Monthly Archives: January 2011

Accessing the ACE IMS via python

Using hashlib, and binascii we can use python to both generate a digest and grab an ace token for that digest.

While this example only sends one request in a call, you should batch your requests prior to requesting a token. Just send a ‘list’ of tokenRequest objects to requestTokensImmediate. The IMS will support up to 10,000 requests per call.

import hashlib
import binascii
from suds.client import Client

filename='test2.py'

digFile = open(filename,'rb')
hashAlg = hashlib.sha256()
hashAlg.update(digFile.read())
filedigest = binascii.b2a_hex(hashAlg.digest())

url='http://ims.umiacs.umd.edu:8080/ace-ims/IMSWebService?wsdl'
client = Client(url)

print  filename, ' ', filedigest

request = client.factory.create('tokenRequest')
request.hashValue = filedigest
request.name = filename

result = client.service.requestTokensImmediate('SHA-256-0',request)
print result

The result spits back a token that you can use to validate a file.

[python] [toaster@loach ace-cli]$ python test2.py
test2.py   164182eef9792e2e1c5005cd9240ff508aef042b8fa344597431eae39370c784
[(tokenResponse){
  digestService = "SHA-256"
  name = "test2.py"
  proofElements[] =
     (proofElement){
        hashes[] =
           "c5e82872eeee3dfa539202a9757f8a5364b6fded4dfcb40b66084158f2b5c627",
        index = 0
     },
     (proofElement){
        hashes[] =
           "6e16a71847403f4e586625463160993bfab189c0bba771d81354c03d9c3591fd",
        index = 0
     },
     (proofElement){
        hashes[] =
           "0879b385c366d07142446a18dfb6d19c468a733991e9685fc75ce6f4b929b659",
        index = 0
     },
     (proofElement){
        hashes[] =
           "e19dd18bd9eabf79a074d72231a7117bd2319a859d31a429575b4657e85d0c95",
        index = 1
     },
  roundId = 2893078
  statusCode = 100
  timestamp = 2011-01-07 13:08:27.000253
  tokenClassName = "SHA-256-0"
}]