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@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- 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
