projects / thirdparty / nettle.git / blame
| Commit | Line | Data |
|---|---|---|
| 12bb2223 NM |
1 | /* md-internal.h |
| 2 | ||
| 3 | Copyright (C) 2001, 2010, 2022 Niels Möller | |
| 4 | ||
| 5 | This file is part of GNU Nettle. | |
| 6 | ||
| 7 | GNU Nettle is free software: you can redistribute it and/or | |
| 8 | modify it under the terms of either: | |
| 9 | ||
| 10 | * the GNU Lesser General Public License as published by the Free | |
| 11 | Software Foundation; either version 3 of the License, or (at your | |
| 12 | option) any later version. | |
| 13 | ||
| 14 | or | |
| 15 | ||
| 16 | * the GNU General Public License as published by the Free | |
| 17 | Software Foundation; either version 2 of the License, or (at your | |
| 18 | option) any later version. | |
| 19 | ||
| 20 | or both in parallel, as here. | |
| 21 | ||
| 22 | GNU Nettle is distributed in the hope that it will be useful, | |
| 23 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 24 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 25 | General Public License for more details. | |
| 26 | ||
| 27 | You should have received copies of the GNU General Public License and | |
| 28 | the GNU Lesser General Public License along with this program. If | |
| 29 | not, see http://www.gnu.org/licenses/. | |
| 30 | */ | |
| 31 | ||
| 32 | #ifndef NETTLE_MD_INTERNAL_H_INCLUDED | |
| 33 | #define NETTLE_MD_INTERNAL_H_INCLUDED | |
| 34 | ||
| bb9c0a1e NM |
35 | #include <string.h> |
| 36 | ||
| 12bb2223 NM |
37 | /* Internal helper macros for Merkle-Damgård hash functions. Assumes the context |
| 38 | structs includes the following fields: | |
| 39 | ||
| 40 | uint8_t block[...]; // Buffer holding one block | |
| 41 | unsigned int index; // Index into block | |
| 42 | */ | |
| 43 | ||
| 44 | #define MD_FILL_OR_RETURN(ctx, length, data) \ | |
| 45 | do { \ | |
| 46 | unsigned __md_left = sizeof((ctx)->block) - (ctx)->index; \ | |
| 47 | if ((length) < __md_left) \ | |
| 48 | { \ | |
| 49 | memcpy((ctx)->block + (ctx)->index, (data), (length)); \ | |
| 50 | (ctx)->index += (length); \ | |
| 51 | return; \ | |
| 52 | } \ | |
| 53 | memcpy((ctx)->block + (ctx)->index, (data), __md_left); \ | |
| 54 | (data) += __md_left; \ | |
| 55 | (length) -= __md_left; \ | |
| 12bb2223 NM |
56 | } while(0) |
| 57 | ||
| bb9c0a1e NM |
58 | #define MD_FILL_OR_RETURN_INDEX(block_size, block, index, length, data) \ |
| 59 | do { \ | |
| 60 | unsigned __md_left = (block_size) - (index); \ | |
| 61 | if ((length) < __md_left) \ | |
| 62 | { \ | |
| 63 | memcpy(block + (index), (data), (length)); \ | |
| 64 | return (index) + (length); \ | |
| 65 | } \ | |
| 66 | memcpy((block) + (index), (data), __md_left); \ | |
| 67 | (data) += __md_left; \ | |
| 68 | (length) -= __md_left; \ | |
| 69 | } while(0) | |
| 12bb2223 | 70 | #endif /* NETTLE_MD_INTERNAL_H_INCLUDED */ |