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/*
* Copyright (c) 2015, NORDUnet A/S All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - 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.
*
* - Neither the name of the NORDUnet nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT
* HOLDER 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.
*/
/*
* NOTE: This just exercises the interface to the TRNG cores, and displays
* a few words of random data. It does not attempt to analyse the quality
* of the data; for that, use something like dieharder.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <sys/time.h>
#include <hal.h>
#include <hal_internal.h>
#include <verilog_constants.h>
#ifndef WAIT_FOR_CSPRNG_VALID
#define WAIT_FOR_CSPRNG_VALID 1
#endif
static void show_core(const hal_core_t *core, const char *whinge)
{
const hal_core_info_t *core_info = hal_core_info(core);
if (core_info != NULL)
printf("\"%8.8s\" \"%4.4s\"\n", core_info->name, core_info->version);
else if (whinge != NULL)
printf("%s core not present\n", whinge);
}
static hal_error_t test_random(const char *name)
{
const hal_core_t *core;
hal_error_t err;
uint32_t rnd;
int i;
core = hal_core_find(name, NULL);
show_core(core, name);
if (core == NULL)
return HAL_ERROR_CORE_NOT_FOUND;
for (i = 0; i < 8; ++i) {
if (WAIT_FOR_CSPRNG_VALID && (err = hal_io_wait_valid(core)) != HAL_OK) {
printf("hal_io_wait_valid: %s\n", hal_error_string(err));
return err;
}
/* We use symbol CSPRNG_ADDR_RANDOM here, but the entropy sources
* present their data on the same register number.
*/
if ((err = hal_io_read(core, CSPRNG_ADDR_RANDOM, (uint8_t *) &rnd, sizeof(rnd))) != HAL_OK) {
printf("hal_io_read: %s\n", hal_error_string(err));
return err;
}
printf("%08lx ", (unsigned long) rnd);
}
printf("\n");
return HAL_OK;
}
int main(void)
{
hal_error_t err;
uint32_t rnd[8];
int i;
/* Exercise the API function. This gets random data from the CSPRNG,
* so we end up hitting that twice.
*/
printf("hal_get_random\n");
if ((err = hal_get_random(NULL, (void *) &rnd, sizeof(rnd))) != HAL_OK) {
printf("hal_get_random: %s\n", hal_error_string(err));
}
else {
for (i = 0; i < 8; ++i) {
printf("%08lx ", (unsigned long) rnd[i]);
}
printf("\n");
}
return
test_random(AVALANCHE_ENTROPY_NAME) ||
test_random(ROSC_ENTROPY_NAME) ||
test_random(CSPRNG_NAME);
}
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