From ruby-talk  Tue Nov 27 15:05:20 2007
From: "Caleb Tennis" <caleb () aei-tech ! com>
Date: Tue, 27 Nov 2007 15:05:20 +0000
To: ruby-talk
Subject: Re: Problems with OpenSSL => RSA
Message-Id: <56277.192.168.2.159.1196175811.squirrel () www ! aei-tech ! com>
X-MARC-Message: https://marc.info/?l=ruby-talk&m=119617598614134

> It doesn't work :-(  The error message doesn't make sense to me, so
> I'm hoping someone can enlighten me.  Maybe I'm not using the
> libraries correctly.  Thanks for the help.

There's a good explanation here:

http://stuff-things.net/2007/06/11/encrypting-sensitive-data-with-ruby-on-rails/

The last paragraph is what you're looking for.

Basically, you can only encrypt a message with length up to your key size in bytes
(128) - 11 for padding, which is 117 bytes.  Depending on your total message size,
you'll have to either use a bigger key (which will make the encrypt/decrypt slower)
or use a different encryption/decryption model.

Caleb