Function add [src]

Add two Edwards25519 points.

Prototype

pub fn add(p: Edwards25519, q: Edwards25519) Edwards25519

Parameters

p: Edwards25519q: Edwards25519

Source

  pub fn add(p: Edwards25519, q: Edwards25519) Edwards25519 {
    const a = p.y.sub(p.x).mul(q.y.sub(q.x));
    const b = p.x.add(p.y).mul(q.x.add(q.y));
    const c = p.t.mul(q.t).mul(Fe.edwards25519d2);
    var d = p.z.mul(q.z);
    d = d.add(d);
    const x = b.sub(a);
    const y = b.add(a);
    const z = d.add(c);
    const t = d.sub(c);
    return .{
        .x = x.mul(t),
        .y = y.mul(z),
        .z = z.mul(t),
        .t = x.mul(y),
    };
}  