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# Copyright 2017 Canonical Ltd.
# Licensed under the LGPLv3, see LICENCE file for details.
import nacl.public
class PrivateKey(object):
''' A private key used by the bakery to encrypt and decrypt
third party caveats.
Internally, it is a 256-bit Ed25519 private key.
'''
def __init__(self, key):
self._key = key
@property
def key(self):
''' Internal nacl key representation.
'''
return self._key
@property
def public_key(self):
'''
:return: the PublicKey associated with the private key.
'''
return PublicKey(self._key.public_key)
@classmethod
def deserialize(cls, serialized):
''' Create a PrivateKey from a base64 encoded bytes.
:return: a PrivateKey
'''
return PrivateKey(
nacl.public.PrivateKey(serialized,
encoder=nacl.encoding.Base64Encoder))
def serialize(self, raw=False):
'''Encode the private part of the key in a base64 format by default,
but when raw is True it will return hex encoded bytes.
@return: bytes
'''
if raw:
return self._key.encode()
return self._key.encode(nacl.encoding.Base64Encoder)
def __str__(self):
'''Return the private part of the key key as a base64-encoded string'''
return self.serialize().decode('utf-8')
def __eq__(self, other):
return self.key == other.key
class PublicKey(object):
''' A public key used by the bakery to encrypt third party caveats.
Every discharger is associated with a public key which is used to
encrypt third party caveat ids addressed to that discharger.
Internally, it is a 256 bit Ed25519 public key.
'''
def __init__(self, key):
self._key = key
@property
def key(self):
''' Internal nacl key representation.
'''
return self._key
def serialize(self, raw=False):
'''Encode the private part of the key in a base64 format by default,
but when raw is True it will return hex encoded bytes.
@return: bytes
'''
if raw:
return self._key.encode()
return self._key.encode(nacl.encoding.Base64Encoder)
def __str__(self):
'''Return the key as a base64-encoded string'''
return self.serialize().decode('utf-8')
@classmethod
def deserialize(cls, serialized):
''' Create a PublicKey from a base64 encoded bytes.
:return: a PublicKey
'''
return PublicKey(
nacl.public.PublicKey(serialized,
encoder=nacl.encoding.Base64Encoder))
def __eq__(self, other):
return self.key == other.key
def generate_key():
'''GenerateKey generates a new PrivateKey.
:return: a PrivateKey
'''
return PrivateKey(nacl.public.PrivateKey.generate())
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