ -167,7 +167,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div>
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<div class="line"><a name="l00111"></a><span class="lineno"><a class="line" href="classChaCha.html#a734f3246b1e6810c63637b8cda26b259"> 111</a></span> <span class="keywordtype">bool</span> <a class="code" href="classChaCha.html#a734f3246b1e6810c63637b8cda26b259">ChaCha::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="l00112"></a><span class="lineno"> 112</span> {</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="comment">// From draft-nir-cfrg-chacha20-poly1305-04.txt, we can use either</span></div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="comment">// From draft-nir-cfrg-chacha20-poly1305-10.txt, we can use either</span></div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="comment">// 64-bit or 96-bit nonces. The 96-bit nonce consists of the high</span></div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="comment">// word of the counter prepended to a regular 64-bit nonce for ChaCha.</span></div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">if</span> (len == 8) {</div>
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@@ -235,58 +235,69 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
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<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <a class="code" href="classChaCha.html#acd4fff140b8871c233d9a31abf753ed8">encrypt</a>(output, input, len);</div>
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<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> }</div>
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<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> </div>
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<div class="line"><a name="l00195"></a><span class="lineno"><a class="line" href="classChaCha.html#af533905f679066c41f4d6cd76bddb4cb"> 195</a></span> <span class="keywordtype">void</span> <a class="code" href="classChaCha.html#af533905f679066c41f4d6cd76bddb4cb">ChaCha::clear</a>()</div>
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<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> {</div>
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<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  clean(block);</div>
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<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  clean(stream);</div>
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<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  posn = 64;</div>
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<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> }</div>
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<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> </div>
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<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="comment">// Perform a ChaCha quarter round operation.</span></div>
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<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="preprocessor">#define quarterRound(a, b, c, d) \</span></div>
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<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> <span class="preprocessor"> do { \</span></div>
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<div class="line"><a name="l00205"></a><span class="lineno"> 205</span> <span class="preprocessor"> uint32_t _b = (b); \</span></div>
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<div class="line"><a name="l00206"></a><span class="lineno"> 206</span> <span class="preprocessor"> uint32_t _a = (a) + _b; \</span></div>
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<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> <span class="preprocessor"> uint32_t _d = leftRotate((d) ^ _a, 16); \</span></div>
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<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> <span class="preprocessor"> uint32_t _c = (c) + _d; \</span></div>
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<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> <span class="preprocessor"> _b = leftRotate12(_b ^ _c); \</span></div>
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<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> <span class="preprocessor"> _a += _b; \</span></div>
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<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> <span class="preprocessor"> (d) = _d = leftRotate(_d ^ _a, 8); \</span></div>
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<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> <span class="preprocessor"> _c += _d; \</span></div>
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<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="preprocessor"> (a) = _a; \</span></div>
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<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> <span class="preprocessor"> (b) = leftRotate7(_b ^ _c); \</span></div>
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<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> <span class="preprocessor"> (c) = _c; \</span></div>
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<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> <span class="preprocessor"> } while (0)</span></div>
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<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00230"></a><span class="lineno"><a class="line" href="classChaCha.html#a41ac3262e52ff49dcd916d0b3b2e2038"> 230</a></span> <span class="keywordtype">void</span> <a class="code" href="classChaCha.html#a41ac3262e52ff49dcd916d0b3b2e2038">ChaCha::hashCore</a>(uint32_t *output, <span class="keyword">const</span> uint32_t *input, uint8_t rounds)</div>
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<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> {</div>
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<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  uint8_t posn;</div>
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<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> </div>
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<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <span class="comment">// Copy the input buffer to the output prior to the first round</span></div>
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<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="comment">// and convert from little-endian to host byte order.</span></div>
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<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="keywordflow">for</span> (posn = 0; posn < 16; ++posn)</div>
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<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  output[posn] = le32toh(input[posn]);</div>
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<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> </div>
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<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="comment">// Perform the ChaCha rounds in sets of two.</span></div>
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<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="keywordflow">for</span> (; rounds >= 2; rounds -= 2) {</div>
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<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="comment">// Column round.</span></div>
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<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  quarterRound(output[0], output[4], output[8], output[12]);</div>
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<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  quarterRound(output[1], output[5], output[9], output[13]);</div>
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<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  quarterRound(output[2], output[6], output[10], output[14]);</div>
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<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  quarterRound(output[3], output[7], output[11], output[15]);</div>
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<div class="line"><a name="l00246"></a><span class="lineno"> 246</span> </div>
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<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="comment">// Diagonal round.</span></div>
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<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  quarterRound(output[0], output[5], output[10], output[15]);</div>
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<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  quarterRound(output[1], output[6], output[11], output[12]);</div>
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<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  quarterRound(output[2], output[7], output[8], output[13]);</div>
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<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  quarterRound(output[3], output[4], output[9], output[14]);</div>
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<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  }</div>
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<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> </div>
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<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="comment">// Add the original input to the final output, convert back to</span></div>
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<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="comment">// little-endian, and return the result.</span></div>
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<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="keywordflow">for</span> (posn = 0; posn < 16; ++posn)</div>
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<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  output[posn] = htole32(output[posn] + le32toh(input[posn]));</div>
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<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> }</div>
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<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> <span class="keywordtype">void</span> ChaCha::keystreamBlock(uint32_t *output)</div>
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<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> {</div>
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<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="comment">// Generate the hash output directly into the caller-supplied buffer.</span></div>
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<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <a class="code" href="classChaCha.html#a41ac3262e52ff49dcd916d0b3b2e2038">hashCore</a>(output, (<span class="keyword">const</span> uint32_t *)block, rounds);</div>
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<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  posn = 64;</div>
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<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> </div>
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<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="comment">// Increment the lowest counter byte. We are assuming that the caller</span></div>
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<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="comment">// is ChaChaPoly::setKey() and that the previous counter value was zero.</span></div>
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<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  block[48] = 1;</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"><a class="line" href="classChaCha.html#af533905f679066c41f4d6cd76bddb4cb"> 218</a></span> <span class="keywordtype">void</span> <a class="code" href="classChaCha.html#af533905f679066c41f4d6cd76bddb4cb">ChaCha::clear</a>()</div>
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<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> {</div>
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<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  clean(block);</div>
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<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  clean(stream);</div>
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<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  posn = 64;</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> </div>
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<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="comment">// Perform a ChaCha quarter round operation.</span></div>
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<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="preprocessor">#define quarterRound(a, b, c, d) \</span></div>
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<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="preprocessor"> do { \</span></div>
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<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> <span class="preprocessor"> uint32_t _b = (b); \</span></div>
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<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> <span class="preprocessor"> uint32_t _a = (a) + _b; \</span></div>
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<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> <span class="preprocessor"> uint32_t _d = leftRotate((d) ^ _a, 16); \</span></div>
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<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> <span class="preprocessor"> uint32_t _c = (c) + _d; \</span></div>
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<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="preprocessor"> _b = leftRotate12(_b ^ _c); \</span></div>
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<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> <span class="preprocessor"> _a += _b; \</span></div>
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<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> <span class="preprocessor"> (d) = _d = leftRotate(_d ^ _a, 8); \</span></div>
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<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> <span class="preprocessor"> _c += _d; \</span></div>
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<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> <span class="preprocessor"> (a) = _a; \</span></div>
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<div class="line"><a name="l00237"></a><span class="lineno"> 237</span> <span class="preprocessor"> (b) = leftRotate7(_b ^ _c); \</span></div>
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<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> <span class="preprocessor"> (c) = _c; \</span></div>
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<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> <span class="preprocessor"> } while (0)</span></div>
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<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00253"></a><span class="lineno"><a class="line" href="classChaCha.html#a41ac3262e52ff49dcd916d0b3b2e2038"> 253</a></span> <span class="keywordtype">void</span> <a class="code" href="classChaCha.html#a41ac3262e52ff49dcd916d0b3b2e2038">ChaCha::hashCore</a>(uint32_t *output, <span class="keyword">const</span> uint32_t *input, uint8_t rounds)</div>
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<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>  uint8_t posn;</div>
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<div class="line"><a name="l00256"></a><span class="lineno"> 256</span> </div>
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<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="comment">// Copy the input buffer to the output prior to the first round</span></div>
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<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  <span class="comment">// and convert from little-endian to host byte order.</span></div>
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<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="keywordflow">for</span> (posn = 0; posn < 16; ++posn)</div>
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<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  output[posn] = le32toh(input[posn]);</div>
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<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> </div>
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<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="comment">// Perform the ChaCha rounds in sets of two.</span></div>
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<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="keywordflow">for</span> (; rounds >= 2; rounds -= 2) {</div>
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<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <span class="comment">// Column round.</span></div>
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<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  quarterRound(output[0], output[4], output[8], output[12]);</div>
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<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  quarterRound(output[1], output[5], output[9], output[13]);</div>
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<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  quarterRound(output[2], output[6], output[10], output[14]);</div>
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<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  quarterRound(output[3], output[7], output[11], output[15]);</div>
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<div class="line"><a name="l00269"></a><span class="lineno"> 269</span> </div>
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<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="comment">// Diagonal round.</span></div>
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<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  quarterRound(output[0], output[5], output[10], output[15]);</div>
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<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  quarterRound(output[1], output[6], output[11], output[12]);</div>
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<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  quarterRound(output[2], output[7], output[8], output[13]);</div>
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<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  quarterRound(output[3], output[4], output[9], output[14]);</div>
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<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  }</div>
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<div class="line"><a name="l00276"></a><span class="lineno"> 276</span> </div>
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<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="comment">// Add the original input to the final output, convert back to</span></div>
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<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="comment">// little-endian, and return the result.</span></div>
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<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="keywordflow">for</span> (posn = 0; posn < 16; ++posn)</div>
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<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  output[posn] = htole32(output[posn] + le32toh(input[posn]));</div>
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<div class="line"><a name="l00281"></a><span class="lineno"> 281</span> }</div>
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<div class="ttc" id="classChaCha_html_afaa3df343a7d07976bd7e03a0c1bf43c"><div class="ttname"><a href="classChaCha.html#afaa3df343a7d07976bd7e03a0c1bf43c">ChaCha::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="ChaCha_8cpp_source.html#l00065">ChaCha.cpp:65</a></div></div>
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<div class="ttc" id="classChaCha_html_a6b2bdffbd3705e388bb458edb2f40c90"><div class="ttname"><a href="classChaCha.html#a6b2bdffbd3705e388bb458edb2f40c90">ChaCha::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="ChaCha_8cpp_source.html#l00087">ChaCha.cpp:87</a></div></div>
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<div class="ttc" id="classChaCha_html_af286083291fab2bd36dc7ad1f54d5cd7"><div class="ttname"><a href="classChaCha.html#af286083291fab2bd36dc7ad1f54d5cd7">ChaCha::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="ChaCha_8cpp_source.html#l00059">ChaCha.cpp:59</a></div></div>
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@@ -295,12 +306,12 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
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<div class="ttc" id="classChaCha_html_a5831811b705d3c80e97f0242597f0c7e"><div class="ttname"><a href="classChaCha.html#a5831811b705d3c80e97f0242597f0c7e">ChaCha::ChaCha</a></div><div class="ttdeci">ChaCha(uint8_t numRounds=20)</div><div class="ttdoc">Constructs a new ChaCha stream cipher. </div><div class="ttdef"><b>Definition:</b> <a href="ChaCha_8cpp_source.html#l00047">ChaCha.cpp:47</a></div></div>
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<div class="ttc" id="classChaCha_html_a1f54b2b51b59428010f81a6c4dc4e42c"><div class="ttname"><a href="classChaCha.html#a1f54b2b51b59428010f81a6c4dc4e42c">ChaCha::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="ChaCha_8cpp_source.html#l00190">ChaCha.cpp:190</a></div></div>
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<div class="ttc" id="classChaCha_html_acd4fff140b8871c233d9a31abf753ed8"><div class="ttname"><a href="classChaCha.html#acd4fff140b8871c233d9a31abf753ed8">ChaCha::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="ChaCha_8cpp_source.html#l00158">ChaCha.cpp:158</a></div></div>
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<div class="ttc" id="classChaCha_html_af533905f679066c41f4d6cd76bddb4cb"><div class="ttname"><a href="classChaCha.html#af533905f679066c41f4d6cd76bddb4cb">ChaCha::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="ChaCha_8cpp_source.html#l00195">ChaCha.cpp:195</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="classChaCha_html_af533905f679066c41f4d6cd76bddb4cb"><div class="ttname"><a href="classChaCha.html#af533905f679066c41f4d6cd76bddb4cb">ChaCha::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="ChaCha_8cpp_source.html#l00218">ChaCha.cpp:218</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#l00253">ChaCha.cpp:253</a></div></div>
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