def test2():
client = UdpEndPoint()
p = UdpEndPoint()
group_object = PairingGroup('SS512')
key_client = group_object.random(GT)
key_p = group_object.random(GT)
nonce = OpenSSLRand().getRandomBits(128)
server_crypter_a = SymmetricCryptoAbstraction(extractor(key_client))
server_crypter_b = SymmetricCryptoAbstraction(extractor(key_p))
c_package_a = test1(client, p, nonce,
objectToBytes(key_client, group_object),
objectToBytes(key_p, group_object))
print('===========================================================')
print(c_package_a)
key_package_a = server_crypter_a.decrypt(c_package_a)
key_package_a = bytesToObject(key_package_a, group_object)
key_package_b = server_crypter_b.decrypt(key_package_a[3])
key_package_b = bytesToObject(key_package_b, group_object)
print('===========================================================')
i = 1
for thing in key_package_a:
print(str(i) + '.', thing)
i += 1
print('===========================================================')
j = 1
for thing in key_package_b:
print(str(j) + '.', thing)
j += 1
print('===========================================================')
def deserialize(storage): storage['n'] = storage['n'] storage['master_public_key'] = bytesToObject(storage['master_public_key'], group) storage['master_key'] = bytesToObject(storage['master_key'], group) storage['plain'] = bytesToObject(storage['plain'], group) storage['cipher'] = bytesToObject(storage['cipher'], group) return storage
def deserialize(storage):
storage['n'] = storage['n']
storage['master_public_key'] = bytesToObject(storage['master_public_key'],
group)
storage['master_key'] = bytesToObject(storage['master_key'], group)
storage['plain'] = bytesToObject(storage['plain'], group)
storage['cipher'] = bytesToObject(storage['cipher'], group)
return storage
def resetKeys(self, keyMap): ''' Reset the master/public keys for all of the ciphers that are being used by the system right now. ''' self.master = bytesToObject(keyMap['mk'], self.groupObj) self.public = bytesToObject(keyMap['pk'], self.groupObj) for c in self.cipherQueue: c.setKeys(self.master, self.public)
def __init__(self, uid):
self.group = GROUP
self.gs_protocol = eval(GS_PROTOCOL)(self.group)
self.path = f'parameters/{GS_PROTOCOL.lower()}'
gpk_path = os.path.join(self.path, 'public/gpk')
self.gpk = bytesToObject(open(gpk_path, 'rb').read(), self.group)
sk_path = os.path.join(self.path, f'users/{uid:02d}/sk')
self.sk = bytesToObject(open(sk_path, 'rb').read(), self.group)
def enrollment(self, pw):
response = self._requestobj.get("%s/enroll" % self._endpoint, verify = False)
document = response.json()
c0 = bytesToObject(document["c0"], group)
c1 = bytesToObject(document["c1"], group)
ns = bytesToObject(document["ns"], group)
proof = bytesToObject(document["proof"], group)
return self._client.do_enrollment(pw, ns, (c0,c1), proof)
def tally_vote():
#initialization
group = RSAGroup()
pai = pkenc_paillier99.Pai99(group)
#get voting public key
f=open('./pyssss/VotingPublic','rb')
data = f.read()
public_key = bytesToObject(data,group)
n=public_key['n']
#get voting private key
f=open('./pyssss/VotingPrivate','rb')
data = f.read()
secret_key = bytesToObject(data,group)
#get ciphervotes file
f=open('./CipherVotes','r')
data=f.readlines()
count = 0
#open file for publishing results
f=open('./PublishedResults','w')
#go through all recorded ciphervotes
print '#, ciphervote, plainvote'
for vote in data:
serializedVote = vote.strip()
ciphervote = specialInt.deserialize(serializedVote)
ciphervote = Ciphertext({'c':ciphervote},public_key,'c')
if count == 0:
ciphertotal = ciphervote
else:
ciphertotal=ciphertotal+ciphervote
#publish
print str(count)+','+str(ciphervote['c'])+','+ str(pai.decrypt(public_key,secret_key,ciphervote))
f.write(str(count)+','+str(ciphervote['c'])+','+ str(pai.decrypt(public_key,secret_key,ciphervote))+'\n' )
count = count +1
print 'Our calculated total:', pai.decrypt(public_key,secret_key,ciphertotal)
#get ciphervotes file
f=open('./CipherVotesTotal','r')
data=f.read()
data=data.strip()
ciphervotetotal = specialInt.deserialize(data)
ciphervotetotal = Ciphertext({'c':ciphervotetotal},public_key,'c')
ciphervotetotal = pai.decrypt(public_key,secret_key,ciphervotetotal)
print 'Their calculated total:',ciphervotetotal
return
def verify(self, msg, signature, time_period, rl):
signature = bytesToObject(signature, self.group)
rl = [bytesToObject(rt, self.group) for rt in rl]
if GS_PROTOCOL == 'ShortSig':
return self.is_valid(msg) and \
self.gs_protocol.verify(self.gpk, msg, signature)
elif GS_PROTOCOL == 'VLRSig':
return self.is_valid(msg) and \
self.gs_protocol.verify(self.gpk, msg, signature, time_period, rl)
def policy(request, p_id):
user = Policy.objects.get(pk=int(p_id))
appname = "privateBook"
statuses_decrypted = []
if request.method == 'POST':
content = request.POST.get('status', False)
if content:
try:
auth = Authority.objects.get(app_name=appname)
except ObjectDoesNotExist:
auth = False
if auth:
private = bytesToObject(auth.p_key, groupObj)
decoder = bytesToObject(auth.d_key, groupObj)
encrypt = hyb_abe.encrypt(private, str(content), str(user.policy))
print "-----------------------------------------------------"
print "The status update is:"
print content
print "-----------------------------------------------------"
print "Encrypted data, E is:"
print encrypt
print "--------------------------"
print "And it is stored as:"
print objectToBytes(encrypt, groupObj)
print "-----------------------------------------------------"
print "The decryption key is:"
print decoder
encrypt_b = objectToBytes(encrypt, groupObj)
p = PostedData(p_id=int(p_id), status=encrypt_b)
p.save()
else:
return render(request, 'policy.html', {'msg': 'The authority has not created any keys for you to encrypt your data!', 'id': p_id, 'name': user.name})
return HttpResponseRedirect('')
else:
return render(request, 'policy.html', {'msg': 'You didn\'t enter a status. Please try again.', 'id': p_id, 'name': user.name})
try:
auth = Authority.objects.get(app_name=appname)
except ObjectDoesNotExist:
auth = False
if auth:
statuses = PostedData.objects.filter(p_id=int(p_id))
for s in statuses:
status_cipher = bytesToObject(s.status, groupObj)
private = bytesToObject(auth.p_key, groupObj)
decoder = bytesToObject(auth.d_key, groupObj)
try:
status_pair = (hyb_abe.decrypt(private, decoder, status_cipher), s.posted)
except:
status_pair = ("Your status could not be displayed: this service does not support your privacy policy!", s.posted)
statuses_decrypted.append(status_pair)
if statuses_decrypted:
context = {'statuses': statuses_decrypted, 'id': p_id, 'name': user.name}
else:
context = {'id': p_id, 'name': user.name}
return render(request, 'policy.html', context)
def decrypt_seed_key_len(enc_seed_key_len=None, pk_file=None, sk_file=None, debug=0):
"""
Decrypt encrypted seed, symmetric key and re-encryption length with ABE using the given public and secret key.
:param enc_seed_key: encrypted seed, symmetric key and re-encryption length to decrypt
:param pk_file: ABE public key
:param sk_file: ABE secret key
:param debug: if 1, prints will be shown during execution; default 0, no prints are shown
:return: decrypted seed, symmetric key and number of re-encryption length
"""
import logging
import os.path
# Check if enc_seed_key is set
if enc_seed_key_len is None:
logging.error('decrypt_seed_key ciphertext exception')
if debug: # ONLY USE FOR DEBUG
print('EXCEPTION in decrypt_seed_key ciphertext')
raise Exception
# Check if pk_file is set and it exists
if pk_file is None or not os.path.isfile(pk_file):
logging.error('[ERROR] decrypt_seed_key pk_file exception')
if debug: # ONLY USE FOR DEBUG
print('EXCEPTION in decrypt_seed_key pk_file')
raise Exception
# Check if sk_file is set and it exists
if sk_file is None or not os.path.isfile(sk_file):
logging.error('decrypt_seed_key sk_file exception')
if debug: # ONLY USE FOR DEBUG
print('EXCEPTION in decrypt_seed_key sk_file')
raise Exception
# Decrypt data with ABE
pairing_group = pg.pairing_group_create('MNT224')
with open(pk_file, 'rb') as f:
pk = bytesToObject(f.read(), pairing_group)
with open(sk_file, 'rb') as f:
sk = bytesToObject(f.read(), pairing_group)
# cpabe = AC17CPABE(pairing_group, 2)
cpabe = CPabe_BSW07(pairing_group)
enc_data = cpabe.decrypt(pk, sk, enc_seed_key_len)
from re_enc_engine.const import H, SYM_KEY_DEFAULT_SIZE, SEED_LENGTH
import struct
# Retrieve params from decryption output file
seed, key, re_enc_length = struct.unpack('%ds%dsH' % (SEED_LENGTH, SYM_KEY_DEFAULT_SIZE), enc_data)
if debug: # ONLY USE FOR DEBUG
print('DECRYPTED SEED = (%d) %s' % (len(seed), seed))
print('DECRYPTED KEY = (%d) %s' % (len(key), key))
print('DECRYPTED RE_ENC_LENGTH = %d' % re_enc_length)
return seed, key, re_enc_length
def __init__(self):
self.group = PairingGroup('MNT224')
self.gs_protocol = eval(GS_PROTOCOL)(self.group)
self.path = f'parameters/{GS_PROTOCOL.lower()}'
gpk_path = os.path.join(self.path, 'public/gpk')
self.gpk = bytesToObject(open(gpk_path, 'rb').read(), self.group)
gmsk_path = os.path.join(self.path, 'gm/gmsk')
self.gmsk = bytesToObject(open(gmsk_path, 'rb').read(), self.group)
dic_path = os.path.join(self.path, 'gm/identity.pkl')
self.dic = pickle.load(open(dic_path, 'rb'))
def deserialize(storage):
kac = KAC()
kac.n = storage['n']
storage['param'] = bytesToObject(storage['param'], group)
storage['e_g1_g2'] = bytesToObject(storage['e_g1_g2'], group)
kac.e_g1_g2 = storage['e_g1_g2']
storage['key'] = bytesToObject(storage['key'], group)
storage['plain'] = bytesToObject(storage['plain'], group)
storage['cipher'] = bytesToObject(storage['cipher'], group)
return storage
def augment_search(n, predicate_scheme, group_name, matrix_str, generator_bytes, token_bytes, pp,
start_index, end_index):
prox_scheme = ProximitySearch(n + 1, predicate_scheme, group_name)
prox_scheme.deserialize_key(matrix_str, generator_bytes)
prox_scheme.public_parameters = pp
with open("ciphertexts_" + str(start_index) + "_" + str(end_index), "rb") as enc_file:
prox_scheme.enc_data = bytesToObject(enc_file.read(), prox_scheme.predinstance.group)
enc_file.close()
token = bytesToObject(token_bytes, prox_scheme.predinstance.group)
indices = prox_scheme.search(token)
return [x+start_index for x in indices]
def deserialize(storage): kac = KAC() kac.n = storage['n'] storage['param'] = bytesToObject(storage['param'], kac.group) storage['e_g1_g2'] = bytesToObject(storage['e_g1_g2'], kac.group) kac.e_g1_g2 = storage['e_g1_g2'] storage['key'] = bytesToObject(storage['key'], kac.group) storage['plain'] = bytesToObject(storage['plain'], kac.group) storage['cipher'] = bytesToObject(storage['cipher'], kac.group) return storage
def connect(server, port):
try :
server.connect((host, port))
policy = server.recv(4096)
print('Received room policy from server: {}'.format(policy))
pk = bytesToObject(server.recv(4096), groupObj)
cpkey = bytesToObject(server.recv(4096), groupObj)
print('Key attributes: {}'.format(cpkey['attributes']))
return pk, cpkey, policy
except :
print 'Unable to connect'
sys.exit()
def receiveEncapsulations() :
#sys.stdout.write("\n\nReceived encapsulations ")
encapsulations = []
for i in xrange(0,int(data[7])):
try:
encapsulations.append(bytesToObject(server.recv(4096), groupObj))
#sys.stdout.write(str(i+1) + ", ")
except:
print("RECEIVE ENCAP EXCEPTION ON RUN # {}, RETRYING ONCE".format(i))
encapsulations.append(bytesToObject(server.recv(4096), groupObj))
continue
print('\nEncapsulations received: {}. Generating session key.'.format(len(encapsulations)-1))
return encapsulations
def readFilePkMk(groupObj):
f1 = open("private/pk_bytes", "rb")
f2 = open("private/mk_bytes", "rb")
pk = f1.read()
mk = f2.read()
orig_pk = bytesToObject(pk, groupObj)
orig_mk = bytesToObject(mk, groupObj)
f1.close()
f2.close()
return(orig_pk,orig_mk)
def keygen(self, serPK, serMK, attributeList):
if attributeList is None \
or not(isinstance( attributeList, list)):
raise Exception("attributeList must be set and a list!")
PK = bytesToObject(serPK, self.groupObj)
MK = bytesToObject(serMK, self.groupObj)
SK = self.cpabe.keygen(PK, MK, attributeList)
serSK = objectToBytes(SK, self.groupObj)
return serSK
def read(self, recordType):
if recordType.lower() == "general":
ID = self.General[0]
elif recordType.lower() == "medical":
ID = self.Medical[0]
elif recordType.lower() == "training":
ID = self.Training[0]
else:
print("Please enter the correct record type")
return
# 1. Read MySql Database to obtain string object
# 2. Re-construct Ciphertext by converting it to a byte object, then call Charm's deSerialisation API
# 3. Pass reconstructed ciphertext to dec() function to get plaintext
#####################
#MD: Todo: Add date checking
#####################
db = Database()
rows = db.selectRecord(ID) # Now fetch the ciphertexts and verify the signatures and print the result
for row in rows :
ctI_bytes = bytes(row[0], 'utf-8') # Integer element of CT
ctI_Reconstruct = deserialize(ctI_bytes)
ctPg_bytes = bytes(row[1], 'utf-8') # PairingGroup element of CT
ctReconstruct = bytesToObject(ctPg_bytes, self.group)
ctReconstruct['C']['C'] = ctI_Reconstruct # Complete Ciphertext from Integer and Pairing Group element
pt = self.dec(recordType, ctReconstruct) # Decrypt the Ciphertext
signerID = row[2] # get the id of the signer
sig_bytes = bytes(row[3], 'utf-8')
signature = bytesToObject(sig_bytes, self.signGroup) # Got the actual signature
signdate = row[4]
if self.verifySig(signerID, signdate, pt, signature):
# Signature is valid, now check if entity was authorised at this date
# Dont check our own data since we know it's valid if the signature checks out (we are always allowed to write to our own HealthRecord)
if signerID == self.ID:
print("Verified record from ", signerID, ": ", pt, "\n")
else:
rows = db.getAuthorisedEntities(self.ID, recordType, signdate)
if rows:
for row in rows:
if signerID == row[0]:
print("Verified record from ", signerID, ": ", pt, "\n")
else:
print("INVALID record from ", signerID, ": ", pt, "\n")
else:
#There were no authorisations for this date
print("INVALID record from ", signerID, ": ", pt, "\n")
else:
print("INVALID signature from ", signerID, ": ", pt, "\n")
db.done()
def test1(client, p, nonce, key_client, key_p):
group_object = PairingGroup('SS512')
shared_key = group_object.random(GT)
crypter_a = SymmetricCryptoAbstraction(
extractor(bytesToObject(key_client, group_object)))
crypter_b = SymmetricCryptoAbstraction(
extractor(bytesToObject(key_p, group_object)))
package_b = crypter_b.encrypt(
objectToBytes([shared_key, serialize_endpoint(client)], group_object))
package_a = crypter_a.encrypt(
objectToBytes([
Conversion.OS2IP(nonce), shared_key,
serialize_endpoint(p), package_b
], group_object))
return package_a
def __init__(self):
self.group = GROUP
self.gs_protocol = eval(GS_PROTOCOL)(self.group)
self.path = f'parameters/{GS_PROTOCOL.lower()}'
gpk_path = os.path.join(self.path, 'public/gpk')
self.gpk = bytesToObject(open(gpk_path, 'rb').read(), self.group)
gmsk_path = os.path.join(self.path, 'gm/gmsk')
self.gmsk = bytesToObject(open(gmsk_path, 'rb').read(), self.group)
if GS_PROTOCOL == 'ShortSig':
dic_path = os.path.join(self.path, 'gm/identity.pkl')
self.dic = pickle.load(open(dic_path, 'rb'))
elif GS_PROTOCOL == 'VLRSig':
tokens_path = os.path.join(self.path, 'gm/tokens')
self.tokens = bytesToObject(
open(tokens_path, 'rb').read(), self.group)
def validation(self, pw, t, n):
nc, ns = n
c0 = self._client.get_validation(t, pw, nc)
payload = {'c0': objectToBytes(c0, group),
'ns': objectToBytes(ns, group)}
response = self._requestobj.get("%s/validate" % self._endpoint, params=payload, verify = False)
document = response.json()
return self._client.do_validation(t, pw, ns, nc,
bytesToObject(document['c1'], group),
bytesToObject(document['proof'], group),
document['result'])
def decode_data(self, data):
try:
enc_data = utils.bytesToObject(data, self._groupObj)
except:
print('!!!__ERROR__!!! Ошибка decode_data')
return {'!!!__ERROR__!!! Ошибка decode_data'}
return enc_data
def _load_abe_keys(self, abe_keys_file):
"""Load public and private abe keys"""
if self.debug:
print("Loading abe keys from " + abe_keys_file)
with open(abe_keys_file, 'r') as f:
data = json.load(f)
self.abe_pk = {}
self.abe_sk = {}
for abe_key_pair in data.keys():
self.abe_pk[abe_key_pair] = bytesToObject(
bytes.fromhex(data[abe_key_pair]['pk']), self.pairing_group)
self.abe_sk[abe_key_pair] = bytesToObject(
bytes.fromhex(data[abe_key_pair]['sk']), self.pairing_group)
self.cpabe = CPabe_BSW07(self.pairing_group)
def revokeAuthorisedEntity(self, EntityID, HealthRecordType):
# First check if this entity is authorised
db = Database()
date = time.strftime("%Y-%m-%d %H:%M:%S")
rows = db.getAuthorisedEntities(self.ID, HealthRecordType, date) #Get all authorised entities that are authorised after 1999
if rows:
for row in rows:
if EntityID == row[0]:
found = True
# Found the entity for this specific recordType. Check signature
DateStart = row[1]
signature = bytesToObject(bytes(row[2], 'utf-8'), self.signGroup)
if(self.verifySig(self.ID, DateStart, ''.join(self.ID + EntityID + HealthRecordType), signature)):
# Valid signature found, now revoke it by setting the DateEnd to today and re-signing
# First we need to wait 1 second otherwise the script is too fast!
time.sleep(1)
DateEnd = time.strftime("%Y-%m-%d %H:%M:%S")
# mPK_bytes = db.getSignPubKey("master") # bytes of the master public key
# mPK = bytesToObject(mPK_bytes, self.signGroup) # de-serialize the key before usage
signature = objectToBytes(self.waters.sign(self.masterPK, self.signK, ''.join(self.ID + EntityID + HealthRecordType + DateEnd)), self.signGroup)
db.revokeAuthorisedEntity(self.ID, EntityID, HealthRecordType, DateEnd, signature)
print("Access for ", EntityID, " to write to ", HealthRecordType, " successfully revoked.")
else:
print("INVALID signature on authorisations")
if found == False:
print("Authorisation for ", EntityID, " to write to ", self.ID, "'s ", HealthRecordType, " data not found")
else:
print("Error: no authorisations found for ", self.ID, "'s ", HealthRecordType, " data!")
db.done()
def receive_msg(self, sender, msg):
#print msg[0]
if msg[0] in ["READY", "ECHO", "VAL"]:
self.queues["rb"].put((sender, msg))
if msg[0] == "send":
self.rbfinished = True
message = ast.literal_eval(msg[1])
self.encshares = message['shares']
self.encwitnesses = message['witnesses']
self.share = self.decrypt(self.sharedkey,
message['shares'][self.nodeid])
self.witness = self.decrypt(self.sharedkey,
message['witnesses'][self.nodeid])
self.commit = bytesToObject(message['commit'], self.group)
#if self.pc.verify_eval(self.commit, self.nodeid, self.share, self.witness):
# self.send_ok_msgs()
# self.sendrecs = True
#else:
# self.send_implicate_msgs()
self.send_implicate_msgs()
self.finished = True
while not self.queues["hbavss"].empty():
(i, o) = self.queues["hbavss"].get()
self.receive_msg(i, o)
if not self.rbfinished:
self.queues["hbavss"].put((sender, msg))
elif msg[0] == "ok":
#TODO: Enforce one OK message per participant
self.okcount += 1
if self.okcount == 2 * self.t + 1:
self.output = self.share
#print self.share
if self.reconstruction and self.sendrecs:
self.send_rec_msgs()
self.sendrecs = False
if self.okcount == self.k and not self.reconstruction:
self.finished = True
elif msg[0] == 'implicate':
if self.check_implication(int(sender), msg[1], msg[2]):
self.implicatecount += 1
if self.implicatecount == 2 * self.t + 1:
print "Output: None"
self.share = None
self.finished = True
if self.sendrecs:
self.reconstruction = True
self.send_rec_msgs()
self.sentdrecs = False
else:
self.okcount += 1
elif msg[0] == 'rec':
if self.pc.verify_eval(self.commit, sender, msg[1], msg[2]):
self.shares[sender] = msg[1]
if len(self.shares) == self.t + 1:
coords = []
for key, value in self.shares.iteritems():
coords.append([key, value])
self.secret = interpolate_at_x(coords, 0, self.group)
print self.secret
self.finished = True
def loadDictDataFromFile(verifyParamFilesDict, groupParamArg):
verifyArgsDict = {}
totalNumSigs = len(verifyParamFilesDict)
verifyFuncArgs = list(verifyParamFilesDict[0].keys())
for sigIndex in range(0, totalNumSigs):
verifyArgsDict[sigIndex] = {}
for arg in verifyFuncArgs:
verifyArgsDict[sigIndex][arg] = {}
verifyParamFile = str(verifyParamFilesDict[sigIndex][arg])
if (verifyParamFile.endswith(charmPickleSuffix)):
verifyParamPickle = open(verifyParamFile, 'rb').read()
verifyArgsDict[sigIndex][arg][bodyKey] = bytesToObject(
verifyParamPickle, groupParamArg)
elif (verifyParamFile.endswith(pythonPickleSuffix)):
verifyParamPickle = open(verifyParamFile, 'rb')
verifyArgsDict[sigIndex][arg][bodyKey] = pickle.load(
verifyParamPickle)
elif (verifyParamFile.endswith(repeatSuffix)):
verifyArgsDict[sigIndex][arg][sigNumKey] = verifyParamFile[0:(
len(verifyParamFile) - lenRepeatSuffix)]
else:
tempFile = open(verifyParamFile, 'rb')
tempBuf = tempFile.read()
verifyArgsDict[sigIndex][arg][bodyKey] = tempBuf
return verifyArgsDict
def get_vote():
vote = raw_input("Enter your vote: ") #get vote from user
vote = long(vote)
#Initial setup for Paillier
group = RSAGroup()
pai = pkenc_paillier99.Pai99(group)
#Get public voting public key
f=open("./pyssss/VotingPublic")
data = f.read()
public_key = bytesToObject(data,group)
#Encryption with Paillier
vote = pai.encode(public_key['n'],vote)
ciphervote = pai.encrypt(public_key,vote)
# ciphervotestr = str(str(ciphervote['c']).split('mod')[0])
# print ciphervote['c']
ciphervote = specialInt.serialize(ciphervote['c'])
#pad vote
while (len(ciphervote) < voteSize):
ciphervote += " "
print ciphervote
return ciphervote
def init(persistence=b''):
global state
state = {}
try:
if persistence is None or persistence == b'':
emb.log('ERROR: No persistence value provided. Things may not work correctly.\n')
else:
emb.log('Using passed in persistence value.\n')
state['groupObj'] = PairingGroup('SS512')
tmp = util.bytesToObject(persistence, state['groupObj'])
state.update(tmp)
state['dabe'] = dabe_aw11.Dabe(state['groupObj'])
state['hyb_abema'] = dabenc_adapt_hybrid.HybridABEncMA(state['dabe'], state['groupObj'])
state['gp']['H'] = lambda x: state['groupObj'].hash(x, G1)
emb.log('Loaded state.\n')
return
except Exception:
emb.log('ERROR: Exception while trying to load persistence value. Things may not work correctly.\n')
state['groupObj'] = PairingGroup('SS512')
state['dabe'] = dabe_aw11.Dabe(state['groupObj'])
state['hyb_abema'] = dabenc_adapt_hybrid.HybridABEncMA(state['dabe'], state['groupObj'])
state['gp'] = state['hyb_abema'].setup()
state['authority_sk'] = {}
state['authority_pk'] = {}
state['user_sk'] = {}
emb.log('Created state\n')
def parseFromXML(xmlObjectString, group=None):
assert type(xmlObjectString) == str, "Invalid type for XML object"
dom = parseString(xmlObjectString)
assert dom.documentElement.tagName == "charm", "Not a Charm element"
# print(dom.toprettyxml(indent=" "))
groupObj = dom.getElementsByTagName("group")
assert groupObj != None, "Error: could not find group tag."
groupObj = groupObj[0]
charmObj1 = dom.getElementsByTagName("object")
assert charmObj1 != None, "Error: could not find object tag."
charmObj1 = charmObj1[0]
structure = {}
setting = groupObj.getAttribute("setting")
param = groupObj.getAttribute("param")
charmObj2 = dom.getElementsByTagName("name")
structure['name'] = None
if charmObj2 != None:
charmObj2 = charmObj2[0] # what is this useful for?
structure['name'] = charmObj2.getAttribute("id")
bytesObj = getText(charmObj1.childNodes).strip()
if setting == 'pairing' and group == None:
group = PairingGroup(param)
elif structure['setting'] == 'elliptic_curve' and group == None:
group = ECGroup(param)
elif structure['setting'] == 'integer':
# TODO: this is a special case
pass
return bytesToObject(bytesObj, group)
def parseFromXML(xmlObjectString, group=None):
assert type(xmlObjectString) == str, "Invalid type for XML object"
dom = parseString(xmlObjectString)
assert dom.documentElement.tagName == "charm", "Not a Charm element"
# print(dom.toprettyxml(indent=" "))
groupObj = dom.getElementsByTagName("group")
assert groupObj != None, "Error: could not find group tag."
groupObj = groupObj[0]
charmObj1 = dom.getElementsByTagName("object")
assert charmObj1 != None, "Error: could not find object tag."
charmObj1 = charmObj1[0]
structure = {}
setting = groupObj.getAttribute("setting")
param = groupObj.getAttribute("param")
charmObj2 = dom.getElementsByTagName("name")
structure['name'] = None
if charmObj2 != None:
charmObj2 = charmObj2[0] # what is this useful for?
structure['name'] = charmObj2.getAttribute("id")
bytesObj = getText(charmObj1.childNodes).strip()
if setting == 'pairing' and group == None:
group = PairingGroup(param)
elif structure['setting'] == 'elliptic_curve' and group == None:
group = ECGroup(param)
elif structure['setting'] == 'integer':
# TODO: this is a special case
pass
return bytesToObject(bytesObj, group)
def loadDictDataFromFile(verifyParamFilesDict, groupParamArg):
verifyArgsDict = {}
totalNumSigs = len(verifyParamFilesDict)
verifyFuncArgs = list(verifyParamFilesDict[0].keys())
for sigIndex in range(0, totalNumSigs):
verifyArgsDict[sigIndex] = {}
for arg in verifyFuncArgs:
verifyArgsDict[sigIndex][arg] = {}
verifyParamFile = str(verifyParamFilesDict[sigIndex][arg])
if (verifyParamFile.endswith(charmPickleSuffix)):
verifyParamPickle = open(verifyParamFile, 'rb').read()
verifyArgsDict[sigIndex][arg][bodyKey] = bytesToObject(verifyParamPickle, groupParamArg)
elif (verifyParamFile.endswith(pythonPickleSuffix)):
verifyParamPickle = open(verifyParamFile, 'rb')
verifyArgsDict[sigIndex][arg][bodyKey] = pickle.load(verifyParamPickle)
elif (verifyParamFile.endswith(repeatSuffix)):
verifyArgsDict[sigIndex][arg][sigNumKey] = verifyParamFile[0:(len(verifyParamFile) - lenRepeatSuffix)]
else:
tempFile = open(verifyParamFile, 'rb')
tempBuf = tempFile.read()
verifyArgsDict[sigIndex][arg][bodyKey] = tempBuf
return verifyArgsDict
def decrypt(self, sKey, serializedCiphertext): ''' Decrypt the provided ciphertext sing the secret key. Decryption is only successful if the policy embedded in the secret key matches the ciphertext access policy. NOTE: there is a bug in Charm (?) where a policy of a single value causes an error to be thrown: unsupported right operand types: int, bytes, str Sample code that throws the error: enc2 = EncryptionModule() policy = '(three)' attrs = ['ONE', 'TWO', 'THREE'] msg = "Hello world!" ct2 = enc2.encrypt(msg, policy) sk2 = enc2.generateUserKey(attrs) enc2.decrypt(sk2, ct2) ''' ciphertext = bytesToObject(serializedCiphertext, self.groupObj) c1, c2 = ciphertext['c1'], ciphertext['c2'] success = True try: key = self.cpabe.decrypt(self.public, sKey, c1) if (key == False): success = False except: success = False # Try to perform the decryption if we were able to recover the key plaintext = None if (success == True): cipher = AuthenticatedCryptoAbstraction(sha1(key)) plaintext = cipher.decrypt(c2) return (success, plaintext)
def cpabe_decrypt(group, mpk, deckey, ctxt):
"""Decrypts a ciphertext using the Bethencourt2007cae CP-ABE Scheme.
The plaintext will be returned iff the policy used to generate the
cipher-text can be satisfied by the set of attributes within the
decryption key.
@param group The `PairingGroup` used within the underlying crypto.
@param mpk The Master Public Key of type `mk_t`.
@param deckey The decryption key of type `sk_t`.
@param ctxt The `bytearray` resulting from io.open or io.IOBytes
containing the ciphertext.
@return The `bytearray` containing the plaintext.
@throws PebelDecryptionException If deckey cannot satisfy the
policy within the ciphertext.
"""
cpabe = CPabe_BSW07(group)
ptxt = io.BytesIO()
iv = ctxt.read(AES.block_size)
session_key_size = struct.unpack('<Q', ctxt.read(struct.calcsize('Q')))[0]
session_key_ctxt = bytesToObject(ctxt.read(session_key_size), group)
session_key = cpabe.decrypt(mpk,deckey, session_key_ctxt)
if session_key:
symcipher = AES.new(sha(session_key)[0:32], AES.MODE_CFB, iv)
for b in read_data(bin_data=ctxt, chunksize=AES.block_size):
ptxt.write(symcipher.decrypt(b))
ptxt.flush()
return ptxt.getvalue()
else:
raise PebelDecryptionException("Unable to decrypt given cipher-text.")
def testECGroup(self):
groupObj = ECGroup(prime192v1)
p=groupObj.random()
data={'p':p,'String':"foo",'list':[p,{},1,1.7, b'dfa',]}
x=objectToBytes(data,groupObj)
data2=bytesToObject(x,groupObj)
self.assertEqual(data,data2)
def testPairingGroup(self):
groupobj = PairingGroup('SS512')
p=groupobj.random()
data={'p':p,'String':"foo",'list':[p,{},1,1.7, b'dfa',]}
x=objectToBytes(data,groupobj)
data2=bytesToObject(x,groupobj)
self.assertEqual(data,data2)
def refresh(self, serPK, serMK):
"""
return tupel: (serPK', serMK', conversionFactor)
"""
PK = bytesToObject(serPK, self.groupObj)
MK = bytesToObject(serMK, self.groupObj)
newAlpha = self.groupObj.random(ZR)
PK['e_gg_alpha'] = pair(PK['g'], PK['g2'] ** newAlpha)
g2_newAlpha = PK['g2'] ** newAlpha
conversionFactor = ((g2_newAlpha / MK['g2_alpha']) ** ~(MK['beta']))
MK['g2_alpha'] =g2_newAlpha
newSerPK = objectToBytes(PK, self.groupObj)
newSerMK = objectToBytes(MK, self.groupObj)
return (newSerPK, newSerMK, conversionFactor)
def asym_decrypt(ct_list, key):
public_key, private_key = key
decrypter = RSA_Enc()
serial_pt = b''
for ciphertext in ct_list:
serial_pt += decrypter.decrypt(public_key, private_key, ciphertext)
#end for
return bytesToObject(serial_pt, IntegerGroup())
def testIntegerGroup(self):
self.maxDiff=None
groupObj = IntegerGroup()
p = integer(148829018183496626261556856344710600327516732500226144177322012998064772051982752493460332138204351040296264880017943408846937646702376203733370973197019636813306480144595809796154634625021213611577190781215296823124523899584781302512549499802030946698512327294159881907114777803654670044046376468983244647367)
data={'p':p,'String':"foo",'list':[p,{},1,1.7, b'dfa']}
x=objectToBytes(data,groupObj)
data2=bytesToObject(x,groupObj)
self.assertEqual(data,data2)
def read_key_from_file(fname, group):
"""Utility function to read charm crypto objects from disk.
@param fname The name of the file (`str`) containing the keys.
@param group The `PairingGroup` used within the underlying crypto.
@return A object reconstructed from the file.
"""
with io.open(fname, 'rb') as f:
data = f.read()
return bytesToObject(data, group)
def decryptPKenc(self, params, public_key, secret_key, cid):
Xbytes = pkenc.decrypt(public_key, secret_key, cid['C3'])
X = bytesToObject(Xbytes, group)
m = cid['C2']/pair(cid['C1'],group.hash(X,G1))
if(debug):
print('\nDecrypting...')
print('m=>')
print(m)
return m
def decryptPKenc(self, params, public_key, secret_key, cid):
Xbytes = pkenc.decrypt(public_key, secret_key, cid['C3'])
X = bytesToObject(Xbytes, group)
m = cid['C2'] / pair(cid['C1'], group.hash(X, G1))
if (debug):
print('\nDecrypting...')
print('m=>')
print(m)
return m
def verify(serial_data_and_sig, public_key):
verifier = RSA_Sig()
data_and_sig = bytesToObject(serial_data_and_sig, IntegerGroup())
data, sig = data_and_sig
sig = Conversion.IP2OS(sig)
verdict = verifier.verify(public_key, data, sig)
if verdict == True:
return data
else:
return None
def open(self, msg, signature, time_period, patient_list=None):
signature = bytesToObject(signature, self.group)
if GS_PROTOCOL == 'ShortSig':
identifier = self.gs_protocol.open(self.gpk, self.gmsk, msg,
signature)
identity = self.dic[objectToBytes(identifier, self.group)]
if GS_PROTOCOL == 'VLRSig':
identity = self.gs_protocol.open(self.gpk, self.tokens, signature,
time_period, patient_list)
return identity
def main():
groupObj = PairingGroup('SS512')
cpabe = CPabe_BSW07(groupObj)
abe = HybridABEnc(cpabe, groupObj)
f1 = open("private/pk_bytes", "rb")
f2 = open("private/mk_bytes", "rb")
pk = f1.read()
mk = f2.read()
orig_pk = bytesToObject(pk, groupObj)
orig_mk = bytesToObject(mk, groupObj)
print(orig_pk)
# (pk,mk) = create_pk_mk_abe(abe)
attrs1 = ['CANHTUAN','DUY','MANH']
attrs2 = ['CANHTUAN','DUY']
msg = "canhtuan".encode('utf-8')
# policy = create_policy_abe(attrs2)
policy = '(CANHTUAN and DUY and MANH)'
# print(policy)
sk2 = create_scret_key(abe,orig_pk,orig_mk,attrs1)
ct = encrypt_abe(abe,orig_pk,"tuan".encode('utf-8'), policy)
# print(ct)
ct =b'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'
giaima = decrypt_abe(abe,orig_pk, sk2, ct)
print(giaima)
# main()
def read_key_from_file(fname, group):
"""Utility function to read charm crypto objects from disk.
@param fname The name of the file (`str`) containing the keys.
@param group The `PairingGroup` used within the underlying crypto.
@return A object reconstructed from the file.
"""
with io.open(fname, 'rb') as f:
data = f.read()
return bytesToObject(data, group)
def testIntegerGroup(self):
self.maxDiff = None
groupObj = IntegerGroup()
p = integer(
148829018183496626261556856344710600327516732500226144177322012998064772051982752493460332138204351040296264880017943408846937646702376203733370973197019636813306480144595809796154634625021213611577190781215296823124523899584781302512549499802030946698512327294159881907114777803654670044046376468983244647367
)
data = {'p': p, 'String': "foo", 'list': [p, {}, 1, 1.7, b'dfa']}
x = objectToBytes(data, groupObj)
data2 = bytesToObject(x, groupObj)
self.assertEqual(data, data2)
def deserialize_key(self, matrix_str, generator_bytes):
(Bstr, Bstarstr, gparams) = str.split(matrix_str, '\n')
B = ipe.parse_matrix(Bstr, self.group)
Bstar = ipe.parse_matrix(Bstarstr, self.group)
(g1len, g2len) = str.split(gparams, ' ')
g1bytes = generator_bytes[:int(g1len)]
g2bytes = generator_bytes[int(g1len):]
self.g1 = bytesToObject(g1bytes, self.group)
self.g2 = bytesToObject(g2bytes, self.group)
pp = ()
self.B = B
self.Bstar = Bstar
self.public_parameters = pp
assert self.g1.initPP(
), "ERROR: Failed to init pre-computation table for g1."
assert self.g2.initPP(
), "ERROR: Failed to init pre-computation table for g2."
def refreshSK(self, serSK, conversionFactor):
'''
refreshes the SK by the conversion_factor
return newSerSK
'''
#{ 'D':D, 'Dj':D_j, 'Djp':D_j_pr, 'S':S }
SK = bytesToObject(serSK, self.groupObj)
SK['D'] = SK['D'] * conversionFactor
return objectToBytes(SK, self.groupObj)
def decrypt(self, key, ciphertext):
decryptor = AES.new(objectToBytes(key, self.group)[:32], AES.MODE_CBC, 'This is an IV456')
plaintext_bytes = decryptor.decrypt(ciphertext)
#now we need to strip the padding off the end
#if it's stupid but it works...
elementsize = len(objectToBytes(self.group.random(ZR), self.group))
paddingsize = (16 -elementsize%16)%16
#print len(plaintext_bytes)
#plaintext_bytes = plaintext_bytes[:len(plaintext_bytes) - paddingsize]
#print len(plaintext_bytes)
return bytesToObject(plaintext_bytes, self.group)
def encrypt(message, access_policy, debug=True):
groupObj = PairingGroup('SS512')
cpabe = CPabe_BSW07(groupObj)
hyb_abe = HybridABEnc(cpabe, groupObj)
with open("p_key.txt", "rb") as pkFile:
pk = bytesToObject(pkFile.read(), groupObj)
with open("m_key.txt", "rb") as mkFile:
mk = bytesToObject(mkFile.read(), groupObj)
ct = hyb_abe.encrypt(pk, message, access_policy)
byte_msg = objectToBytes(ct, groupObj)
if debug:
print("pk => ", pk)
print("mk => ", mk)
with open("cipher.txt", "wb") as ctFile:
ctFile.write(byte_msg)
return byte_msg
def readParams(filename='pc.param'):
if (os.path.isfile(filename)):
group = ECGroup(prime192v1)
f = open(filename, 'rb')
params = f.readline()
f.close()
params = bytesToObject(params, group)
return [params, group]
else:
raise Exception(
"I can't find the parameters file. You have to create them first using -n when starting."
)
def verify_transaction_signature(self, sender_address,
sender_global_public_key,
recipient_address, value, signature,
transaction):
"""
Check that the provided signature corresponds to transaction
signed by the private key (sender_address) or user secret key
"""
# public_key = RSA.importKey(binascii.unhexlify(sender_address))
# verifier = PKCS1_v1_5.new(public_key)
# h = SHA.new(str(transaction).encode('utf8'))
# return verifier.verify(h, binascii.unhexlify(signature))
try:
group = PairingGroup('MNT224')
shortSig = ShortSig(group)
sender_public_key = sender_global_public_key
sender_public_key = sender_public_key.encode()
sender_public_key = bytesToObject(sender_public_key, group)
signature = signature.encode()
signature = bytesToObject(signature, group)
transaction_json = json.dumps(transaction)
transaction_hash = SHA256.new(
data=str(transaction_json).encode('utf-8')).hexdigest()
transaction_verification = shortSig.verify(sender_public_key,
transaction_hash,
signature)
print('\n\ntransaction_verification : ', transaction_verification)
except:
sender_public_key = RSA.importKey(
binascii.unhexlify(sender_public_key))
verifier = PKCS1_v1_5.new(sender_public_key)
h = SHA.new(str(transaction).encode('utf8'))
return verifier.verify(h, binascii.unhexlify(signature))
return transaction_verification
def base64_to_keys(self, data):
"""
Given a Base64 string, convert it back to a keyring (or similar).
@return data Base64 string
@returns Keyring (or similar)
@throws KeyRingError if no keys are serialized
"""
keys = bytesToObject(data, self.group)
# Validate result
return self.clean_keys(keys)
def __init__(self):
''' Create the initial master key and then the list to hold the ciphers for encryption.
'''
self.groupObj = PairingGroup('SS512')
if (os.path.isfile('CryptoModule/pubkey.pkl') and os.path.isfile('CryptoModule/masterkey.pkl')):
print("Loading the master and public key from the file")
self.public = bytesToObject(pickle.load(open('CryptoModule/pubkey.pkl', 'rb')), self.groupObj)
self.master = bytesToObject(pickle.load(open('CryptoModule/masterkey.pkl', 'rb')), self.groupObj)
else:
self.cpabe = CPabe_BSW07(self.groupObj)
(self.public, self.master) = self.cpabe.setup()
# Persist the keys
outputPublic = open('CryptoModule/pubkey.pkl', 'wb')
outputMaster = open('CryptoModule/masterkey.pkl', 'wb')
pickle.dump(objectToBytes(self.public, self.groupObj), outputPublic)
pickle.dump(objectToBytes(self.master, self.groupObj), outputMaster)
outputPublic.close()
outputMaster.close()
# Cipher list...
self.cipherList = []
def get_vote():
vote = 2
group = RSAGroup()
pai = pkenc_paillier99.Pai99(group)
f=open('./pyssss/VotingPublic','rb')
data = f.read()
public_key = bytesToObject(data,group)
vote = pai.encode(public_key['n'],vote)
ciphervote = pai.encrypt(public_key,vote)
print ciphervote['c']
ciphertext= specialInt.serialize(ciphervote['c'])
print ciphertext
# ciphervote['c'] = Conversion.bytes2integer(Conversion.IP2OS(7092577248503691820499926901328776752053429606540181306976))
f=open('./pyssss/VotingPrivate','rb')
data = f.read()
secret_key = bytesToObject(data,group)
ciphertext = specialInt.deserialize(ciphertext)
#plaintext=pai.decrypt(public_key, secret_key,ciphervote)
n, n2 = public_key['n'], public_key['n2']
plaintext = ((pai.L(ciphertext ** secret_key['lamda'],n) % n) * secret_key['u']) %n
print plaintext
ciphervote=42
return ciphervote
def decrypt(self, cipher, secret_keys):
"""
Decrypt a given cipher message including header. Message category will
be deduced from cipher.
@param cipher Message to decrypt
@param secret_keys Dictionary of secret keys per category
@return Decrypted message
@throws DecryptError if data is invalid or if attributes are missing in
keypairs
@throws KeyRingError if no public key is available for cipher's category
"""
# Validate parameters
secret_keys = self.clean_keys(secret_keys)
# Create result buffer
cipher = io.BytesIO(base64.b64decode(cipher))
# Initialize AES
try:
aes_iv = cipher.read(AES.block_size)
aes_key_size = struct.unpack("<Q", cipher.read(struct.calcsize("Q")))[0]
aes_key_bytes = cipher.read(aes_key_size)
aes_key_cipher = bytesToObject(aes_key_bytes, self.group)
except (TypeError, struct.error, zlib.error) as e:
raise DecryptError("Decoding cipher failed")
# Unpack category from cipher
category = self.clean_category(aes_key_cipher["category"])
# Unpack key
try:
sk = secret_keys[category]
except LookupError:
raise KeyRingError("No public key and secret key available for category %s" % category)
# Decrypt the AES key
try:
# For some reason, the decrypt method wants a public key. We don't
# supply it since it isn't required.
aes_key_plain = self.scheme.decrypt(None, sk, aes_key_cipher)
except Exception, e:
# There is a bug in Charm which requires a fix in the scheme to not
# crash during execution. See for the idea: http://bit.ly/1e19H7A
if e.args[0] == "Insufficient attributes":
raise DecryptError("Missing attributes for decryption")
else:
raise e
def on_message(self, client, userdata, msg):
CT = None
try:
groupObj = PairingGroup('SS512')
CT = bytesToObject(msg.payload, groupObj)
except:
print(msg.topic+": "+ msg.payload.decode("utf-8") + " with QoS: " + str(msg.qos))
if self.dek is not None and CT is not None:
m = self.decAes(CT)
if msg is None:
print(msg.topic+": (dec failed!), with QoS: " + str(msg.qos))
else:
print(msg.topic+": (dec) "+ m.decode('utf-8') + " with QoS: " + str(msg.qos))
def get_vote():
vote = raw_input("Enter your vote: ") #get vote from user
vote = long(vote)
group = RSAGroup()
pai = pkenc_paillier99.Pai99(group)
f=open('./pyssss/VotingPublic','rb')
data = f.read()
public_key = bytesToObject(data,group)
vote = pai.encode(public_key['n'],vote)
ciphervote = pai.encrypt(public_key,vote)
print ciphervote['c']
f=open('./pyssss/VotingPrivate','rb')
data = f.read()
secret_key = bytesToObject(data,group)
plaintext=pai.decrypt(public_key, secret_key,ciphervote)
print plaintext
ciphervote=42
return ciphervote
def handleNewConnection():
sockfd, addr = server_socket.accept()
userdata[sockfd] = 'Anonymous {}'.format(len(userdata))
#send the room policy
sockfd.send(roomPolicy)
#send pk and group
sockfd.send(objectToBytes(pk,groupObj))
#send key using a attr set
sockfd.send(objectToBytes(cpabe.keygen(pk, msk, attr_dict[i]),groupObj))
#receive the encapsulation
encap = bytesToObject(sockfd.recv(RECV_BUFFER), groupObj)
#save it
encapsulations.append(encap)
entities.append(addr)
broadcastEncapList(sockfd, addr)
broadcast(sockfd, "[server] {} entered room\n".format(userdata[sockfd]))
print 'Users in the room: {}\n\n'.format(str(userdata.values()))