30 lines
694 B
Perl
30 lines
694 B
Perl
#!/usr/bin/perl
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#
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# Perform primitive binning into 16-bit bins (take 16bits of randomness
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# at a time) and see if the distribution is flat. The output should be
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# checked by eye - are all the numbers roughly the same?
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#
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# Redirect the output from this to a file - and go to the movies while
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# it runs. This program is a CPU Hog!
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#
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# $FreeBSD$
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#
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for ($i = 0; $i < (1024*64); $i++) {
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open(BIN, "/dev/urandom") || die "Cannot open /dev/urandom - $!\n";
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$len = sysread(BIN, $a, 512);
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close(BIN);
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if ($len > 0) {
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for ($j = 0; $j < $len; $j += 2) {
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$k = unpack("S", substr($a, $j, 2));
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$bin[$k]++;
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}
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}
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}
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for ($i = 0; $i < 1024*64; $i++) {
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printf("%.2X ", $bin[$i]);
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}
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printf "\n";
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