我想在我的 RPI3 中使用内置的硬件随机数生成器进行项目。目前我只能使用 /dev/hwrng 来保存二进制转储
dd if=/dev/hwrng of=data.bin bs=25 count=1
我的项目需要的是从随机源 (/dev/hwrng) 以 1 次读取/秒的频率读取 200 位长的数据块,并计算其中的 1 并将结果以十进制形式写入带有时间戳,像这样:
datetime, value
11/20/2018 12:48:09, 105
11/20/2018 12:48:10, 103
11/20/2018 12:48:11, 97
十进制数应始终接近 100,因为它是一个随机数据源,并且预期的 1 和 0 的数量应该相同。任何帮助表示赞赏....
我确实想出了一个接近我不想要的 perl 脚本,所以让我分享一下。我相信它可以以更清洁的方式完成......
#!/usr/bin/perl
use strict;
use warnings;
use DateTime;
my @bitcounts = (
0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, 2, 3,
3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4,
3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 1, 2,
2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5,
3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5,
5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3,
2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4,
4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4,
4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6,
5, 6, 6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 4, 5,
5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
);
for (my $i=0; $i <= 10; $i++) {
system("dd if=/dev/hwrng of=temprnd.bin bs=25 count=1 status=none");
my $filename = 'temprnd.bin';
open(my $fh, '<', $filename) or die "$!";
binmode $fh;
my $count = 0;
my $byte = 0;
while ( read $fh, $byte, 1 ) {
$count += $bitcounts[ord($byte)];
}
my $dt = DateTime->now;
print join ',', $dt->ymd, $dt->hms,"$count\n";
system("rm temprnd.bin");
sleep 1;
}
__END__