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number of improvements for the /dev/random driver; the most important is the use of a ChaCha20-based CRNG for /dev/urandom, which is faster, more efficient, and easier to make scalable for silly/abusive userspace programs that want to read from /dev/urandom in a tight loop on NUMA systems.

This set of patches also improves entropy gathering on VM’s running on Microsoft Azure, and will take advantage of a hw random number generator (if present) to initialize the /dev/urandom pool.

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