| /* |
| This file is part of libmicrohttpd |
| Copyright (C) 2019-2022 Evgeny Grin (Karlson2k) |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library. |
| If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| /** |
| * @file microhttpd/sha256.h |
| * @brief Calculation of SHA-256 digest |
| * @author Karlson2k (Evgeny Grin) |
| */ |
| |
| #ifndef MHD_SHA256_H |
| #define MHD_SHA256_H 1 |
| |
| #include "mhd_options.h" |
| #include <stdint.h> |
| #ifdef HAVE_STDDEF_H |
| #include <stddef.h> /* for size_t */ |
| #endif /* HAVE_STDDEF_H */ |
| |
| |
| /** |
| * Digest is kept internally as 8 32-bit words. |
| */ |
| #define SHA256_DIGEST_SIZE_WORDS 8 |
| |
| /** |
| * Number of bits in single SHA-256 word |
| */ |
| #define SHA256_WORD_SIZE_BITS 32 |
| |
| /** |
| * Number of bytes in single SHA-256 word |
| * used to process data |
| */ |
| #define SHA256_BYTES_IN_WORD (SHA256_WORD_SIZE_BITS / 8) |
| |
| /** |
| * Size of SHA-256 digest in bytes |
| */ |
| #define SHA256_DIGEST_SIZE (SHA256_DIGEST_SIZE_WORDS * SHA256_BYTES_IN_WORD) |
| |
| /** |
| * Size of SHA-256 digest string in chars including termination NUL |
| */ |
| #define SHA256_DIGEST_STRING_SIZE ((SHA256_DIGEST_SIZE) * 2 + 1) |
| |
| /** |
| * Size of single processing block in bits |
| */ |
| #define SHA256_BLOCK_SIZE_BITS 512 |
| |
| /** |
| * Size of single processing block in bytes |
| */ |
| #define SHA256_BLOCK_SIZE (SHA256_BLOCK_SIZE_BITS / 8) |
| |
| /** |
| * Size of single processing block in bytes |
| */ |
| #define SHA256_BLOCK_SIZE_WORDS (SHA256_BLOCK_SIZE_BITS / SHA256_WORD_SIZE_BITS) |
| |
| |
| struct Sha256Ctx |
| { |
| uint32_t H[SHA256_DIGEST_SIZE_WORDS]; /**< Intermediate hash value / digest at end of calculation */ |
| uint32_t buffer[SHA256_BLOCK_SIZE_WORDS]; /**< SHA256 input data buffer */ |
| uint64_t count; /**< number of bytes, mod 2^64 */ |
| }; |
| |
| /** |
| * Initialise structure for SHA256 calculation. |
| * |
| * @param ctx must be a `struct Sha256Ctx *` |
| */ |
| void |
| MHD_SHA256_init (struct Sha256Ctx *ctx); |
| |
| |
| /** |
| * Process portion of bytes. |
| * |
| * @param ctx must be a `struct Sha256Ctx *` |
| * @param data bytes to add to hash |
| * @param length number of bytes in @a data |
| */ |
| void |
| MHD_SHA256_update (struct Sha256Ctx *ctx, |
| const uint8_t *data, |
| size_t length); |
| |
| |
| /** |
| * Finalise SHA256 calculation, return digest. |
| * |
| * @param ctx must be a `struct Sha256Ctx *` |
| * @param[out] digest set to the hash, must be #SHA256_DIGEST_SIZE bytes |
| */ |
| void |
| MHD_SHA256_finish (struct Sha256Ctx *ctx, |
| uint8_t digest[SHA256_DIGEST_SIZE]); |
| |
| /** |
| * Indicates that function MHD_SHA256_finish() (without context reset) is available |
| */ |
| #define MHD_SHA256_HAS_FINISH 1 |
| |
| #endif /* MHD_SHA256_H */ |