Function dbl [src]

Double a P384 point.

Prototype

pub fn dbl(p: P384) P384

Parameters

p: P384

Source

  pub fn dbl(p: P384) P384 {
    var t0 = p.x.sq();
    var t1 = p.y.sq();
    var t2 = p.z.sq();
    var t3 = p.x.mul(p.y);
    t3 = t3.dbl();
    var Z3 = p.x.mul(p.z);
    Z3 = Z3.add(Z3);
    var Y3 = B.mul(t2);
    Y3 = Y3.sub(Z3);
    var X3 = Y3.dbl();
    Y3 = X3.add(Y3);
    X3 = t1.sub(Y3);
    Y3 = t1.add(Y3);
    Y3 = X3.mul(Y3);
    X3 = X3.mul(t3);
    t3 = t2.dbl();
    t2 = t2.add(t3);
    Z3 = B.mul(Z3);
    Z3 = Z3.sub(t2);
    Z3 = Z3.sub(t0);
    t3 = Z3.dbl();
    Z3 = Z3.add(t3);
    t3 = t0.dbl();
    t0 = t3.add(t0);
    t0 = t0.sub(t2);
    t0 = t0.mul(Z3);
    Y3 = Y3.add(t0);
    t0 = p.y.mul(p.z);
    t0 = t0.dbl();
    Z3 = t0.mul(Z3);
    X3 = X3.sub(Z3);
    Z3 = t0.mul(t1);
    Z3 = Z3.dbl().dbl();
    return .{
        .x = X3,
        .y = Y3,
        .z = Z3,
    };
}  