import ( "crypto/internal/fips140" "crypto/internal/fips140/aes" "crypto/internal/fips140/subtle" "crypto/internal/fips140deps/byteorder" "math/bits" ) // Counter is an SP 800-90A Rev. 1 CTR_DRBG instantiated with AES-256. // // Per Table 3, it has a security strength of 256 bits, a seed size of 384 bits, // a counter length of 128 bits, a reseed interval of 2^48 requests, and a // maximum request size of 2^19 bits (2^16 bytes, 64 KiB). // // We support a narrow range of parameters that fit the needs...