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/*
* 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 <openssl/hmac.h>
#include <openssl/opensslv.h>
#include <isc/assertions.h>
#include <isc/hmac.h>
#include <isc/md.h>
#include <isc/platform.h>
#include <isc/safe.h>
#include <isc/string.h>
#include <isc/types.h>
#include <isc/util.h>
#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);
}
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