Multiplication-only lambda splitter without bignum#127

Merged

sipa merged 3 commits intobitcoin-core:masterfrom sipa:scalarsplit

Dec 3, 2014

+187-127

Commits on Dec 2, 2014

Add secp256k1_scalar_mul_shift_var
sipa
committed
Avoid division when decomposing scalars

peterdettman
authored and
sipa
committed
Convert lambda splitter to pure scalar code.
sipa
committed