Function addMixed [src]

Add P256 points, the second being specified using affine coordinates.

Prototype

pub fn addMixed(p: P256, q: AffineCoordinates) P256

Parameters

p: P256q: AffineCoordinates

Source

  pub fn addMixed(p: P256, q: AffineCoordinates) P256 {
    var t0 = p.x.mul(q.x);
    var t1 = p.y.mul(q.y);
    var t3 = q.x.add(q.y);
    var t4 = p.x.add(p.y);
    t3 = t3.mul(t4);
    t4 = t0.add(t1);
    t3 = t3.sub(t4);
    t4 = q.y.mul(p.z);
    t4 = t4.add(p.y);
    var Y3 = q.x.mul(p.z);
    Y3 = Y3.add(p.x);
    var Z3 = B.mul(p.z);
    var X3 = Y3.sub(Z3);
    Z3 = X3.dbl();
    X3 = X3.add(Z3);
    Z3 = t1.sub(X3);
    X3 = t1.add(X3);
    Y3 = B.mul(Y3);
    t1 = p.z.dbl();
    var t2 = t1.add(p.z);
    Y3 = Y3.sub(t2);
    Y3 = Y3.sub(t0);
    t1 = Y3.dbl();
    Y3 = t1.add(Y3);
    t1 = t0.dbl();
    t0 = t1.add(t0);
    t0 = t0.sub(t2);
    t1 = t4.mul(Y3);
    t2 = t0.mul(Y3);
    Y3 = X3.mul(Z3);
    Y3 = Y3.add(t2);
    X3 = t3.mul(X3);
    X3 = X3.sub(t1);
    Z3 = t4.mul(Z3);
    t1 = t3.mul(t0);
    Z3 = Z3.add(t1);
    var ret = P256{
        .x = X3,
        .y = Y3,
        .z = Z3,
    };
    ret.cMov(p, @intFromBool(q.x.isZero()));
    return ret;
}  