I have a function which encrypts a string with AES using PyCrypto. When I call that function in my unit tests, everything works fine. On the production environment, it works fine as well. However, when the function is called on the GAE development server, an error is thrown: "ImportError: cannot import name blockalgo". I tested it on Windows 7 (64 bit) and Mac OS 10.5. Both resulted in the same error. I'm using Google App Engine with Python 2.7. What could be the problem?
app.yaml
application: xxx
version: 6
runtime: python27
api_version: 1
threadsafe: true
libraries:
- name: django
version: "1.2"
- name: webapp2
version: "2.3"
- name: jinja2
version: "2.6"
- name: pycrypto
version: "2.3"
- name: PIL
version: "1.1.7"
builtins:
- appstats: on
- remote_api: on
inbound_services:
- mail
- warmup
Encryption function:
def encrypt(plaintext):
from Crypto.Cipher import AES
import hashlib
password = 'xxx'
key = hashlib.sha256(password).digest()
mode = AES.MODE_ECB
encryptor = AES.new(key, mode)
BLOCK_SIZE = 16
PADDING = '{'
pad = lambda s: s + (BLOCK_SIZE - len(s) % BLOCK_SIZE) * PADDING
EncodeAES = lambda c, s: b58encode(c.encrypt(pad(s)))
encrypted = EncodeAES(encryptor, plaintext)
if len(encrypted) < 22:
for i in range (len(encrypted), 22):
encrypted += "_"
return encrypted
