30 lines
685 B
Plaintext
30 lines
685 B
Plaintext
#!/usr/bin/perl
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#
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# Perform primitive binning into 8-bit bins (take 8 bits 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 make a cup of coffee while
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# it runs. This program is a CPU Hog!
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#
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# $Id$
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#
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for ($i = 0; $i < (1024*32); $i++) {
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open(BIN, "/dev/urandom") || die "Cannot open /dev/urandom - $!\n";
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$len = sysread(BIN, $a, 256);
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close(BIN);
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if ($len > 0) {
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for ($j = 0; $j < $len; $j++) {
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$k = unpack("C", substr($a, $j, 1));
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$bin[$k]++;
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}
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}
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}
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for ($i = 0; $i < 256; $i++) {
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printf("%.2X ", $bin[$i]);
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}
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printf "\n";
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