Random number generator (device): Difference between revisions
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return 0;
}</lang>
=== debian/linux made from scratch ===
{{works with|GCC}}
<lang c>
#include <stdio.h>
#include <stdlib.h>
/*
(C) 2020 J.G.A. Debaere, all rights reserved 2020/10/29
Put into Public Domain for individuals only
Tested with NIST, Diehard, Diehard 3.31
gcc -lm ./jpsrand_f.c -o ./jpsrand_f.o
dieharder -a -f /tmp/tmp.bin
I consider it TRNG,
using Time, Hardddisk and Memory as the hardware component
No warranty of any kind, "AS IS"
Last time I tested ( 2021/07/07 ) with dieharder:
rgb_bitdist | 8| 100000| 100|0.99716738| WEAK
rgb_lagged_sum | 3| 1000000| 100|0.99661184| WEAK
Out of 114 tests, rest PASSED
*/
unsigned int jps_rand()
{
/* (C) 2020 J.G.A. Debaere, all rights reserved */
#include <dirent.h>
#include <sys/time.h>
struct timeval current_time ;
DIR *folder ;
struct dirent *en ;
folder = opendir ( "." ) ;
while ( ( folder ) && ( en = readdir ( folder ) ) != NULL )
asm ( "nop" ) ;
closedir ( folder ) ;
gettimeofday( ¤t_time, NULL ) ;
unsigned int t = ( current_time.tv_sec * current_time.tv_usec / 17.17 ) ;
return t ;
}
int main()
{
FILE * f1;
f1 = fopen("/tmp/tmp.bin", "wb");
unsigned int t = ( unsigned int ) jps_rand() ;
for ( unsigned int k = 0; k < 40000000 ; k++ )
{
t = jps_rand () ;
fwrite ( &t, sizeof( unsigned int ), 1, f1 ) ;
}
fflush(f1);
fclose(f1);
return 0;
}
</lang>
JPD 2021/07/07
Output:
Random
=={{header|C++}}==
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