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Diffstat (limited to '')
| -rw-r--r-- | lib/isc/md.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/lib/isc/md.c b/lib/isc/md.c new file mode 100644 index 0000000..a8c6312 --- /dev/null +++ b/lib/isc/md.c @@ -0,0 +1,185 @@ +/* + * 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 <stdio.h> + +#include <openssl/err.h> +#include <openssl/evp.h> +#include <openssl/opensslv.h> + +#include <isc/md.h> +#include <isc/util.h> + +#include "openssl_shim.h" + +isc_md_t * +isc_md_new(void) { + isc_md_t *md = EVP_MD_CTX_new(); + RUNTIME_CHECK(md != NULL); + return (md); +} + +void +isc_md_free(isc_md_t *md) { + if (md == NULL) { + return; + } + + EVP_MD_CTX_free(md); +} + +isc_result_t +isc_md_init(isc_md_t *md, const isc_md_type_t *md_type) { + REQUIRE(md != NULL); + + if (md_type == NULL) { + return (ISC_R_NOTIMPLEMENTED); + } + + if (EVP_DigestInit_ex(md, md_type, NULL) != 1) { + ERR_clear_error(); + return (ISC_R_CRYPTOFAILURE); + } + + return (ISC_R_SUCCESS); +} + +isc_result_t +isc_md_reset(isc_md_t *md) { + REQUIRE(md != NULL); + + if (EVP_MD_CTX_reset(md) != 1) { + ERR_clear_error(); + return (ISC_R_CRYPTOFAILURE); + } + + return (ISC_R_SUCCESS); +} + +isc_result_t +isc_md_update(isc_md_t *md, const unsigned char *buf, const size_t len) { + REQUIRE(md != NULL); + + if (buf == NULL || len == 0) { + return (ISC_R_SUCCESS); + } + + if (EVP_DigestUpdate(md, buf, len) != 1) { + ERR_clear_error(); + return (ISC_R_CRYPTOFAILURE); + } + + return (ISC_R_SUCCESS); +} + +isc_result_t +isc_md_final(isc_md_t *md, unsigned char *digest, unsigned int *digestlen) { + REQUIRE(md != NULL); + REQUIRE(digest != NULL); + + if (EVP_DigestFinal_ex(md, digest, digestlen) != 1) { + ERR_clear_error(); + return (ISC_R_CRYPTOFAILURE); + } + + return (ISC_R_SUCCESS); +} + +const isc_md_type_t * +isc_md_get_md_type(isc_md_t *md) { + REQUIRE(md != NULL); + + return (EVP_MD_CTX_get0_md(md)); +} + +size_t +isc_md_get_size(isc_md_t *md) { + REQUIRE(md != NULL); + + return (EVP_MD_CTX_size(md)); +} + +size_t +isc_md_get_block_size(isc_md_t *md) { + REQUIRE(md != NULL); + + return (EVP_MD_CTX_block_size(md)); +} + +size_t +isc_md_type_get_size(const isc_md_type_t *md_type) { + STATIC_ASSERT(ISC_MAX_MD_SIZE >= EVP_MAX_MD_SIZE, + "Change ISC_MAX_MD_SIZE to be greater than or equal to " + "EVP_MAX_MD_SIZE"); + if (md_type != NULL) { + return ((size_t)EVP_MD_size(md_type)); + } + + return (ISC_MAX_MD_SIZE); +} + +size_t +isc_md_type_get_block_size(const isc_md_type_t *md_type) { + STATIC_ASSERT(ISC_MAX_MD_SIZE >= EVP_MAX_MD_SIZE, + "Change ISC_MAX_MD_SIZE to be greater than or equal to " + "EVP_MAX_MD_SIZE"); + if (md_type != NULL) { + return ((size_t)EVP_MD_block_size(md_type)); + } + + return (ISC_MAX_MD_SIZE); +} + +isc_result_t +isc_md(const isc_md_type_t *md_type, const unsigned char *buf, const size_t len, + unsigned char *digest, unsigned int *digestlen) { + isc_md_t *md; + isc_result_t res; + + md = isc_md_new(); + + res = isc_md_init(md, md_type); + if (res != ISC_R_SUCCESS) { + goto end; + } + + res = isc_md_update(md, buf, len); + if (res != ISC_R_SUCCESS) { + goto end; + } + + res = isc_md_final(md, digest, digestlen); + if (res != ISC_R_SUCCESS) { + goto end; + } +end: + isc_md_free(md); + + return (res); +} + +#define md_register_algorithm(alg) \ + const isc_md_type_t *isc__md_##alg(void) { \ + const isc_md_type_t *value = EVP_##alg(); \ + if (value == NULL) { \ + ERR_clear_error(); \ + } \ + return (value); \ + } + +md_register_algorithm(md5); +md_register_algorithm(sha1); +md_register_algorithm(sha224); +md_register_algorithm(sha256); +md_register_algorithm(sha384); +md_register_algorithm(sha512); |