mirror of https://github.com/ARMmbed/mbed-os.git
92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/*
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* Copyright (c) 2016-2020, Pelion and affiliates.
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "nsconfig.h"
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#include <string.h>
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#include "ns_types.h"
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#include "ns_list.h"
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#include "ns_trace.h"
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#include "mbedtls/md.h"
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#include "hmac_md.h"
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#define TRACE_GROUP "hmac"
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int8_t hmac_md_calc(const alg_hmac_md_e md, const uint8_t *key, uint16_t key_len, const uint8_t *data, uint16_t data_len, uint8_t *result, uint8_t result_len)
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{
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#ifdef EXTRA_DEBUG_INFO
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// Extensive debug for now, to be disabled later
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tr_debug("hmac_md key %s", trace_array(key, key_len));
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const uint8_t *print_data = data;
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uint16_t print_data_len = data_len;
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while (true) {
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tr_debug("hmac_md data %s", trace_array(print_data, print_data_len > 32 ? 32 : print_data_len));
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if (print_data_len > 32) {
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print_data_len -= 32;
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print_data += 32;
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} else {
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break;
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}
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}
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#endif
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mbedtls_md_type_t md_type;
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if (md == ALG_HMAC_MD5) {
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md_type = MBEDTLS_MD_MD5;
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} else {
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md_type = MBEDTLS_MD_SHA1;
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}
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const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(md_type);
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if (md_info == NULL) {
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return -1;
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}
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mbedtls_md_context_t ctx;
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mbedtls_md_init(&ctx);
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if (mbedtls_md_setup(&ctx, md_info, 1) != 0) {
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return -1;
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}
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if (mbedtls_md_hmac_starts(&ctx, (const unsigned char *) key, key_len) != 0) {
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goto error;
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}
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if (mbedtls_md_hmac_update(&ctx, (const unsigned char *) data, data_len) != 0) {
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goto error;
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}
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uint8_t result_value[20];
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if (mbedtls_md_hmac_finish(&ctx, result_value) != 0) {
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goto error;
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}
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mbedtls_md_free(&ctx);
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if (result_len > 20) {
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result_len = 20;
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}
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memcpy(result, result_value, result_len);
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#ifdef EXTRA_DEBUG_INFO
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tr_debug("hmac_md result %s", trace_array(result_value, 20));
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#endif
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return 0;
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error:
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mbedtls_md_free(&ctx);
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return -1;
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}
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