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https://gitlab.isc.org/isc-projects/bind9
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e603983ec9
The __builtin_expect() can be used to provide the compiler with branch
prediction information. The Gcc manual says[1] on the subject:
In general, you should prefer to use actual profile feedback for
this (-fprofile-arcs), as programmers are notoriously bad at
predicting how their programs actually perform.
Stop using __builtin_expect() and ISC_LIKELY() and ISC_UNLIKELY() macros
to provide the branch prediction information as the performance testing
shows that named performs better when the __builtin_expect() is not
being used.
1. https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#index-_005f_005fbuiltin_005fexpect
174 lines
3.4 KiB
C
174 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 https://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 (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 (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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