Quote from: ajeev on Today at 12:52:58 PM

from fastecdsa import curve
from fastecdsa.point import Point
import bit

G = curve.secp256k1.G
N = curve.secp256k1.q
DIV = '02AE3482B19E840288CC9B302AD9F5DC017AB796D3690CC8029017A8AF3503BE8E'
pubkey = '03ec0f4d728d248698a59d3a50a0469da06fdb8019700dfc5de9eae2dd93fc2bc8'

def pub2point(pub_hex):
x = int(pub_hex[2:66], 16)
if len(pub_hex) < 70:
y = bit.format.x_to_y(x, int(pub_hex[:2], 16) % 2)
else:
y = int(pub_hex[66:], 16)
return Point(x, y, curve=curve.secp256k1)

Q = pub2point(pubkey)
R = pub2point(DIV)
z= Q / R

print(z)

-----------------------------------------
>>> z= Q / R
TypeError: unsupported operand type(s) for /: 'Point' and 'Point'

CAN ANYONE HELP,HOW TO CORRECT THIS

THANKS

You can't divide a point by a point. A point can only be multiplied by a number. In this case we are multiplying by an inverse number, thus imitating the division of a point by a number.

Code:

from fastecdsa import curve
from fastecdsa.point import Point
import bit

G = curve.secp256k1.G
N = curve.secp256k1.q

def pub2point(pub_hex):
x = int(pub_hex[2:66], 16)
if len(pub_hex) < 70:
y = bit.format.x_to_y(x, int(pub_hex[:2], 16) % 2)
else:
y = int(pub_hex[66:], 16)
return Point(x, y, curve=curve.secp256k1)

DIV = 123456789
d = pow(DIV, N - 2, N)

pubkey = '03ec0f4d728d248698a59d3a50a0469da06fdb8019700dfc5de9eae2dd93fc2bc8'
Q = pub2point(pubkey)
z = Q * d

print(z)