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Re^8: Equivalent of unpack 'q' with 32-bit Perl (a8)

by Limbic~Region (Chancellor)
on Sep 07, 2016 at 20:54 UTC ( #1171334=note: print w/replies, xml ) Need Help??

in reply to Re^7: Equivalent of unpack 'q' with 32-bit Perl (a8)
in thread Equivalent of unpack 'q' with 32-bit Perl


If you really need to convert the whole digest to an integer

I just need to duplicate the result of unpack('q', md5($thing)) on 32bit Perl. I wrote something that works at home (see this thread) but it doesn't seem to work at work and I can't understand why.

Cheers - L~R

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Re^9: Equivalent of unpack 'q' with 32-bit Perl (a8)
by RonW (Vicar) on Sep 08, 2016 at 16:34 UTC

    This seems to do what you are asking:

    #!perl use strict; use warnings; use Digest::MD5 qw(md5 md5_hex); use Math::BigInt; my $foo = 'hello, world!'; my @v = unpack('q', md5($foo)); printf "%x %x\n", @v; my $h = substr(md5_hex($foo),0,16); # get first 8 bytes (pairs of hex +digits) my @w = reverse $h =~ /(..)/g; # split out the bytes and reverse +the order my $w = join('', @w); my $q = Math::BigInt->from_hex($w); print $q->as_hex();

    I was surprised that it was necessary to reverse the bytes to get the same result as unpack('q', md5($foo)) but that's what it took.

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