code: def DecryptPassword(cipher, key):
  		
  		import base64
  		import hmac
  		import sha
  		from array import array
  
  		H = UcsUtils.GetShaHash
  
  		cipher = cipher + "\n"
  		cipher = base64.decodestring(cipher)
  		n = len(cipher) - 16 - 8
  
  		uhash = cipher[:16]
  		passwordStream = cipher[16:-8] + "0000"[n & 3:]
  		auth = cipher[-8:]
  
  		k_enc, k_auth = H('enc' + key + uhash), H('auth' + key + uhash)
  		vauth = hmac.new(cipher[-8:], k_auth, sha).digest()[:8]
  
  		passwordStream = array('L', passwordStream)
  		xkey = UcsUtils.Expandkey(k_enc, n + 4)
  
  		for i in xrange(len(passwordStream)):
  			passwordStream[i] = passwordStream[i] ^ xkey[i]
  
  		decryptedPassword = passwordStream.tostring()[:n]
  		return decryptedPassword
docs: Decrypts the password using the given key with which the password was encrypted first.