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<div class="title">BigNumberUtil.cpp</div> </div>
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</div><!--header-->
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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 "BigNumberUtil.h"</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include "utility/EndianUtil.h"</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include "utility/LimbUtil.h"</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <string.h></span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div>
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<div class="line"><a name="l00055"></a><span class="lineno"><a class="line" href="classBigNumberUtil.html#a25041f898c417c8dd63f30536287ed79"> 55</a></span> <span class="keywordtype">void</span> <a class="code" href="classBigNumberUtil.html#a25041f898c417c8dd63f30536287ed79">BigNumberUtil::unpackLE</a>(limb_t *limbs, <span class="keywordtype">size_t</span> count,</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keyword">const</span> uint8_t *bytes, <span class="keywordtype">size_t</span> len)</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> {</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="preprocessor">#if BIGNUMBER_LIMB_8BIT</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor"></span> <span class="keywordflow">if</span> (len < count) {</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  memcpy(limbs, bytes, len);</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  memset(limbs + len, 0, count - len);</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  memcpy(limbs, bytes, count);</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> <span class="preprocessor">#elif CRYPTO_LITTLE_ENDIAN</span></div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="preprocessor"></span> count *= <span class="keyword">sizeof</span>(limb_t);</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">if</span> (len < count) {</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  memcpy(limbs, bytes, len);</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  memset(((uint8_t *)limbs) + len, 0, count - len);</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  memcpy(limbs, bytes, count);</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  }</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="preprocessor">#elif BIGNUMBER_LIMB_16BIT</span></div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="preprocessor"></span> <span class="keywordflow">while</span> (count > 0 && len >= 2) {</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  *limbs++ = ((limb_t)(bytes[0])) |</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  (((limb_t)(bytes[1])) << 8);</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  bytes += 2;</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  --count;</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  len -= 2;</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  }</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">if</span> (count > 0 && len == 1) {</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  *limbs++ = ((limb_t)(bytes[0]));</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  --count;</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"> 85</span>  <span class="keywordflow">while</span> (count > 0) {</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  *limbs++ = 0;</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  --count;</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  }</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="preprocessor">#elif BIGNUMBER_LIMB_32BIT</span></div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="preprocessor"></span> <span class="keywordflow">while</span> (count > 0 && len >= 4) {</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  *limbs++ = ((limb_t)(bytes[0])) |</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  (((limb_t)(bytes[1])) << 8) |</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  (((limb_t)(bytes[2])) << 16) |</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  (((limb_t)(bytes[3])) << 24);</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  bytes += 4;</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  --count;</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  len -= 4;</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  }</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">if</span> (count > 0) {</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">if</span> (len == 3) {</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  *limbs++ = ((limb_t)(bytes[0])) |</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  (((limb_t)(bytes[1])) << 8) |</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  (((limb_t)(bytes[2])) << 16);</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (len == 2) {</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  *limbs++ = ((limb_t)(bytes[0])) |</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  (((limb_t)(bytes[1])) << 8);</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (len == 1) {</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  *limbs++ = ((limb_t)(bytes[0]));</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>  --count;</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>  <span class="keywordflow">while</span> (count > 0) {</div>
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|
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  *limbs++ = 0;</div>
|
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  --count;</div>
|
|
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  }</div>
|
|
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="preprocessor"></span>}</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="l00134"></a><span class="lineno"><a class="line" href="classBigNumberUtil.html#a63f9d7884eb36227d39e1b95e219d865"> 134</a></span> <span class="keywordtype">void</span> <a class="code" href="classBigNumberUtil.html#a63f9d7884eb36227d39e1b95e219d865">BigNumberUtil::unpackBE</a>(limb_t *limbs, <span class="keywordtype">size_t</span> count,</div>
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|
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keyword">const</span> uint8_t *bytes, <span class="keywordtype">size_t</span> len)</div>
|
|
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> {</div>
|
|
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="preprocessor">#if BIGNUMBER_LIMB_8BIT</span></div>
|
|
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="preprocessor"></span> <span class="keywordflow">while</span> (count > 0 && len > 0) {</div>
|
|
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  --count;</div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  --len;</div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  *limbs++ = bytes[len];</div>
|
|
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  }</div>
|
|
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  memset(limbs, 0, count);</div>
|
|
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="preprocessor">#elif BIGNUMBER_LIMB_16BIT</span></div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="preprocessor"></span> bytes += len;</div>
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|
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="keywordflow">while</span> (count > 0 && len >= 2) {</div>
|
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  --count;</div>
|
|
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  bytes -= 2;</div>
|
|
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  len -= 2;</div>
|
|
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  *limbs++ = ((limb_t)(bytes[1])) |</div>
|
|
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  (((limb_t)(bytes[0])) << 8);</div>
|
|
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  }</div>
|
|
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keywordflow">if</span> (count > 0 && len == 1) {</div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  --count;</div>
|
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<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  --bytes;</div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  *limbs++ = (limb_t)(bytes[0]);</div>
|
|
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  }</div>
|
|
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  memset(limbs, 0, count * <span class="keyword">sizeof</span>(limb_t));</div>
|
|
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="preprocessor">#elif BIGNUMBER_LIMB_32BIT</span></div>
|
|
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="preprocessor"></span> bytes += len;</div>
|
|
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="keywordflow">while</span> (count > 0 && len >= 4) {</div>
|
|
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  --count;</div>
|
|
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  bytes -= 4;</div>
|
|
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  len -= 4;</div>
|
|
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  *limbs++ = ((limb_t)(bytes[3])) |</div>
|
|
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  (((limb_t)(bytes[2])) << 8) |</div>
|
|
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  (((limb_t)(bytes[1])) << 16) |</div>
|
|
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  (((limb_t)(bytes[0])) << 24);</div>
|
|
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  }</div>
|
|
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keywordflow">if</span> (count > 0) {</div>
|
|
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keywordflow">if</span> (len == 3) {</div>
|
|
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  --count;</div>
|
|
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  bytes -= 3;</div>
|
|
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  *limbs++ = ((limb_t)(bytes[2])) |</div>
|
|
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  (((limb_t)(bytes[1])) << 8) |</div>
|
|
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  (((limb_t)(bytes[0])) << 16);</div>
|
|
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (len == 2) {</div>
|
|
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  --count;</div>
|
|
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  bytes -= 2;</div>
|
|
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  *limbs++ = ((limb_t)(bytes[1])) |</div>
|
|
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  (((limb_t)(bytes[0])) << 8);</div>
|
|
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (len == 1) {</div>
|
|
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  --count;</div>
|
|
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  --bytes;</div>
|
|
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  *limbs++ = (limb_t)(bytes[0]);</div>
|
|
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  }</div>
|
|
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  }</div>
|
|
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  memset(limbs, 0, count * <span class="keyword">sizeof</span>(limb_t));</div>
|
|
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="preprocessor">#endif</span></div>
|
|
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="preprocessor"></span>}</div>
|
|
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> </div>
|
|
<div class="line"><a name="l00208"></a><span class="lineno"><a class="line" href="classBigNumberUtil.html#a989cd5f389ac5adc798d8767383e2810"> 208</a></span> <span class="keywordtype">void</span> <a class="code" href="classBigNumberUtil.html#a989cd5f389ac5adc798d8767383e2810">BigNumberUtil::packLE</a>(uint8_t *bytes, <span class="keywordtype">size_t</span> len,</div>
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|
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="keyword">const</span> limb_t *limbs, <span class="keywordtype">size_t</span> count)</div>
|
|
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> {</div>
|
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<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> <span class="preprocessor">#if BIGNUMBER_LIMB_8BIT</span></div>
|
|
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> <span class="preprocessor"></span> <span class="keywordflow">if</span> (len <= count) {</div>
|
|
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  memcpy(bytes, limbs, len);</div>
|
|
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  memcpy(bytes, limbs, count);</div>
|
|
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  memset(bytes + count, 0, len - count);</div>
|
|
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  }</div>
|
|
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="preprocessor">#elif CRYPTO_LITTLE_ENDIAN</span></div>
|
|
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="preprocessor"></span> count *= <span class="keyword">sizeof</span>(limb_t);</div>
|
|
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keywordflow">if</span> (len <= count) {</div>
|
|
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  memcpy(bytes, limbs, len);</div>
|
|
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  memcpy(bytes, limbs, count);</div>
|
|
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  memset(bytes + count, 0, len - count);</div>
|
|
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  }</div>
|
|
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="preprocessor">#elif BIGNUMBER_LIMB_16BIT</span></div>
|
|
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="preprocessor"></span> limb_t word;</div>
|
|
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <span class="keywordflow">while</span> (count > 0 && len >= 2) {</div>
|
|
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  word = *limbs++;</div>
|
|
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  bytes[0] = (uint8_t)word;</div>
|
|
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  bytes[1] = (uint8_t)(word >> 8);</div>
|
|
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  --count;</div>
|
|
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  len -= 2;</div>
|
|
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  bytes += 2;</div>
|
|
<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>  <span class="keywordflow">if</span> (count > 0 && len == 1) {</div>
|
|
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  bytes[0] = (uint8_t)(*limbs);</div>
|
|
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  --len;</div>
|
|
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  ++bytes;</div>
|
|
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  }</div>
|
|
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  memset(bytes, 0, len);</div>
|
|
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="preprocessor">#elif BIGNUMBER_LIMB_32BIT</span></div>
|
|
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span> <span class="preprocessor"></span> limb_t word;</div>
|
|
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="keywordflow">while</span> (count > 0 && len >= 4) {</div>
|
|
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  word = *limbs++;</div>
|
|
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  bytes[0] = (uint8_t)word;</div>
|
|
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  bytes[1] = (uint8_t)(word >> 8);</div>
|
|
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  bytes[2] = (uint8_t)(word >> 16);</div>
|
|
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  bytes[3] = (uint8_t)(word >> 24);</div>
|
|
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  --count;</div>
|
|
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  len -= 4;</div>
|
|
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  bytes += 4;</div>
|
|
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  }</div>
|
|
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="keywordflow">if</span> (count > 0) {</div>
|
|
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="keywordflow">if</span> (len == 3) {</div>
|
|
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  word = *limbs;</div>
|
|
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  bytes[0] = (uint8_t)word;</div>
|
|
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  bytes[1] = (uint8_t)(word >> 8);</div>
|
|
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  bytes[2] = (uint8_t)(word >> 16);</div>
|
|
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  len -= 3;</div>
|
|
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  bytes += 3;</div>
|
|
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (len == 2) {</div>
|
|
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  word = *limbs;</div>
|
|
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  bytes[0] = (uint8_t)word;</div>
|
|
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  bytes[1] = (uint8_t)(word >> 8);</div>
|
|
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  len -= 2;</div>
|
|
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  bytes += 2;</div>
|
|
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (len == 1) {</div>
|
|
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  bytes[0] = (uint8_t)(*limbs);</div>
|
|
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  --len;</div>
|
|
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  ++bytes;</div>
|
|
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  }</div>
|
|
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  }</div>
|
|
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  memset(bytes, 0, len);</div>
|
|
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span> <span class="preprocessor">#endif</span></div>
|
|
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span> <span class="preprocessor"></span>}</div>
|
|
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span> </div>
|
|
<div class="line"><a name="l00294"></a><span class="lineno"><a class="line" href="classBigNumberUtil.html#af49dd38173ea0310776d283aabea2ba0"> 294</a></span> <span class="keywordtype">void</span> <a class="code" href="classBigNumberUtil.html#af49dd38173ea0310776d283aabea2ba0">BigNumberUtil::packBE</a>(uint8_t *bytes, <span class="keywordtype">size_t</span> len,</div>
|
|
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="keyword">const</span> limb_t *limbs, <span class="keywordtype">size_t</span> count)</div>
|
|
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span> {</div>
|
|
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span> <span class="preprocessor">#if BIGNUMBER_LIMB_8BIT</span></div>
|
|
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span> <span class="preprocessor"></span> <span class="keywordflow">if</span> (len > count) {</div>
|
|
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  <span class="keywordtype">size_t</span> size = len - count;</div>
|
|
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  memset(bytes, 0, size);</div>
|
|
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  len -= size;</div>
|
|
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  bytes += size;</div>
|
|
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (len < count) {</div>
|
|
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  count = len;</div>
|
|
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  }</div>
|
|
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  limbs += count;</div>
|
|
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <span class="keywordflow">while</span> (count > 0) {</div>
|
|
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  --count;</div>
|
|
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  *bytes++ = *(--limbs);</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="preprocessor">#elif BIGNUMBER_LIMB_16BIT</span></div>
|
|
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span> <span class="preprocessor"></span> <span class="keywordtype">size_t</span> countBytes = count * <span class="keyword">sizeof</span>(limb_t);</div>
|
|
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  limb_t word;</div>
|
|
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  <span class="keywordflow">if</span> (len >= countBytes) {</div>
|
|
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="keywordtype">size_t</span> size = len - countBytes;</div>
|
|
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  memset(bytes, 0, size);</div>
|
|
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  len -= size;</div>
|
|
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  bytes += size;</div>
|
|
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  limbs += count;</div>
|
|
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  count = len / <span class="keyword">sizeof</span>(limb_t);</div>
|
|
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  limbs += count;</div>
|
|
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  <span class="keywordflow">if</span> ((len & 1) != 0)</div>
|
|
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  *bytes++ = (uint8_t)(*limbs);</div>
|
|
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  }</div>
|
|
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  <span class="keywordflow">while</span> (count > 0) {</div>
|
|
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  --count;</div>
|
|
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  word = *(--limbs);</div>
|
|
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  *bytes++ = (uint8_t)(word >> 8);</div>
|
|
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  *bytes++ = (uint8_t)word;</div>
|
|
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  }</div>
|
|
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span> <span class="preprocessor">#elif BIGNUMBER_LIMB_32BIT</span></div>
|
|
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span> <span class="preprocessor"></span> <span class="keywordtype">size_t</span> countBytes = count * <span class="keyword">sizeof</span>(limb_t);</div>
|
|
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  limb_t word;</div>
|
|
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  <span class="keywordflow">if</span> (len >= countBytes) {</div>
|
|
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  <span class="keywordtype">size_t</span> size = len - countBytes;</div>
|
|
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  memset(bytes, 0, size);</div>
|
|
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  len -= size;</div>
|
|
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  bytes += size;</div>
|
|
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  limbs += count;</div>
|
|
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  count = len / <span class="keyword">sizeof</span>(limb_t);</div>
|
|
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  limbs += count;</div>
|
|
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  <span class="keywordflow">if</span> ((len & 3) == 3) {</div>
|
|
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  word = *limbs;</div>
|
|
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  *bytes++ = (uint8_t)(word >> 16);</div>
|
|
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  *bytes++ = (uint8_t)(word >> 8);</div>
|
|
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  *bytes++ = (uint8_t)word;</div>
|
|
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((len & 3) == 2) {</div>
|
|
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  word = *limbs;</div>
|
|
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  *bytes++ = (uint8_t)(word >> 8);</div>
|
|
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  *bytes++ = (uint8_t)word;</div>
|
|
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((len & 3) == 1) {</div>
|
|
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  *bytes++ = (uint8_t)(*limbs);</div>
|
|
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  }</div>
|
|
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  }</div>
|
|
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <span class="keywordflow">while</span> (count > 0) {</div>
|
|
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  --count;</div>
|
|
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  word = *(--limbs);</div>
|
|
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  *bytes++ = (uint8_t)(word >> 24);</div>
|
|
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  *bytes++ = (uint8_t)(word >> 16);</div>
|
|
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  *bytes++ = (uint8_t)(word >> 8);</div>
|
|
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  *bytes++ = (uint8_t)word;</div>
|
|
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  }</div>
|
|
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span> <span class="preprocessor">#endif</span></div>
|
|
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span> <span class="preprocessor"></span>}</div>
|
|
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span> </div>
|
|
<div class="line"><a name="l00381"></a><span class="lineno"><a class="line" href="classBigNumberUtil.html#aa6904b2727af6b767fe041b1b7f27414"> 381</a></span> limb_t <a class="code" href="classBigNumberUtil.html#aa6904b2727af6b767fe041b1b7f27414">BigNumberUtil::add</a>(limb_t *result, <span class="keyword">const</span> limb_t *x,</div>
|
|
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  <span class="keyword">const</span> limb_t *y, <span class="keywordtype">size_t</span> size)</div>
|
|
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span> {</div>
|
|
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  dlimb_t carry = 0;</div>
|
|
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  <span class="keywordflow">while</span> (size > 0) {</div>
|
|
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  carry += *x++;</div>
|
|
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  carry += *y++;</div>
|
|
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  *result++ = (limb_t)carry;</div>
|
|
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  carry >>= LIMB_BITS;</div>
|
|
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  --size;</div>
|
|
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  }</div>
|
|
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  <span class="keywordflow">return</span> (limb_t)carry;</div>
|
|
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span> }</div>
|
|
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span> </div>
|
|
<div class="line"><a name="l00408"></a><span class="lineno"><a class="line" href="classBigNumberUtil.html#a6618e03bfcb3086961df508b40cc1e67"> 408</a></span> limb_t <a class="code" href="classBigNumberUtil.html#a6618e03bfcb3086961df508b40cc1e67">BigNumberUtil::sub</a>(limb_t *result, <span class="keyword">const</span> limb_t *x,</div>
|
|
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  <span class="keyword">const</span> limb_t *y, <span class="keywordtype">size_t</span> size)</div>
|
|
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span> {</div>
|
|
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  dlimb_t borrow = 0;</div>
|
|
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  <span class="keywordflow">while</span> (size > 0) {</div>
|
|
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  borrow = ((dlimb_t)(*x++)) - (*y++) - ((borrow >> LIMB_BITS) & 0x01);</div>
|
|
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  *result++ = (limb_t)borrow;</div>
|
|
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  --size;</div>
|
|
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  }</div>
|
|
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  <span class="keywordflow">return</span> ((limb_t)(borrow >> LIMB_BITS)) & 0x01;</div>
|
|
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span> }</div>
|
|
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span> </div>
|
|
<div class="line"><a name="l00432"></a><span class="lineno"><a class="line" href="classBigNumberUtil.html#a1c2c5484f2bf440ae292fd3dfd2d594f"> 432</a></span> <span class="keywordtype">void</span> <a class="code" href="classBigNumberUtil.html#a1c2c5484f2bf440ae292fd3dfd2d594f">BigNumberUtil::mul</a>(limb_t *result, <span class="keyword">const</span> limb_t *x, <span class="keywordtype">size_t</span> xcount,</div>
|
|
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  <span class="keyword">const</span> limb_t *y, <span class="keywordtype">size_t</span> ycount)</div>
|
|
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span> {</div>
|
|
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span>  <span class="keywordtype">size_t</span> i, j;</div>
|
|
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  dlimb_t carry;</div>
|
|
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  limb_t word;</div>
|
|
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  <span class="keyword">const</span> limb_t *xx;</div>
|
|
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  limb_t *rr;</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>  <span class="comment">// Multiply the lowest limb of y by x.</span></div>
|
|
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  carry = 0;</div>
|
|
<div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  word = y[0];</div>
|
|
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span>  xx = x;</div>
|
|
<div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  rr = result;</div>
|
|
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span>  <span class="keywordflow">for</span> (i = 0; i < xcount; ++i) {</div>
|
|
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  carry += ((dlimb_t)(*xx++)) * word;</div>
|
|
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  *rr++ = (limb_t)carry;</div>
|
|
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span>  carry >>= LIMB_BITS;</div>
|
|
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  }</div>
|
|
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span>  *rr = (limb_t)carry;</div>
|
|
<div class="line"><a name="l00452"></a><span class="lineno"> 452</span> </div>
|
|
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  <span class="comment">// Multiply and add the remaining limbs of y by x.</span></div>
|
|
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span>  <span class="keywordflow">for</span> (i = 1; i < ycount; ++i) {</div>
|
|
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span>  word = y[i];</div>
|
|
<div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  carry = 0;</div>
|
|
<div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  xx = x;</div>
|
|
<div class="line"><a name="l00458"></a><span class="lineno"> 458</span>  rr = result + i;</div>
|
|
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span>  <span class="keywordflow">for</span> (j = 0; j < xcount; ++j) {</div>
|
|
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  carry += ((dlimb_t)(*xx++)) * word;</div>
|
|
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  carry += *rr;</div>
|
|
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  *rr++ = (limb_t)carry;</div>
|
|
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span>  carry >>= LIMB_BITS;</div>
|
|
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  }</div>
|
|
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  *rr = (limb_t)carry;</div>
|
|
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span>  }</div>
|
|
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span> }</div>
|
|
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span> </div>
|
|
<div class="line"><a name="l00484"></a><span class="lineno"><a class="line" href="classBigNumberUtil.html#a5af5f50c91594183da4e079d76702d34"> 484</a></span> <span class="keywordtype">void</span> <a class="code" href="classBigNumberUtil.html#a5af5f50c91594183da4e079d76702d34">BigNumberUtil::reduceQuick</a>(limb_t *result, <span class="keyword">const</span> limb_t *x,</div>
|
|
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span>  <span class="keyword">const</span> limb_t *y, <span class="keywordtype">size_t</span> size)</div>
|
|
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span> {</div>
|
|
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  <span class="comment">// Subtract "y" from "x" and turn the borrow into an AND mask.</span></div>
|
|
<div class="line"><a name="l00488"></a><span class="lineno"> 488</span>  limb_t mask = <a class="code" href="classBigNumberUtil.html#a6618e03bfcb3086961df508b40cc1e67">sub</a>(result, x, y, size);</div>
|
|
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  mask = (~mask) + 1;</div>
|
|
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span> </div>
|
|
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span>  <span class="comment">// Add "y" back to the result if the mask is non-zero.</span></div>
|
|
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span>  dlimb_t carry = 0;</div>
|
|
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span>  <span class="keywordflow">while</span> (size > 0) {</div>
|
|
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span>  carry += *result;</div>
|
|
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  carry += (*y++ & mask);</div>
|
|
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span>  *result++ = (limb_t)carry;</div>
|
|
<div class="line"><a name="l00497"></a><span class="lineno"> 497</span>  carry >>= LIMB_BITS;</div>
|
|
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  --size;</div>
|
|
<div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  }</div>
|
|
<div class="line"><a name="l00500"></a><span class="lineno"> 500</span> }</div>
|
|
<div class="line"><a name="l00501"></a><span class="lineno"> 501</span> </div>
|
|
<div class="line"><a name="l00514"></a><span class="lineno"><a class="line" href="classBigNumberUtil.html#ab9a9f532fcfc182433adac44d8e4ee20"> 514</a></span> limb_t <a class="code" href="classBigNumberUtil.html#ab9a9f532fcfc182433adac44d8e4ee20">BigNumberUtil::add_P</a>(limb_t *result, <span class="keyword">const</span> limb_t *x,</div>
|
|
<div class="line"><a name="l00515"></a><span class="lineno"> 515</span>  <span class="keyword">const</span> limb_t *y, <span class="keywordtype">size_t</span> size)</div>
|
|
<div class="line"><a name="l00516"></a><span class="lineno"> 516</span> {</div>
|
|
<div class="line"><a name="l00517"></a><span class="lineno"> 517</span>  dlimb_t carry = 0;</div>
|
|
<div class="line"><a name="l00518"></a><span class="lineno"> 518</span>  <span class="keywordflow">while</span> (size > 0) {</div>
|
|
<div class="line"><a name="l00519"></a><span class="lineno"> 519</span>  carry += *x++;</div>
|
|
<div class="line"><a name="l00520"></a><span class="lineno"> 520</span>  carry += pgm_read_limb(y++);</div>
|
|
<div class="line"><a name="l00521"></a><span class="lineno"> 521</span>  *result++ = (limb_t)carry;</div>
|
|
<div class="line"><a name="l00522"></a><span class="lineno"> 522</span>  carry >>= LIMB_BITS;</div>
|
|
<div class="line"><a name="l00523"></a><span class="lineno"> 523</span>  --size;</div>
|
|
<div class="line"><a name="l00524"></a><span class="lineno"> 524</span>  }</div>
|
|
<div class="line"><a name="l00525"></a><span class="lineno"> 525</span>  <span class="keywordflow">return</span> (limb_t)carry;</div>
|
|
<div class="line"><a name="l00526"></a><span class="lineno"> 526</span> }</div>
|
|
<div class="line"><a name="l00527"></a><span class="lineno"> 527</span> </div>
|
|
<div class="line"><a name="l00541"></a><span class="lineno"><a class="line" href="classBigNumberUtil.html#af0fa1527647af42b65eda6b0aab982b3"> 541</a></span> limb_t <a class="code" href="classBigNumberUtil.html#af0fa1527647af42b65eda6b0aab982b3">BigNumberUtil::sub_P</a>(limb_t *result, <span class="keyword">const</span> limb_t *x,</div>
|
|
<div class="line"><a name="l00542"></a><span class="lineno"> 542</span>  <span class="keyword">const</span> limb_t *y, <span class="keywordtype">size_t</span> size)</div>
|
|
<div class="line"><a name="l00543"></a><span class="lineno"> 543</span> {</div>
|
|
<div class="line"><a name="l00544"></a><span class="lineno"> 544</span>  dlimb_t borrow = 0;</div>
|
|
<div class="line"><a name="l00545"></a><span class="lineno"> 545</span>  <span class="keywordflow">while</span> (size > 0) {</div>
|
|
<div class="line"><a name="l00546"></a><span class="lineno"> 546</span>  borrow = ((dlimb_t)(*x++)) - pgm_read_limb(y++) - ((borrow >> LIMB_BITS) & 0x01);</div>
|
|
<div class="line"><a name="l00547"></a><span class="lineno"> 547</span>  *result++ = (limb_t)borrow;</div>
|
|
<div class="line"><a name="l00548"></a><span class="lineno"> 548</span>  --size;</div>
|
|
<div class="line"><a name="l00549"></a><span class="lineno"> 549</span>  }</div>
|
|
<div class="line"><a name="l00550"></a><span class="lineno"> 550</span>  <span class="keywordflow">return</span> ((limb_t)(borrow >> LIMB_BITS)) & 0x01;</div>
|
|
<div class="line"><a name="l00551"></a><span class="lineno"> 551</span> }</div>
|
|
<div class="line"><a name="l00552"></a><span class="lineno"> 552</span> </div>
|
|
<div class="line"><a name="l00566"></a><span class="lineno"><a class="line" href="classBigNumberUtil.html#aacdee1806a239eb9e58753ef1ddb964a"> 566</a></span> <span class="keywordtype">void</span> <a class="code" href="classBigNumberUtil.html#aacdee1806a239eb9e58753ef1ddb964a">BigNumberUtil::mul_P</a>(limb_t *result, <span class="keyword">const</span> limb_t *x, <span class="keywordtype">size_t</span> xcount,</div>
|
|
<div class="line"><a name="l00567"></a><span class="lineno"> 567</span>  <span class="keyword">const</span> limb_t *y, <span class="keywordtype">size_t</span> ycount)</div>
|
|
<div class="line"><a name="l00568"></a><span class="lineno"> 568</span> {</div>
|
|
<div class="line"><a name="l00569"></a><span class="lineno"> 569</span>  <span class="keywordtype">size_t</span> i, j;</div>
|
|
<div class="line"><a name="l00570"></a><span class="lineno"> 570</span>  dlimb_t carry;</div>
|
|
<div class="line"><a name="l00571"></a><span class="lineno"> 571</span>  limb_t word;</div>
|
|
<div class="line"><a name="l00572"></a><span class="lineno"> 572</span>  <span class="keyword">const</span> limb_t *xx;</div>
|
|
<div class="line"><a name="l00573"></a><span class="lineno"> 573</span>  limb_t *rr;</div>
|
|
<div class="line"><a name="l00574"></a><span class="lineno"> 574</span> </div>
|
|
<div class="line"><a name="l00575"></a><span class="lineno"> 575</span>  <span class="comment">// Multiply the lowest limb of y by x.</span></div>
|
|
<div class="line"><a name="l00576"></a><span class="lineno"> 576</span>  carry = 0;</div>
|
|
<div class="line"><a name="l00577"></a><span class="lineno"> 577</span>  word = pgm_read_limb(&(y[0]));</div>
|
|
<div class="line"><a name="l00578"></a><span class="lineno"> 578</span>  xx = x;</div>
|
|
<div class="line"><a name="l00579"></a><span class="lineno"> 579</span>  rr = result;</div>
|
|
<div class="line"><a name="l00580"></a><span class="lineno"> 580</span>  <span class="keywordflow">for</span> (i = 0; i < xcount; ++i) {</div>
|
|
<div class="line"><a name="l00581"></a><span class="lineno"> 581</span>  carry += ((dlimb_t)(*xx++)) * word;</div>
|
|
<div class="line"><a name="l00582"></a><span class="lineno"> 582</span>  *rr++ = (limb_t)carry;</div>
|
|
<div class="line"><a name="l00583"></a><span class="lineno"> 583</span>  carry >>= LIMB_BITS;</div>
|
|
<div class="line"><a name="l00584"></a><span class="lineno"> 584</span>  }</div>
|
|
<div class="line"><a name="l00585"></a><span class="lineno"> 585</span>  *rr = (limb_t)carry;</div>
|
|
<div class="line"><a name="l00586"></a><span class="lineno"> 586</span> </div>
|
|
<div class="line"><a name="l00587"></a><span class="lineno"> 587</span>  <span class="comment">// Multiply and add the remaining limb of y by x.</span></div>
|
|
<div class="line"><a name="l00588"></a><span class="lineno"> 588</span>  <span class="keywordflow">for</span> (i = 1; i < ycount; ++i) {</div>
|
|
<div class="line"><a name="l00589"></a><span class="lineno"> 589</span>  word = pgm_read_limb(&(y[i]));</div>
|
|
<div class="line"><a name="l00590"></a><span class="lineno"> 590</span>  carry = 0;</div>
|
|
<div class="line"><a name="l00591"></a><span class="lineno"> 591</span>  xx = x;</div>
|
|
<div class="line"><a name="l00592"></a><span class="lineno"> 592</span>  rr = result + i;</div>
|
|
<div class="line"><a name="l00593"></a><span class="lineno"> 593</span>  <span class="keywordflow">for</span> (j = 0; j < xcount; ++j) {</div>
|
|
<div class="line"><a name="l00594"></a><span class="lineno"> 594</span>  carry += ((dlimb_t)(*xx++)) * word;</div>
|
|
<div class="line"><a name="l00595"></a><span class="lineno"> 595</span>  carry += *rr;</div>
|
|
<div class="line"><a name="l00596"></a><span class="lineno"> 596</span>  *rr++ = (limb_t)carry;</div>
|
|
<div class="line"><a name="l00597"></a><span class="lineno"> 597</span>  carry >>= LIMB_BITS;</div>
|
|
<div class="line"><a name="l00598"></a><span class="lineno"> 598</span>  }</div>
|
|
<div class="line"><a name="l00599"></a><span class="lineno"> 599</span>  *rr = (limb_t)carry;</div>
|
|
<div class="line"><a name="l00600"></a><span class="lineno"> 600</span>  }</div>
|
|
<div class="line"><a name="l00601"></a><span class="lineno"> 601</span> }</div>
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<div class="line"><a name="l00602"></a><span class="lineno"> 602</span> </div>
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<div class="line"><a name="l00620"></a><span class="lineno"><a class="line" href="classBigNumberUtil.html#a00c9cde0b626788a60552a6bc9ce058b"> 620</a></span> <span class="keywordtype">void</span> <a class="code" href="classBigNumberUtil.html#a00c9cde0b626788a60552a6bc9ce058b">BigNumberUtil::reduceQuick_P</a>(limb_t *result, <span class="keyword">const</span> limb_t *x,</div>
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<div class="line"><a name="l00621"></a><span class="lineno"> 621</span>  <span class="keyword">const</span> limb_t *y, <span class="keywordtype">size_t</span> size)</div>
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<div class="line"><a name="l00622"></a><span class="lineno"> 622</span> {</div>
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<div class="line"><a name="l00623"></a><span class="lineno"> 623</span>  <span class="comment">// Subtract "y" from "x" and turn the borrow into an AND mask.</span></div>
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<div class="line"><a name="l00624"></a><span class="lineno"> 624</span>  limb_t mask = <a class="code" href="classBigNumberUtil.html#af0fa1527647af42b65eda6b0aab982b3">sub_P</a>(result, x, y, size);</div>
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<div class="line"><a name="l00625"></a><span class="lineno"> 625</span>  mask = (~mask) + 1;</div>
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<div class="line"><a name="l00626"></a><span class="lineno"> 626</span> </div>
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<div class="line"><a name="l00627"></a><span class="lineno"> 627</span>  <span class="comment">// Add "y" back to the result if the mask is non-zero.</span></div>
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<div class="line"><a name="l00628"></a><span class="lineno"> 628</span>  dlimb_t carry = 0;</div>
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<div class="line"><a name="l00629"></a><span class="lineno"> 629</span>  <span class="keywordflow">while</span> (size > 0) {</div>
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<div class="line"><a name="l00630"></a><span class="lineno"> 630</span>  carry += *result;</div>
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<div class="line"><a name="l00631"></a><span class="lineno"> 631</span>  carry += (pgm_read_limb(y++) & mask);</div>
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<div class="line"><a name="l00632"></a><span class="lineno"> 632</span>  *result++ = (limb_t)carry;</div>
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<div class="line"><a name="l00633"></a><span class="lineno"> 633</span>  carry >>= LIMB_BITS;</div>
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<div class="line"><a name="l00634"></a><span class="lineno"> 634</span>  --size;</div>
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<div class="line"><a name="l00635"></a><span class="lineno"> 635</span>  }</div>
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<div class="line"><a name="l00636"></a><span class="lineno"> 636</span> }</div>
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<div class="ttc" id="classBigNumberUtil_html_a00c9cde0b626788a60552a6bc9ce058b"><div class="ttname"><a href="classBigNumberUtil.html#a00c9cde0b626788a60552a6bc9ce058b">BigNumberUtil::reduceQuick_P</a></div><div class="ttdeci">static void reduceQuick_P(limb_t *result, const limb_t *x, const limb_t *y, size_t size)</div><div class="ttdoc">Reduces x modulo y using subtraction where y is in program memory. </div><div class="ttdef"><b>Definition:</b> <a href="BigNumberUtil_8cpp_source.html#l00620">BigNumberUtil.cpp:620</a></div></div>
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<div class="ttc" id="classBigNumberUtil_html_aa6904b2727af6b767fe041b1b7f27414"><div class="ttname"><a href="classBigNumberUtil.html#aa6904b2727af6b767fe041b1b7f27414">BigNumberUtil::add</a></div><div class="ttdeci">static limb_t add(limb_t *result, const limb_t *x, const limb_t *y, size_t size)</div><div class="ttdoc">Adds two big numbers. </div><div class="ttdef"><b>Definition:</b> <a href="BigNumberUtil_8cpp_source.html#l00381">BigNumberUtil.cpp:381</a></div></div>
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<div class="ttc" id="classBigNumberUtil_html_af0fa1527647af42b65eda6b0aab982b3"><div class="ttname"><a href="classBigNumberUtil.html#af0fa1527647af42b65eda6b0aab982b3">BigNumberUtil::sub_P</a></div><div class="ttdeci">static limb_t sub_P(limb_t *result, const limb_t *x, const limb_t *y, size_t size)</div><div class="ttdoc">Subtracts one big number from another where one is in program memory. </div><div class="ttdef"><b>Definition:</b> <a href="BigNumberUtil_8cpp_source.html#l00541">BigNumberUtil.cpp:541</a></div></div>
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<div class="ttc" id="classBigNumberUtil_html_a5af5f50c91594183da4e079d76702d34"><div class="ttname"><a href="classBigNumberUtil.html#a5af5f50c91594183da4e079d76702d34">BigNumberUtil::reduceQuick</a></div><div class="ttdeci">static void reduceQuick(limb_t *result, const limb_t *x, const limb_t *y, size_t size)</div><div class="ttdoc">Reduces x modulo y using subtraction. </div><div class="ttdef"><b>Definition:</b> <a href="BigNumberUtil_8cpp_source.html#l00484">BigNumberUtil.cpp:484</a></div></div>
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<div class="ttc" id="classBigNumberUtil_html_a6618e03bfcb3086961df508b40cc1e67"><div class="ttname"><a href="classBigNumberUtil.html#a6618e03bfcb3086961df508b40cc1e67">BigNumberUtil::sub</a></div><div class="ttdeci">static limb_t sub(limb_t *result, const limb_t *x, const limb_t *y, size_t size)</div><div class="ttdoc">Subtracts one big number from another. </div><div class="ttdef"><b>Definition:</b> <a href="BigNumberUtil_8cpp_source.html#l00408">BigNumberUtil.cpp:408</a></div></div>
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<div class="ttc" id="classBigNumberUtil_html_aacdee1806a239eb9e58753ef1ddb964a"><div class="ttname"><a href="classBigNumberUtil.html#aacdee1806a239eb9e58753ef1ddb964a">BigNumberUtil::mul_P</a></div><div class="ttdeci">static void mul_P(limb_t *result, const limb_t *x, size_t xcount, const limb_t *y, size_t ycount)</div><div class="ttdoc">Multiplies two big numbers where one is in program memory. </div><div class="ttdef"><b>Definition:</b> <a href="BigNumberUtil_8cpp_source.html#l00566">BigNumberUtil.cpp:566</a></div></div>
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<div class="ttc" id="classBigNumberUtil_html_af49dd38173ea0310776d283aabea2ba0"><div class="ttname"><a href="classBigNumberUtil.html#af49dd38173ea0310776d283aabea2ba0">BigNumberUtil::packBE</a></div><div class="ttdeci">static void packBE(uint8_t *bytes, size_t len, const limb_t *limbs, size_t count)</div><div class="ttdoc">Packs the big-endian byte representation of a big number into a byte array. </div><div class="ttdef"><b>Definition:</b> <a href="BigNumberUtil_8cpp_source.html#l00294">BigNumberUtil.cpp:294</a></div></div>
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<div class="ttc" id="classBigNumberUtil_html_a25041f898c417c8dd63f30536287ed79"><div class="ttname"><a href="classBigNumberUtil.html#a25041f898c417c8dd63f30536287ed79">BigNumberUtil::unpackLE</a></div><div class="ttdeci">static void unpackLE(limb_t *limbs, size_t count, const uint8_t *bytes, size_t len)</div><div class="ttdoc">Unpacks the little-endian byte representation of a big number into a limb array. </div><div class="ttdef"><b>Definition:</b> <a href="BigNumberUtil_8cpp_source.html#l00055">BigNumberUtil.cpp:55</a></div></div>
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<div class="ttc" id="classBigNumberUtil_html_a1c2c5484f2bf440ae292fd3dfd2d594f"><div class="ttname"><a href="classBigNumberUtil.html#a1c2c5484f2bf440ae292fd3dfd2d594f">BigNumberUtil::mul</a></div><div class="ttdeci">static void mul(limb_t *result, const limb_t *x, size_t xcount, const limb_t *y, size_t ycount)</div><div class="ttdoc">Multiplies two big numbers. </div><div class="ttdef"><b>Definition:</b> <a href="BigNumberUtil_8cpp_source.html#l00432">BigNumberUtil.cpp:432</a></div></div>
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<div class="ttc" id="classBigNumberUtil_html_a63f9d7884eb36227d39e1b95e219d865"><div class="ttname"><a href="classBigNumberUtil.html#a63f9d7884eb36227d39e1b95e219d865">BigNumberUtil::unpackBE</a></div><div class="ttdeci">static void unpackBE(limb_t *limbs, size_t count, const uint8_t *bytes, size_t len)</div><div class="ttdoc">Unpacks the big-endian byte representation of a big number into a limb array. </div><div class="ttdef"><b>Definition:</b> <a href="BigNumberUtil_8cpp_source.html#l00134">BigNumberUtil.cpp:134</a></div></div>
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<div class="ttc" id="classBigNumberUtil_html_a989cd5f389ac5adc798d8767383e2810"><div class="ttname"><a href="classBigNumberUtil.html#a989cd5f389ac5adc798d8767383e2810">BigNumberUtil::packLE</a></div><div class="ttdeci">static void packLE(uint8_t *bytes, size_t len, const limb_t *limbs, size_t count)</div><div class="ttdoc">Packs the little-endian byte representation of a big number into a byte array. </div><div class="ttdef"><b>Definition:</b> <a href="BigNumberUtil_8cpp_source.html#l00208">BigNumberUtil.cpp:208</a></div></div>
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<div class="ttc" id="classBigNumberUtil_html_ab9a9f532fcfc182433adac44d8e4ee20"><div class="ttname"><a href="classBigNumberUtil.html#ab9a9f532fcfc182433adac44d8e4ee20">BigNumberUtil::add_P</a></div><div class="ttdeci">static limb_t add_P(limb_t *result, const limb_t *x, const limb_t *y, size_t size)</div><div class="ttdoc">Adds two big numbers where one of them is in program memory. </div><div class="ttdef"><b>Definition:</b> <a href="BigNumberUtil_8cpp_source.html#l00514">BigNumberUtil.cpp:514</a></div></div>
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