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import libnacl
import libnacl.public
import libnacl.dual
class SealedBox(object):
'''
Sealed box is a variant of Box that does not authenticate sender.
'''
def __init__(self, pk, sk=None):
self.pk = pk
self.sk = sk
if isinstance(pk, (libnacl.public.SecretKey, libnacl.dual.DualSecret)):
self.pk = pk.pk
self.sk = pk.sk
if isinstance(pk, libnacl.public.PublicKey):
self.pk = pk.pk
def encrypt(self, msg):
'''
Encrypt the given message using the receiver's public key
'''
return libnacl.crypto_box_seal(msg, self.pk)
def decrypt(self, msg):
'''
Decrypt the given message using the receiver's public and private key
'''
if not self.sk:
raise ValueError('Secret key is not set')
return libnacl.crypto_box_seal_open(msg, self.pk, self.sk)
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