Compute ECDSA modular inverses with Fermal's Little Theorem. am: 1f170d0b00 am: 10c2234fb3 am: 77658a7f05 am: 14b44d83f2  -s ours am: 714afb8f3d am: a968399736 am: 1b75e28e6e
am: b47a4aea2e

Change-Id: I0901e32f3c136ffc465da1d6b710359323cf2f55