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## www.pubnub.com - PubNub Real-time push service in the cloud.
# coding=utf8
## PubNub Real-time Push APIs and Notifications Framework
## Copyright (c) 2010 Stephen Blum
## http://www.pubnub.com/
## -----------------------------------
## PubNub 3.3.2 Real-time Push Cloud API
## -----------------------------------
from Crypto.Cipher import AES
from Crypto.Hash import MD5
from base64 import encodestring, decodestring
import hashlib
import hmac
class PubnubCrypto() :
"""
#**
#* PubnubCrypto
#*
#**
## Initiate Class
pc = PubnubCrypto
"""
def pad( self, msg, block_size=16 ):
"""
#**
#* pad
#*
#* pad the text to be encrypted
#* appends a padding character to the end of the String
#* until the string has block_size length
#* @return msg with padding.
#**
"""
padding = block_size - (len(msg) % block_size)
return msg + chr(padding)*padding
def depad( self, msg ):
"""
#**
#* depad
#*
#* depad the decryptet message"
#* @return msg without padding.
#**
"""
return msg[0:-ord(msg[-1])]
def getSecret( self, key ):
"""
#**
#* getSecret
#*
#* hases the key to MD5
#* @return key in MD5 format
#**
"""
return hashlib.sha256(key).hexdigest()
def encrypt( self, key, msg ):
"""
#**
#* encrypt
#*
#* encrypts the message
#* @return message in encrypted format
#**
"""
secret = self.getSecret(key)
Initial16bytes='0123456789012345'
cipher = AES.new(secret[0:32],AES.MODE_CBC,Initial16bytes)
enc = encodestring(cipher.encrypt(self.pad(msg)))
return enc
def decrypt( self, key, msg ):
"""
#**
#* decrypt
#*
#* decrypts the message
#* @return message in decryped format
#**
"""
secret = self.getSecret(key)
Initial16bytes='0123456789012345'
cipher = AES.new(secret[0:32],AES.MODE_CBC,Initial16bytes)
return self.depad((cipher.decrypt(decodestring(msg))))
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