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/migrations/0006_auto_20200526_1040.py

@@ -0,0 +1,25 @@
+# Generated by Django 3.0.3 on 2020-05-26 10:40
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('django_etesync', '0005_auto_20200526_1021'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='userinfo',
+            name='encryptedSeckey',
+            field=models.BinaryField(default=b'', editable=True),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='userinfo',
+            name='pubkey',
+            field=models.BinaryField(default=b'', editable=True),
+            preserve_default=False,
+        ),
+    ]