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7003b43963
We keep an internal 128-bit counter that's used as part of the hash preimages. There's no real need to import all the mp_int machinery in order to implement that: we can do it by hand using a small fixed-size array and a trivial use of BignumADC. This is another inter-module dependency that's easy to remove and useful to spinoff programs. This changes the hash preimage calculation in the PRNG, because we're now formatting our 128-bit integer in the fixed-length representation of 16 little-endian bytes instead of as an SSH-2 mpint. This is harmless (perhaps even mildly beneficial, due to the length now not depending on how long the PRNG has been running), but means I have to update the PRNG tests as well.