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[rng] Add entropy sample generator

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Allow a list of raw noise samples to be generated for offline
analysis.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2012-02-27 23:43:30 +00:00
parent c0340d9762
commit 5d2e65c60f
1 changed files with 70 additions and 0 deletions
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src/tests/entropy_sample.c Normal file
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/*
* 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., 675 Mass Ave, Cambridge, MA 02139, 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 */
entropy_enable();
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,
};