Retry if r is zero during signing#732

Merged

jonasnick merged 2 commits intobitcoin-core:masterfrom

real-or-random:202003-revert-25e3cfb

Apr 18, 2020

Commits on Mar 31, 2020

Revert "ecdsa_impl: replace scalar if-checks with VERIFY_CHECKs in ecdsa_sig_sign"
real-or-random
committed
Make ecdsa_sig_sign constant-time again after reverting 25e3cfb
real-or-random
committed