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Re: Exchanging md5s between Perl and C

by jettero (Monsignor)
on Oct 28, 2010 at 18:58 UTC ( #868119=note: print w/replies, xml ) Need Help??

in reply to Exchanging md5s between Perl and C

It seems to me it's your line endings...

echo -n "a" | md5sum gives me the same thing as md5_hex("a"). "a\n" and "a" should not hash to the same thing.

  • "a" should be: 0cc175b9c0f1b6a831c399e269772661
  • "a\x0a" should be: 60b725f10c9c85c70d97880dfe8191b3
  • "a\x0d\x0a" should be: 0c629e1d3acda389c88a213374ec62fc

It's also worth noting that Digest::MD5 really is C, as much as /usr/bin/md5sum is: MD5.xs.

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Re^2: Exchanging md5s between Perl and C
by bart (Canon) on Oct 28, 2010 at 19:14 UTC
    I'm pretty sure that is indeed the cause. Here's a test using md5sum from Perl:
    open OUT, '>', 'tempfile'; print OUT 'a'; close OUT; system('md5sum', '-b', 'tempfile');
    0cc175b9c0f1b6a831c399e269772661 *tempfile
    So yeah, md5sum and Digest::MD5 agree.

    It's the OP's other tests that were flawed.

      ahhk! thank you very much, yes that was it.

      I previously had an issue with 32/64 bit and after going round and round until fixed, somewhere along the line I stared chasing my tail overlooking that minor but oh so important detail.

      cheers for you time! Glad it was as simple as that

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[LanX]: I have my doubts, IMHO its a workaround if the glyph is missing
[LanX]: (they are pronounced differently)
[choroba]: perl -Mutf8 -Mfeature=fc -wE 'say fc "straße" eq fc "strasse"'
[choroba]: returns 1 for me
[choroba]: are they?
[LanX]: strict rules : the a is long in "straße" and short in "strasse"
[choroba]: So the "a" is different, not the "s" ;-)
[LanX]: people knowing that it's a workaround will pronounce it right
[LanX]: well
[LanX]: Maße and Masse are two very different words.

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