Crypto headaches.

[SamG]

On Feb 18, 7:10 pm, "M.-A. Lemburg" <m... at egenix.com> wrote:
> On 2009-02-18 14:23, SamG wrote:
>
> > Hi,
>
> > Using the python's Crypto.Cipher.Blowfish is create and encrypted file
> > in the CBC mode. Now... when try to decrypt it with OpenSSL i get an
> > error stating "bad magic number".
>
> Are you getting the error message from openssl ? It looks a lot
> like an error message from Python.
>
> > I tried
> > $ cat encr-file | openssl bf-cbc -d -pass pass:sam > org-file
> > or
> > $ openssl bf-cbc -d -pass pass:sam -in encr-file -out org-file
>
> > BTW, decryption using a python code works well. But i m of the
> > impression a file encry with one program should/can be decrypt with
> > another program (in my case openssl) using the same parameters.
>
> Ideally, that should work, but you also have to make sure that
> the following two details are the same for both applications:
>
>  1. the way padding is done (Blowfish is a block cipher)
>
>  2. the way the initialization vector is set
>
> Otherwise the two won't interoperate properly.
>
> --
> Marc-Andre Lemburg
> eGenix.com
>
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That must be it...

But given a password how do i generate a (key, IV) pair???

SamG