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darkfi/script/research/zk/ecip/example-construct-2.sage

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load("div.sage")
# Initialize an elliptic curve
p = 115792089237316195423570985008687907853269984665640564039457584007908834671663
r = 115792089237316195423570985008687907852837564279074904382605163141518161494337
Fp = GF(p) # Base Field
Fr = GF(r) # Scalar Field
A = 0
B = 7
E = EllipticCurve(GF(p), [A, B])
assert(E.cardinality() == r)
K.<x> = PolynomialRing(Fp, implementation="generic")
L.<y> = PolynomialRing(K, implementation="generic")
M.<z> = L[]
eqn = y^2 - x^3 - A * x - B
P1 = LabelPoint(E.random_element(), {"P₁": 1})
P2 = LabelPoint(E.random_element(), {"P₂": 1})
P3 = LabelPoint(E.random_element(), {"P₃": 1})
P4 = LabelPoint(E.random_element(), {"P₄": 1})
Q = -(P1.P + P2.P + P3.P + P4.P)
Q = LabelPoint(Q, {"Q": 1})
assert P1.P + P2.P + P3.P + P4.P + Q.P == E(0)
# Challenge line
A0 = LabelPoint(E.random_element(), {"A₀": 1})
A1 = LabelPoint(E.random_element(), {"A₁": 1})
X1 = div_line(A0, A1)
# First loop in construct
L1 = div_line(P1, P2)
Q1 = P1 + P2
L2 = div_line(P3, P4)
Q2 = P3 + P4
L3 = div_line(Q, -Q)
Q3 = Q
#print(f"L₁ = {L1}")
#print(f"L₂ = {L2}")
#print(f"L₃ = {L3}")
divs = [L1, L2, L3]
# Now apply reduction algo
# len(divs) == 3
D1 = L1
Q1 = Q1
# i = 0
= div_line(Q2, Q3)
D2 = + L2 + L3 - div_line(Q2, -Q2) - div_line(Q3, -Q3)
Q2 = Q2 + Q3
divs = [D1, D2]
# len(divs) == 2
= div_line(Q1, Q2)
D1 = + D1 + D2 - div_line(Q1, -Q1) - div_line(Q2, -Q2)
Q1 = Q1 + Q2
divs = [D1]
D = D1
assert D.is_equiv({
"P₁": 1,
"P₂": 1,
"P₃": 1,
"P₄": 1,
"Q": 1,
"": -5
})
assert X1.eval(D) == (-1)^D.effective_degree() * D.eval(X1)
# We should get the same result here:
load("construct.sage")
points = [P1, P2, P3, P4, Q]
D = construct(points)
print(f"D = {D}")