def __process_encryption_key_get(self, input_json_str, response):
"""
Function to process get encryption key request.
Parameters:
- input_json_str is a work order request json as per TCF API 6.1.10 Get Encryption Key Request Payload
- response is the response object to be returned
"""
input_json = json.loads(input_json_str)
worker_id = str(input_json['params']['workerId'])
value = self.kv_helper.get("workers", worker_id)
if value is not None:
json_dict = json.loads(value)
response["result"] = {}
response["result"]["workerId"] = worker_id
encryptionKey = json_dict["details"]["workerTypeData"][
"encryptionKey"]
try:
encryptionKeyNonce = json_dict["details"]["workerTypeData"][
"encryptionKeyNonce"]
except:
encryptionKeyNonce = crypto.random_bit_string(NO_OF_BYTES)
tag = ""
response["result"]["encryptionKey"] = encryptionKey
response["result"]["encryptionKeyNonce"] = encryptionKeyNonce
response["result"]["tag"] = tag
#calculate signature
concat_string = worker_id.encode('UTF-8') + encryptionKey.encode(
'UTF-8') + encryptionKeyNonce.encode('UTF-8') + tag.encode(
'UTF-8')
concat_hash = bytes()
concat_hash = bytes(concat_string)
hash_1 = crypto.compute_message_hash(concat_hash)
s1 = crypto.byte_array_to_base64(hash_1)
# Requires worker private key to sign.
# signature = self.PrivateKey.SignMessage(hash)
response["result"]["signature"] = s1
else:
# Workorder id already exists
response['error'] = {}
response['error'][
'code'] = WorkorderError.INVALID_PARAMETER_FORMAT_OR_VALUE
response['error'][
'message'] = 'Worker Id not found in the database. Hence invalid parameter'
return response
def EncryptionKeyGet(self, **params):
"""
Function to process get encryption key request.
Parameters:
- param is the 'param' object in the a worker request as per TCF
API 6.1.10 Get Encryption Key Request Payload
"""
worker_id = str(params['workerId'])
value = self.kv_helper.get("workers", worker_id)
if value is None:
raise JSONRPCDispatchException(
WorkerError.INVALID_PARAMETER_FORMAT_OR_VALUE,
"Worker id not found in the database. Hence invalid parameter")
worker_type_data = json.loads(value).get("details").get(
"workerTypeData")
encryptionKey = worker_type_data["encryptionKey"]
try:
encryptionKeyNonce = worker_type_data["encryptionKeyNonce"]
except:
encryptionKeyNonce = crypto.random_bit_string(NO_OF_BYTES)
tag = ""
# calculate signature
concat_string = worker_id.encode('UTF-8') + encryptionKey.encode(
'UTF-8') + encryptionKeyNonce.encode('UTF-8') + tag.encode('UTF-8')
concat_hash = bytes()
concat_hash = bytes(concat_string)
hash_1 = crypto.compute_message_hash(concat_hash)
s1 = crypto.byte_array_to_base64(hash_1)
# Requires worker private key to sign.
# signature = self.PrivateKey.SignMessage(hash)
result = {
"workerId": worker_id,
"encryptionKey": encryptionKey,
"encryptionKeyNonce": encryptionKeyNonce,
"tag": "",
"signature": s1,
}
return result
def generate_client_signature(self,
input_json_str,
worker,
private_key,
session_key,
session_iv,
encrypted_session_key,
data_key=None,
data_iv=None):
"""
Function to generate client signature
Parameters:
- input_json_str is requester Work Order Request payload in a
JSON-RPC based format defined 6.1.1 Work Order Request Payload
- worker is a worker object to store all the common details of
worker as per TCF API 8.1 Common Data for All Worker Types
- private_key is Client private key
- session_key is one time session key generated by the participant
submitting the work order.
- session_iv is an initialization vector if required by the
data encryption algorithm (encryptedSessionKey). The default is all zeros.
- data_key is a one time key generated by participant used to encrypt
work order indata
- data_iv is an intialization vector used along with data_key.
Default is all zeros.
- encrypted_session_key is a encrypted version of session_key.
Returns a tuple containing signature and status
"""
if (self.__payload_json_check(input_json_str) is False):
logger.error("ERROR: Signing the request failed")
return None
if (self.tcs_worker['HashingAlgorithm'] != worker.hashing_algorithm):
logger.error(
"ERROR: Signing the request failed. Hashing algorithm is not supported for %s",
worker.hashing_algorithm)
return None
if (self.tcs_worker['SigningAlgorithm'] != worker.signing_algorithm):
logger.error(
"ERROR: Signing the request failed. Signing algorithm is not supported for %s",
worker.signing_algorithm)
return None
input_json = json.loads(input_json_str)
input_json_params = input_json['params']
input_json_params["sessionKeyIv"] = ''.join(
format(i, '02x') for i in session_iv)
encrypted_session_key_str = ''.join(
format(i, '02x') for i in encrypted_session_key)
self.__encrypt_workorder_indata(input_json_params, session_key,
session_iv, worker.encryption_key,
data_key, data_iv)
if input_json_params["requesterNonce"] and \
is_hex(input_json_params["requesterNonce"]):
nonce = crypto.string_to_byte_array(
input_json_params["requesterNonce"])
else:
# [NO_OF_BYTES] 16 BYTES for nonce, is the recommendation by NIST to
# avoid collisions by the "Birthday Paradox".
nonce = crypto.random_bit_string(NO_OF_BYTES)
request_nonce_hash = crypto.compute_message_hash(nonce)
nonce_hash = (
crypto.byte_array_to_base64(request_nonce_hash)).encode('UTF-8')
hash_string_1 = self.__calculate_hash_on_concatenated_string(
input_json_params, nonce_hash)
data_objects = input_json_params['inData']
hash_string_2 = self.calculate_datahash(data_objects)
hash_string_3 = ""
if 'outData' in input_json_params:
data_objects = input_json_params['outData']
data_objects.sort(key=lambda x: x['index'])
hash_string_3 = self.calculate_datahash(data_objects)
concat_string = hash_string_1 + hash_string_2 + hash_string_3
concat_hash = bytes(concat_string, 'UTF-8')
final_hash = crypto.compute_message_hash(concat_hash)
encrypted_request_hash = utility.encrypt_data(final_hash, session_key,
session_iv)
encrypted_request_hash_str = ''.join(
format(i, '02x') for i in encrypted_request_hash)
logger.debug("encrypted request hash: \n%s",
encrypted_request_hash_str)
#Update the input json params
input_json_params["encryptedRequestHash"] = encrypted_request_hash_str
status, signature = self.generate_signature(final_hash, private_key)
if status == False:
return SignatureStatus.FAILED
input_json_params['requesterSignature'] = signature
input_json_params["encryptedSessionKey"] = encrypted_session_key_str
# Temporary mechanism to share client's public key. Not a part of Spec
input_json_params['verifyingKey'] = self.public_key
input_json_params['requesterNonce'] = crypto.byte_array_to_base64(
request_nonce_hash)
input_json['params'] = input_json_params
input_json_str = json.dumps(input_json)
logger.info("Request Json successfully Signed")
return input_json_str, SignatureStatus.PASSED
else:
logger.error(
"ERROR: Symmetric decryption (random IV) " +
"invalid key detection test failed: ", exc)
sys.exit(-1)
try:
iv = crypto.SKENC_GenerateIV("A message")
except Exception as exc:
logger.error(
"ERROR: Symmetric encryption deterministic iv generation " +
"test failed: ", exc)
sys.exit(-1)
logger.debug(
"Symmetric encryption deterministic iv generation test successful!")
try:
rand = crypto.random_bit_string(16)
except Exception as exc:
logger.error("ERROR: Random number generation failed: ", exc)
sys.exit(-1)
logger.debug("Random number generation successful!")
hash = crypto.compute_message_hash(rand)
bhash = bytearray(hash)
b64hash = crypto.byte_array_to_base64(bhash)
logger.debug("Hash computed!")
crypto.base64_to_byte_array(b64hash)
logger.debug("SWIG CRYPTO_WRAPPER TEST SUCCESSFUL!")
sys.exit(0)
