Consider the following pseudo$-$code for a PRNG which has seed and generate functions. The generate $(n)$ function produces $n$ bits. The PRNG is built on two cryptographic functions, a SecureHash which produces a $256-$bit hash value, and SecureEncrypt $($M$,$ key$),$ which is a secure block cipher operating on $32-$bit blocks and uses a $256-$bit key.

Internal state key, counter