sha256_gnutls.c (3892B)
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) 2022-2026 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/sha256_gnutls.c 41 * @brief Wrapper for SHA-256 calculation performed by GnuTLS backend 42 * @author Karlson2k (Evgeny Grin) 43 */ 44 45 #include "mhd_sys_options.h" 46 47 #include <gnutls/crypto.h> 48 #include "mhd_assert.h" 49 50 #include "sha256_gnutls.h" 51 52 53 MHD_INTERNAL MHD_FN_PAR_NONNULL_ALL_ MHD_FN_PAR_OUT_ (1) void 54 mhd_SHA256_gtls_init (struct mhd_Sha256CtxGtls *ctx) 55 { 56 ctx->handle = NULL; 57 ctx->ext_error = gnutls_hash_init (&ctx->handle, 58 GNUTLS_DIG_SHA256); 59 if ((0 != ctx->ext_error) && (NULL != ctx->handle)) 60 { 61 /* GnuTLS may return an initialisation error and set the handle at the 62 same time. Such a handle cannot be used for calculations. 63 Note: GnuTLS may also return an error and NOT set the handle. */ 64 mhd_SHA256_gtls_deinit (ctx); 65 } 66 67 /* If handle is NULL, the error must be set */ 68 mhd_assert ((NULL != ctx->handle) || (0 != ctx->ext_error)); 69 /* If error is set, the handle must be NULL */ 70 mhd_assert ((0 == ctx->ext_error) || (NULL == ctx->handle)); 71 } 72 73 74 MHD_INTERNAL MHD_FN_PAR_NONNULL_ALL_ MHD_FN_PAR_INOUT_ (1) 75 MHD_FN_PAR_IN_SIZE_ (3, 2) void 76 mhd_SHA256_gtls_update (struct mhd_Sha256CtxGtls *restrict ctx, 77 size_t size, 78 const void *restrict data) 79 { 80 #ifndef MHD_UNIT_TESTING 81 mhd_assert (0 != size); 82 #endif 83 84 if (0 == ctx->ext_error) 85 ctx->ext_error = gnutls_hash (ctx->handle, 86 data, 87 size); 88 } 89 90 91 MHD_INTERNAL MHD_FN_PAR_NONNULL_ALL_ MHD_FN_PAR_INOUT_ (1) 92 MHD_FN_PAR_OUT_ (2) void 93 mhd_SHA256_gtls_finish ( 94 struct mhd_Sha256CtxGtls *restrict ctx, 95 uint8_t digest[MHD_FN_PAR_FIX_ARR_SIZE_ (mhd_SHA256_DIGEST_SIZE)]) 96 { 97 if (0 == ctx->ext_error) 98 gnutls_hash_output (ctx->handle, 99 digest); 100 } 101 102 103 MHD_INTERNAL MHD_FN_PAR_NONNULL_ALL_ 104 MHD_FN_PAR_INOUT_ (1) void 105 mhd_SHA256_gtls_deinit (struct mhd_Sha256CtxGtls *ctx) 106 { 107 if (NULL != ctx->handle) 108 { 109 gnutls_hash_deinit (ctx->handle, 110 NULL); 111 ctx->handle = NULL; 112 } 113 }