acrn-hypervisor/devicemodel/core/vrpmb.c

82 lines
2.2 KiB
C

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