#!/usr/bin/perl
use strict;
use Crypt::RSA;

my $message="string";
my $rsa = new Crypt::RSA;
my ($public, $private) = $rsa->keygen( Size => 64 );
print "My Public key is: $public ", $public->serialize();
print "My Private key is: $private", $private->serialize();
my $c = $rsa->encrypt( Message => $message, Key => $public, ) or warn "$!\n";
print "My cipher text is: $c\n";
my $nmessage = $rsa->decrypt( Ciphertext => $c, Key => $private, );
print "My plain text is: $nmessage\n";

##</code><code>##

....
......
....
sub encrypt {

    my ($self, %params)   = @_;
    my $plaintext         = $params{Message} || $params{Plaintext};
    my $key               = $params{Key};

        print "\n$plaintext\n$key\n";
    return $self->error ($key->errstr, \%params, $key, \$plaintext)
        unless $key->check();
        print "\nAfter self error\n";
    my $blocksize = blocksize ( $$self{es}->encryptblock (Key => $key),
                                length($plaintext)
                              );
        print "\nAfter block size\n";
    return $self->error("Message too long.", \$key, \%params) if $blocksize <= 0;
        print "\nAfter self error\n";
    my $cyphertext;
....
....

##</code><code>##

My Public key is: Crypt::RSA::Key::Public=HASH(0x8132390) $VAR1 = bless( {
                 'e' => 65537,
                 'n' => '10270622025769038677',
                 'Version' => '1.91'
               }, 'Crypt::RSA::Key::Public' );
My Private key is: Crypt::RSA::Key::Private=HASH(0x8132378)$VAR1 = bless( {
                 'Version' => '1.91',
                 'Checked' => 0,
                 'private' => {
                                '_phi' => '10270622019208864620',
                                '_n' => '10270622025769038677',
                                '_q' => '2581267387',
                                '_p' => '3978906671',
                                '_u' => '564982676',
                                '_dp' => '2208958913',
                                '_dq' => '2285751125',
                                '_d' => '4317024349041710693',
                                '_e' => '65537'
                              },
                 'Cipher' => 'Blowfish'
               }, 'Crypt::RSA::Key::Private' );

string
Crypt::RSA::Key::Public=HASH(0x8132390)

After self error
Can't call method "encryptblock" on an undefined value at /usr/lib/perl5/site_perl/5.8.0/Crypt/RSA.pm line 98.