I created this package about 4 years ago when I was building a lot of custom IRC bots. Several bots idled inside channels which used Blowfish to encrypt their communication. I am opensourcing it, hopefully somebody has some use for it.
The code was reverse engineered from several C and Perl applications. I sadly do not remember which ones.
# package
use Blowfish;
# encrypt
my $encrypted = Blowfish::encrypt('this is plaintext', 'secret_key');
# decrypt
my $decrypted = Blowfish::decrypt($encrypted, 'secret_key');
# prints 'hwwnV0UVbDE1z2N0E0AZlBT/Mi965/OLpHf/'
print $encrypted ."\n";
# prints 'this is plaintext'
print $decrypted ."\n";
To be able to use it inside a IRC channel, you need to prefix the encrypted string with +OK.
# send to irc channel
print $ircSocket 'PRIVMSG #channel :+OK'. $encrypted;