entropy_sample.c File Reference

Entropy sampling. More...

#include <stdio.h>
#include <ipxe/entropy.h>
#include <ipxe/test.h>

Go to the source code of this file.

Macros
#define	SAMPLE_COUNT   65536
	Total number of test samples.
#define	SAMPLE_BLOCKSIZE   256
	Number of samples per block.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static void	entropy_sample (struct entropy_source *source)
	Generate entropy samples for external testing.
static void	entropy_sample_test_exec (void)
	Generate entropy samples for external testing.

Variables
struct self_test entropy_sample_test	__self_test
	Entropy sampling self-test.

Detailed Description

Entropy sampling.

Definition in file entropy_sample.c.

Macro Definition Documentation

SAMPLE_COUNT

#define SAMPLE_COUNT   65536

Total number of test samples.

Definition at line 37 of file entropy_sample.c.

Referenced by entropy_sample().

SAMPLE_BLOCKSIZE

#define SAMPLE_BLOCKSIZE   256

Number of samples per block.

Definition at line 40 of file entropy_sample.c.

Referenced by entropy_sample().

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

entropy_sample()

void entropy_sample ( struct entropy_source * source )

static

Generate entropy samples for external testing.

Parameters

source

Entropy source

Definition at line 47 of file entropy_sample.c.

                                                             {
        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 ( source );
                ok ( rc == 0 );
                for ( j = 0 ; j < SAMPLE_BLOCKSIZE ; j++ ) {
                        rc = get_noise ( source, &samples[j] );
                        ok ( rc == 0 );
                }
                entropy_disable ( source );
 
                /* Print out sample values */
                for ( j = 0 ; j < SAMPLE_BLOCKSIZE ; j++ ) {
                        printf ( "SAMPLE %s %d %d\n", source->name,
                                 ( i * SAMPLE_BLOCKSIZE + j ), samples[j] );
                }
        }
}

References entropy_disable(), entropy_enable(), get_noise(), entropy_source::name, ok, printf(), rc, SAMPLE_BLOCKSIZE, and SAMPLE_COUNT.

Referenced by entropy_sample_test_exec().

entropy_sample_test_exec()

void entropy_sample_test_exec ( void )

static

Generate entropy samples for external testing.

Definition at line 77 of file entropy_sample.c.

                                              {
        struct entropy_source *source;
 
        /* Test each entropy source */
        for_each_table_entry ( source, ENTROPY_SOURCES ) {
                entropy_sample ( source );
        }
}

References entropy_sample(), ENTROPY_SOURCES, and for_each_table_entry.

Variable Documentation

__self_test

struct self_test entropy_sample_test __self_test

Initial value:

= {
        .name = "entropy_sample",
        .exec = entropy_sample_test_exec,
}

Entropy sampling self-test.

Definition at line 87 of file entropy_sample.c.

                                                   {
        .name = "entropy_sample",
        .exec = entropy_sample_test_exec,
};