From: Brian Candler <b.candler@...>
Date: 2008-10-21T17:02:59+09:00
Subject: Re: Encrypting using openssl Triple-DES

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.
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