mkj/dropbear DROPBEAR_2020.81

Dropbear 2020.81

on GitHub

Fix regression in 2020.79 which prevented connecting with some SSH
implementations. Increase MAX_PROPOSED_ALGO to 50, and print a log
message if the limit is hit. This fixes interoperability with sshj
library (used by PyCharm), and GoAnywhere.
Reported by Pirmin Walthert and Piotr Jurkiewicz

Fix building with non-GCC compilers, reported by Kazuo Kuroi

Fix potential long delay in dbclient, found by OSS Fuzz

Fix null pointer dereference crash, found by OSS Fuzz

libtommath now uses the same random source as Dropbear (in 2020.79
and 2020.80 used getrandom() separately)

Some fuzzing improvements, start of a dbclient fuzzer