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Subject: Re: [xcbf] X9.84 question - Representation of dates/times
On Fri, 12 Apr 2002, Phil Griffin wrote: > > > Bancroft Scott wrote: > > > > On Fri, 12 Apr 2002, Phil Griffin wrote: > > > > > As I stated in this thread, if the receiver preserves the > > > encoding used in the signature process as sent, it does > > > not even matter if the encoding is not canonical or that > > > it is encoded correctly. > > > > > > But an LDAP thread recently reveals that the receiver often > > > does not preserve the original encoding of DER objects, which > > > can mask encoding errors that become apparent only when > > > the receiver tries to encode again and the signature > > > check fails. > > > > I think that this is a bit different, Phil. Given that RELAIVE-OID > > is in use, any change to it between decoding and re-encoding would > > be fundamental. It would be exactly as if we had the likes of > > "name UTF8String,". Although "Bancroft Scott" and "Bancroft Scott " > > are the same abstract values in a sense, we don't make rules for > > applications to follow about what to do about trailing blanks. Along > > Actually Bancroft, you're totally wrong here. You're > thinking only about the sorts of rules you commonly > make in the ASN.1 standards. This is an application > standard, and it would be perfectly within scope to > assert that trailing blanks should not be used by a > message sender. The two strings you provide in fact > would fail an exact match test, yet they would appear > when displayed to a human user exactly the same. I *think* I follow what you are saying - what we are specifying here is at the application level, so it is appropriate to impose such rules. No argument. So, do you wish to forbid trailing 0's in RELATIVE-OID's when they are used for date-time? What about UTF8String values in particular uses, do we restrict trailing blanks? Anything else that we should be considering? ------------------------------------------------------------------------- Bancroft Scott Toll Free :1-888-OSS-ASN1 OSS Nokalva International:1-732-302-0750 baos@oss.com Tech Support :1-732-302-9669 x-1 1-732-302-9669 x-200 Fax :1-732-302-0023 http://www.oss.com
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