<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <meta name="generator" content="Doxygen 1.8.14"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <title>Crypto++: rdrand.asm Source File</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="dynsections.js"></script> <link href="doxygen.css" rel="stylesheet" type="text/css" /> </head> <body> <div id="top"><!-- do not remove this div, it is closed by doxygen! --> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 56px;"> <td id="projectalign" style="padding-left: 0.5em;"> <div id="projectname">Crypto++  <span id="projectnumber">7.0</span> </div> <div id="projectbrief">Free C++ class library of cryptographic schemes</div> </td> </tr> </tbody> </table> </div> <!-- end header part --> <!-- Generated by Doxygen 1.8.14 --> <script type="text/javascript" src="menudata.js"></script> <script type="text/javascript" src="menu.js"></script> <script type="text/javascript"> /* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */ $(function() { initMenu('',false,false,'search.php','Search'); }); /* @license-end */</script> <div id="main-nav"></div> </div><!-- top --> <div class="header"> <div class="headertitle"> <div class="title">rdrand.asm</div> </div> </div><!--header--> <div class="contents"> <div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> ;; rdrand.asm - written and placed in public domain by Jeffrey Walton and Uri Blumenthal.</div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> ;; Copyright assigned to the Crypto++ project.</div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> </div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> ;; This ASM file provides RDRAND and RDSEED to downlevel Microsoft tool chains.</div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> ;; Everything "just works" under Visual Studio. Other platforms will have to</div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> ;; run MASM/MASM-64 and then link to the object files.</div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> ;; set ASFLAGS=/nologo /D_M_X86 /W3 /Cx /Zi /safeseh</div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> ;; set ASFLAGS64=/nologo /D_M_X64 /W3 /Cx /Zi</div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> ;; "C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\bin\ml.exe" %ASFLAGS% /Fo rdrand-x86.obj /c rdrand.asm</div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> ;; "C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\bin\amd64\ml64.exe" %ASFLAGS64% /Fo rdrand-x64.obj /c rdrand.asm</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> TITLE MASM_RDRAND_GenerateBlock and MASM_RDSEED_GenerateBlock</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> SUBTITLE Microsoft specific ASM code to utilize RDRAND and RDSEED for down level Microsoft toolchains</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> PUBLIC MASM_RDRAND_GenerateBlock</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> PUBLIC MASM_RDSEED_GenerateBlock</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> ;; C/C++ Function prototypes (both are fastcall)</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> ;; X86:</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> ;; extern "C" void __fastcall MASM_RDRAND_GenerateBlock(byte* ptr, size_t size);</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> ;; X64:</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> ;; extern "C" void __fastcall MASM_RDRAND_GenerateBlock(byte* ptr, size_t size);</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> </div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> IFDEF _M_X86 ;; Set via the command line</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> .486</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> .MODEL FLAT</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> ;; Fastcall calling conventions exports</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> ALIAS <@MASM_RDRAND_GenerateBlock@8> = <MASM_RDRAND_GenerateBlock></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> ALIAS <@MASM_RDSEED_GenerateBlock@8> = <MASM_RDSEED_GenerateBlock></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> ENDIF</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> IFDEF _M_X86 ;; Set via the command line</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> </div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> .CODE</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> ALIGN 8</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> OPTION PROLOGUE:NONE</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> OPTION EPILOGUE:NONE</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> </div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> ;; No need for Load_Arguments due to fastcall</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> ;; ECX (in): arg1, byte* buffer</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> ;; EDX (in): arg2, size_t bsize</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> MASM_RDRAND_GenerateBlock PROC ;; arg1:DWORD, arg2:DWORD</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> </div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  MWSIZE EQU 04h ;; machine word size</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  buffer EQU ecx</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  bsize EQU edx</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  ;; Top of While loop</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> GenerateBlock_Top:</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> </div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  ;; Check remaining size</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  cmp bsize, 0</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  je GenerateBlock_Return</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> Call_RDRAND_EAX:</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  ;; RDRAND is not available prior to VS2012. Just emit</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  ;; the byte codes using DB. This is `rdrand eax`.</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  DB 0Fh, 0C7h, 0F0h</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> </div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  ;; If CF=1, the number returned by RDRAND is valid.</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  ;; If CF=0, a random number was not available.</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  ;; Retry immediately</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  jnc Call_RDRAND_EAX</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> RDRAND_succeeded:</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  cmp bsize, MWSIZE</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  jb Partial_Machine_Word</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> Full_Machine_Word:</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  mov DWORD PTR [buffer], eax</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  add buffer, MWSIZE ;; No need for Intel Core 2 slow workarounds, like</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  sub bsize, MWSIZE ;; `lea buffer,[buffer+MWSIZE]` for faster adds</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> </div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  ;; Continue</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  jmp GenerateBlock_Top</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> </div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  ;; 1,2,3 bytes remain</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> Partial_Machine_Word:</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> </div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  ;; Test bit 1 to see if size is at least 2</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  test bsize, 2</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  jz Bit_1_Not_Set</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  mov WORD PTR [buffer], ax</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  shr eax, 16</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  add buffer, 2</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> Bit_1_Not_Set:</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> </div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  ;; Test bit 0 to see if size is at least 1</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  test bsize, 1</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  jz Bit_0_Not_Set</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> </div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  mov BYTE PTR [buffer], al</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> Bit_0_Not_Set:</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  ;; We've hit all the bits</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span> </div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> GenerateBlock_Return:</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> </div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  ;; Clear artifacts</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  xor eax, eax</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  ret</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span> </div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span> MASM_RDRAND_GenerateBlock ENDP</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span> ENDIF ;; _M_X86</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> OPTION PROLOGUE:PrologueDef</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> OPTION EPILOGUE:EpilogueDef</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span> </div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> </div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span> IFDEF _M_X64 ;; Set via the command line</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span> </div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> .CODE</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> ALIGN 16</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> OPTION PROLOGUE:NONE</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span> OPTION EPILOGUE:NONE</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> ;; No need for Load_Arguments due to fastcall</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> ;; RCX (in): arg1, byte* buffer</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> ;; RDX (in): arg2, size_t bsize</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> MASM_RDRAND_GenerateBlock PROC ;; arg1:QWORD, arg2:QWORD</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span> </div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  MWSIZE EQU 08h ;; machine word size</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  buffer EQU rcx</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  bsize EQU rdx</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>  ;; Top of While loop</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span> GenerateBlock_Top:</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span> </div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  ;; Check remaining size</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  cmp bsize, 0</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  je GenerateBlock_Return</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span> </div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span> Call_RDRAND_RAX:</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  ;; RDRAND is not available prior to VS2012. Just emit</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  ;; the byte codes using DB. This is `rdrand rax`.</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  DB 048h, 0Fh, 0C7h, 0F0h</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span> </div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  ;; If CF=1, the number returned by RDRAND is valid.</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  ;; If CF=0, a random number was not available.</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span> </div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  ;; Retry immediately</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  jnc Call_RDRAND_RAX</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span> </div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span> RDRAND_succeeded:</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span> </div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  cmp bsize, MWSIZE</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  jb Partial_Machine_Word</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span> </div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span> Full_Machine_Word:</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span> </div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  mov QWORD PTR [buffer], rax</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  add buffer, MWSIZE</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  sub bsize, MWSIZE</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span> </div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  ;; Continue</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  jmp GenerateBlock_Top</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span> </div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  ;; 1,2,3,4,5,6,7 bytes remain</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span> Partial_Machine_Word:</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>  ;; Test bit 2 to see if size is at least 4</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  test bsize, 4</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  jz Bit_2_Not_Set</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span> </div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  mov DWORD PTR [buffer], eax</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  shr rax, 32</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  add buffer, 4</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span> </div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span> Bit_2_Not_Set:</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span> </div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  ;; Test bit 1 to see if size is at least 2</div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  test bsize, 2</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  jz Bit_1_Not_Set</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span> </div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  mov WORD PTR [buffer], ax</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  shr eax, 16</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  add buffer, 2</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span> </div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span> Bit_1_Not_Set:</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span> </div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  ;; Test bit 0 to see if size is at least 1</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  test bsize, 1</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  jz Bit_0_Not_Set</div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span> </div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  mov BYTE PTR [buffer], al</div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span> </div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span> Bit_0_Not_Set:</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span> </div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  ;; We've hit all the bits</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> GenerateBlock_Return:</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span> </div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  ;; Clear artifacts</div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  xor rax, rax</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  ret</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span> </div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span> MASM_RDRAND_GenerateBlock ENDP</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> ENDIF ;; _M_X64</div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span> </div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span> OPTION PROLOGUE:PrologueDef</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span> OPTION EPILOGUE:EpilogueDef</div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span> </div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span> </div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span> IFDEF _M_X86 ;; Set via the command line</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> .CODE</div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span> ALIGN 8</div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span> OPTION PROLOGUE:NONE</div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span> OPTION EPILOGUE:NONE</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> ;; No need for Load_Arguments due to fastcall</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span> ;; ECX (in): arg1, byte* buffer</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span> ;; EDX (in): arg2, size_t bsize</div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span> </div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span> MASM_RDSEED_GenerateBlock PROC ;; arg1:DWORD, arg2:DWORD</div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span> </div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  MWSIZE EQU 04h ;; machine word size</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  buffer EQU ecx</div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  bsize EQU edx</div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span> </div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  ;; Top of While loop</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span> GenerateBlock_Top:</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>  ;; Check remaining size</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  cmp bsize, 0</div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  je GenerateBlock_Return</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span> </div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span> Call_RDSEED_EAX:</div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  ;; RDSEED is not available prior to VS2012. Just emit</div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  ;; the byte codes using DB. This is `rdseed eax`.</div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  DB 0Fh, 0C7h, 0F8h</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span> </div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  ;; If CF=1, the number returned by RDSEED is valid.</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  ;; If CF=0, a random number was not available.</div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span> </div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  ;; Retry immediately</div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  jnc Call_RDSEED_EAX</div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span> </div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span> RDSEED_succeeded:</div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span> </div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  cmp bsize, MWSIZE</div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  jb Partial_Machine_Word</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> Full_Machine_Word:</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span> </div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  mov DWORD PTR [buffer], eax</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  add buffer, MWSIZE ;; No need for Intel Core 2 slow workarounds, like</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  sub bsize, MWSIZE ;; `lea buffer,[buffer+MWSIZE]` for faster adds</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span> </div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  ;; Continue</div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  jmp GenerateBlock_Top</div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span> </div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  ;; 1,2,3 bytes remain</div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span> Partial_Machine_Word:</div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span> </div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  ;; Test bit 1 to see if size is at least 2</div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  test bsize, 2</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  jz Bit_1_Not_Set</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span> </div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  mov WORD PTR [buffer], ax</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  shr eax, 16</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  add buffer, 2</div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span> </div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span> Bit_1_Not_Set:</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span> </div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  ;; Test bit 0 to see if size is at least 1</div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  test bsize, 1</div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  jz Bit_0_Not_Set</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span> </div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  mov BYTE PTR [buffer], al</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span> </div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span> Bit_0_Not_Set:</div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span> </div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  ;; We've hit all the bits</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> GenerateBlock_Return:</div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span> </div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  ;; Clear artifacts</div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  xor eax, eax</div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  ret</div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span> </div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span> MASM_RDSEED_GenerateBlock ENDP</div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span> </div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span> ENDIF ;; _M_X86</div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span> </div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span> OPTION PROLOGUE:PrologueDef</div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span> OPTION EPILOGUE:EpilogueDef</div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span> </div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</div><div class="line"><a name="l00320"></a><span class="lineno"> 320</span> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span> </div><div class="line"><a name="l00322"></a><span class="lineno"> 322</span> IFDEF _M_X64 ;; Set via the command line</div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span> </div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span> .CODE</div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span> ALIGN 16</div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span> OPTION PROLOGUE:NONE</div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span> OPTION EPILOGUE:NONE</div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span> </div><div class="line"><a name="l00329"></a><span class="lineno"> 329</span> ;; No need for Load_Arguments due to fastcall</div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span> ;; RCX (in): arg1, byte* buffer</div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span> ;; RDX (in): arg2, size_t bsize</div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span> </div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span> MASM_RDSEED_GenerateBlock PROC ;; arg1:QWORD, arg2:QWORD</div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span> </div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  MWSIZE EQU 08h ;; machine word size</div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  buffer EQU rcx</div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  bsize EQU rdx</div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span> </div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  ;; Top of While loop</div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span> GenerateBlock_Top:</div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span> </div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  ;; Check remaining size</div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  cmp bsize, 0</div><div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  je GenerateBlock_Return</div><div class="line"><a name="l00345"></a><span class="lineno"> 345</span> </div><div class="line"><a name="l00346"></a><span class="lineno"> 346</span> Call_RDSEED_RAX:</div><div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  ;; RDSEED is not available prior to VS2012. Just emit</div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  ;; the byte codes using DB. This is `rdseed rax`.</div><div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  DB 048h, 0Fh, 0C7h, 0F8h</div><div class="line"><a name="l00350"></a><span class="lineno"> 350</span> </div><div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  ;; If CF=1, the number returned by RDSEED is valid.</div><div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  ;; If CF=0, a random number was not available.</div><div class="line"><a name="l00353"></a><span class="lineno"> 353</span> </div><div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  ;; Retry immediately</div><div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  jnc Call_RDSEED_RAX</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> RDSEED_succeeded:</div><div class="line"><a name="l00358"></a><span class="lineno"> 358</span> </div><div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  cmp bsize, MWSIZE</div><div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  jb Partial_Machine_Word</div><div class="line"><a name="l00361"></a><span class="lineno"> 361</span> </div><div class="line"><a name="l00362"></a><span class="lineno"> 362</span> Full_Machine_Word:</div><div class="line"><a name="l00363"></a><span class="lineno"> 363</span> </div><div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  mov QWORD PTR [buffer], rax</div><div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  add buffer, MWSIZE</div><div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  sub bsize, MWSIZE</div><div class="line"><a name="l00367"></a><span class="lineno"> 367</span> </div><div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  ;; Continue</div><div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  jmp GenerateBlock_Top</div><div class="line"><a name="l00370"></a><span class="lineno"> 370</span> </div><div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  ;; 1,2,3,4,5,6,7 bytes remain</div><div class="line"><a name="l00372"></a><span class="lineno"> 372</span> Partial_Machine_Word:</div><div class="line"><a name="l00373"></a><span class="lineno"> 373</span> </div><div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  ;; Test bit 2 to see if size is at least 4</div><div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  test bsize, 4</div><div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  jz Bit_2_Not_Set</div><div class="line"><a name="l00377"></a><span class="lineno"> 377</span> </div><div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  mov DWORD PTR [buffer], eax</div><div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  shr rax, 32</div><div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  add buffer, 4</div><div class="line"><a name="l00381"></a><span class="lineno"> 381</span> </div><div class="line"><a name="l00382"></a><span class="lineno"> 382</span> Bit_2_Not_Set:</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>  ;; Test bit 1 to see if size is at least 2</div><div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  test bsize, 2</div><div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  jz Bit_1_Not_Set</div><div class="line"><a name="l00387"></a><span class="lineno"> 387</span> </div><div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  mov WORD PTR [buffer], ax</div><div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  shr eax, 16</div><div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  add buffer, 2</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> Bit_1_Not_Set:</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>  ;; Test bit 0 to see if size is at least 1</div><div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  test bsize, 1</div><div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  jz Bit_0_Not_Set</div><div class="line"><a name="l00397"></a><span class="lineno"> 397</span> </div><div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  mov BYTE PTR [buffer], al</div><div class="line"><a name="l00399"></a><span class="lineno"> 399</span> </div><div class="line"><a name="l00400"></a><span class="lineno"> 400</span> Bit_0_Not_Set:</div><div class="line"><a name="l00401"></a><span class="lineno"> 401</span> </div><div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  ;; We've hit all the bits</div><div class="line"><a name="l00403"></a><span class="lineno"> 403</span> </div><div class="line"><a name="l00404"></a><span class="lineno"> 404</span> GenerateBlock_Return:</div><div class="line"><a name="l00405"></a><span class="lineno"> 405</span> </div><div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  ;; Clear artifacts</div><div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  xor rax, rax</div><div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  ret</div><div class="line"><a name="l00409"></a><span class="lineno"> 409</span> </div><div class="line"><a name="l00410"></a><span class="lineno"> 410</span> MASM_RDSEED_GenerateBlock ENDP</div><div class="line"><a name="l00411"></a><span class="lineno"> 411</span> </div><div class="line"><a name="l00412"></a><span class="lineno"> 412</span> ENDIF ;; _M_X64</div><div class="line"><a name="l00413"></a><span class="lineno"> 413</span> </div><div class="line"><a name="l00414"></a><span class="lineno"> 414</span> OPTION PROLOGUE:PrologueDef</div><div class="line"><a name="l00415"></a><span class="lineno"> 415</span> OPTION EPILOGUE:EpilogueDef</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> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;</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="l00420"></a><span class="lineno"> 420</span> END</div></div><!-- fragment --></div><!-- contents --> <!-- start footer part --> <hr class="footer"/><address class="footer"><small> Generated on Sun Sep 16 2018 07:58:00 for Crypto++ by  <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/> </a> 1.8.14 </small></address> </body> </html>