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Re: Cypto CBC and Blowfish

by Khen1950fx (Canon)
on Apr 09, 2013 at 09:31 UTC ( #1027687=note: print w/ replies, xml ) Need Help??


in reply to Cypto CBC and Blowfish

Does this help?

#!/usr/bin/perl -l BEGIN { eval { require Crypt::Blowfish; }; } use strict; use warnings; use Crypt::CBC; my ( $line, $outf, $filen ); my $cipher = Crypt::CBC->new( -key => 'fjeislqp12345678', -cipher => 'Blowfish' ); $cipher->start('encrypting'); $filen = $ARGV[0]; $outf = "test.txt"; my $ciphertext = $cipher->encrypt($filen); my $plaintext = $cipher->decrypt($ciphertext); if ($@) { print "No data directory specified"; } open INFILE, '<', $filen or die "Can't open $filen for reading $!\n"; binmode INFILE, ":encoding(UTF-8)"; open OUTFILE, '>', $outf or die "Can't open $outf to write: $!"; binmode OUTFILE, ":encoding(UTF-8)"; $cipher->start('decrypting'); $plaintext = $cipher->decrypt($ciphertext); print OUTFILE "Decrypted $plaintext"; $cipher->finish(); close INFILE; close OUTFILE;


Comment on Re: Cypto CBC and Blowfish
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Re^2: Cypto CBC and Blowfish
by Will C (Initiate) on Apr 11, 2013 at 18:35 UTC

    This does not work for what I need as it only seems to encrypt and decrypt $filen and not the contents of the file. Perhaps the error has to do with the way I am writing the multi-line file out. I have tried using BINMODE however the output file is unreadable. Here is what my code does: I read a file and construct parameter name and parameter value pairs. I send these arrays to the code listed below for encryption. I then have a second Perl script which reads the encrypted file and decrypts it back to readable text. What I have tried: No BINMODE and I get the SALT error. Use BINMODE when outputting the encrypted file, use BINMODE when I read in the encrypted file. The result is the SALT error again. Use BINMODE when outputting the encrypted file, use BINMODE on both the input and output files when decrypting and the result is an output file in binary not text. Perhaps I am not understanding what you are trying to convey? Below is the code for encrypting:

    use Crypt::CBC; my $cipher = Crypt::CBC->new( -key => 'fjeislqp12345678', -cipher => 'Blowfish'); # get input arrays my($name, $value) = @_; # open output files my($latest_file,$all_file, $latest_all_file); my($param_name, $param_value,$file_time,$lineout); my($cipher_text); $file_time = get_time_for_file(); $latest_file = "C:\\hc\\logs\\SC\\TO\\Bode_" . $utid . "_latest_" +. $file_time . ".txt"; open(LATEST, ">>",$latest_file) or die "Can't open $latest_file $! +\n"; binmode LATEST, ":encoding(UTF-8)"; # $cipher->start('encrypting'); for (my $i=0; $i < @$name; $i++) { $param_name = $name->[$i]; $param_value = $value->[$i]; $lineout = $param_name . "," . $param_value . "," . $filedate +. "," . $utid . "\n"; print LATEST $cipher->encrypt($lineout); } print LATEST $cipher->finish(); close(LATEST);

    Below is the code to decrypt:

    #!C:\strawberry\perl\bin\perl # BEGIN { eval { require Crypt::Blowfish; }; } use Crypt::CBC; # my ($line, $outf, $filen); my $cipher = Crypt::CBC->new( -key => 'fjeislqp12345678', -cipher => 'Blowfish'); # get filename if($#ARGV == -1) { print STDERR "$runtime::No data directory specified on the com +mand line\n"; close(STDERR); exit; } $filen = $ARGV[0]; # # $outf = $ARGV[0]; $outf = "test.txt"; open(INFILE,$filen) or die "Can't open $filen for reading $!\n"; binmode INFILE, ":encoding(UTF-8)"; open(OUTFILE, ">>", $outf) or die "Can't open $outf to write: $!\n +"; # binmode OUTFILE, ":encoding(UTF-8)"; $cipher->start('decrypting'); # print OUTFILE $cipher->decrypt($_) while(<INFILE>); while (<INFILE>) { $line = $_; print OUTFILE $cipher->decrypt($line); } # print OUTFILE $cipher->finish(); $cipher->finish(); close(INFILE); close(OUTFILE);

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