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The SP800-90 DRBG is implemented internally within Cisco. It is a CTR DRBG using AES256 as the block cipher. The crypto provider (for AES256) is OpenSSL0 0.9.8g-7.0.0 and the entropy provider is the hardware RNG on the Cavium Octeon Plus 5600 family data plane processor.
Version
Cavium Octeon Plus 5600 family CTR-DRBG-7.0.0 (Firmware)