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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
144 lines
2.8 KiB
C
144 lines
2.8 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 <openssl/hmac.h>
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#include <openssl/opensslv.h>
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#include <isc/assertions.h>
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#include <isc/hmac.h>
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#include <isc/md.h>
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#include <isc/safe.h>
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#include <isc/string.h>
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#include <isc/types.h>
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#include <isc/util.h>
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#include "openssl_shim.h"
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isc_hmac_t *
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isc_hmac_new(void) {
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HMAC_CTX *hmac = HMAC_CTX_new();
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RUNTIME_CHECK(hmac != NULL);
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return ((struct hmac *)hmac);
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}
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void
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isc_hmac_free(isc_hmac_t *hmac) {
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if (hmac == NULL) {
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return;
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}
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HMAC_CTX_free(hmac);
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}
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isc_result_t
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isc_hmac_init(isc_hmac_t *hmac, const void *key, size_t keylen,
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const isc_md_type_t *md_type) {
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REQUIRE(hmac != NULL);
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REQUIRE(key != 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 (HMAC_Init_ex(hmac, key, keylen, 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_hmac_reset(isc_hmac_t *hmac) {
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REQUIRE(hmac != NULL);
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if (HMAC_CTX_reset(hmac) != 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_hmac_update(isc_hmac_t *hmac, const unsigned char *buf, const size_t len) {
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REQUIRE(hmac != 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 (HMAC_Update(hmac, 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_hmac_final(isc_hmac_t *hmac, unsigned char *digest,
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unsigned int *digestlen) {
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REQUIRE(hmac != NULL);
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REQUIRE(digest != NULL);
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if (HMAC_Final(hmac, 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_hmac_get_md_type(isc_hmac_t *hmac) {
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REQUIRE(hmac != NULL);
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return (HMAC_CTX_get_md(hmac));
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}
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size_t
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isc_hmac_get_size(isc_hmac_t *hmac) {
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REQUIRE(hmac != NULL);
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return ((size_t)EVP_MD_size(HMAC_CTX_get_md(hmac)));
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}
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int
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isc_hmac_get_block_size(isc_hmac_t *hmac) {
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REQUIRE(hmac != NULL);
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return (EVP_MD_block_size(HMAC_CTX_get_md(hmac)));
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}
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isc_result_t
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isc_hmac(const isc_md_type_t *type, const void *key, const int keylen,
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const unsigned char *buf, const size_t len, unsigned char *digest,
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unsigned int *digestlen) {
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isc_result_t res;
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isc_hmac_t *hmac = isc_hmac_new();
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res = isc_hmac_init(hmac, key, keylen, 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_hmac_update(hmac, 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_hmac_final(hmac, 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_hmac_free(hmac);
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return (res);
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}
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