On Thu, Feb 12, 2009, Jan C. wrote:

> Hi,
> ok, so the clear text signature general form is something like:
> 
> 
> ------A3DB62BE42E8E4D7716813FA55957190
> 
> My Signed Text
> 
> ------A3DB62BE42E8E4D7716813FA55957190
> Content-Type: application/x-pkcs7-signature; name="smime.p7s"
> Content-Transfer-Encoding: base64
> Content-Disposition: attachment; filename="smime.p7s"
> 
> MIIFlgYJKoZIhvcNAQcCoIIFhzCCBYMCAQExCzAJBgUrDgMCGgUAMAsGCSqGSIb3
> .......
> 
> ------A3DB62BE42E8E4D7716813FA55957190--
> 
> 
> 
> And the opaque is the same thing but entirely encoded en B64 and
> attached to the email as attachment ? Is that correct ?
> 

Cleartext would have MIME headers in the first part.

Opaque includes the content in the signature structure so you only get one
part.

If you want to see what they look like generate a few with the smime utility.

Steve.
--
Dr Stephen N. Henson. Email, S/MIME and PGP keys: see homepage
OpenSSL project core developer and freelance consultant.
Homepage: http://www.drh-consultancy.demon.co.uk
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