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comp.lang.ruby

Encrypting using openssl Triple-DES

Dani Pardo

10/20/2008 3:56:00 PM

Hi, I need to encrypt some data using Triple DES in ECB mode
(DES-EDE3-ECB), but I don't know how to do it. If I create the cipher
like this:

e = OpenSSL::Cipher::Cipher.new 'DES-EDE3'

It seems (man enc) that des-ede3 is an alias for des-ede3-cbc, so
there seems to be no way of encrypting with des-ede3-ecb?

Thanks in advance,

--
Dani
2 Answers

Brian Candler

10/21/2008 8:03:00 AM

0

Dani Pardo wrote:
> Hi, I need to encrypt some data using Triple DES in ECB mode
> (DES-EDE3-ECB), but I don't know how to do it. If I create the cipher
> like this:
>
> e = OpenSSL::Cipher::Cipher.new 'DES-EDE3'
>
> It seems (man enc) that des-ede3 is an alias for des-ede3-cbc, so
> there seems to be no way of encrypting with des-ede3-ecb?

'man enc' on my system says:

des-ede3-cbc Three key triple DES EDE in CBC mode
des-ede3 Three key triple DES EDE in ECB mode
des3 Alias for des-ede3-cbc
des-ede3-cfb Three key triple DES EDE CFB mode
des-ede3-ofb Three key triple DES EDE in OFB mode

That is: "des-ede3" gives you ECB.

This is with:

ii libssl0.9.8 0.9.8g-4ubuntu3.3
SSL shared libraries

So perhaps you have some old version of openssl installed - or perhaps
you didn't read the manpage properly.

In any case, I'd suggest that openssl-specific questions really belong
on an openssl mailing list, since this wasn't anything to do with the
Ruby bindings.
--
Posted via http://www.ruby-....

Dani Pardo

10/21/2008 8:50:00 AM

0

On Tue, Oct 21, 2008 at 10:02 AM, Brian Candler <b.candler@pobox.com> wrote:
be no way of encrypting with des-ede3-ecb?
>
> 'man enc' on my system says:
>
> des-ede3-cbc Three key triple DES EDE in CBC mode
> des-ede3 Three key triple DES EDE in ECB mode
> des3 Alias for des-ede3-cbc
> des-ede3-cfb Three key triple DES EDE CFB mode
> des-ede3-ofb Three key triple DES EDE in OFB mode
>
> That is: "des-ede3" gives you ECB.
>
> This is with:
>
> ii libssl0.9.8 0.9.8g-4ubuntu3.3
> SSL shared libraries
>
> So perhaps you have some old version of openssl installed - or perhaps
> you didn't read the manpage properly.
>

Indeed, on previous openssl versions, des-ede3 was an alias for
triple des with cbc mode.
The problem now is that ruby uses its own shared library (openssl.dll
/openssl.so). And openssl doesn't seem to come with any file named
openssl.dll/.so, so I don't know how to upgrade this now, especially
on Windows. :?

--
Dani