def query(password, w, t, server=defaultServer, previousPubkey=None):
"""
Queries the a Pythia PRF service and verifies the server's ZKP.
@returns (z,p) where: @z is the encrypted password and @p is the
server's pubkey bound to clientId
Raises an exception if there are any problems interacting with the service
or if the server's ZKP fails verification.
"""
# Blind the password
r, x = vpop.blind(password)
xSerialized = vpop.wrap(x)
# Query the service via HTTP(S) GET
response = fetch(queryUrlTemplate.format(server, w, t, xSerialized))
# Grab the required fields from the response.
p, y, c, u = extract(response, ["p", "y", "c", "u"])
# Check the pubkey
if previousPubkey and previousPubkey != p:
print "previous: " + previousPubkey
print "p: " + p
raise Exception(
"Server-provided pubkey doesn't match previous pubkey.")
# Deserialize the response fields
p, y, c, u = (vpop.unwrapP(p), vpop.unwrapY(y), vpop.unwrapC(c),
vpop.unwrapU(u))
pi = (p, c, u)
# Verify the result by checking the proof
vpop.verify(x, t, y, pi)
# Deblind the result
z = vpop.deblind(r, y)
# Return the important fields in serialied form
z, p = vpop.wrap(z), vpop.wrap(p)
return z, p
def query(password, w, t, server=defaultServer, previousPubkey=None):
"""
Queries the a Pythia PRF service and verifies the server's ZKP.
@returns (z,p) where: @z is the encrypted password and @p is the
server's pubkey bound to clientId
Raises an exception if there are any problems interacting with the service
or if the server's ZKP fails verification.
"""
# Blind the password
r,x = vpop.blind(password)
xSerialized = vpop.wrap(x)
# Query the service via HTTP(S) GET
response = fetch(queryUrlTemplate.format(server,w,t,xSerialized))
# Grab the required fields from the response.
p,y,c,u = extract(response, ["p","y","c","u"])
# Check the pubkey
if previousPubkey and previousPubkey != p:
print "previous: " + previousPubkey
print "p: "+ p
raise Exception("Server-provided pubkey doesn't match previous pubkey.")
# Deserialize the response fields
p,y,c,u = (vpop.unwrapP(p), vpop.unwrapY(y),
vpop.unwrapC(c), vpop.unwrapU(u))
pi = (p,c,u)
# Verify the result by checking the proof
vpop.verify(x, t, y, pi)
# Deblind the result
z = vpop.deblind(r,y)
# Return the important fields in serialied form
z,p = vpop.wrap(z), vpop.wrap(p)
return z,p
def testProof(self):
"""
Ensures the proof is valid.
"""
# Make an eval request
r,x = vpop.blind(pw)
xWrap = vpop.wrap(x)
url = VpopEvalTest.urlTemplate.format(w,t,xWrap)
r = self.parseResponse(self.client.get(url))
# Deserialize the items needed to verify the proof.
y = vpop.unwrapY(r["y"])
pi = (vpop.unwrapP(r["p"]), vpop.unwrapC(r["c"]), vpop.unwrapU(r["u"]) )
# Test the proof
self.assertTrue( vpop.verify(x, t, y, pi) )
