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Add sage script for generating scalar_split_lambda constants #852

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7 changes: 1 addition & 6 deletions sage/gen_exhaustive_groups.sage
Original file line number Diff line number Diff line change
@@ -1,9 +1,4 @@
# Define field size and field
P = 2^256 - 2^32 - 977
F = GF(P)
BETA = F(0x7ae96a2b657c07106e64479eac3434e99cf0497512f58995c1396c28719501ee)

assert(BETA != F(1) and BETA^3 == F(1))
load("secp256k1_params.sage")

orders_done = set()
results = {}
Expand Down
114 changes: 114 additions & 0 deletions sage/gen_split_lambda_constants.sage
Original file line number Diff line number Diff line change
@@ -0,0 +1,114 @@
""" Generates the constants used in secp256k1_scalar_split_lambda.

See the comments for secp256k1_scalar_split_lambda in src/scalar_impl.h for detailed explanations.
"""

load("secp256k1_params.sage")

def inf_norm(v):
"""Returns the infinity norm of a vector."""
return max(map(abs, v))

def gauss_reduction(i1, i2):
v1, v2 = i1.copy(), i2.copy()
while True:
if inf_norm(v2) < inf_norm(v1):
v1, v2 = v2, v1
# This is essentially
# m = round((v1[0]*v2[0] + v1[1]*v2[1]) / (inf_norm(v1)**2))
# (rounding to the nearest integer) without relying on floating point arithmetic.
m = ((v1[0]*v2[0] + v1[1]*v2[1]) + (inf_norm(v1)**2) // 2) // (inf_norm(v1)**2)
if m == 0:
return v1, v2
v2[0] -= m*v1[0]
v2[1] -= m*v1[1]

def find_split_constants_gauss():
"""Find constants for secp256k1_scalar_split_lamdba using gauss reduction."""
(v11, v12), (v21, v22) = gauss_reduction([0, N], [1, int(LAMBDA)])

# We use related vectors in secp256k1_scalar_split_lambda.
A1, B1 = -v21, -v11
A2, B2 = v22, -v21

return A1, B1, A2, B2

def find_split_constants_explicit_tof():
"""Find constants for secp256k1_scalar_split_lamdba using the trace of Frobenius.

See Benjamin Smith: "Easy scalar decompositions for efficient scalar multiplication on
elliptic curves and genus 2 Jacobians" (https://eprint.iacr.org/2013/672), Example 2
"""
assert P % 3 == 1 # The paper says P % 3 == 2 but that appears to be a mistake, see [10].
assert C.j_invariant() == 0

t = C.trace_of_frobenius()

c = Integer(sqrt((4*P - t**2)/3))
A1 = Integer((t - c)/2 - 1)
B1 = c

A2 = Integer((t + c)/2 - 1)
B2 = Integer(1 - (t - c)/2)

# We use a negated b values in secp256k1_scalar_split_lambda.
B1, B2 = -B1, -B2

return A1, B1, A2, B2

A1, B1, A2, B2 = find_split_constants_explicit_tof()

# For extra fun, use an independent method to recompute the constants.
assert (A1, B1, A2, B2) == find_split_constants_gauss()

# PHI : Z[l] -> Z_n where phi(a + b*l) == a + b*lambda mod n.
def PHI(a,b):
return Z(a + LAMBDA*b)

# Check that (A1, B1) and (A2, B2) are in the kernel of PHI.
assert PHI(A1, B1) == Z(0)
assert PHI(A2, B2) == Z(0)

# Check that the parallelogram generated by (A1, A2) and (B1, B2)
# is a fundamental domain by containing exactly N points.
# Since the LHS is the determinant and N != 0, this also checks that
# (A1, A2) and (B1, B2) are linearly independent. By the previous
# assertions, (A1, A2) and (B1, B2) are a basis of the kernel.
assert A1*B2 - B1*A2 == N

# Check that their components are short enough.
assert (A1 + A2)/2 < sqrt(N)
assert B1 < sqrt(N)
assert B2 < sqrt(N)

G1 = round((2**384)*B2/N)
G2 = round((2**384)*(-B1)/N)

def rnddiv2(v):
if v & 1:
v += 1
return v >> 1

def scalar_lambda_split(k):
"""Equivalent to secp256k1_scalar_lambda_split()."""
c1 = rnddiv2((k * G1) >> 383)
c2 = rnddiv2((k * G2) >> 383)
c1 = (c1 * -B1) % N
c2 = (c2 * -B2) % N
r2 = (c1 + c2) % N
r1 = (k + r2 * -LAMBDA) % N
return (r1, r2)

# The result of scalar_lambda_split can depend on the representation of k (mod n).
SPECIAL = (2**383) // G2 + 1
assert scalar_lambda_split(SPECIAL) != scalar_lambda_split(SPECIAL + N)

print(' A1 =', hex(A1))
print(' -B1 =', hex(-B1))
print(' A2 =', hex(A2))
print(' -B2 =', hex(-B2))
print(' =', hex(Z(-B2)))
print(' -LAMBDA =', hex(-LAMBDA))

print(' G1 =', hex(G1))
print(' G2 =', hex(G2))
File renamed without changes.
36 changes: 36 additions & 0 deletions sage/secp256k1_params.sage
Original file line number Diff line number Diff line change
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"""Prime order of finite field underlying secp256k1 (2^256 - 2^32 - 977)"""
P = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F

"""Finite field underlying secp256k1"""
F = FiniteField(P)

"""Elliptic curve secp256k1: y^2 = x^3 + 7"""
C = EllipticCurve([F(0), F(7)])

"""Base point of secp256k1"""
G = C.lift_x(0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798)

"""Prime order of secp256k1"""
N = C.order()

"""Finite field of scalars of secp256k1"""
Z = FiniteField(N)

""" Beta value of secp256k1 non-trivial endomorphism: lambda * (x, y) = (beta * x, y)"""
BETA = F(2)^((P-1)/3)

""" Lambda value of secp256k1 non-trivial endomorphism: lambda * (x, y) = (beta * x, y)"""
LAMBDA = Z(3)^((N-1)/3)

assert is_prime(P)
assert is_prime(N)

assert BETA != F(1)
assert BETA^3 == F(1)
assert BETA^2 + BETA + 1 == 0

assert LAMBDA != Z(1)
assert LAMBDA^3 == Z(1)
assert LAMBDA^2 + LAMBDA + 1 == 0

assert Integer(LAMBDA)*G == C(BETA*G[0], G[1])