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Digital Signature Verification

by perlPractioner (Novice)
on Apr 26, 2012 at 00:16 UTC ( #967206=perlquestion: print w/replies, xml ) Need Help??
perlPractioner has asked for the wisdom of the Perl Monks concerning the following question:

Greetings Monks, I need to verify the signature of a message sent to me (e.g.: Web token). The message is colon separated, with the ending being the signature. I have the public key stored as a binary file. I am trying to use Crypt::OpenPGP to validate this signature. I have never worked on something like this before, so that is why I am reaching out for some help. In the code below, I have the signature and the message in separate files. Ideally, the message (including the signature after the last colon) would be passed to me and I would parse it to get the signature. This is what I have so far:

#!/usr/bin/perl -w use strict; use Crypt::OpenPGP; #Public key stored in binary file my $pbkey = 'public.bin.key'; #This is how I would get message, which includes the signature #my $message = 'colon_separated_values'; #my $signature = 'parsed_string_from_message'; #Tried having the message and signature in separate files my $signature = 'sigFile.txt'; my $message = 'message.txt'; my $pubring = Crypt::OpenPGP::KeyRing->new(Filename => $pbkey) || die +"Pubring Failed: ",$pbkey->errstr; my $pgp = Crypt::OpenPGP->new(PubRing => $pubring) or die "Can't find +public key"; my $result = $pgp->verify( SigFile => $signature, Data => [ $message ] ) || die "Verification Failed: ",$pgp->errstr; if ($result) { print "Verified, signing key: $result\n"; } else { print "Bad signature!\n"; }

This outputs: "Verification Failed: SigFile contents are strange"
Not sure if I am on the right track here so would definitely appreciate any guidance you may offer. Thanks in advance.

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