From: Justin Collins <justincollins@...>
Date: 2010-02-11T13:02:19+09:00
Subject: Re: trouble using blowfish

Ashita Hara wrote:
> Hello Group,
>
> ruby version: ruby 1.9.1p243
>
> I get the following error when I try creating a new instance of
> blowfish.
>
> irb(main):001:0> require 'crypt/blowfish'
> => true
>
> irb(main):002:0> blowfish = Crypt::Blowfish.new("key")
> TypeError: can't convert String into Integer
>   from
> /usr/local/ruby/lib/ruby/gems/1.9.1/gems/crypt-1.1.4/crypt/blowfish.rb:47:in
> `|'
>   from
> /usr/local/ruby/lib/ruby/gems/1.9.1/gems/crypt-1.1.4/crypt/blowfish.rb:47:in
> `block (2 levels) in setup_blowfish'
>   from
> /usr/local/ruby/lib/ruby/gems/1.9.1/gems/crypt-1.1.4/crypt/blowfish.rb:46:in
> `times'
>   from
> /usr/local/ruby/lib/ruby/gems/1.9.1/gems/crypt-1.1.4/crypt/blowfish.rb:46:in
> `block in setup_blowfish'
>   from
> /usr/local/ruby/lib/ruby/gems/1.9.1/gems/crypt-1.1.4/crypt/blowfish.rb:44:in
> `upto'
>   from
> /usr/local/ruby/lib/ruby/gems/1.9.1/gems/crypt-1.1.4/crypt/blowfish.rb:44:in
> `setup_blowfish'
>   from
> /usr/local/ruby/lib/ruby/gems/1.9.1/gems/crypt-1.1.4/crypt/blowfish.rb:27:in
> `initialize'
>   from (irb):2:in `new'
>   from (irb):2
>   from /usr/bin/irb:12:in `<main>'
>
> The problem seems to be on the code presented below:
>
> 46: 4.times {
> 47:   data = ((data << 8) | @key[keypos]) % ULONG
> 48:   keypos = (keypos.next) % @key.length
> 49: }
>
> # data = 0
> # @key = "key"
> # keypos = 0
> # ULONG = 0x100000000
>
> On line 47, data <<8 is an integer and @key[keypos]) % ULONG is a
> string.
> This is probably the causing 'can't convert String into Integer' error.
>
> I have very limited programing knowledge and I do not know the best way
> to fix this code.
> Any help will be greatly appreciated.
>
> Regards,
> Ashita
>   

The gem you are using apparently has not been updated to work with Ruby 1.9.

You can try changing @key[keypos] to @key[keypos].ord

However, there may be other incompatibilities in the gem.

-Justin