Return 0 if invalid seckey is given to ec_privkey_negate#668

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jonasnick wants to merge 3 commits intobitcoin-core:masterfrom

jonasnick:privkey-negate

Commits on Oct 8, 2019

Return 0 if invalid seckey is given to ec_privkey_negate
jonasnick
committed
Add test for boundary conditions of scalar_set_b32 with respect to overflows
jonasnick
committed

Commits on Oct 28, 2019

Return 0 in privkey_negate for an all 0 seckey and move definition of valid secret keys to verify_seckey
jonasnick
committed