Hi all, I am required to implement the four DRBGs specified in SP 800-90 (HASH, HMAC, CTR, DUAL_EC). I previously received help from this group on that and it works just fine. The client however also required the following "...and ANS X9.62-2005 (HMAC)" on the randomness. I am unsure on how to enforce this via the API. What I did was to use the NID_X9_62_prime256v1 curve on the DUAL_EC DRBG. Is this ok? I am confused since the requirement states in brackets at the end: HMAC.
Can anybody direct me to something I should have read. Unfortunately I do not have access to the X9 specs. Regards Leon Brits
