Add a separate pubkey/privatekey for sharing.

It's separated from the login one so that encryption key and identity
can be rotated separately.

django_etesync/serializers.py

@@ -326,9 +326,12 @@ class InvitationAcceptSerializer(serializers.Serializer):
 
 
 class UserSerializer(serializers.ModelSerializer):
+    pubkey = BinaryBase64Field(source='userinfo.pubkey')
+    encryptedSeckey = BinaryBase64Field(source='userinfo.encryptedSeckey')
+
     class Meta:
         model = User
-        fields = (User.USERNAME_FIELD, User.EMAIL_FIELD)
+        fields = (User.USERNAME_FIELD, User.EMAIL_FIELD, 'pubkey', 'encryptedSeckey')
 
 
 class UserQuerySerializer(serializers.ModelSerializer):
@@ -349,6 +352,8 @@ class AuthenticationSignupSerializer(serializers.Serializer):
     user = UserQuerySerializer(many=False)
     salt = BinaryBase64Field()
     loginPubkey = BinaryBase64Field()
+    pubkey = BinaryBase64Field()
+    encryptedSeckey = BinaryBase64Field()
 
     def create(self, validated_data):
         """Function that's called when this serializer creates an item"""