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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/err.h>
#include <openssl/evp.h>
#include <openssl/opensslv.h>
#include <isc/assertions.h>
#include <isc/hmac.h>
#include <isc/md.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) {
EVP_MD_CTX *hmac = EVP_MD_CTX_new();
RUNTIME_CHECK(hmac != NULL);
return ((isc_hmac_t *)hmac);
}
void
isc_hmac_free(isc_hmac_t *hmac) {
if (hmac == NULL) {
return;
}
EVP_MD_CTX_free((EVP_MD_CTX *)hmac);
}
isc_result_t
isc_hmac_init(isc_hmac_t *hmac, const void *key, const size_t keylen,
const isc_md_type_t *md_type) {
EVP_PKEY *pkey;
REQUIRE(hmac != NULL);
REQUIRE(key != NULL);
REQUIRE(keylen <= INT_MAX);
if (md_type == NULL) {
return (ISC_R_NOTIMPLEMENTED);
}
pkey = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL, key, keylen);
if (pkey == NULL) {
ERR_clear_error();
return (ISC_R_CRYPTOFAILURE);
}
if (EVP_DigestSignInit(hmac, NULL, md_type, NULL, pkey) != 1) {
EVP_PKEY_free(pkey);
ERR_clear_error();
return (ISC_R_CRYPTOFAILURE);
}
EVP_PKEY_free(pkey);
return (ISC_R_SUCCESS);
}
isc_result_t
isc_hmac_reset(isc_hmac_t *hmac) {
REQUIRE(hmac != NULL);
if (EVP_MD_CTX_reset(hmac) != 1) {
ERR_clear_error();
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 (buf == NULL || len == 0) {
return (ISC_R_SUCCESS);
}
if (EVP_DigestSignUpdate(hmac, buf, len) != 1) {
ERR_clear_error();
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);
REQUIRE(digestlen != NULL);
size_t len = *digestlen;
if (EVP_DigestSignFinal(hmac, digest, &len) != 1) {
ERR_clear_error();
return (ISC_R_CRYPTOFAILURE);
}
*digestlen = (unsigned int)len;
return (ISC_R_SUCCESS);
}
const isc_md_type_t *
isc_hmac_get_md_type(isc_hmac_t *hmac) {
REQUIRE(hmac != NULL);
return (EVP_MD_CTX_get0_md(hmac));
}
size_t
isc_hmac_get_size(isc_hmac_t *hmac) {
REQUIRE(hmac != NULL);
return ((size_t)EVP_MD_CTX_size(hmac));
}
int
isc_hmac_get_block_size(isc_hmac_t *hmac) {
REQUIRE(hmac != NULL);
return (EVP_MD_CTX_block_size(hmac));
}
isc_result_t
isc_hmac(const isc_md_type_t *type, const void *key, const size_t 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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