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16 KiB
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<div id="projectname">libpcp
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 <span id="projectnumber">0.2.1</span>
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<li class="navelem"><a class="el" href="dir_d44c64559bbebec7f509842c48db8b23.html">include</a></li><li class="navelem"><a class="el" href="dir_76e3dfa7802a76391b3a5cc4012b4dd7.html">pcp</a></li> </ul>
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<div class="header">
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<div class="headertitle">
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<div class="title">pad.h</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"> This file is part of Pretty Curved Privacy (pcp1).</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"> Copyright (C) 2013 T.Linden.</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"></span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> This program is free software: you can redistribute it and/or modify</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> it under the terms of the GNU General Public License as published by</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> the Free Software Foundation, either version 3 of the License, or</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> (at your option) any later version.</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"> This program is distributed in the hope that it will be useful,</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> GNU General Public License for more details.</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"></span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> You should have received a copy of the GNU General Public License</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> along with this program. If not, see <http://www.gnu.org/licenses/>.</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"></span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> You can contact me by mail: <tlinden AT cpan DOT org>.</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">*/</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</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">#ifndef _HAVE_PCP_ZPADDING</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor"></span><span class="preprocessor">#define _HAVE_PCP_ZPADDING</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <stdio.h></span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include <string.h></span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include <stdlib.h></span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include <stdlib.h></span></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include <limits.h></span></div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#include "mem.h"</span></div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#ifdef DEBUG</span></div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor"></span><span class="preprocessor">#define ZPADCHAR 48</span></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor"></span><span class="preprocessor">#else</span></div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor"></span><span class="preprocessor">#define ZPADCHAR 0</span></div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor"></span><span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment">/* prepends a binary stream with a number of */</span></div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment">/* \0's as required by the secret_box and */</span></div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment">/* secret_box_open functions of libsodium. */</span></div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment">/* */</span></div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment">/* parameters: */</span></div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment">/* */</span></div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment">/* padded: destination array (ref) */</span></div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment">/* unpadded: source array without padding */</span></div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">/* padlen: length of padding */</span></div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment">/* unpadlen: length of source array */</span></div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment">/* */</span></div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment">/* turns "efa5" into "00000000efa5" with padlen 8 */</span></div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment">/* */</span></div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment">/* if DEBUG is set, destination will be padded with */</span></div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment">/* the character '0', NOT the integer 0. */</span></div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment">/* */</span></div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment">/* allocates memory for padded and it is up to the */</span></div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment">/* user to free it after use. */</span></div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment">/* */</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment">/* sample call: */</span></div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment">/* */</span></div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment">/* char unpadded[] = {0xef, 0xa5}; */</span></div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment">/* unsigned char *padded; */</span></div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment">/* pcp_pad_prepend(&padded, unpadded, 8, 2); */</span></div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment">/* */</span></div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">/* the result, padded, would be 10 bytes long, 8 */</span></div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment">/* bytes for the leading zeros and 2 for the content */</span></div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment">/* of the original unpadded. */</span></div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="keywordtype">void</span> pcp_pad_prepend(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> **padded, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *unpadded,</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordtype">size_t</span> padlen, <span class="keywordtype">size_t</span> unpadlen);</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment">/* removes zero's of a binary stream, which is */</span></div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment">/* the reverse of pcp_pad_prepend(). */</span></div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment">/* */</span></div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment">/* parameters: */</span></div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment">/* */</span></div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment">/* unpadded: destination array (ref), with padding removed */</span></div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment">/* padded: source array with padding */</span></div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment">/* padlen: length of padding */</span></div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment">/* unpadlen: length of source array */</span></div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment">/* */</span></div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment">/* turns "00000000efa5" into "efa5" with padlen 8 */</span></div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment">/* */</span></div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment">/* allocates memory for unpadded and it is up to the */</span></div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment">/* user to free it after use. */</span></div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment">/* */</span></div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment">/* sample call: */</span></div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment">/* */</span></div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment">/* char padded[] = {0x0, 0x0, 0x0, 0x0, 0xef, 0xa5}; */</span></div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment">/* unsigned char *unpadded; */</span></div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment">/* pcp_pad_remove(unpadded, padded, 4, 2); */</span></div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment">/* */</span></div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment">/* the result, unpadded would be 2 bytes long containing */</span></div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment">/* only the 2 bytes we want to have with zeros removed. */</span></div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="keywordtype">void</span> pcp_pad_remove(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> **unpadded, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *padded,</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordtype">size_t</span> padlen, <span class="keywordtype">size_t</span> unpadlen);</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> </div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="preprocessor">#endif </span><span class="comment">/* _HAVE_PCP_ZPADDING */</span><span class="preprocessor"></span></div>
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</div><!-- fragment --></div><!-- contents -->
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