def veritfyANumber(numeric_to_verify, sign_r, sign_s, sender_ecc_pubkey):
return ecdsa.verify(numeric_to_verify, (sign_r, sign_s), sender_ecc_pubkey)
def verify(self, data, sig, hashfunc='sha256'):
'''Verify the signature of data using the specified hash function'''
h = dec_long(hashlib.new(hashfunc, data).digest())
s = dec_point(sig)
return ecdsa.verify(h, s, self._pub)
M2 = 'helloB' + ',' + str(PKbx) + ',' + str(PKby)
connection.send(M2.encode())
# 4. B side: 1) receive M3 from A 2) verify ecdsa signature sa 3) compute ecdsa signature sb 4)send M4
# 4.1) receive M3=sa from A
M3 = connection.recv(1024).decode()
sa_0 = M3.split(',')[0]
sa_1 = M3.split(',')[1]
sa = (int(sa_0), int(sa_1))
# 4.2) verify sa
hstringa = helloA + str(PKax) + str(PKay)
md5a = md5()
md5a.update(hstringa.encode())
ha = md5a.hexdigest()[8:-8]
ha = int(ha, 16)
if verify(ha, sa, (256, (int(PKax), int(PKay)))) == True:
Kb = mul(c_p, c_q, c_n, PKa, SKb)
# 4.3) compute sb
hstringb = 'helloB' + str(PKbx) + str(PKby)
md5b = md5()
md5b.update(hstringb.encode())
hb = md5b.hexdigest()[8:-8]
hb = int(hb, 16)
sb = sign(hb, (256, int(SKb)))
# 4.4) send M4
M4 = str(sb[0]) + ',' + str(sb[1])
connection.send(M4.encode())
print('signature of client is valid')
print('the shared secrety is', Kb)
else:
print('signature of client is invalid, protocol fails')
from ecc import ecdsa, Key ECC_keylen = 192 ecc_key = Key.Key.generate(ECC_keylen) ecc_pubkey = ecc_key._pub print ecc_pubkey print type(ecc_pubkey) ecc_privkey = ecc_key._priv print ecc_privkey numeric_to_sign = 0x882da7b sign_r, sign_s = ecdsa.sign(numeric_to_sign, ecc_privkey) print sign_r, sign_s res = ecdsa.verify(numeric_to_sign, (sign_r, sign_s), ecc_pubkey) print res