Kriloff,
Henric Jungheim has an open-source implementation of CTR_DRBG at 
http://henric.info/random/, which works well and passes NIST's sample DRBGVS 
test vectors.
Henric's code can be adapted to OpenSSL rather easily, however note that SP 
800-90 requires entropy input and periodic reseeding - this should probably be 
done by explicit user calls to RAND_seed().

--Yair


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