Attempt to fix travis build (dashpay#66)

.travis.yml

@@ -1,5 +1,7 @@
 sudo: enabled
 language: cpp
+os: linux
+dist: trusty
 before_install:
   - sudo add-apt-repository -y ppa:deadsnakes/ppa
   - sudo apt-get update

python-bindings/README.md

@@ -175,3 +175,9 @@ prepend_agg = PrependSignature.aggregate([prepend1, prepend2])
 ok = prepend_agg.verify([Util.hash256(msg), Util.hash256(msg)], [pk1, pk2])
 
 ```
+
+#### Publishing the library
+```bash
+python3 setup.py sdist bdist_wheel
+twine upload  dist/*
+```

python-impl/fields.py

@@ -71,19 +71,10 @@ def __pow__(self, other):
             return Fq(self.Q, 1)
         elif other == 1:
             return self
-
-        el = self
-        multiply = []
-        while other > 1:
-            if other % 2 == 1:
-                multiply.append(el)
-            el = el * el
-            other = other // 2
-
-        for m in multiply:
-            el *= m
-
-        return el
+        elif other % 2 == 0:
+            return (self * self) ** (other // 2)
+        else:
+            return (self * self) ** (other // 2) * self
 
     def qi_power(self, i):
         return self

python-impl/tests.py

@@ -13,7 +13,7 @@
 from threshold import Threshold
 from util import hash256
 
-# setrecursionlimit(10**6)
+setrecursionlimit(10**6)
 
 
 def rand_scalar(ec=default_ec):
@@ -445,13 +445,13 @@ def test_threshold():
         test_threshold_instance(T, 5)
 
 
-# test_threshold()
+test_threshold()
 test_fields()
-# test_ec()
-# test_vectors()
-# test_vectors2()
-# test_vectors3()
-# test_vectors4()
+test_ec()
+test_vectors()
+test_vectors2()
+test_vectors3()
+test_vectors4()
 test1()
 test2()