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o Minor features (performance, RNG):
- Tor now constructs a fast secure pseudorandom number generator for
each thread, to use for cases where performance is critical. This PRNG
is based on AES-CTR, using a buffering construction similar to
libottery and the (newer) OpenBSD arc4random() code. It outperforms
OpenSSL 1.1.1a's CSPRNG by roughly a factor of 100 for small outputs.
Although we believe it to be cryptographically strong, we are only
using it when necessary for reasonable performance. Implements tickets
29023 and 29536.
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