def decrypt_data():
aes_cipher = AESCipher(client.secret_key)
encrypted_uri = self.handler.request.headers.get(
'X-Api-Encrypted-Uri')
if encrypted_uri:
request.uri = aes_cipher.decrypt(utf8(encrypted_uri))
logger.debug('decrypted uri %s' % request.uri)
encrypted_headers = self.handler.request.headers.get(
'X-Api-Encrypted-Headers')
if encrypted_headers:
headers_str = aes_cipher.decrypt(utf8(encrypted_headers))
headers = dict(json.loads(headers_str))
logger.debug('raw headers %s' % request.headers)
for k, v in headers.iteritems():
# 要全部使用 text_type，否则会出现有的为 str，有的为 unicode
# 导致422错误
request.headers[text_type(k)] = text_type(v)
logger.debug('decrypted headers %s' % request.headers)
if request.body and len(request.body) > 0:
logger.debug('解密 body')
logger.debug(request.body)
request.body = aes_cipher.decrypt(utf8(request.body))
def decrypt_data():
aes_cipher = AESCipher(client.secret_key)
encrypted_uri = self.handler.request.headers.get('X-Api-Encrypted-Uri')
if encrypted_uri:
request.uri = aes_cipher.decrypt(utf8(encrypted_uri))
logger.debug('decrypted uri %s' % request.uri)
# 因为修改了 uri，需要重新生成 query_arguments
request.path, sep, request.query = request.uri.partition('?')
request.arguments = parse_qs_bytes(request.query, keep_blank_values=True)
request.query_arguments = copy.deepcopy(request.arguments)
encrypted_headers = self.handler.request.headers.get('X-Api-Encrypted-Headers')
if encrypted_headers:
headers_str = aes_cipher.decrypt(utf8(encrypted_headers))
headers = dict(json_decode(headers_str))
# logger.debug('raw headers %s' % request.headers)
for k, v in iteritems(headers):
# 要全部使用 text_type，否则会出现有的为 str，有的为 unicode
# 导致422错误
request.headers[text_type(k)] = text_type(v)
# logger.debug('decrypted headers %s' % request.headers)
if request.body and len(request.body) > 0:
logger.debug('解密 body')
logger.debug(request.body)
request.body = aes_cipher.decrypt(utf8(request.body))
# 因为修改了 body，需要重新 _parse_body
request._parse_body()
def getKey(self, cmd=False):
if os.path.isfile('wallets/' + self.name + '.privkey'):
with open('wallets/' + self.name + '.privkey',
'r',
encoding='utf-8') as key:
encKey = key.read()
enc = AESCipher(self.phrase)
try:
self.key = enc.decrypt(encKey)
except UnicodeDecodeError:
print(color.E('\nIncorrect passphrase for wallet!\n'))
else:
self.key = False
print(color.E('\nWallet not found!\n'))
def decrypt_data(self, body):
try:
aes_cipher = AESCipher(self.secret_key)
if body and len(body) > 0:
logger.debug('解密 body')
logger.debug(body.encode('hex'))
body = aes_cipher.decrypt(utf8(body))
# logger.debug(body.decode('hex'))
except Exception as e:
logger.error('解密数据出错')
logger.error(e)
logger.error(traceback.format_exc())
return None
return body
def decrypt_data(self, body):
try:
aes_cipher = AESCipher(self.secret_key)
if body and len(body) > 0:
logger.debug('解密 body')
logger.debug(body.encode('hex'))
body = aes_cipher.decrypt(utf8(body))
# logger.debug(body.decode('hex'))
except Exception as e:
logger.error('解密数据出错')
logger.error(e)
logger.error(traceback.format_exc())
return None
return body
def decrypt_data(self, body):
try:
aes_cipher = AESCipher(self.secret_key)
if body and len(body) > 0:
logger.debug('解密 body')
body = aes_cipher.decrypt(utf8(body))
# logger.debug(body.decode('hex'))
except Exception as e:
logger.error('解密数据出错')
logger.error(e)
logger.error(traceback.format_exc())
return None
# 由于 requests 的 content 不是 unicode 类型, 为了兼容, 这里改成 utf8
if isinstance(body, text_type):
body = body.encode('utf-8')
return body
def callback(message):
logging.info("********** Start PubsubMessage ")
message.ack()
logging.info('Received message ID: {}'.format(message.message_id))
logging.info('Received message publish_time: {}'.format(
message.publish_time))
if args.mode == 'decrypt':
try:
ac = AESCipher(key)
logging.info("Loaded Key: " + ac.printKeyInfo())
decrypted_data = ac.decrypt(message.data, associated_data='')
logging.info('Decrypted data ' + decrypted_data)
logging.info("ACK message")
message.ack()
except Exception as e:
logging.info("Unable to decrypt message; NACK pubsub message " +
str(e))
message.nack()
logging.info("End AES decryption")
if args.mode == 'verify':
try:
logging.info("Starting HMAC")
hmac = message.attributes.get('signature')
hh = HMACFunctions(key)
logging.info("Loaded Key: " + hh.printKeyInfo())
logging.info("Verify message: " + str(message.data))
logging.info(' With HMAC: ' + str(hmac))
hashed = hh.hash(message.data)
if (hh.verify(message.data, base64.b64decode(hashed))):
logging.info("Message authenticity verified")
message.ack()
else:
logging.error("Unable to verify message")
message.nack()
except Exception as e:
logging.info("Unable to verify message; NACK pubsub message " +
str(e))
message.nack()
logging.info("********** End PubsubMessage ")
def callback(message):
logging.info("********** Start PubsubMessage ")
logging.info('Received message ID: {}'.format(message.message_id))
logging.info('Received message publish_time: {}'.format(
message.publish_time))
if args.mode == "verify":
try:
key_id = message.attributes['key_id']
service_account = message.attributes['service_account']
signature = message.attributes['signature']
m = hashlib.sha256()
m.update(message.data)
data_to_verify = m.digest()
logging.info("Attempting to verify message: " + str(message.data))
logging.info("data_to_verify " +
base64.b64encode(data_to_verify).decode('utf-8'))
logging.info("Verify message with signature: " + str(signature))
logging.info(" Using service_account/key_id: " + service_account +
" " + key_id)
cert_url = 'https://www.googleapis.com/service_accounts/v1/metadata/x509/' + service_account
r = requests.get(cert_url)
pem = r.json().get(key_id)
v = crypt.RSAVerifier.from_string(pem)
if v.verify(data_to_verify, base64.b64decode(signature)):
logging.info("Message integrity verified")
message.ack()
else:
logging.info("Unable to verify message")
message.nack()
logging.info("********** End PubsubMessage ")
except Exception as e:
logging.info("Unable to verify message; NACK pubsub message " +
str(e))
message.nack()
if args.mode == "decrypt":
try:
key_id = message.attributes['key_id']
msg_service_account = message.attributes['service_account']
logging.info("Attempting to decrypt message: " + str(message.data))
logging.info(" Using service_account/key_id: " +
msg_service_account + " " + key_id)
if args.cert_service_account == None:
logging.error(
"********** cert_service_account must be specified to decrypt "
)
message.nack()
sys.exit()
credentials = Credentials.from_service_account_file(
args.cert_service_account)
key_key_id = credentials._signer._key_id
key_service_account_email = credentials.service_account_email
if (msg_service_account != key_service_account_email):
logging.info(
"Service Account specified in command line does not match message payload service account"
)
logging.info(msg_service_account + " --- " +
args.cert_service_account)
message.nack()
return
else:
private_key = credentials._signer._key
rs = RSACipher(private_key=private_key)
try:
logging.debug(
'Received message attributes["dek_wrapped"]: {}'.
format(message.attributes['dek_wrapped']))
dek_wrapped = message.attributes['dek_wrapped']
logging.info('Wrapped DEK ' + dek_wrapped)
dek_cleartext = rs.decrypt(dek_wrapped)
logging.info('Decrypted DEK ' + dek_cleartext)
dek = AESCipher(encoded_key=dek_cleartext)
logging.info(dek.printKeyInfo())
plaintext = dek.decrypt(message.data, associated_data="")
except ValueError:
logging.error(
"dek_wrapped not sent, attempting to decrypt with svc account rsa key"
)
plaintext = rs.decrypt(message.data)
except Exception as e:
logging.error("Error Decrypting payload " + str(e))
message.nack()
return
logging.info("Decrypted Message payload: " + plaintext)
message.ack()
except Exception as e:
logging.info("Unable to decrypt message; NACK pubsub message " +
str(e))
message.nack()
logging.info("********** End PubsubMessage ")
class ClientConnector(Protocol):
"""Handle one connection to a client.
Its functions include:
- Initiate connection to client.
- Send an authentication message to client to start transmission.
- Receive encrypted data packets from client, separated by split_char.
- Decrypt data packets. Get the ID (first 2 bytes of decrypted text).
Create a connection to HTTP proxy for each unique ID.
- Forward request to HTTP proxy. Encrypt and send back the response.
- Close connection to HTTP proxy for a given ID if a packet
of the ID with close_char is received.
"""
def __init__(self, initiator):
self.initiator = initiator
self.main_pw = self.initiator.main_pw
# control characters
self.split_char = chr(27) + chr(28) + "%X" % struct.unpack(
'B', self.main_pw[-2:-1])[0] + "%X" % struct.unpack(
'B', self.main_pw[-3:-2])[0] + chr(31)
self.client_pub = self.initiator.client_pub
self.session_pw = urandom(16)
self.cipher = AESCipher(self.session_pw, self.main_pw)
self.authenticated = False
self.buffer = ""
self.latency = 10000
self.i = initiator.register()
self.idchar = (str(self.i) if 10 <= self.i <= 99 else '0' +
str(self.i))
self.cronjob = None
self.cancel_job = None
def generate_auth_msg(self):
"""Generate encrypted message. For auth and init.
The message is in the form
server_sign(main_pw) (HEX) +
client_pub(session_pw) + id
Total length is 512 + 256 + 2 = 770 bytes
"""
pw_enc = self.client_pub.encrypt(self.session_pw, None)[0]
return '\r\n'.join(
(self.initiator.signature_to_client, pw_enc, self.idchar,
repr(self.initiator.client_recv_index_dict[self.i])))
def ping_send(self):
"""Send the initial ping message to the client at a certain interval.
Ping mechanism (S for server, C for client, t-i for i-th timestamp):
packet 0: S->C, t-0
packet 1: C->S, t-0 + t-1
packet 2: S->C, t-1
In this way, both server and client get the round-trip latency.
Packet format (before encryption):
"1" (1 byte) (type flag for ping)
seq (1 byte) (0, 1 or 2)
timestamp (11 or 22 bytes) (time in milliseconds, in hexagon)
"""
raw_packet = "1" + "0" + get_timestamp()
to_write = self.cipher.encrypt(raw_packet) + self.split_char
if self.authenticated:
#logging.debug("send ping0")
self.transport.write(to_write)
interval = random.randint(500, 1500) / 100
if self.initiator.obfs_level == 3:
RESET_INTERVAL = 5
else:
RESET_INTERVAL = 2
self.cronjob = reactor.callLater(interval, self.ping_send)
self.cancel_job = reactor.callLater(RESET_INTERVAL, self.close)
def ping_recv(self, msg):
"""Parse ping 1 (without flag & seq) and send ping 2."""
#logging.debug("recv ping1")
self.cancel_job.cancel()
time0 = parse_timestamp(msg[:11])
self.latency = int(time() * 1000) - time0
logging.debug("latency: %dms" % self.latency)
raw_packet = "1" + "2" + msg[11:]
to_write = self.cipher.encrypt(raw_packet) + self.split_char
if self.transport:
#logging.debug("send ping2")
self.transport.write(to_write)
def connectionMade(self):
"""Event handler of being successfully connected to the client."""
logging.info("connected to client " +
addr_to_str(self.transport.getPeer()))
self.transport.write(self.generate_auth_msg() + self.split_char)
def dataReceived(self, recv_data):
"""Event handler of receiving some data from client.
Split, decrypt and hand them back to Control.
"""
# Avoid repetition caused by ping
# logging.debug("received %d bytes from client " % len(recv_data) +
# addr_to_str(self.transport.getPeer()))
self.buffer += recv_data
# a list of encrypted data packages
# the last item may be incomplete
recv = self.buffer.split(self.split_char)
# leave the last (may be incomplete) item intact
for text_enc in recv[:-1]:
text_dec = self.cipher.decrypt(text_enc)
# flag is 0 for normal data packet, 1 for ping packet, 2 for auth
flag = int(text_dec[0])
if flag == 0:
self.initiator.client_recv(text_dec[1:], self)
elif flag == 2:
auth_str = "AUTHENTICATED" + self.idchar
if text_dec[1:].startswith(auth_str):
max_recved_idx = eval(text_dec[1:].lstrip(auth_str))
self.authenticate_success()
self.initiator.retransmit_clientconn_reload(
self, max_recved_idx)
else:
self.close()
else:
# strip off type and seq (both are always 1)
self.ping_recv(text_dec[2:])
self.buffer = recv[-1] # incomplete message
def authenticate_success(self):
self.authenticated = True
logging.debug("Authentication confirm string received.")
self.initiator.add_cli(self)
self.ping_send()
def close(self):
'''a secure way to abort the connection'''
try:
self.cronjob.cancel()
except Exception:
pass
# self.initiator.remove_cli(self)
self.transport.loseConnection()
def connectionLost(self, reason):
"""Event handler of losing the connection to the client.
Call Control to handle it.
"""
if self.authenticated:
logging.info("client connection lost: " +
addr_to_str(self.transport.getPeer()))
self.authenticated = False
self.initiator.client_lost(self.i)
def write(self, data, conn_id, index):
"""Encrypt and write data the client.
Encrypted packets should be separated by split_char.
Raw packet structure:
type (1 byte) (0 for normal data packet)
id (2 bytes)
index (6 bytes)
data
"""
if index < 100000:
index = '0' * (6 - len(str(index))) + str(index)
else:
index = str(index)
# get current time with base 36 as a string in a certain length .
to_write = self.cipher.encrypt("0" + conn_id + index + data) +\
self.split_char
logging.debug(
"sending %d bytes to client %s with id %s" %
(len(data), addr_to_str(self.transport.getPeer()), conn_id))
self.transport.write(to_write)
class ClientConnector(Protocol):
"""Handle one connection to a client.
Its functions include:
- Initiate connection to client.
- Send an authentication message to client to start transmission.
- Receive encrypted data packets from client, separated by split_char.
- Decrypt data packets. Get the ID (first 2 bytes of decrypted text).
Create a connection to HTTP proxy for each unique ID.
- Forward request to HTTP proxy. Encrypt and send back the response.
- Close connection to HTTP proxy for a given ID if a packet
of the ID with close_char is received.
"""
def __init__(self, initiator):
self.initiator = initiator
self.main_pw = self.initiator.main_pw
# control characters
# self.split_char = chr(27) + chr(28) + chr(29) + chr(30) + chr(31)
self.split_char = chr(27) + chr(28) + "%X" % struct.unpack('B', self.main_pw[-2:-1])[
0] + "%X" % struct.unpack('B', self.main_pw[-3:-2])[0] + chr(31)
self.pri = self.initiator.initiator.pri
self.client_pub = self.initiator.client_pub
self.session_pw = urandom(16)
self.cipher = AESCipher(self.session_pw, self.main_pw)
self.authenticated = False
self.buffer = ""
self.latency = 10000
self.idchar = initiator.register()
self.cronjob = None
self.cancel_job = None
def generate_auth_msg(self):
"""Generate encrypted message.
The message is in the form
server_sign(main_pw) (HEX) +
client_pub(session_pw) + id
Total length is 512 + 256 + 2 = 770 bytes
"""
hex_sign = '%X' % self.pri.sign(self.main_pw, None)[0]
pw_enc = self.client_pub.encrypt(self.session_pw, None)[0]
return hex_sign + pw_enc + self.idchar
def ping_send(self):
"""Send the initial ping message to the client at a certain interval.
Ping mechanism (S for server, C for client, t-i for i-th timestamp):
packet 0: S->C, t-0
packet 1: C->S, t-0 + t-1
packet 2: S->C, t-1
In this way, both server and client get the round-trip latency.
Packet format (before encryption):
"1" (1 byte) (type flag for ping)
seq (1 byte) (0, 1 or 2)
timestamp (11 or 22 bytes) (time in milliseconds, in hexagon)
"""
raw_packet = "1" + "0" + get_timestamp()
to_write = self.cipher.encrypt(raw_packet) + self.split_char
if self.authenticated:
#logging.debug("send ping0")
self.transport.write(to_write)
interval = random.randint(500, 1500) / 100
if self.initiator.obfs_level == 3:
RESET_INTERVAL = 5
else:
RESET_INTERVAL = 2
self.cronjob = reactor.callLater(interval, self.ping_send)
self.cancel_job = reactor.callLater(RESET_INTERVAL, self.close)
def ping_recv(self, msg):
"""Parse ping 1 (without flag & seq) and send ping 2."""
#logging.debug("recv ping1")
self.cancel_job.cancel()
time0 = parse_timestamp(msg[:11])
self.latency = int(time() * 1000) - time0
logging.debug("latency: %dms" % self.latency)
raw_packet = "1" + "2" + msg[11:]
to_write = self.cipher.encrypt(raw_packet) + self.split_char
if self.transport:
#logging.debug("send ping2")
self.transport.write(to_write)
def connectionMade(self):
"""Event handler of being successfully connected to the client."""
logging.info("connected to client " +
addr_to_str(self.transport.getPeer()))
self.transport.write(self.generate_auth_msg())
def dataReceived(self, recv_data):
"""Event handler of receiving some data from client.
Split, decrypt and hand them back to Control.
"""
# Avoid repetition caused by ping
# logging.debug("received %d bytes from client " % len(recv_data) +
# addr_to_str(self.transport.getPeer()))
self.buffer += recv_data
# a list of encrypted data packages
# the last item may be incomplete
recv = self.buffer.split(self.split_char)
# leave the last (may be incomplete) item intact
for text_enc in recv[:-1]:
text_dec = self.cipher.decrypt(text_enc)
# flag is 0 for normal data packet, 1 for ping packet
flag = int(text_dec[0])
if flag == 0:
self.initiator.client_recv(text_dec[1:])
elif flag == 2:
if text_dec[1:] == "AUTHENTICATED" + self.idchar:
self.authenticate_success()
else:
self.close()
else:
# strip off type and seq (both are always 1)
self.ping_recv(text_dec[2:])
self.buffer = recv[-1] # incomplete message
def authenticate_success(self):
self.authenticated = True
logging.debug("Authentication confirm string received.")
self.initiator.add_cli(self)
self.ping_send()
def close(self):
'''a secure way to abort the connection'''
try:
self.cronjob.cancel()
except Exception:
pass
self.transport.loseConnection()
def connectionLost(self, reason):
"""Event handler of losing the connection to the client.
Call Control to handle it.
"""
if self.authenticated:
logging.info("client connection lost: " +
addr_to_str(self.transport.getPeer()))
self.authenticated = False
self.initiator.client_lost(self)
def write(self, data, conn_id, index):
"""Encrypt and write data the client.
Encrypted packets should be separated by split_char.
Raw packet structure:
type (1 byte) (0 for normal data packet)
id (2 bytes)
index (6 bytes)
data
"""
to_write = self.cipher.encrypt("0" + conn_id + index + data) +\
self.split_char
logging.debug("sending %d bytes to client %s with id %s" % (len(data),
addr_to_str(
self.transport.getPeer()),
conn_id))
self.transport.write(to_write)
def callback(message):
if (args.mode == "verify"):
try:
logging.info("********** Start PubsubMessage ")
logging.info('Received message ID: {}'.format(message.message_id))
logging.info('Received message publish_time: {}'.format(
message.publish_time))
logging.info('Received message attributes["kms_key"]: {}'.format(
message.attributes['kms_key']))
logging.debug(
'Received message attributes["sign_key_wrapped"]: {}'.format(
message.attributes['sign_key_wrapped']))
logging.info('Received message attributes["signature"]: {}'.format(
message.attributes['signature']))
signature = message.attributes['signature']
name = message.attributes['kms_key']
sign_key_wrapped = message.attributes['sign_key_wrapped']
try:
unwrapped_key = cache[sign_key_wrapped]
logging.info("Using Cached DEK")
except KeyError:
logging.info(
">>>>>>>>>>>>>>>> Starting KMS decryption API call")
decrypted_message = kms_client.decrypt(
request={
'name':
name,
'ciphertext':
base64.b64decode(sign_key_wrapped.encode('utf-8')),
'additional_authenticated_data':
tenantID.encode('utf-8')
})
logging.info("Decrypted HMAC " +
decrypted_message.plaintext.decode('utf-8'))
unwrapped_key = HMACFunctions(
encoded_key=decrypted_message.plaintext)
logging.info(unwrapped_key.printKeyInfo())
cache[sign_key_wrapped] = unwrapped_key
logging.info("End KMS decryption API call")
logging.debug("Verify message: " +
message.data.decode('utf-8'))
logging.debug(' With HMAC: ' + signature)
sig = unwrapped_key.hash(message.data)
if (unwrapped_key.verify(message.data, base64.b64decode(sig))):
logging.info("Message authenticity verified")
message.ack()
else:
logging.error("Unable to verify message")
message.nack()
logging.debug("********** End PubsubMessage ")
except Exception as e:
logging.info("Unable to decrypt message; NACK pubsub message " +
str(e))
message.nack()
if (args.mode == "decrypt"):
try:
logging.info("********** Start PubsubMessage ")
logging.info('Received message ID: {}'.format(message.message_id))
logging.info('Received message publish_time: {}'.format(
message.publish_time))
logging.info('Received message attributes["kms_key"]: {}'.format(
message.attributes['kms_key']))
logging.info(
'Received message attributes["dek_wrapped"]: {}'.format(
message.attributes['dek_wrapped']))
dek_wrapped = message.attributes['dek_wrapped']
name = message.attributes['kms_key']
try:
dek = cache[dek_wrapped]
logging.info("Using Cached DEK")
except KeyError:
logging.info(
">>>>>>>>>>>>>>>> Starting KMS decryption API call")
decrypted_message = kms_client.decrypt(
request={
'name': name,
'ciphertext': base64.b64decode(
dek_wrapped.encode('utf-8')),
'additional_authenticated_data': tenantID.encode(
'utf-8')
})
logging.info("Decrypted DEK " +
decrypted_message.plaintext.decode('utf-8'))
dek = AESCipher(encoded_key=decrypted_message.plaintext)
logging.info(dek.printKeyInfo())
cache[dek_wrapped] = dek
logging.debug("Starting AES decryption")
decrypted_data = dek.decrypt(message.data,
associated_data=tenantID)
logging.debug("End AES decryption")
logging.info('Decrypted data ' + decrypted_data)
message.ack()
logging.debug("ACK message")
logging.info("********** End PubsubMessage ")
except Exception as e:
logging.info("Unable to decrypt message; NACK pubsub message " +
str(e))
message.nack()
def callback(message):
if (args.mode == "verify"):
logging.info("********** Start PubsubMessage ")
logging.info('Received message ID: {}'.format(message.message_id))
logging.info('Received message publish_time: {}'.format(
message.publish_time))
logging.info('Received message attributes["kms_key"]: {}'.format(
message.attributes['kms_key']))
logging.info(
'Received message attributes["sign_key_wrapped"]: {}'.format(
message.attributes['sign_key_wrapped']))
logging.info('Received message attributes["signature"]: {}'.format(
message.attributes['signature']))
signature = message.attributes['signature']
name = message.attributes['kms_key']
sign_key_wrapped = message.attributes['sign_key_wrapped']
try:
unwrapped_key = cache[sign_key_wrapped]
except KeyError:
logging.info("Starting KMS decryption API call")
name = message.attributes['kms_key']
unwrapped_key_struct = kms_client.decrypt(
name=name,
ciphertext=base64.b64decode(
message.attributes['sign_key_wrapped']),
additional_authenticated_data=tenantID.encode('utf-8'))
unwrapped_key = unwrapped_key_struct.plaintext
logging.info("End KMS decryption API call")
logging.debug("Verify message: " + message.data.decode('utf-8'))
logging.debug(' With HMAC: ' + signature)
logging.debug(' With unwrapped key: ' +
base64.b64encode(unwrapped_key).decode('utf-8'))
cache[sign_key_wrapped] = unwrapped_key
hh = HMACFunctions(unwrapped_key)
sig = hh.hash(message.data)
if (hh.verify(message.data, base64.b64decode(sig))):
logging.info("Message authenticity verified")
message.ack()
else:
logging.error("Unable to verify message")
message.nack()
logging.debug("********** End PubsubMessage ")
if (args.mode == "decrypt"):
logging.info("********** Start PubsubMessage ")
logging.info('Received message ID: {}'.format(message.message_id))
logging.debug('Received message publish_time: {}'.format(
message.publish_time))
logging.debug('Received message attributes["kms_key"]: {}'.format(
message.attributes['kms_key']))
logging.debug('Received message attributes["dek_wrapped"]: {}'.format(
message.attributes['dek_wrapped']))
dek_wrapped = message.attributes['dek_wrapped']
name = message.attributes['kms_key']
try:
dek = cache[dek_wrapped]
except KeyError:
logging.info("Starting KMS decryption API call")
name = message.attributes['kms_key']
unwrapped_key_struct = kms_client.decrypt(
name=name,
ciphertext=base64.b64decode(dek_wrapped),
additional_authenticated_data=tenantID.encode('utf-8'))
dek = unwrapped_key_struct.plaintext
logging.info("End KMS decryption API call")
logging.info('Received aes_encryption_key : {}'.format(
base64.b64encode(dek).decode('utf-8')))
cache[dek_wrapped] = dek
logging.debug("Starting AES decryption")
ac = AESCipher(dek)
decrypted_data = ac.decrypt(message.data, associated_data="")
logging.debug("End AES decryption")
logging.info('Decrypted data ' + decrypted_data)
message.ack()
logging.debug("ACK message")
logging.info("********** End PubsubMessage ")