ref: 7534d64087f04ba99d383c51f246bb37f76f67e6
dir: /sys/src/libauthsrv/ed448.mp/
# Edwards Curve Ed448-Goldilocks
# x^2+y^2 = 1-39081x^2y^2
ed448_curve(p,a,d,x,y) {
p = 2^448 - 2^224 - 1;
a = 1;
d = -39081;
x = 117812161263436946737282484343310064665180535357016373416879082147939404277809514858788439644911793978499419995990477371552926308078495;
y = 19;
}