bitcoin/secp256k1 — pull request #85 by sipa (2014-11-02 09:25:43+00:00)
Title: Fix interaction between magnitudes and negation

Magnitude m means values are allowed to be up to 2 * 0xFFF...FFF * m, while the argument passed to secp256k1_fe_negate didn't take the 2 into account. Fix this.