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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/* crypt.h -- base code for crypt/uncrypt ZIPfile</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"></span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"></span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> Version 1.01e, February 12th, 2005</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"></span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> Copyright (C) 1998-2005 Gilles Vollant</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"></span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> This code is a modified version of crypting code in Infozip distribution</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"></span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> The encryption/decryption parts of this source code (as opposed to the</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> non-echoing password parts) were originally written in Europe. The</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> whole source package can be freely distributed, including from the USA.</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> (Prior to January 2000, re-export from the US was a violation of US law.)</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"></span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> This encryption code is a direct transcription of the algorithm from</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> Roger Schlafly, described by Phil Katz in the file appnote.txt. This</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> file (appnote.txt) is distributed with the PKZIP program (even in the</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> version without encryption capabilities).</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"></span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> If you don't need crypting in your application, just define symbols</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> NOCRYPT and NOUNCRYPT.</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"></span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> This code support the "Traditional PKWARE Encryption".</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"></span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> The new AES encryption added on Zip format by Winzip (see the page</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> http://www.winzip.com/aes_info.htm ) and PKWare PKZip 5.x Strong</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> Encryption is not supported.</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">*/</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include "quazip_global.h"</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> <span class="preprocessor">#define CRC32(c, b) ((*(pcrc_32_tab+(((int)(c) ^ (b)) & 0xff))) ^ ((c) >> 8))</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> <span class="comment">/***********************************************************************</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * Return the next byte in the pseudo-random sequence</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> */</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="keyword">static</span> <span class="keywordtype">int</span> decrypt_byte(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>* pkeys, <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>* pcrc_32_tab UNUSED)</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>  <span class="comment">//(void) pcrc_32_tab; /* avoid "unused parameter" warning */</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordtype">unsigned</span> temp; <span class="comment">/* POTENTIAL BUG: temp*(temp^1) may overflow in an</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> * unpredictable manner on 16-bit systems; not a problem</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> * with any known compiler so far, though */</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  temp = ((unsigned)(*(pkeys+2)) & 0xffff) | 2;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">return</span> (<span class="keywordtype">int</span>)(((temp * (temp ^ 1)) >> 8) & 0xff);</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> <span class="comment">/***********************************************************************</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * Update the encryption keys with the next byte of plain text</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> */</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="keyword">static</span> <span class="keywordtype">int</span> update_keys(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>* pkeys,<span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>* pcrc_32_tab,<span class="keywordtype">int</span> c)</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> {</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  (*(pkeys+0)) = CRC32((*(pkeys+0)), c);</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  (*(pkeys+1)) += (*(pkeys+0)) & 0xff;</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  (*(pkeys+1)) = (*(pkeys+1)) * 134775813L + 1;</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  {</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keyword">register</span> <span class="keywordtype">int</span> keyshift = (int)((*(pkeys+1)) >> 24);</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  (*(pkeys+2)) = CRC32((*(pkeys+2)), keyshift);</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  }</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">return</span> c;</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> }</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> </div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment">/***********************************************************************</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"> * Initialize the encryption keys and the random header according to</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"> * the given password.</span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"> */</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="keyword">static</span> <span class="keywordtype">void</span> init_keys(<span class="keyword">const</span> <span class="keywordtype">char</span>* passwd,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>* pkeys,<span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>* pcrc_32_tab)</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> {</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  *(pkeys+0) = 305419896L;</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  *(pkeys+1) = 591751049L;</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  *(pkeys+2) = 878082192L;</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">while</span> (*passwd != <span class="charliteral">'\0'</span>) {</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  update_keys(pkeys,pcrc_32_tab,(<span class="keywordtype">int</span>)*passwd);</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  passwd++;</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> }</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> </div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="preprocessor">#define zdecode(pkeys,pcrc_32_tab,c) \</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="preprocessor"> (update_keys(pkeys,pcrc_32_tab,c ^= decrypt_byte(pkeys,pcrc_32_tab)))</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="preprocessor">#define zencode(pkeys,pcrc_32_tab,c,t) \</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="preprocessor"> (t=decrypt_byte(pkeys,pcrc_32_tab), update_keys(pkeys,pcrc_32_tab,c), t^(c))</span></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> <span class="preprocessor">#ifdef INCLUDECRYPTINGCODE_IFCRYPTALLOWED</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="preprocessor">#define RAND_HEAD_LEN 12</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="comment">/* "last resort" source for second part of crypt seed pattern */</span></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="preprocessor"># ifndef ZCR_SEED2</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="preprocessor"># define ZCR_SEED2 3141592654UL </span><span class="comment">/* use PI as default pattern */</span><span class="preprocessor"></span></div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="preprocessor"># endif</span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="keyword">static</span> <span class="keywordtype">int</span> crypthead(passwd, buf, bufSize, pkeys, pcrc_32_tab, crcForCrypting)</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keyword">const</span> <span class="keywordtype">char</span> *passwd; <span class="comment">/* password string */</span></div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *buf; <span class="comment">/* where to write header */</span></div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordtype">int</span> bufSize;</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>* pkeys;</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>* pcrc_32_tab;</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> crcForCrypting;</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> {</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordtype">int</span> n; <span class="comment">/* index in random header */</span></div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordtype">int</span> t; <span class="comment">/* temporary */</span></div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordtype">int</span> c; <span class="comment">/* random byte */</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> header[RAND_HEAD_LEN-2]; <span class="comment">/* random header */</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keyword">static</span> <span class="keywordtype">unsigned</span> calls = 0; <span class="comment">/* ensure different random header each time */</span></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> </div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">if</span> (bufSize<RAND_HEAD_LEN)</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">return</span> 0;</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>  <span class="comment">/* First generate RAND_HEAD_LEN-2 random bytes. We encrypt the</span></div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"> * output of rand() to get less predictability, since rand() is</span></div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="comment"> * often poorly implemented.</span></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="comment"> */</span></div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">if</span> (++calls == 1)</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>  srand((<span class="keywordtype">unsigned</span>)(time(NULL) ^ ZCR_SEED2));</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>  init_keys(passwd, pkeys, pcrc_32_tab);</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">for</span> (n = 0; n < RAND_HEAD_LEN-2; n++)</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  {</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  c = (rand() >> 7) & 0xff;</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  header[n] = (<span class="keywordtype">unsigned</span> char)zencode(pkeys, pcrc_32_tab, c, t);</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  }</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="comment">/* Encrypt random header (last two bytes is high word of crc) */</span></div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  init_keys(passwd, pkeys, pcrc_32_tab);</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">for</span> (n = 0; n < RAND_HEAD_LEN-2; n++)</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>  buf[n] = (<span class="keywordtype">unsigned</span> char)zencode(pkeys, pcrc_32_tab, header[n], t);</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>  buf[n++] = zencode(pkeys, pcrc_32_tab, (<span class="keywordtype">int</span>)(crcForCrypting >> 16) & 0xff, t);</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  buf[n++] = zencode(pkeys, pcrc_32_tab, (<span class="keywordtype">int</span>)(crcForCrypting >> 24) & 0xff, t);</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordflow">return</span> n;</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> <span class="preprocessor">#endif</span></div></div><!-- fragment --></div><!-- contents -->
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