I do not think canonical means only one way to represent.
Extensions have always been a SEQUENCE with their OID denoting what
extension is next and their syntax.
Actually, we find SET in the case of RDN problematic.
From: Ben Laurie [mailto:ben(_at_)links(_dot_)org]
Sent: Thursday, January 01, 2009 2:40 PM
To: Santosh Chokhani
Cc: Paul Hoffman; cfrg(_at_)irtf(_dot_)org; ietf-smime(_at_)imc(_dot_)org;
Subject: Re: [saag] [Cfrg] Further MD5 breaks: Creating a rogue
Santosh Chokhani wrote:
We must fix X.509 since it is not broken.
I am not suggesting that we should fix X.509, I am pointing out, in my
own roundabout way, that X.509 certs are supposed to have a canonical
form. But it seems they do not.
Makes me wonder why we go to all the effort of using a supposedly
canonical encoding that isn't? If we can only rely on the original bits
in the cert when checking the signature, why bother?
"There is no limit to what a man can do or how far he can go if he
doesn't mind who gets the credit." - Robert Woodruff