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#!/usr/bin/env python
# under development
import requests
import json
import string
import random
import srp._pysrp as srp
import binascii
safe_unhexlify = lambda x: binascii.unhexlify(x) if (len(x) % 2 == 0) else binascii.unhexlify('0'+x)
# let's have some random name
def id_generator(size=6, chars=string.ascii_uppercase + string.digits):
return ''.join(random.choice(chars) for x in range(size))
# using globals for a start
server = 'http://api.lvh.me:3000/1'
login = id_generator()
password = id_generator() + id_generator()
# print ' username = "' + login + '"'
# print ' password = "' + password + '"'
# log the server communication
def print_and_parse(response):
# print response.request.method + ': ' + response.url
# print " " + json.dumps(response.request.data)
# print " -> " + response.text
return json.loads(response.text)
def signup(session):
salt, vkey = srp.create_salted_verification_key( login, password, srp.SHA256, srp.NG_1024 )
# print ' salt = "' + binascii.hexlify(salt) + '"'
# print ' v = "' + binascii.hexlify(vkey) + '"'
user_params = {
'user[login]': login,
'user[password_verifier]': binascii.hexlify(vkey),
'user[password_salt]': binascii.hexlify(salt)
}
return session.post(server + '/users.json', data = user_params)
usr = srp.User( login, password, srp.SHA256, srp.NG_1024 )
def authenticate(session, login):
uname, A = usr.start_authentication()
# print ' aa = "' + binascii.hexlify(A) + '"'
params = {
'login': uname,
'A': binascii.hexlify(A)
}
init = print_and_parse(session.post(server + '/sessions', data = params))
# print ' b = "' + init['b'] + '"'
# print ' bb = "' + init['B'] + '"'
M = usr.process_challenge( safe_unhexlify(init['salt']), safe_unhexlify(init['B']) )
# print ' m = "' + binascii.hexlify(M) + '"'
return session.put(server + '/sessions/' + login,
data = {'client_auth': binascii.hexlify(M)})
session = requests.session()
user = print_and_parse(signup(session))
# SRP signup would happen here and calculate M hex
auth = print_and_parse(authenticate(session, user['login']))
if ( 'errors' in auth ):
print ' u = "%x"' % usr.u
print ' x = "%x"' % usr.x
print ' v = "%x"' % usr.v
print ' S = "%x"' % usr.S
print ' K = "' + binascii.hexlify(usr.K) + '"'
print ' M = "%x"' % usr.M
else:
usr.verify_session( safe_unhexlify(auth["M2"]) )
# At this point the authentication process is complete.
assert usr.authenticated()
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