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Yeah, chacha was an odd choice because AES is a lot faster on CPUs with acceleration. Just doing a few AES rounds would be a pretty fast, good PRNG.

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For those interested in using AES with reduced rounds as a PRNG, it is covered in the paper "Parallel Random Numbers: As Easy as 1, 2, 3" by John Salmon et al.

https://www.thesalmons.org/john/random123/papers/random123sc...

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