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fix #4717

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SomberNight 2018-09-14 16:12:47 +02:00
parent f05f3b430a
commit d1f11f5fe9
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1 changed files with 10 additions and 10 deletions
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20
electrum/ecc.py
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@ -38,6 +38,7 @@ from ecdsa.util import string_to_number, number_to_string
from .util import bfh, bh2u, assert_bytes, print_error, to_bytes, InvalidPassword, profiler
from .crypto import (Hash, aes_encrypt_with_iv, aes_decrypt_with_iv, hmac_oneshot)
from .ecc_fast import do_monkey_patching_of_python_ecdsa_internals_with_libsecp256k1
from . import msqr
do_monkey_patching_of_python_ecdsa_internals_with_libsecp256k1()
@ -94,20 +95,19 @@ def point_to_ser(P, compressed=True) -> bytes:
return bfh('04'+('%064x' % x)+('%064x' % y))
def get_y_coord_from_x(x, odd=True):
def get_y_coord_from_x(x: int, odd: bool=True) -> int:
curve = curve_secp256k1
_p = curve.p()
_a = curve.a()
_b = curve.b()
for offset in range(128):
Mx = x + offset
My2 = pow(Mx, 3, _p) + _a * pow(Mx, 2, _p) + _b % _p
My = pow(My2, (_p + 1) // 4, _p)
if curve.contains_point(Mx, My):
if odd == bool(My & 1):
return My
return _p - My
raise Exception('ECC_YfromX: No Y found')
x = x % _p
y2 = (pow(x, 3, _p) + _a * x + _b) % _p
y = msqr.modular_sqrt(y2, _p)
if curve.contains_point(x, y):
if odd == bool(y & 1):
return y
return _p - y
raise InvalidECPointException()
def ser_to_point(ser: bytes) -> (int, int):