make([]byte, len(b)) testingReader.Read(bb) copy(b, bb) return } if !fips140.Enabled { sysrand.Read(b) return } // At every read, 128 random bits from the operating system are mixed as // additional input, to make the output as strong as non-FIPS randomness. // This is not credited as entropy for FIPS purposes, as allowed by Section // 8.7.2: "Note that a DRBG does not rely on additional input to provide // entropy, even though entropy could be provided in the additional input". additionalInput :=...