def add_encrypted_request_hash(self):
"""
calculates request has based on EEA trusted-computing spec 6.1.8.1
and set encryptedRequestHash parameter in the request.
"""
sig_obj = signature.ClientSignature()
concat_string = self.get_requester_nonce() + \
self.get_work_order_id() + \
self.get_worker_id() + \
self.get_workload_id() + \
self.get_requester_id()
concat_bytes = bytes(concat_string, "UTF-8")
#SHA-256 hashing is used
hash_1 = crypto.byte_array_to_base64(
crypto.compute_message_hash(concat_bytes))
hash_2 = sig_obj.calculate_datahash(self.get_in_data())
hash_3 = ""
out_data = self.get_out_data()
if out_data and len(out_data) > 0:
hash_3 = sig_obj.calculate_datahash(out_data)
concat_hash = hash_1 + hash_2 + hash_3
concat_hash = bytes(concat_hash, "UTF-8")
self.final_hash = crypto.compute_message_hash(concat_hash)
encrypted_request_hash = utility.encrypt_data(self.final_hash,
self.session_key,
self.session_iv)
self.params_obj["encryptedRequestHash"] = crypto.byte_array_to_hex(
encrypted_request_hash)
def calculate_request_hash(self, input_json):
"""
Function to create the work order reuest hash
as defined in EEA spec 6.1.8.1
Parameters:
- input_json is dictionary contains work order request payload
as define EEA spec 6.1.1
Returns hash of work order request as string
"""
wo_request_params = input_json["params"]
concat_string = wo_request_params["requesterNonce"] + \
wo_request_params["workOrderId"] + \
wo_request_params["workerId"] + \
wo_request_params["workloadId"] + \
wo_request_params["requesterId"]
concat_bytes = bytes(concat_string, "UTF-8")
# SHA-256 hashing is used
hash_1 = crypto.byte_array_to_base64(
crypto.compute_message_hash(concat_bytes)
)
hash_2 = self.calculate_datahash(wo_request_params["inData"])
hash_3 = ""
if "outData" in wo_request_params and \
len(wo_request_params["outData"]) > 0:
hash_3 = self.calculate_datahash(wo_request_params["outData"])
concat_hash = hash_1 + hash_2 + hash_3
concat_hash = bytes(concat_hash, "UTF-8")
final_hash = crypto.compute_message_hash(concat_hash)
final_hash_str = crypto.byte_array_to_hex(final_hash)
return final_hash_str
def update_receipt(self, work_order_id, update_type, update_data,
signing_key):
"""
Update the existing work order receipt with
update_type, update_data.
Parameters:
- work_order_id is work order id whose receipt
needs to be updated.
- update_type is integer, these values corresponds to
receipt status as defined in 7.1.1
- update_data is update-specific data that depend on
the workOrderStatus
Returns jrpc work order update receipt request of type dictionary
"""
data = update_data
if update_type in [
ReceiptCreateStatus.PROCESSED.value,
ReceiptCreateStatus.COMPLETED.value
]:
# Work Order Receipt status is set to be completed or processed,
# then update_data should be work order response.
wo_resp_str = json.dumps(update_data)
wo_resp_bytes = bytes(wo_resp_str, "UTF-8")
# Hash of work order response is update_data
wo_resp_hash = crypto.compute_message_hash(wo_resp_bytes)
wo_resp_hash_str = crypto.byte_array_to_hex(wo_resp_hash)
data = wo_resp_hash_str
public_key = signing_key.GetPublicKey().Serialize()
updater_id = utility.strip_begin_end_key(public_key)
wo_receipt_update = {
"workOrderId": work_order_id,
"updaterId": updater_id,
"updateType": update_type,
"updateData": data,
"signatureRules":
self.HASHING_ALGORITHM + "/" + self.SIGNING_ALGORITHM,
"receiptVerificationKey": public_key
}
wo_receipt_str = wo_receipt_update["workOrderId"] + \
str(wo_receipt_update["updateType"]) + \
wo_receipt_update["updateData"]
wo_receipt_bytes = bytes(wo_receipt_str, "UTF-8")
wo_receipt_hash = crypto.compute_message_hash(wo_receipt_bytes)
status, wo_receipt_sign = self.sig_obj.generate_signature(
wo_receipt_hash, signing_key)
if status is False:
# if generating signature failed.
wo_receipt_update["updateSignature"] = ""
raise Exception("Generate signature is failed")
else:
wo_receipt_update["updateSignature"] = wo_receipt_sign
return wo_receipt_update
def calculate_datahash(self, data_objects):
"""
Function to calculate a hash value of the array concatenating dataHash, data,
encryptedDataEncryptionKey, iv for each item in the inData/outData array
Parameters:
- data_objects is each item in inData or outData part of workorder request as per TCF API 6.1.7 Work Order Data Formats
"""
hash_str = ""
for item in data_objects:
datahash = "".encode('UTF-8')
e_key = "".encode('UTF-8')
iv = "".encode('UTF-8')
if 'dataHash' in item:
datahash = item['dataHash'].encode('UTF-8')
data = item['data'].encode('UTF-8')
if 'encryptedDataEncryptionKey' in item:
e_key = item['encryptedDataEncryptionKey'].encode('UTF-8')
if 'iv' in item:
iv = item['iv'].encode('UTF-8')
concat_string = datahash + data + e_key + iv
concat_hash = bytes(concat_string)
hash = crypto.compute_message_hash(concat_hash)
hash_str = hash_str + crypto.byte_array_to_base64(hash)
return hash_str
def verify_update_receipt_signature(self, input_json):
"""
Function to verify the signature of work order receipt update
Parameters:
- input_json is dictionary contains payload returned by the
WorkOrderReceiptUpdateRetrieve API as define EEA spec 7.2.7
Returns enum type SignatureStatus
"""
input_json_params = input_json['result']
concat_string = input_json_params["workOrderId"] + \
str(input_json_params["updateType"]) + \
input_json_params["updateData"]
concat_hash = bytes(concat_string, 'UTF-8')
final_hash = crypto.compute_message_hash(concat_hash)
signature = input_json_params["updateSignature"]
verification_key = input_json_params["receiptVerificationKey"]
try:
_verifying_key = crypto.SIG_PublicKey(verification_key)
except Exception as error:
logger.info("Error in verification key : %s", error)
return SignatureStatus.INVALID_VERIFICATION_KEY
decoded_signature = crypto.base64_to_byte_array(signature)
sig_result = _verifying_key.VerifySignature(
final_hash, decoded_signature)
if sig_result == 1:
return SignatureStatus.PASSED
elif sig_result == 0:
return SignatureStatus.FAILED
else:
return SignatureStatus.INVALID_SIGNATURE_FORMAT
def __calculate_hash_on_concatenated_string(
self, input_json_params, nonce_hash):
"""
Function to calculate a hash value of the string concatenating the
following values:
requesterNonce, workOrderId, workerId, workloadId, and requesterId.
Parameters:
- input_json_params is a collection of parameters,
as per TCF APi 6.1.1 Work Order Request Payload
- nonce_hash is SHA256 hashed value of a random string generated by
the participant.
"""
workorder_id = (input_json_params['workOrderId']).encode('UTF-8')
worker_id = (input_json_params['workerId']).encode('UTF-8')
workload_id = "".encode('UTF-8')
if 'workloadId' in input_json_params:
workload_id = (input_json_params['workloadId']).encode('UTF-8')
requester_id = (input_json_params['requesterId']).encode('UTF-8')
concat_string = nonce_hash + workorder_id + worker_id + workload_id + \
requester_id
concat_hash = bytes(concat_string)
# SHA-256 hashing is used
hash_1 = crypto.compute_message_hash(concat_hash)
result_hash = crypto.byte_array_to_base64(hash_1)
return result_hash
def verify_signature(self,response_str,worker):
"""
Function to verify the signature received from the enclave
Parameters:
- response_str is json payload returned by the Worker Service in response to successful workorder submit request as per TCF API 6.1.2 Work Order Result 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
"""
input_json = json.loads(response_str)
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 SignatureStatus.ERROR_RESPONSE
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 SignatureStatus.ERROR_RESPONSE
#Checking for a error response.
if 'error' in input_json.keys():
return SignatureStatus.ERROR_RESPONSE
input_json_params = input_json['result']
#Checking if error is response
if 'code' in input_json_params.keys() and input_json_params['code'] < 0 :
return SignatureStatus.ERROR_RESPONSE
nonce = (input_json_params['workerNonce']).encode('UTF-8')
signature = input_json_params['workerSignature']
hash_string_1 = self.__calculate_hash_on_concatenated_string(input_json_params, nonce)
data_objects = input_json_params['outData']
data_objects.sort(key = lambda x:x['index'])
hash_string_2 = self.__calculate_datahash(data_objects)
concat_string = hash_string_1+ hash_string_2
concat_hash = bytes(concat_string, 'UTF-8')
final_hash = crypto.compute_message_hash(concat_hash)
verify_key = worker.worker_typedata_verification_key
try:
_verifying_key = crypto.SIG_PublicKey(verify_key)
except Exception as error:
logger.info("Error in verification key : %s", error)
return SignatureStatus.INVALID_VERIFICATION_KEY
decoded_signature = crypto.base64_to_byte_array(signature)
sig_result =_verifying_key.VerifySignature(final_hash, decoded_signature)
if sig_result == 1 :
return SignatureStatus.PASSED
elif sig_result == 0 :
return SignatureStatus.FAILED
else :
return SignatureStatus.INVALID_SIGNATURE_FORMAT
def create_receipt(self,
wo_request,
receipt_create_status,
signing_key,
nonce=None):
"""
Create work order receipt corresponding to workorder id
Parameters:
- wo_request is jrpc work order request used to create the
work order request as defined in EEA spec 6.1.1.
- receipt_create_status is enum of type ReceiptCreateStatus
- signing_key is private key
- nonce is int type random number or monotonic counter
Returns jrpc request of type dictionary
"""
final_hash_str = self.sig_obj.calculate_request_hash(wo_request)
wo_request_params = wo_request["params"]
worker_id = wo_request_params["workerId"]
requester_nonce = nonce
if nonce is None:
requester_nonce = str(random.randint(1, 10**10))
public_key = signing_key.GetPublicKey().Serialize()
wo_receipt_request = {
"workOrderId": wo_request_params["workOrderId"],
# TODO: workerServiceId is same as worker id,
# needs to be updated with actual service id
"workerServiceId": worker_id,
"workerId": worker_id,
"requesterId": wo_request_params["requesterId"],
"receiptCreateStatus": receipt_create_status,
"workOrderRequestHash": final_hash_str,
"requesterGeneratedNonce": requester_nonce,
"signatureRules":
self.HASHING_ALGORITHM + "/" + self.SIGNING_ALGORITHM,
"receiptVerificationKey": public_key
}
wo_receipt_str = wo_receipt_request["workOrderId"] + \
wo_receipt_request["workerServiceId"] + \
wo_receipt_request["workerId"] + \
wo_receipt_request["requesterId"] + \
str(wo_receipt_request["receiptCreateStatus"]) + \
wo_receipt_request["workOrderRequestHash"] + \
wo_receipt_request["requesterGeneratedNonce"]
wo_receipt_bytes = bytes(wo_receipt_str, "UTF-8")
wo_receipt_hash = crypto.compute_message_hash(wo_receipt_bytes)
status, wo_receipt_sign = self.sig_obj.generate_signature(
wo_receipt_hash, signing_key)
if status is False:
# if generate signature is failed.
wo_receipt_request["requesterSignature"] = ""
raise Exception("Generate signature is failed")
else:
wo_receipt_request["requesterSignature"] = wo_receipt_sign
return wo_receipt_request
def __validate_work_order_receipt_update_req(self, wo_receipt_req):
"""
Function to validate the work order receipt create request parameters
Parameters:
- wo_receipt_req is work order receipt request as dictionary
Returns - tuple containing validation status(Boolean) and error
message(string)
"""
valid_params = [
"workOrderId", "updaterId", "updateType", "updateData",
"updateSignature", "signatureRules", "receiptVerificationKey"
]
for key in wo_receipt_req["params"]:
if key not in valid_params:
return False, "Missing parameter " + key + " in the request"
else:
if key in ["workOrderId", "updaterId"]:
if not is_valid_hex_str(wo_receipt_req[key]):
return False, "invalid data parameter for " + key
elif key in ["updateData", "updateSignature"]:
try:
base64.b64decode(wo_receipt_req[key])
except Exception:
return False, "Invalid data format for " + key
update_type = wo_receipt_req["params"]["updateType"]
try:
update_enum_value = ReceiptCreateStatus(update_type)
except Exception as err:
return False, "Invalid receipt update type {}: {}".format(
update_enum_value, str(err))
# If update type is completed or processed,
# it is a hash value of the Work Order Response
if wo_receipt_req["params"]["updateType"] in [
ReceiptCreateStatus.PROCESSED.value,
ReceiptCreateStatus.COMPLETED.value
]:
wo_id = wo_receipt_req["params"]["workOrderId"]
# Load the work order response and calculate it's hash
wo_resp = self.kv_helper.get("wo-responses", wo_id)
wo_resp_bytes = bytes(wo_resp, "UTF-8")
wo_resp_hash = crypto.compute_message_hash(wo_resp_bytes)
wo_resp_hash_str = crypto.byte_array_to_hex(wo_resp_hash)
if wo_resp_hash_str != wo_receipt_req["params"]["updateData"]:
return False, "Invalid Update data in the request"
# If all validation is pass
return True, ""
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 verify_signature(self, input_json, verification_key):
"""
Function to verify the signature received from the enclave
Parameters:
- input_json is dictionary contains payload returned by the
Worker Service in response to successful workorder submit request
as per TCF API 6.1.2 Work Order Result Payload
- verification_key is ECDSA/SECP256K1 public key used to verify
signatures created by the Enclave.
Returns enum type SignatureStatus
"""
input_json_params = input_json['result']
nonce = (input_json_params['workerNonce']).encode('UTF-8')
signature = input_json_params['workerSignature']
hash_string_1 = self.__calculate_hash_on_concatenated_string(
input_json_params, nonce)
data_objects = input_json_params['outData']
data_objects.sort(key=lambda x: x['index'])
hash_string_2 = self.calculate_datahash(data_objects)
concat_string = hash_string_1 + hash_string_2
concat_hash = bytes(concat_string, 'UTF-8')
final_hash = crypto.compute_message_hash(concat_hash)
try:
_verifying_key = crypto.SIG_PublicKey(verification_key)
except Exception as error:
logger.info("Error in verification key : %s", error)
return SignatureStatus.INVALID_VERIFICATION_KEY
decoded_signature = crypto.base64_to_byte_array(signature)
sig_result = _verifying_key.VerifySignature(final_hash,
decoded_signature)
if sig_result == 1:
return SignatureStatus.PASSED
elif sig_result == 0:
return SignatureStatus.FAILED
else:
return SignatureStatus.INVALID_SIGNATURE_FORMAT
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
def hashed_identity(self):
key_byte_array = crypto.string_to_byte_array(self.txn_public)
hashed_txn_key = crypto.compute_message_hash(key_byte_array)
encoded_hashed_key = crypto.byte_array_to_hex(hashed_txn_key)
encoded_hashed_key = encoded_hashed_key.lower()
return encoded_hashed_key
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)
def compute_data_hash(data):
'''
Computes SHA-256 hash of data
'''
data_hash = crypto.compute_message_hash(data.encode("UTF-8"))
return data_hash
