def _sign_loop(self, r, s, h, k, priv):
while r == 0 or s == 0:
if k is None:
k = (getrandbits(self.bits) % (self.N - 1)) + 1
kinv = inv(k, self.N)
kg = mulp(self.a, self.b, self.p, self.G, k)
r = kg[0] % self.N
if r == 0:
continue
s = (kinv * (h + r * priv)) % self.N
return r, s
def sign(self, h, priv, k=None):
while h > self.N:
h >>= 1
r = s = 0
while r == 0 or s == 0:
if k is None:
k = (getrandbits(self.bits) % (self.N - 1)) + 1
kinv = inv(k, self.N)
kg = mulp(self.a, self.b, self.p, self.G, k)
r = kg[0] % self.N
if r == 0:
continue
s = (kinv * (h + r * priv)) % self.N
return self.int2bytes(r) + self.int2bytes(s)
def sign(self, h, priv, k=None):
while h > self.N:
h >>= 1
r = s = 0
while r == 0 or s == 0:
if k is None:
k = (getrandbits(self.bits) % (self.N - 1)) + 1
kinv = inv(k, self.N)
kg = mulp(self.a, self.b, self.p, self.G, k)
r = kg[0] % self.N
if r == 0:
continue
s = (kinv * (h + r * priv)) % self.N
return self.int2bytes(r) + self.int2bytes(s)
def dh_z(self, priv, pub):
return self.int2bytes(mulp(self.a, self.b, self.p, pub, priv)[0])
def public_key_for(self, priv):
return mulp(self.a, self.b, self.p, self.G, priv)
def key_pair(self):
priv = (getrandbits(self.bits) % (self.N - 1)) + 1
pub = mulp(self.a, self.b, self.p, self.G, priv)
return priv, pub
