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This still isn't the true random generator used in the live tools: it's deterministic, for repeatable testing. The Python side of testcrypt can now call random_make_prng(), which will instantiate a PRNG with the given seed. random_clear() still gets rid of it. So I can still have some tests control the precise random numbers received by the function under test, but for others (especially key generation, with its uncertainty about how much randomness it will actually use) I can just say 'here, have a seed, generate as much stuff from that seed as you need'.