Currently curve25519 do not provide a method to print x coordinate of a point and our serialize method is using (x,y). Our current solution is to serielize (y,y) and derive x from y. We need to update the our serde such that it will support one coordinate . or to implement the coordinate derivation ourselves:
//taken from https://doc-internal.dalek.rs/src/curve25519_dalek/edwards.rs.html#144
let y = self.ge.as_bytes().clone();
let Y = SK::from_bytes_mod_order(y);
let Z = SK::one();
let YY = Y*Y;
let u = &YY - &Z;
let v = &(&YY * &constants::EDWARDS_D) + &Z;
let (is_nonzero_square, mut X) = sqrt_ratio(&u, &v);
omershlo
commented
5 years ago
https://github.com/KZen-networks/cryptography-utils/blob/master/src/elliptic/curves/curve25519.rs#L133
Currently curve25519 do not provide a method to print x coordinate of a point and our serialize method is using (x,y). Our current solution is to serielize (y,y) and derive x from y. We need to update the our serde such that it will support one coordinate . or to implement the coordinate derivation ourselves: