Alexandre Lision | 7fd5d3d | 2013-12-04 13:06:40 -0500 | [diff] [blame] | 1 | /* |
| 2 | Copyright (C) 2006-2013 Werner Dittmann |
| 3 | |
| 4 | This program is free software: you can redistribute it and/or modify |
| 5 | it under the terms of the GNU Lesser General Public License as published by |
| 6 | the Free Software Foundation, either version 3 of the License, or |
| 7 | (at your option) any later version. |
| 8 | |
| 9 | This program is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | GNU General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU General Public License |
| 15 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #ifndef _ZRTPRANDOM_H_ |
| 19 | #define _ZRTPRANDOM_H_ |
| 20 | |
| 21 | /** |
| 22 | * @file ZrtpCommon.h |
| 23 | * @brief ZRTP standalone random number generator |
| 24 | * @defgroup GNU_ZRTP The GNU ZRTP C++ implementation |
| 25 | * @{ |
| 26 | */ |
| 27 | |
| 28 | #include <string.h> |
| 29 | #if !(defined(_WIN32) || defined(_WIN64)) |
| 30 | #include <unistd.h> |
| 31 | #endif |
| 32 | #include <stdint.h> |
| 33 | #include <sys/types.h> |
| 34 | |
| 35 | #ifdef __cplusplus |
| 36 | class ZrtpRandom { |
| 37 | public: |
| 38 | /** |
| 39 | * @brief This method adds entropy to the PRNG. |
| 40 | * |
| 41 | * An application may seed some entropy data to the PRNG. If the @c buffer is |
| 42 | * @c NULL or the @c length is zero then the method adds at least some system |
| 43 | * entropy. |
| 44 | * |
| 45 | * @param buffer some entropy data to add |
| 46 | * |
| 47 | * @param length length of entropy data in bytes |
| 48 | * |
| 49 | * @return on success: number of entropy bytes added, on failure: -1. Number of |
| 50 | * bytes added may be bigger then @c length because of added system |
| 51 | * entropy. |
| 52 | */ |
| 53 | static int addEntropy(const uint8_t *buffer, uint32_t length); |
| 54 | |
| 55 | /** |
| 56 | * @brief Get some random data. |
| 57 | * |
| 58 | * @param buffer that will contain the random data |
| 59 | * |
| 60 | * @param length how many bytes of random data to generate |
| 61 | * |
| 62 | * @return the number of generated random data bytes |
| 63 | */ |
| 64 | static int getRandomData(uint8_t *buffer, uint32_t length); |
| 65 | |
| 66 | private: |
| 67 | static void initialize(); |
| 68 | static size_t getSystemSeed(uint8_t *seed, size_t length); |
| 69 | |
| 70 | }; |
| 71 | #endif |
| 72 | |
| 73 | #ifdef __cplusplus |
| 74 | extern "C" |
| 75 | { |
| 76 | #endif |
| 77 | |
| 78 | int zrtp_AddEntropy(const uint8_t *buffer, uint32_t length); |
| 79 | |
| 80 | int zrtp_getRandomData(uint8_t *buffer, uint32_t length); |
| 81 | |
| 82 | #ifdef __cplusplus |
| 83 | } |
| 84 | #endif |
| 85 | |
| 86 | #endif /* ZRTPRANDOM */ |