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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege,
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178
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4 * Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #pragma once
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34
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35 #include "DicomMap.h"
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36
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37 namespace Orthanc
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38 {
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39 /**
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40 * This class implements the hashing mechanism that is used to
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41 * convert DICOM unique identifiers to Orthanc identifiers. Any
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42 * Orthanc identifier for a DICOM resource corresponds to the SHA-1
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43 * hash of the DICOM identifiers.
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44
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45 * \note SHA-1 hash is used because it is less sensitive to
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46 * collision attacks than MD5. <a
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47 * href="http://en.wikipedia.org/wiki/SHA-256#Comparison_of_SHA_functions">[Reference]</a>
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48 **/
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49 class DicomInstanceHasher
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50 {
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51 private:
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52 std::string patientId_;
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53 std::string studyUid_;
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54 std::string seriesUid_;
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55 std::string instanceUid_;
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56
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57 std::string patientHash_;
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58 std::string studyHash_;
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59 std::string seriesHash_;
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60 std::string instanceHash_;
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61
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62 void Setup(const std::string& patientId,
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63 const std::string& studyUid,
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64 const std::string& seriesUid,
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65 const std::string& instanceUid);
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66
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67 public:
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68 DicomInstanceHasher(const DicomMap& instance);
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69
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70 DicomInstanceHasher(const std::string& patientId,
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71 const std::string& studyUid,
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72 const std::string& seriesUid,
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73 const std::string& instanceUid)
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74 {
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75 Setup(patientId, studyUid, seriesUid, instanceUid);
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76 }
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77
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78 const std::string& GetPatientId() const
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79 {
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80 return patientId_;
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81 }
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82
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83 const std::string& GetStudyUid() const
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84 {
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85 return studyUid_;
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86 }
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87
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88 const std::string& GetSeriesUid() const
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89 {
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90 return seriesUid_;
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91 }
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92
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93 const std::string& GetInstanceUid() const
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94 {
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95 return instanceUid_;
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96 }
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97
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98 const std::string& HashPatient();
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99
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100 const std::string& HashStudy();
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101
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102 const std::string& HashSeries();
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103
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104 const std::string& HashInstance();
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105 };
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106 }
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