a8e7a312c6
Add some basic regression tests to verify behavior of both uint128 implementations at typical boundary conditions, to run on all architectures. Test uint128 increment behavior of Chacha in keystream mode, as used by 'kern.random.use_chacha20_cipher=1' (r344913) to verify assumptions at edge cases. These assumptions are critical to the safety of using Chacha as a PRF in Fortuna (as implemented). (Chacha's use in arc4random is safe regardless of these tests, as it is limited to far less than 4 billion blocks of output in that API.) Reviewed by: markm Approved by: secteam(gordon) Differential Revision: https://reviews.freebsd.org/D20392
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