Alexandre Lision | 907ed2e | 2014-02-04 10:33:09 -0500 | [diff] [blame] | 1 | /* |
| 2 | Copyright (C) 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 | /** |
| 19 | * Functions to compute Skein384 digest. |
| 20 | * |
| 21 | * @author: Werner Dittmann <Werner.Dittmann@t-online.de> |
| 22 | */ |
| 23 | |
| 24 | #ifndef _SKEIN384_H |
| 25 | #define _SKEIN384_H |
| 26 | |
| 27 | /** |
| 28 | * @file skein384.h |
| 29 | * @brief Functions that provide Skein384 support |
| 30 | * |
| 31 | * @ingroup GNU_ZRTP |
| 32 | * @{ |
| 33 | */ |
| 34 | |
| 35 | #include <stdint.h> |
| 36 | |
| 37 | #ifndef SKEIN384_DIGEST_LENGTH |
| 38 | #define SKEIN384_DIGEST_LENGTH 48 |
| 39 | #endif |
| 40 | #define SKEIN_SIZE Skein512 |
| 41 | |
| 42 | |
| 43 | /** |
| 44 | * Compute Skein384 digest. |
| 45 | * |
| 46 | * This functions takes one data chunk and computes its Skein384 digest. This |
| 47 | * function creates and deletes an own Skein384 context to perform the Skein384 |
| 48 | * operations. |
| 49 | * |
| 50 | * @param data |
| 51 | * Points to the data chunk. |
| 52 | * @param data_length |
| 53 | * Length of the data in bytes |
| 54 | * @param digest |
| 55 | * Points to a buffer that receives the computed digest. This |
| 56 | * buffer must have a size of at least 48 bytes (Skein384_DIGEST_LENGTH). |
| 57 | */ |
| 58 | void skein384(unsigned char *data, |
| 59 | unsigned int data_length, |
| 60 | unsigned char *digest); |
| 61 | |
| 62 | /** |
| 63 | * Compute Skein384 digest over several data cunks. |
| 64 | * |
| 65 | * This functions takes several data chunks and computes the Skein384 digest. |
| 66 | * This function creates and deletes an own Skein384 context to perform the |
| 67 | * Skein384 operations. |
| 68 | * |
| 69 | * @param data |
| 70 | * Points to an array of pointers that point to the data chunks. A NULL |
| 71 | * pointer in an array element terminates the data chunks. |
| 72 | * @param data_length |
| 73 | * Points to an array of integers that hold the length of each data chunk. |
| 74 | * @param digest |
| 75 | * Points to a buffer that receives the computed digest. This |
| 76 | * buffer must have a size of at least 48 bytes (Skein384_DIGEST_LENGTH). |
| 77 | */ |
| 78 | void skein384(unsigned char *data[], |
| 79 | unsigned int data_length[], |
| 80 | unsigned char *digest); |
| 81 | /** |
| 82 | * Create and initialize a Skein384 context. |
| 83 | * |
| 84 | * An application uses this context to hash several data into one Skein384 |
| 85 | * digest. See also skein384Ctx(...) and closeSha384Context(...). |
| 86 | * |
| 87 | * @return Returns a pointer to the initialized Skein384 context |
| 88 | */ |
| 89 | void* createSkein384Context(); |
| 90 | |
| 91 | /** |
| 92 | * Compute a digest and close the SHa384 digest. |
| 93 | * |
| 94 | * An application uses this function to compute the Skein384 digest and to |
| 95 | * close the Skein384 context. |
| 96 | * |
| 97 | * @param ctx |
| 98 | * Points to the Skein384 context. |
| 99 | * @param digest |
| 100 | * If this pointer is not NULL then it must point to a byte array that |
| 101 | * is big enough to hold the Skein384 digest (384 bit = 48 Bytes). If this |
| 102 | * pointer is NULL then the functions does not compute the digest but |
| 103 | * closes the context only. The context cannot be used anymore. |
| 104 | */ |
| 105 | void closeSkein384Context(void* ctx, |
| 106 | unsigned char* digest); |
| 107 | |
| 108 | /** |
| 109 | * Update the Skein384 context with data. |
| 110 | * |
| 111 | * This functions updates the Skein384 context with some data. |
| 112 | * See also CloseSha384Context(...) how to get the digest. |
| 113 | * |
| 114 | * @param ctx |
| 115 | * Points to the Skein384 context. |
| 116 | * @param data |
| 117 | * Points to the data to update the context. |
| 118 | * @param dataLength |
| 119 | * The length of the data in bytes. |
| 120 | */ |
| 121 | void skein384Ctx(void* ctx, unsigned char* data, |
| 122 | unsigned int dataLength); |
| 123 | |
| 124 | /** |
| 125 | * Update the Skein384 context with several data chunks. |
| 126 | * |
| 127 | * This functions updates the Skein384 context with some data. |
| 128 | * See also CloseSha384Context(...) how to get the digest. |
| 129 | * |
| 130 | * @param ctx |
| 131 | * Points to the Skein384 context. |
| 132 | * @param dataChunks |
| 133 | * Points to an array of pointers that point to the data chunks. A NULL |
| 134 | * pointer in an array element terminates the data chunks. |
| 135 | * @param dataChunkLength |
| 136 | * Points to an array of integers that hold the length of each data chunk. |
| 137 | * |
| 138 | */ |
| 139 | void skein384Ctx(void* ctx, unsigned char* dataChunks[], |
| 140 | unsigned int dataChunkLength[]); |
| 141 | |
| 142 | /** |
| 143 | * @} |
| 144 | */ |
| 145 | #endif |
| 146 | |