On Wed, Oct 21, 2015 at 1:06 PM, <dj@xxxxxxxxxxx> wrote: > I've only looked at it briefly, but I have a question.. Are you trying to > use the GCM Galois multiply as an entropy extractor? Yes, the basic idea is to use a series of GCM multiplies over the pool data to replace the hashing of that data in the current driver. There are complications; each hash uses two quasi-constants -- initialiser and GCM multiplier -- and hashes a counter along with the pool data. The counter changes on every iteration and is sometimes changed more drastically, and the constants are sometimes updated > I don't know of any proof that it is a good extractor for any class of > entropic data. That doesn't mean there isn't one, but I've not heard of > one. Good question. It seems to me th at if it is secure for its authentication usage, where it replaces an HMAC, then it should be safe in this application. But no, I don't have a proof & the question is worth some analysis. -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
