/* $NetBSD: hmac.c,v 1.1.4.2 2024/02/29 11:39:00 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #include #include #include #include #include #include #include #include #include #include #include "openssl_shim.h" isc_hmac_t * isc_hmac_new(void) { HMAC_CTX *hmac = HMAC_CTX_new(); RUNTIME_CHECK(hmac != NULL); return ((struct hmac *)hmac); } void isc_hmac_free(isc_hmac_t *hmac) { if (ISC_UNLIKELY(hmac == NULL)) { return; } HMAC_CTX_free(hmac); } isc_result_t isc_hmac_init(isc_hmac_t *hmac, const void *key, size_t keylen, const isc_md_type_t *md_type) { REQUIRE(hmac != NULL); REQUIRE(key != NULL); if (md_type == NULL) { return (ISC_R_NOTIMPLEMENTED); } if (HMAC_Init_ex(hmac, key, keylen, md_type, NULL) != 1) { return (ISC_R_CRYPTOFAILURE); } return (ISC_R_SUCCESS); } isc_result_t isc_hmac_reset(isc_hmac_t *hmac) { REQUIRE(hmac != NULL); if (HMAC_CTX_reset(hmac) != 1) { return (ISC_R_CRYPTOFAILURE); } return (ISC_R_SUCCESS); } isc_result_t isc_hmac_update(isc_hmac_t *hmac, const unsigned char *buf, const size_t len) { REQUIRE(hmac != NULL); if (ISC_UNLIKELY(buf == NULL || len == 0)) { return (ISC_R_SUCCESS); } if (HMAC_Update(hmac, buf, len) != 1) { return (ISC_R_CRYPTOFAILURE); } return (ISC_R_SUCCESS); } isc_result_t isc_hmac_final(isc_hmac_t *hmac, unsigned char *digest, unsigned int *digestlen) { REQUIRE(hmac != NULL); REQUIRE(digest != NULL); if (HMAC_Final(hmac, digest, digestlen) != 1) { return (ISC_R_CRYPTOFAILURE); } return (ISC_R_SUCCESS); } const isc_md_type_t * isc_hmac_get_md_type(isc_hmac_t *hmac) { REQUIRE(hmac != NULL); return (HMAC_CTX_get_md(hmac)); } size_t isc_hmac_get_size(isc_hmac_t *hmac) { REQUIRE(hmac != NULL); return ((size_t)EVP_MD_size(HMAC_CTX_get_md(hmac))); } int isc_hmac_get_block_size(isc_hmac_t *hmac) { REQUIRE(hmac != NULL); return (EVP_MD_block_size(HMAC_CTX_get_md(hmac))); } isc_result_t isc_hmac(const isc_md_type_t *type, const void *key, const int keylen, const unsigned char *buf, const size_t len, unsigned char *digest, unsigned int *digestlen) { isc_result_t res; isc_hmac_t *hmac = isc_hmac_new(); res = isc_hmac_init(hmac, key, keylen, type); if (res != ISC_R_SUCCESS) { goto end; } res = isc_hmac_update(hmac, buf, len); if (res != ISC_R_SUCCESS) { goto end; } res = isc_hmac_final(hmac, digest, digestlen); if (res != ISC_R_SUCCESS) { goto end; } end: isc_hmac_free(hmac); return (res); }