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"""Encryption module that uses pycryptopp or pycrypto"""
try:
# Pycryptopp is preferred over Crypto because Crypto has had
# various periods of not being maintained, and pycryptopp uses
# the Crypto++ library which is generally considered the 'gold standard'
# of crypto implementations
from pycryptopp.cipher import aes
def aesEncrypt(data, key):
cipher = aes.AES(key)
return cipher.process(data)
# magic.
aesDecrypt = aesEncrypt
except ImportError:
from Crypto.Cipher import AES
from Crypto.Util import Counter
def aesEncrypt(data, key):
cipher = AES.new(key, AES.MODE_CTR,
counter=Counter.new(128, initial_value=0))
return cipher.encrypt(data)
def aesDecrypt(data, key):
cipher = AES.new(key, AES.MODE_CTR,
counter=Counter.new(128, initial_value=0))
return cipher.decrypt(data)
has_aes = True
def getKeyLength():
return 32