Correct `secp256k1_gej_add_ge` with 3% performance hit on signing#261

Merged

sipa merged 4 commits intobitcoin-core:masterfrom apoelstra:add-fix

Jun 29, 2015

+157-20

Commits on Jun 23, 2015

gej_add_ge: rearrange algebra
apoelstra
committed

Commits on Jun 29, 2015

gej_add_ge: fix degenerate case when computing P + (-lambda)P
apoelstra
committed
tests: Add failing unit test for bitcoin-core#257 (bad addition formula)
apoelstra
committed
Add tests for adding P+Q with P.x!=Q.x and P.y=-Q.y

sipa
authored and
apoelstra
committed