import binascii

p_hex = 'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F'
p = int(p_hex, 16)
compressed_key_hex = '0250863AD64A87AE8A2FE83C1AF1A8403CB53F53E486D8511DAD8A04887E5B2352'
x_hex = compressed_key_hex[2:66]
x = int(x_hex, 16)
prefix = compressed_key_hex[0:2]

y_square = (pow(x, 3, p)  + 7) % p
y_square_square_root = pow(y_square, (p+1)/4, p)
if (prefix == "02" and y_square_square_root & 1) or (prefix == "03" and not y_square_square_root & 1):
    y = (-y_square_square_root) % p
else:
    y = y_square_square_root

computed_y_hex = format(y, '064x')
computed_uncompressed_key = "04" + x_hex + computed_y_hex

print computed_uncompressed_key

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

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

def pub2point(line, file):
    x = int(line[2:66], 16)
    if len(line) < 70:
        y = bit.format.x_to_y(x, int(line[:2], 16) % 2)
    else:
        y = int(line[66:], 16)
    return Point(x, y, curve=curve.secp256k1)
    if (y % 2 == 0):
        prefix = "02"
    else:
        prefix = "03"
        hx = hex(x)[2:].zfill(64)
        hy = hex(y)[2:].zfill(64)
        file.write(prefix+hx+"\n") # Writes compressed key to file    
     

    
with open("1.txt", "r") as f, open("output.txt", "w") as outf:
    line = f.readline().strip()
    while line != '':
          pub2point(line, outf)
          line = f.readline().strip()

with open("file1.txt", "r") as f:
    line = f.readline().strip()
    while line != '':
          hex1 = f.readline().strip()

with open("file2.txt", "r") as f:
    line = f.readline().strip()
    while line != '':
          hex2 = f.readline().strip()
    
    
def add(file1.txt, file2.txt):
    P = (hex1)
    Q = (hex2)
    R = hex(P - Q)
    hx = hex(R).zfill(64)
    print(hx)