79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/*
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* Copyright (c) 2018 Intel Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <openssl/rand.h>
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#include "types.h"
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#include "vrpmb.h"
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#define DRNG_MAX_RETRIES 5U
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struct key_material {
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uint8_t key[RPMB_KEY_LEN];
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bool initialized;
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};
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static struct key_material vrkey = {
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.key = {0},
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.initialized = false
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};
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int get_vrpmb_key(uint8_t *out, size_t size)
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{
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int ret;
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int i;
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if (!out) {
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fprintf(stderr, "%s: Invalid output pointer\n", __func__);
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return 0;
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}
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assert(size == RPMB_KEY_LEN);
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if ( vrkey.initialized == false ) {
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for (i = 0; i < DRNG_MAX_RETRIES; i++) {
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ret = RAND_bytes(vrkey.key, RPMB_KEY_LEN);
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if (ret == 1) {
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vrkey.initialized = true;
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break;
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}
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}
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if (vrkey.initialized != true) {
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fprintf(stderr, "%s: unable to generate random key!\n", __func__);
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return 0;
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}
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}
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memcpy(out, vrkey.key, size);
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return 1;
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}
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