mirror of https://github.com/ipxe/ipxe.git
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/*
|
|
* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of the
|
|
* License, or any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301, USA.
|
|
*/
|
|
|
|
FILE_LICENCE ( GPL2_OR_LATER );
|
|
|
|
/** @file
|
|
*
|
|
* Entropy sampling
|
|
*
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <ipxe/entropy.h>
|
|
#include <ipxe/test.h>
|
|
|
|
/** Total number of test samples */
|
|
#define SAMPLE_COUNT 65536
|
|
|
|
/** Number of samples per block */
|
|
#define SAMPLE_BLOCKSIZE 256
|
|
|
|
/**
|
|
* Generate entropy samples for external testing
|
|
*
|
|
*/
|
|
static void entropy_sample_test_exec ( void ) {
|
|
static noise_sample_t samples[SAMPLE_BLOCKSIZE];
|
|
unsigned int i;
|
|
unsigned int j;
|
|
int rc;
|
|
|
|
/* Collect and print blocks of samples */
|
|
for ( i = 0 ; i < ( SAMPLE_COUNT / SAMPLE_BLOCKSIZE ) ; i++ ) {
|
|
|
|
/* Collect one block of samples */
|
|
rc = entropy_enable();
|
|
ok ( rc == 0 );
|
|
for ( j = 0 ; j < SAMPLE_BLOCKSIZE ; j++ ) {
|
|
rc = get_noise ( &samples[j] );
|
|
ok ( rc == 0 );
|
|
}
|
|
entropy_disable();
|
|
|
|
/* Print out sample values */
|
|
for ( j = 0 ; j < SAMPLE_BLOCKSIZE ; j++ ) {
|
|
printf ( "SAMPLE %d %d\n", ( i * SAMPLE_BLOCKSIZE + j ),
|
|
samples[j] );
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Entropy sampling self-test */
|
|
struct self_test entropy_sample_test __self_test = {
|
|
.name = "entropy_sample",
|
|
.exec = entropy_sample_test_exec,
|
|
};
|