def serialise(self, signing_key: SigningKey):
# Create buffer
buffer = BytesIO()
# Write magic number
buffer.write(Frame.MAGIC_NUMBER)
# Write the destination key
buffer.write(self.destination.serialise().read())
# Write the origin key
buffer.write(self.origin.serialise().read())
# Write the via field
buffer.write(self.via.serialise().read())
# Create a box to send the signed data in
box = SealedBox(self.destination.public_key)
# Sign the payload
signed = signing_key.sign(self.payload.read())
# Encrypt and write the data to the buffer
buffer.write(box.encrypt(signed))
# Rewind the buffer
buffer.seek(0, 0)
# Return the buffer
return buffer
def _poll_handshake_file(self):
"""Check if a client has created a handshake file. If so, parse the file and store
the session key"""
# check for file with valid name
with self.xmit_lock:
files = list_files(self.ftps)
for f in files:
s_id, direction, seq = parse_tunnel_filename(f[0])
if s_id is not None and direction == 0 and seq == 0:
# check if contents of file is encrypted with this proxy's public key
data = get_file_contents(self.ftps, f[0])
try:
# attempt to decrypt the received message
unseal_box = SealedBox(self.private_key)
self.session_key = unseal_box.decrypt(data)
self.session_id = s_id
return
except Exception as e:
# file contents not encrypted with proxy's key
continue
# update heartbeat if needed
if self.heart + PROXY_HEARTBEAT_TIMEOUT < time.time():
upload_binary_data(self.ftps, self.my_proxy_id, generate_proxy_descriptor(self.public_key))
self.heart = time.time()
async def test_valid_auth_code_ecn_token():
privateKeyHex = 'd686cb5b1e7866c657af66b6c365dd8f1523678dbf1a9d0344c5e9c38847c034'
publicKeyHex = '34a0d7e2c95b24c9c87e47ce4e528c3814a8516528b4095c84b49908390b7a24'
nbf = time.mktime(datetime.datetime(2020, 4, 1, 00, 00).timetuple())
exp = time.mktime(datetime.datetime(2020, 4, 1, 23, 59).timetuple())
payload = {
'grant-type': 'auth_code',
'grant': 'shared_secret_key',
'metadata': json.dumps({
'aud': 'sofie-iot.eu',
'nbf': nbf,
'exp': exp
}),
'enc-key': publicKeyHex
}
response = requests.post("http://localhost:9001/gettoken",
data=payload).text
response = json.loads(response)
enc64 = response['message']
enc = base64.urlsafe_b64decode(enc64)
private_key = nacl.public.PrivateKey(privateKeyHex,
nacl.encoding.HexEncoder)
sealed_box = SealedBox(private_key)
msg = sealed_box.decrypt(enc)
assert (response['code'] == 200)
def _retrieve_service_generated_cert(self, request, dek_info):
"""
:param CertificateRequest request:
:param EdgeEncryptionKey dek_info:
:rtype: Certificate
"""
box = SealedBox(dek_info.public_key)
encrypted_key_pass = box.encrypt(request.key_password)
body = {
'exportFormat':
'PEM',
'encryptedPrivateKeyPassphrase':
base64.b64encode(encrypted_key_pass).decode('utf-8'),
'encryptedKeystorePassphrase':
'',
'certificateLabel':
''
}
url = URLS.CERTIFICATE_KEYSTORE_BY_ID.format(request.cert_guid)
status, data = self._post(url, data=body)
if status not in (HTTPStatus.OK, HTTPStatus.CREATED,
HTTPStatus.ACCEPTED):
log.error("Some error")
raise VenafiError
cert, chain, private_key = zip_to_pem(data, request.chain_option)
return Certificate(cert=cert, chain=chain, key=private_key)
def handle(self, *args, **options): # pylint: disable=too-many-locals, too-many-branches, too-many-statements
if options['key'] is None:
options['key'] = getpass.getpass('Enter private key: ')
box = SealedBox(PrivateKey(base64.b64decode(options['key'])))
original_path = options['file']
try:
with open(original_path, 'rb') as original_file:
print('Decrypting ' + str(original_path) + '...')
try:
cleartext = box.decrypt(original_file.read())
filename = original_path.replace('.encrypted', '')
with open(filename, 'wb') as file_obj:
file_obj.write(cleartext)
print('Decrypted ' + str(original_path) + ' to ' +
filename + '.')
except CryptoError:
print('Unable to decrypt ' + str(original_path) +
' (CryptoError). Please investigate manually.')
if options['file_pk'] > 0:
traceback.print_exc()
except MemoryError:
print('Unable to decrypt ' + str(original_path) +
' (MemoryError). Please investigate manually.')
except IOError:
traceback.print_exc()
print('Unable to decrypt ' + str(original_path) +
' (IOError). Please investigate manually.')
def test_sealed_box_decryption(privalice, pubalice, plaintext, encrypted):
pubalice = PublicKey(pubalice, encoder=HexEncoder)
privalice = PrivateKey(privalice, encoder=HexEncoder)
box = SealedBox(privalice)
decrypted = box.decrypt(encrypted, encoder=HexEncoder,)
assert binascii.hexlify(decrypted) == plaintext
def generate_token(self,
private_key,
metadata=None,
enc_key=None,
token_type=None):
claims = {}
metadata = json.loads(metadata)
#create token_id
if 'aud' in metadata:
claims['aud'] = metadata['aud']
if 'sub' in metadata:
claims['sub'] = metadata['sub']
if 'exp' in metadata:
claims['exp'] = metadata['exp']
if 'nbf' in metadata:
claims['nbf'] = metadata['nbf']
claims['jti'] = random.getrandbits(256)
token = jwt.encode(claims, private_key, algorithm='RS256')
if enc_key:
public_key = nacl.public.PublicKey(enc_key,
nacl.encoding.HexEncoder)
sealed_box = SealedBox(public_key)
token = sealed_box.encrypt(token)
token = base64.urlsafe_b64encode(token)
#return 200, {'code':200,'message':token.decode('utf-8')}
return token, claims
def rx_privatemessage(self):
print("privatemessage api called")
target_username = cherrypy.request.json["target_username"]
print("received: " + target_username)
print("actual: " + username)
target_pubkey = cherrypy.request.json["target_pubkey"]
print("received: " + target_pubkey)
print("actual: " + pubkey_hex_str)
time_str = str(time.time())
if (username == target_username and pubkey_hex_str == target_pubkey):
certificate = cherrypy.request.json["loginserver_record"]
sender_username = certificate[0:7]
try:
private_key_curve = signing_key.to_curve25519_private_key()
unseal_box = SealedBox(private_key_curve)
message_encrypted = bytes(
cherrypy.request.json["encrypted_message"],
encoding='utf-8')
message_decrypted = unseal_box.decrypt(
message_encrypted, encoder=nacl.encoding.HexEncoder)
message = message_decrypted.decode('utf-8')
print(message)
database.add_message(username, sender_username, message,
time_str)
return {'response': 'ok'}
except nacl.exceptions.CryptoError:
return {'response': 'not decrypted'}
return {'response': 'wrong target user'}
def _box():
try:
nonce = nacl.utils.random(Box.NONCE_SIZE)
box = SealedBox(PublicKey(pubKey))
return box.encrypt(msg, nonce)
except Exception:
return
def read_secret_msg(receiver_private_key, msg):
try:
key = receiver_private_key.to_curve25519_private_key()
unseal_box = SealedBox(key)
return unseal_box.decrypt(msg)
except nacl.exceptions.CryptoError:
return "wrong secret key"
def generate_zos_keys(self, node_public_key):
"""
Generate a new set of wireguard key pair and encrypt
the private side using the public key of a 0-OS node.
This implementation match the format 0-OS except to be able
to read wireguard keys into network reservations.
:param node_public_key: hex encoded public key of 0-OS node.
This is the format you find in the explorer
:type node_public_key: str
:return: tuple containing 3 fields (private key, private key encrypted, public key)
:rtype: typle
"""
wg_private_base64, wg_public_base64 = self.generate_key_pair()
node_public_bin = j.data.hash.hex2bin(node_public_key)
node_public = VerifyKey(node_public_bin)
box = SealedBox(node_public.to_curve25519_public_key())
wg_private_encrypted = box.encrypt(wg_private_base64)
wg_private_encrypted_hex = j.data.hash.bin2hex(wg_private_encrypted)
return (wg_private_base64.decode(), wg_private_encrypted_hex.decode(),
wg_public_base64.decode())
def decrypt():
encrypted_bin = read_file('encrypted.txt', True)
secret_key_bin = read_file('secret_key.txt', True)
secret_key = PrivateKey(secret_key_bin)
sealed_box = SealedBox(secret_key)
decrypted_bin = sealed_box.decrypt(encrypted_bin)
decrypted_utf8 = decrypted_bin.decode('utf-8')
write_file("decrypted.txt", decrypted_utf8)
def encrypt():
decrypted_utf8 = read_file('decrypted.txt')
decrypted_bin = bytes(decrypted_utf8, 'utf-8')
public_key_bin = read_file('public_key.txt', True)
public_key = PublicKey(public_key_bin)
sealed_box = SealedBox(public_key)
encrypted_bin = sealed_box.encrypt(decrypted_bin)
write_file("encrypted.txt", encrypted_bin, True)
def encrypt_sealed_box(message, public_rec):
message = message.encode('utf-8')
public_rec = check_key(public_rec)
public_rec = bytes.fromhex(public_rec)
public_rec = PublicKey(public_key=public_rec)
sealed_box = SealedBox(public_rec)
encrypted = sealed_box.encrypt(message)
return base64.b64encode(encrypted).decode('utf-8')
def decrypt_sealed_box(encrypted, secret):
secret = check_key(secret)
secret = bytes.fromhex(secret)
secret = PrivateKey(private_key=secret)
unseal_box = SealedBox(secret)
encrypted = base64.b64decode(encrypted)
plaintext = unseal_box.decrypt(encrypted)
return plaintext.decode('utf-8')
def encrypt_password(password, public_key):
node_public_bin = j.data.hash.hex2bin(public_key)
node_public = VerifyKey(node_public_bin)
box = SealedBox(node_public.to_curve25519_public_key())
pasword_encrypted = box.encrypt(password.encode())
pasword_encrypted_hex = j.data.hash.bin2hex(pasword_encrypted)
return pasword_encrypted_hex
def encrypt(message, key, output):
message_bytes = message.encode('ascii')
with open(key, mode="rb") as key_file:
key_bytes = key_file.read()
with open(output, "wb") as output_file:
pub_key = PublicKey(key_bytes)
sealed_box = SealedBox(pub_key)
output_file.write(sealed_box.encrypt(message_bytes))
def privateMessage(self, message, targetUsername, apiKey, prikey):
#self, message, targetusername, apikey, prikey
client_saved_at = str(time.time())
sqlite.insertPM(self, self.username, targetUsername, self.username,
targetUsername, message, client_saved_at)
data = sqlite.getOnline(self)
for i in range(len(data["name"])):
if (data["name"][i] == targetUsername):
address = data["address"][i]
url = "http://" + address + "/api/rx_privatemessage"
loginserver_record = self.LoginServerRecord(apiKey)
target_pubkey = str(sqlite.findOnline(self, str(targetUsername)))
print(target_pubkey)
pubkey = nacl.signing.VerifyKey(target_pubkey,
encoder=nacl.encoding.HexEncoder)
curvedrxpubkey = pubkey.to_curve25519_public_key()
sealed_box = SealedBox(curvedrxpubkey)
message = bytes(message, encoding='utf-8')
encrypted = sealed_box.encrypt(message,
encoder=nacl.encoding.HexEncoder)
signed = bytes(loginserver_record + target_pubkey + targetUsername +
encrypted.decode('utf-8') + client_saved_at,
encoding='utf-8')
signature = prikey.sign(signed, encoder=nacl.encoding.HexEncoder)
headers = {
'X-username': self.username,
'X-apikey': apiKey,
'Content-Type': 'application/json; charset=utf-8',
}
payload = {
"loginserver_record": loginserver_record,
"target_pubkey": target_pubkey,
"target_username": targetUsername,
"encrypted_message": encrypted.decode('utf-8'),
"sender_created_at": client_saved_at,
"signature": signature.signature.decode('utf-8')
}
payload_str = json.dumps(payload)
json_payload = payload_str.encode("utf-8")
try:
req = urllib.request.Request(url,
data=json_payload,
headers=headers)
response = urllib.request.urlopen(req)
data = response.read()
encoding = response.info().get_content_charset('utf-8')
response.close()
except urllib.error.HTTPError as error:
print("$$$$$$$$$$$$$$$$$$")
print(error.read())
exit()
print("##############33")
print(data)
print("#################")
JSON_object = json.loads(str(data.decode(encoding)))
print(JSON_object)
def test_sealed_box_public_key_cannot_decrypt(_privalice, pubalice,
_plaintext, encrypted):
pubalice = PublicKey(pubalice, encoder=HexEncoder)
box = SealedBox(pubalice)
with pytest.raises(TypeError):
box.decrypt(
encrypted,
encoder=HexEncoder,
)
def decrypt(self, data, hex=False):
""" Decrypt incoming data using the private key
:param data: encrypted data provided
@return decrypted data
"""
unseal_box = SealedBox(self.privkey)
if hex:
data = self._hex_to_bin(data)
return unseal_box.decrypt(data)
def payload_encrypt_pubkey(self, payload, verifykey=None, hex=False):
assert verifykey
pubkey = self.pubkey_obj_get(verifykey)
sealed_box = SealedBox(pubkey)
res = sealed_box.encrypt(payload)
if hex:
res = self._bin_to_hex(res)
return res
def auth():
auth_host = '10.50.8.128'
#with open('private_key', 'rb') as f:
#f.write('Hello\n')
with open('private_key') as f:
encoded_private_key = f.read()
with open('public_key') as f:
encoded_public_key = f.read()
loaded_public_key = PublicKey(encoded_public_key,
encoder=nacl.encoding.Base64Encoder)
loaded_private_key = PrivateKey(encoded_private_key,
encoder=nacl.encoding.Base64Encoder)
# assert loaded_public_key.encode() == loaded_private_key.public_key.encode()
#assert loaded_public_key.encode() == loaded_private_key.public_key.encode()
print(loaded_public_key.encode())
print(loaded_private_key.public_key.encode())
private_key = loaded_private_key
public_key = loaded_public_key
# return 1
# private_key = private_key_b64.decode('base64')
# public_key = public_key_b64.decode('base64')
# with open('public_key', 'rb') as f:
# f.write(encoded_public_key)
# with open('x.py') as f: s = f.read()
# # Generate Bob's private key, as we've done in the Box example
# skbob = PrivateKey.generate()
# pkbob = skbob.public_key
#return private_key
# Alice wishes to send a encrypted message to Bob,
# but prefers the message to be untraceable
#sealed_box = SealedBox(pkbob)
sealed_box = SealedBox(private_key)
# This is Alice's message
message = b"Kill all kittens"
# Encrypt the message, it will carry the ephemeral key public part
# to let Bob decrypt it
encrypted = sealed_box.encrypt(message)
msg = base64.b64encode(encrypted)
msg = encoded_public_key
#data = {'name': 'jtest', 'ipaddr': '192.168.0.2' 'public_key': b'\x8e\x05{\xe2\xcby:\x0b\xeb\xe69\xac|\x96\xff\xa4\xdaE\x89^\xa7\xaf\x90\x83\x14)bP\x0c\n\x85l'}
#data = {'msg': ''}
data = {'msg': msg}
print(data)
#return 1
#r = requests.post('https://stats.rchain.me:30443/auth', data = data)
r = requests.post(f'https://{auth_host}:30443/auth', data=data)
print(r)
text = r.text
content = r.content
print(text)
print(content)
def test_sealed_box_too_short_msg():
empty_plaintext = b''
k = PrivateKey.generate()
enc_box = SealedBox(k.public_key)
dec_box = SealedBox(k)
msg = enc_box.encrypt(empty_plaintext)
with pytest.raises(CryptoError):
dec_box.decrypt(msg[:-1])
def account_register(args):
username = get_username(args)
if not args.public:
server_verifykey = get_server_advertised_verifykey(args.address)
else:
server_verifykey = VerifyKey(args.public, URLSafeBase64Encoder)
print(f"Server verification key: {server_verifykey.encode(URLSafeBase64Encoder).decode()}")
server_publickey = get_server_verified_publickey(args.address, server_verifykey)
# step 1: check access to homeserver
server_name = get_server_name(args.address, server_verifykey)
print(f"Server name: {server_name}")
device_storage = LocalStorage('device', readonly=True)
user_storage = LocalStorage(username, readonly=False)
with user_storage as us, device_storage as ds:
print(f"Setting identity '{username}' homeserver...")
us['homeserver'] = {
"address": args.address,
"verify": server_verifykey.encode(URLSafeBase64Encoder).decode(),
"public": server_publickey.encode(URLSafeBase64Encoder).decode(),
"timestamp": get_timestamp_seconds()
}
us.save() # write changes before profile block:
pb = _build_profile_block(username)
# pack it:
packd = msgpack.packb(pb)
# sign it:
packd_withsig = _get_user_signingkey(username).sign(packd)
# since the server might not know us yet, we have to SealedBox:
sbox = SealedBox(server_publickey)
encrypted = sbox.encrypt(packd_withsig)
# generate a signature for the headers:
request_signature = _get_user_signingkey(username).sign(encrypted).signature
# ready to submit the request:
r = requests.post(
args.address + "/api/v1/account/register",
data=encrypted,
headers={
"KF-Client-Verify": _get_user_verifykey(username).encode(URLSafeBase64Encoder).decode(),
"KF-Client-Signature": base64.urlsafe_b64encode(request_signature),
}
)
if not r.ok:
print(f"Error registering:\n{r.text}")
# r.raise_for_status()
return
# box is authenticated, no need to check server signature here
s_box = _get_homeserver_box(username)
response_bytes = s_box.decrypt(r.content)
unpacked = msgpack.unpackb(response_bytes)
print(f"Server good response: {unpacked}")
print(f"Successfully registered with homeserver.")
def createGroup(self, prikey, apiKey):
url = "http://172.23.2.31:10050/api/rx_groupinvite"
target = "misl000"
loginserverRecord = self.LoginServerRecord(apiKey)
str_pass = str("ikea")
byte = bytes(str_pass, encoding='utf-8')
key_password = str_pass * 16
salt = bytes(key_password.encode('utf-8')[:16])
ops = nacl.pwhash.argon2i.OPSLIMIT_SENSITIVE
mem = nacl.pwhash.argon2i.MEMLIMIT_SENSITIVE
key = nacl.pwhash.argon2i.kdf(32, byte, salt, ops, mem)
hashed = nacl.hash.sha256(key, encoder=nacl.encoding.HexEncoder)
hashed = hashed.decode('utf-8')
pubkey = str(sqlite.findOnline(self, str(target)))
public = nacl.signing.VerifyKey(pubkey,
encoder=nacl.encoding.HexEncoder)
curvedpubkey = public.to_curve25519_public_key()
box = SealedBox(curvedpubkey)
encrypted_groupkey = box.encrypt(key, encoder=nacl.encoding.HexEncoder)
encrypted_groupkey = encrypted_groupkey.decode('utf-8')
sender_created_at = str(time.time())
signature = bytes(loginserverRecord + hashed + pubkey + target +
encrypted_groupkey + sender_created_at,
encoding='utf-8')
signed = prikey.sign(signature, encoder=nacl.encoding.HexEncoder)
headers = {
'X-username': self.username,
'X-apikey': apiKey,
'Content-Type': 'application/json; charset=utf-8',
}
payload = {
'loginserver_record': loginserverRecord,
'groupkey_hash': hashed,
'target_pubkey': pubkey,
'target_username': self.username,
'encrypted_groupkey': encrypted_groupkey,
'sender_created_at': sender_created_at,
'signature': signed.signature.decode('utf-8')
}
payload_str = json.dumps(payload)
json_payload = payload_str.encode("utf-8")
try:
req = urllib.request.Request(url,
data=json_payload,
headers=headers)
response = urllib.request.urlopen(req)
data = response.read()
encoding = response.info().get_content_charset('utf-8')
response.close()
except urllib.error.HTTPError as error:
print(error.read())
exit()
JSON_object = json.loads(data.decode(encoding))
print(JSON_object)
return JSON_object
def test_sealed_box_zero_length_plaintext():
empty_plaintext = b''
k = PrivateKey.generate()
enc_box = SealedBox(k.public_key)
dec_box = SealedBox(k)
msg = enc_box.encrypt(empty_plaintext)
decoded = dec_box.decrypt(msg)
assert decoded == empty_plaintext
def encrypt_text(self, text: str):
if not self.public_key:
self.import_public_key_from_file()
if not self.public_key:
raise AttributeError(
'No public key known. Import public key first!')
else:
sealed_box = SealedBox(self.public_key)
cipher_byte = sealed_box.encrypt(str.encode(text))
return f'crypt:{self._base64(cipher_byte)}'
def test_sealed_box_decryption(privalice, pubalice, plaintext, encrypted):
pubalice = PublicKey(pubalice, encoder=HexEncoder)
privalice = PrivateKey(privalice, encoder=HexEncoder)
box = SealedBox(privalice)
decrypted = box.decrypt(
encrypted,
encoder=HexEncoder,
)
assert binascii.hexlify(decrypted) == plaintext
def test_sealed_box_public_key_cannot_decrypt(_privalice, pubalice,
_plaintext, encrypted):
pubalice = PublicKey(pubalice, encoder=HexEncoder)
box = SealedBox(pubalice)
with pytest.raises(TypeError):
box.decrypt(
encrypted,
encoder=HexEncoder,
)
def decrypt(self, secret="", message="", words="", interactive=False):
"""
use output from encrypt
js_shell 'j.data.nacl.decrypt()'
"""
if interactive:
secret, words = self._remember_get(secret, words)
if not secret:
secret = j.tools.console.askPassword("your secret")
if not message:
message = j.tools.console.askMultiline(
"your message to decrypt")
message = message.strip()
if not words:
yn = j.tools.console.askYesNo(
"do you wan to specify secret key as bip39 words?")
if yn:
words = j.tools.console.askString("your bip39 words")
else:
if not secret or not message:
raise RuntimeError("secret or message needs to be used")
secret = j.data.hash.md5_string(secret)
secret = bytes(secret, 'utf-8')
if not j.data.types.bytes.check(message):
message = bytes(message, 'utf8')
message = base64.decodestring(message)
if words == "":
words = j.data.nacl.default.words
privkeybytes = j.data.encryption.mnemonic.to_entropy(words)
pk = PrivateKey(privkeybytes)
sb = SealedBox(pk)
message = sb.decrypt(message)
# now decrypt symmetric
box = nacl.secret.SecretBox(secret)
message = box.decrypt(message)
message = message.decode(encoding='utf-8', errors='strict')
if interactive:
print("decrypted text:\n*************\n")
print(message.strip() + "\n")
return message
def encrypt(self, data, hex=False):
""" Encrypt data using the public key
:param data: data to be encrypted, should be of type binary
@return: encrypted data
"""
data = self.tobytes(data)
sealed_box = SealedBox(self.pubkey)
res = sealed_box.encrypt(data)
if hex:
res = self._bin_to_hex(res)
return res
def asymmetrically_decrypt(text, sk):
"""
:param text: hexadecimal string to be decrypted
:param sk: private key [binary] from file
:return:
"""
private_key = PrivateKey(sk)
sealed_box = SealedBox(private_key)
return sealed_box.decrypt(text, encoder=encoding.HexEncoder)
def test_sealed_box_creation():
pub = PublicKey(
b"ec2bee2d5be613ca82e377c96a0bf2220d823ce980cdff6279473edc52862798",
encoder=HexEncoder,
)
priv = PrivateKey(
b"5c2bee2d5be613ca82e377c96a0bf2220d823ce980cdff6279473edc52862798",
encoder=HexEncoder,
)
SealedBox(priv)
SealedBox(pub)
def asymmetrically_encrypt(text, pk):
"""
:param text: bytestring to be encrypted
:param pk: binary public key (from file)
:return: encrypted word as hexadecimal string
"""
public_key = PublicKey(pk)
sealed_box = SealedBox(public_key)
encrypted_bytestring = sealed_box.encrypt(text.encode('utf-8'),
encoder=encoding.HexEncoder)
return str(encrypted_bytestring, "utf-8")
def test_sealed_box_encryption(privalice, pubalice, plaintext, _encrypted):
pubalice = PublicKey(pubalice, encoder=HexEncoder)
privalice = PrivateKey(privalice, encoder=HexEncoder)
box = SealedBox(pubalice)
encrypted = box.encrypt(
binascii.unhexlify(plaintext),
encoder=HexEncoder,
)
assert encrypted != _encrypted
# since SealedBox.encrypt uses an ephemeral sender's keypair
box2 = SealedBox(privalice)
decrypted = box2.decrypt(
encrypted,
encoder=HexEncoder,
)
assert binascii.hexlify(decrypted) == plaintext
assert bytes(box) == bytes(box2)
def decrypt(s_b64, sk_b64):
box = SealedBox(PrivateKey(base64.b64decode(sk_b64)))
dec = box.decrypt(base64.urlsafe_b64decode(s_b64))
return(dec)
