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https://github.com/ipxe/ipxe
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7d71cf318a
Provide per-source state variables for the repetition count test and adaptive proportion test, to allow for the situation in which an entropy source can be enabled but then fails during the startup tests, thereby requiring an alternative entropy source to be used. Signed-off-by: Michael Brown <mcb30@ipxe.org>
91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/*
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* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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/** @file
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*
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* Entropy sampling
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*
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*/
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#include <stdio.h>
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#include <ipxe/entropy.h>
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#include <ipxe/test.h>
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/** Total number of test samples */
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#define SAMPLE_COUNT 65536
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/** Number of samples per block */
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#define SAMPLE_BLOCKSIZE 256
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/**
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* Generate entropy samples for external testing
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*
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* @v source Entropy source
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*/
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static void entropy_sample ( struct entropy_source *source ) {
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static noise_sample_t samples[SAMPLE_BLOCKSIZE];
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unsigned int i;
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unsigned int j;
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int rc;
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/* Collect and print blocks of samples */
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for ( i = 0 ; i < ( SAMPLE_COUNT / SAMPLE_BLOCKSIZE ) ; i++ ) {
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/* Collect one block of samples */
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rc = entropy_enable ( source );
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ok ( rc == 0 );
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for ( j = 0 ; j < SAMPLE_BLOCKSIZE ; j++ ) {
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rc = get_noise ( source, &samples[j] );
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ok ( rc == 0 );
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}
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entropy_disable ( source );
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/* Print out sample values */
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for ( j = 0 ; j < SAMPLE_BLOCKSIZE ; j++ ) {
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printf ( "SAMPLE %s %d %d\n", source->name,
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( i * SAMPLE_BLOCKSIZE + j ), samples[j] );
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}
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}
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}
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/**
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* Generate entropy samples for external testing
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*
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*/
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static void entropy_sample_test_exec ( void ) {
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struct entropy_source *source;
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/* Test each entropy source */
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for_each_table_entry ( source, ENTROPY_SOURCES ) {
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entropy_sample ( source );
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}
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}
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/** Entropy sampling self-test */
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struct self_test entropy_sample_test __self_test = {
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.name = "entropy_sample",
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.exec = entropy_sample_test_exec,
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};
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