Messages in this thread | | | Date | Sat, 18 Apr 2015 10:16:24 +0800 | From | Herbert Xu <> | Subject | Re: DRBG seeding |
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On Sat, Apr 18, 2015 at 04:04:14AM +0200, Stephan Mueller wrote: > > However, the only serious solution I can offer to not block is to use my > Jitter RNG which delivers entropy in (almost all) use cases. See [1]. The code > is relatively small and does not have any dependencies. In this case, we could > perform the initialization of the DRBG as follows: > > 1. pull buffer of size entropy + nonce from get_random_bytes > > 2. pull another buffer of size entropy + nonce from my Jitter RNG > > 3. XOR both
Don't xor them. Just provide them both as input to the seed function.
> 4. seed the DRBG with it > > 5. trigger the async invocation of the in-kernel /dev/random > > 6. return the DRBG instance to the caller without waiting for the completion > of step 5 > > This way, we will get entropy during the first initialization without > blocking. After speaking with mathematicians at NIST, that Jitter RNG approach > would be accepted. Note, I personally think that the Jitter RNG has sufficient > entropy in almost all circumstances (see the massive testing I conducted on > all more widely used CPUs). > > [1] http://www.chronox.de/jent.html
OK this sounds like it should satisfy everybody.
Thanks, -- Email: Herbert Xu <herbert@gondor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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