- From: Tom Ritter <tom@ritter.vg>
- Date: Thu, 8 May 2014 20:24:20 -0400
- To: Ryan Sleevi <sleevi@google.com>
- Cc: Tankred Hase <tankred@whiteout.io>, "public-webcrypto-comments@w3.org" <public-webcrypto-comments@w3.org>
I'm not sure. OpenPGP's CFB mode has a little twist in it where it re-synchronizes with 2 bytes after the first encryption operation, which throws the whole thing off from 'vanilla' CFB. The segment size goes from the block size in the first call, to 16 (bits) for the next call, and then back to the block size. The WebCrypto API states the segment size for CFB mode is fixed at 8 bits. -tom On 8 May 2014 20:02, Ryan Sleevi <sleevi@google.com> wrote: > Tankred, > > You should be able to implement OpenPGP's CFB mode atop the existing CFB > mode fairly easily. There shouldn't be a need to include it as a 'special' > mode. Have you tried? > > > On Tue, May 6, 2014 at 3:40 PM, Tankred Hase <tankred@whiteout.io> wrote: >> >> Hi, >> >> I'm a contributor to OpenPGP.js and the libraray uses the OpenPGP CFB >> Mode (http://www.ietf.org/rfc/rfc4880.txt 13.9.) >> >> Here's the corresponding js code that I would like to replace with the >> native implementation from the web crypto api: >> >> https://github.com/openpgpjs/openpgpjs/blob/e1dffffe8d8e367230e920f3ec5bacda56c0a7d3/src/crypto/cfb.js#L87 >> >> As far as I understand CFB mode is currently not supported in the >> current spec. I was wondering if this requirement is too specific or >> if it would make sense to add it to the spec, considering PGP is a >> common use case for email. Thanks! >> >> Kind regards, >> Tankred >> >> -- >> Whiteout Networks GmbH c/o Werk1 >> Grafinger Str. 6 >> D-81671 München >> Geschäftsführer: Oliver Gajek >> RG München HRB 204479 >> >> >
Received on Friday, 9 May 2014 00:25:11 UTC