eulersmile / ff-cairo

A Cairo implementation of finite field operations.

ff-cairo

An Cairo implementation of finite field operations.

GOAL

Our goal is to use Hints as little as possible. Actually, we only used Hints in two functions.

Design

We use BigInt3 as a unique representation of a big number, but unreduceBigInt3 to represent a big number with limbs in [-k\*BASE, k\*BASE] and unreduceBigInt5 with limbs in [-k\*BASE^2, k\*BASE^2].

Function bigint_div_mod is the one of the functions which use hints, it computes x/y^2 mod p. x is unreduceBigInt5 and y is unreduceBigInt3, return a BigInt3.

Other field computions can be done by calling this function.

For example, bigint_div_mul can be x\*y/1 mod p, with x, y are unreduceBigInt3.

Use examples

See common-ec-cairo for how to use this library.

License

MIT License © EulerSmile