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1 /* |
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2 * Hash.h -- hash functions |
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3 * |
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4 * Copyright (c) 2014 David Demelier <markand@malikania.fr> |
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5 * |
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6 * Permission to use, copy, modify, and/or distribute this software for any |
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7 * purpose with or without fee is hereby granted, provided that the above |
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8 * copyright notice and this permission notice appear in all copies. |
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9 * |
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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17 */ |
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18 |
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19 #ifndef _HASH_H_ |
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20 #define _HASH_H_ |
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21 |
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22 /** |
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23 * @file Hash.h |
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24 * @brief Hash functions |
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25 */ |
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26 |
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27 #include <string> |
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28 |
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29 /** |
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30 * @class Hash |
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31 * @brief Hash functions |
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32 * |
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33 * Provide support for MD5, SHA1, SHA256 and SHA512. |
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34 */ |
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35 class Hash { |
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36 private: |
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37 template <typename Context> |
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38 using Init = int (*)(Context *); |
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39 |
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40 template <typename Context> |
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41 using Update = int (*)(Context *, const void *, size_t); |
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42 |
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43 template <typename Context> |
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44 using Final = int (*)(unsigned char *, Context *); |
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45 |
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46 template <typename Context, size_t Length> |
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47 static std::string convert(const std::string &input, |
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48 Init<Context> init, |
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49 Update<Context> update, |
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50 Final<Context> finalize) |
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51 { |
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52 unsigned char digest[Length]; |
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53 char hash[Length * 2 + 1]; |
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54 |
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55 Context ctx; |
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56 init(&ctx); |
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57 update(&ctx, input.c_str(), input.length()); |
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58 finalize(digest, &ctx); |
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59 |
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60 for (int i = 0; i < Length; i++) |
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61 sprintf(&hash[i * 2], "%02x", (unsigned int)digest[i]); |
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62 |
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63 return std::string(hash); |
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64 } |
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65 |
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66 public: |
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67 /** |
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68 * Hash using MD5. |
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69 * |
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70 * @param input the input string |
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71 * @return the hashed string |
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72 */ |
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73 static std::string md5(const std::string &input); |
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74 |
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75 /** |
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76 * Hash using SHA1. |
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77 * |
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78 * @param input the input string |
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79 * @return the hashed string |
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80 */ |
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81 static std::string sha1(const std::string &input); |
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82 |
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83 /** |
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84 * Hash using SHA256. |
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85 * |
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86 * @param input the input string |
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87 * @return the hashed string |
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88 */ |
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89 static std::string sha256(const std::string &input); |
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90 |
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91 /** |
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92 * Hash using SHA512. |
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93 * |
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94 * @param input the input string |
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95 * @return the hashed string |
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96 */ |
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97 static std::string sha512(const std::string &input); |
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98 }; |
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99 |
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100 #endif // !_HASH_H_ |
