Mark,
Just to be clear, this is possible if you do not want to have key tainting with algorithms today. It can just be a symmetric key without an algorithm defined. It is only if you do want to have this done that there is a problem. From: [email protected] [mailto:[email protected]] On Behalf Of Mark Watson Sent: Sunday, November 10, 2013 7:09 PM To: John Bradley Cc: Jim Schaad; [email protected]; Michael Jones; [email protected] Subject: Re: [jose] #187: Define algorithm names for symmetric keys in for JWK John, I want to check that we have a common context here. The W3C WebCrypto API allows Javascript content on a web page to generate / agree / import keys which can then be used to encrypt arbitrary data, using a variety of algorithms (including non-AEAD ones). What data and what algorithms is up to the page developer and WebCrypto provides *plenty* of rope with which people can hang themselves, security-wise. There is an ambition to create a different, higher-level, API which would not provide so much rope. What we're working on now, though, is explicitly a low-level API with all the caveats that go with that. WebCrypto also allows keys to be imported and exported in JWK format. Are you saying that JWK is not really intended for this application ? Or that WebCrypto should not provide support for AES-CTR and AES-CBC at all (and if it does you want no part in supporting that with JWK) ? What about an application that wants to pass keys around in JWK format and then use those keys to decrypt some legacy data structure encrypted with AES-CTR ? ...Mark On Mon, Nov 11, 2013 at 10:45 AM, John Bradley <[email protected]> wrote: I agree that JOSE should not allow non-AEAD algorithms to be registered. I understand some people will want them. In the words of Nancy Reagan "Just say No" I think she also said something about your brain on non-AEAD. Who an I to argue with Nancy:) John B. On Nov 10, 2013, at 6:36 PM, Jim Schaad <[email protected]> wrote: Ii mean that I would like to prohibit anyone from registering a non-AEAD algorithm. Good practice says that you should have an AEAD type algorithm for encrypting a key so that it includes an integrity check as part of the decryption process. Any such algorithm would qualify as an AEAD algorithm. AES-CBC and AES-CTR do not have this property and therefore should be prohibited from being registered and used. Jim From: Mark Watson [ <mailto:[email protected]> mailto:[email protected]] Sent: Sunday, November 10, 2013 5:37 PM To: Jim Schaad Cc: Michael Jones; <mailto:[email protected]> [email protected]; <mailto:[email protected]> [email protected] Subject: Re: [jose] #187: Define algorithm names for symmetric keys in for JWK Jim, Do you mean that JOSE will not register non-AEAD algorithms in future or that you would like to prohibit anyone from registering such algorithms ? In W3C WebCrypto we support import / export of a WebCrypto Key object in JWK format and so I believe we will need alg / use / other attributes to reflect all the algorithms / usages and other properties that WebCrypto Key objects can have. ...Mark On Mon, Nov 11, 2013 at 5:30 AM, Jim Schaad < <mailto:[email protected]> [email protected]> wrote: While I agree this item is appropriately addressed as Won't Fix. I disagree that it would be appropriate for a later specification to define non-AEAD algorithm for encryption purposes. If you feel it is appropriate then I would like to make a change to the registration template to forbid it. Jim > -----Original Message----- > From: <mailto:[email protected]> [email protected] [mailto: <mailto:[email protected]> [email protected]] On Behalf Of > jose issue tracker > Sent: Friday, November 08, 2013 4:46 PM > To: <mailto:[email protected]> [email protected]; <mailto:[email protected]> [email protected]; > <mailto:[email protected]> [email protected] > Cc: <mailto:[email protected]> [email protected] > Subject: Re: [jose] #187: Define algorithm names for symmetric keys in for > JWK > > #187: Define algorithm names for symmetric keys in for JWK > > > Comment (by <mailto:[email protected]> [email protected]): > > A JOSE working group decision was made early on to only support > authenticated encryption algorithms. Neither of AES CBC or AES CTR are > authenticated encryption algorithms. > > There are registered algorithms for the composite AES-CBC-HMAC-SHA2 > algorithms, which do provide authenticated encryption, which could be used > when applicable. > > That being said, it would be fine for non-JOSE specifications to define and > register the values A{128,192,256}CTR and A{128,192,256}CBC. For instance, > a W3C WebCrypto specification could do this. But I believe that JOSE specs > defining these values is out of scope. > > Therefore, I believe that this issue should be closed as "wontfix". > > -- > -------------------------+---------------------------------------------- > -------------------------+--- > Reporter: | Owner: draft-ietf-jose-json-web- > <mailto:[email protected]> [email protected] | <mailto:[email protected]> [email protected] > Type: defect | Status: new > Priority: minor | Milestone: > Component: json-web- | Version: > algorithms | Resolution: > Severity: - | > Keywords: | > -------------------------+---------------------------------------------- > -------------------------+--- > > Ticket URL: < <http://trac.tools.ietf.org/wg/jose/trac/ticket/187#comment:2> http://trac.tools.ietf.org/wg/jose/trac/ticket/187#comment:2> > jose < <http://tools.ietf.org/jose/> http://tools.ietf.org/jose/> > > _______________________________________________ > jose mailing list > <mailto:[email protected]> [email protected] > <https://www.ietf.org/mailman/listinfo/jose> https://www.ietf.org/mailman/listinfo/jose _______________________________________________ jose mailing list <mailto:[email protected]> [email protected] <https://www.ietf.org/mailman/listinfo/jose> https://www.ietf.org/mailman/listinfo/jose
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