Interesting idea. Do you analyze the header to make sure the gap is there and of expected size and the LUKS version is known to the library? What happens if somebody did a non-default configuration? What happens with a different header than LUKS v1? Regards, Arno On Fri, May 13, 2016 at 18:01:06 CEST, Nathaniel McCallum wrote: > https://github.com/latchset/luksmeta > > Hi everyone! Several projects that I am working on or related to > require the ability to store some small metadata that is accessable > before the LUKS volume is unlocked. Since this was not possible with > LUKSv1, and we couldn't wait until LUKSv2, we created a small library > called LUKSMeta. > > This simple library allows an application developer to store some > metadata in the gap in the LUKSv1 header (between the end of the > keyslots and the start of the payloadOffset). There are up to eight > "slots" of metadata, similar to the eight keyslots of LUKS. Each slot > is typed by a 16-byte UUID, so that applications don't stomp on each > others' data. Both the LUKSMeta header and the data in each slot is > checksummed (CRC32c) to detect data corruption. > > There are four simple functions: > > * luksmeta_init() - Write the LUKSMeta header to disk > * luksmeta_get() - Read data/uuid from a LUKSMeta slot > * luksmeta_set() - Write data/uuid to a LUKSMeta slot > * luksmeta_del() - Clear (zero) a LUKSMeta slot > > More detailed documentation is available in the header: > https://github.com/latchset/luksmeta/blob/master/luksmeta.h > > I have not made the first release, but I would like to do so soon. I > welcome your review/feedback. Thanks! > > Nathaniel > _______________________________________________ > dm-crypt mailing list > dm-crypt@xxxxxxxx > http://www.saout.de/mailman/listinfo/dm-crypt -- Arno Wagner, Dr. sc. techn., Dipl. Inform., Email: arno@xxxxxxxxxxx GnuPG: ID: CB5D9718 FP: 12D6 C03B 1B30 33BB 13CF B774 E35C 5FA1 CB5D 9718 ---- A good decision is based on knowledge and not on numbers. -- Plato If it's in the news, don't worry about it. The very definition of "news" is "something that hardly ever happens." -- Bruce Schneier _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
