md5_int.h (4443B)
1 /* SPDX-License-Identifier: LGPL-2.1-or-later OR (GPL-2.0-or-later WITH eCos-exception-2.0) */ 2 /* 3 This file is part of GNU libmicrohttpd. 4 Copyright (C) 2022-2024 Evgeny Grin (Karlson2k) 5 6 GNU libmicrohttpd is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public 8 License as published by the Free Software Foundation; either 9 version 2.1 of the License, or (at your option) any later version. 10 11 GNU libmicrohttpd is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 Alternatively, you can redistribute GNU libmicrohttpd and/or 17 modify it under the terms of the GNU General Public License as 18 published by the Free Software Foundation; either version 2 of 19 the License, or (at your option) any later version, together 20 with the eCos exception, as follows: 21 22 As a special exception, if other files instantiate templates or 23 use macros or inline functions from this file, or you compile this 24 file and link it with other works to produce a work based on this 25 file, this file does not by itself cause the resulting work to be 26 covered by the GNU General Public License. However the source code 27 for this file must still be made available in accordance with 28 section (3) of the GNU General Public License v2. 29 30 This exception does not invalidate any other reasons why a work 31 based on this file might be covered by the GNU General Public 32 License. 33 34 You should have received copies of the GNU Lesser General Public 35 License and the GNU General Public License along with this library; 36 if not, see <https://www.gnu.org/licenses/>. 37 */ 38 39 /** 40 * @file src/mhd2/md5_int.h 41 * @brief Calculation of MD5 digest 42 * @author Karlson2k (Evgeny Grin) 43 */ 44 45 #ifndef MHD_MD5_INT_H 46 #define MHD_MD5_INT_H 1 47 48 #include "mhd_sys_options.h" 49 50 #include "sys_base_types.h" 51 52 /** 53 * Number of bits in single MD5 word. 54 */ 55 #define mhd_MD5_WORD_SIZE_BITS (32) 56 57 /** 58 * Number of bytes in single MD5 word. 59 */ 60 #define mhd_MD5_BYTES_IN_WORD (mhd_MD5_WORD_SIZE_BITS / 8) 61 62 /** 63 * Hash is kept internally as four 32-bit words. 64 * This is intermediate hash size, used during computing the final digest. 65 */ 66 #define mhd_MD5_HASH_SIZE_WORDS (4) 67 68 /** 69 * Size of MD5 resulting digest in bytes. 70 * This is the final digest size, not intermediate hash. 71 */ 72 #define mhd_MD5_DIGEST_SIZE_WORDS mhd_MD5_HASH_SIZE_WORDS 73 74 /** 75 * Size of MD5 resulting digest in bytes 76 * This is the final digest size, not intermediate hash. 77 */ 78 #define mhd_MD5_DIGEST_SIZE (mhd_MD5_DIGEST_SIZE_WORDS * mhd_MD5_BYTES_IN_WORD) 79 80 /** 81 * Size of MD5 single processing block in bits. 82 */ 83 #define mhd_MD5_BLOCK_SIZE_BITS 512 84 85 /** 86 * Size of MD5 single processing block in bytes. 87 */ 88 #define mhd_MD5_BLOCK_SIZE (mhd_MD5_BLOCK_SIZE_BITS / 8) 89 90 /** 91 * Size of MD5 single processing block in words. 92 */ 93 #define mhd_MD5_BLOCK_SIZE_WORDS \ 94 (mhd_MD5_BLOCK_SIZE_BITS / mhd_MD5_WORD_SIZE_BITS) 95 96 97 /** 98 * MD5 calculation context 99 */ 100 struct mhd_Md5CtxInt 101 { 102 uint32_t H[mhd_MD5_HASH_SIZE_WORDS]; /**< Intermediate hash value / digest at end of calculation */ 103 uint32_t buffer[mhd_MD5_BLOCK_SIZE_WORDS]; /**< MD5 input data buffer */ 104 uint64_t count; /**< number of bytes, mod 2^64 */ 105 }; 106 107 /** 108 * Initialise structure for MD5 calculation. 109 * 110 * @param ctx the calculation context 111 */ 112 MHD_INTERNAL void 113 mhd_MD5_init (struct mhd_Md5CtxInt *ctx) 114 MHD_FN_PAR_NONNULL_ALL_; 115 116 117 /** 118 * MD5 process portion of bytes. 119 * 120 * @param ctx the calculation context 121 * @param size number of bytes in @a data 122 * @param data bytes to add to hash 123 */ 124 MHD_INTERNAL void 125 mhd_MD5_update (struct mhd_Md5CtxInt *restrict ctx, 126 size_t size, 127 const uint8_t *restrict data) 128 MHD_FN_PAR_NONNULL_ALL_ MHD_FN_PAR_IN_SIZE_ (3, 2); 129 130 131 /** 132 * Finalise MD5 calculation, return digest. 133 * 134 * @param ctx the calculation context 135 * @param[out] digest set to the hash, must be #mhd_MD5_DIGEST_SIZE bytes 136 */ 137 MHD_INTERNAL void 138 mhd_MD5_finish (struct mhd_Md5CtxInt *restrict ctx, 139 uint8_t digest[mhd_MD5_DIGEST_SIZE]) 140 MHD_FN_PAR_NONNULL_ALL_ MHD_FN_PAR_OUT_ (2); 141 142 /** 143 * Indicates that function mhd_MD5_finish() (without context reset) is available 144 */ 145 #define mhd_MD5_HAS_FINISH 1 146 147 #endif /* MHD_MD5_INT_H */