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4e114f8ed6
The <isc/md.h> header directly included <openssl/evp.h> header which enforced all users of the libisc library to explicitly list the include path to OpenSSL and link with -lcrypto. By hiding the specific implementation into the private namespace, we no longer enforce this. In the long run, this might also allow us to switch cryptographic library implementation without affecting the downstream users. While making the isc_md_type_t type opaque, the API using the data type was changed to use the pointer to isc_md_type_t instead of using the type directly.
173 lines
3.4 KiB
C
173 lines
3.4 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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#include <stdio.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/opensslv.h>
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#include <isc/md.h>
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#include <isc/util.h>
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#include "openssl_shim.h"
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isc_md_t *
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isc_md_new(void) {
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isc_md_t *md = EVP_MD_CTX_new();
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RUNTIME_CHECK(md != NULL);
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return (md);
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}
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void
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isc_md_free(isc_md_t *md) {
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if (ISC_UNLIKELY(md == NULL)) {
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return;
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}
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EVP_MD_CTX_free(md);
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}
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isc_result_t
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isc_md_init(isc_md_t *md, const isc_md_type_t *md_type) {
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REQUIRE(md != NULL);
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if (md_type == NULL) {
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return (ISC_R_NOTIMPLEMENTED);
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}
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if (EVP_DigestInit_ex(md, md_type, NULL) != 1) {
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return (ISC_R_CRYPTOFAILURE);
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}
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return (ISC_R_SUCCESS);
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}
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isc_result_t
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isc_md_reset(isc_md_t *md) {
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REQUIRE(md != NULL);
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if (EVP_MD_CTX_reset(md) != 1) {
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return (ISC_R_CRYPTOFAILURE);
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}
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return (ISC_R_SUCCESS);
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}
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isc_result_t
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isc_md_update(isc_md_t *md, const unsigned char *buf, const size_t len) {
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REQUIRE(md != NULL);
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if (ISC_UNLIKELY(buf == NULL || len == 0)) {
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return (ISC_R_SUCCESS);
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}
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if (EVP_DigestUpdate(md, buf, len) != 1) {
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return (ISC_R_CRYPTOFAILURE);
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}
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return (ISC_R_SUCCESS);
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}
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isc_result_t
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isc_md_final(isc_md_t *md, unsigned char *digest, unsigned int *digestlen) {
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REQUIRE(md != NULL);
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REQUIRE(digest != NULL);
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if (EVP_DigestFinal_ex(md, digest, digestlen) != 1) {
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return (ISC_R_CRYPTOFAILURE);
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}
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return (ISC_R_SUCCESS);
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}
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const isc_md_type_t *
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isc_md_get_md_type(isc_md_t *md) {
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REQUIRE(md != NULL);
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return (EVP_MD_CTX_md(md));
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}
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size_t
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isc_md_get_size(isc_md_t *md) {
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REQUIRE(md != NULL);
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return (EVP_MD_CTX_size(md));
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}
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size_t
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isc_md_get_block_size(isc_md_t *md) {
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REQUIRE(md != NULL);
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return (EVP_MD_CTX_block_size(md));
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}
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size_t
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isc_md_type_get_size(const isc_md_type_t *md_type) {
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STATIC_ASSERT(ISC_MAX_MD_SIZE >= EVP_MAX_MD_SIZE,
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"Change ISC_MAX_MD_SIZE to be greater than or equal to "
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"EVP_MAX_MD_SIZE");
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if (md_type != NULL) {
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return ((size_t)EVP_MD_size(md_type));
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}
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return (ISC_MAX_MD_SIZE);
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}
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size_t
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isc_md_type_get_block_size(const isc_md_type_t *md_type) {
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STATIC_ASSERT(ISC_MAX_MD_SIZE >= EVP_MAX_MD_SIZE,
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"Change ISC_MAX_MD_SIZE to be greater than or equal to "
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"EVP_MAX_MD_SIZE");
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if (md_type != NULL) {
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return ((size_t)EVP_MD_block_size(md_type));
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}
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return (ISC_MAX_MD_SIZE);
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}
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isc_result_t
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isc_md(const isc_md_type_t *md_type, const unsigned char *buf, const size_t len,
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unsigned char *digest, unsigned int *digestlen) {
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isc_md_t *md;
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isc_result_t res;
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md = isc_md_new();
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res = isc_md_init(md, md_type);
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if (res != ISC_R_SUCCESS) {
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goto end;
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}
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res = isc_md_update(md, buf, len);
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if (res != ISC_R_SUCCESS) {
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goto end;
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}
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res = isc_md_final(md, digest, digestlen);
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if (res != ISC_R_SUCCESS) {
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goto end;
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}
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end:
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isc_md_free(md);
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return (res);
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}
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#define md_register_algorithm(alg) \
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const isc_md_type_t *isc__md_##alg(void) { return (EVP_##alg()); }
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md_register_algorithm(md5);
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md_register_algorithm(sha1);
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md_register_algorithm(sha224);
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md_register_algorithm(sha256);
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md_register_algorithm(sha384);
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md_register_algorithm(sha512);
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