Begin refactoring backfilling and preparation operations into setup and start adding encryption metadata to models

backend/src/models/secretBlindIndexData.ts

@@ -1,4 +1,9 @@
 import { Schema, model, Types, Document } from 'mongoose';
+import { 
+    ALGORITHM_AES_256_GCM,
+    ENCODING_SCHEME_UTF8,
+    ENCODING_SCHEME_BASE64
+} from '../variables';
 
 export interface ISecretBlindIndexData extends Document {
     _id: Types.ObjectId;
@@ -6,6 +11,9 @@ export interface ISecretBlindIndexData extends Document {
     encryptedSaltCiphertext: string;
     saltIV: string;
     saltTag: string;
+    algorithm: 'aes-256-gcm';
+    keySize: 256;
+    keyEncoding: 'base64' | 'utf8'
 }
 
 const secretBlindIndexDataSchema = new Schema<ISecretBlindIndexData>(
@@ -26,7 +34,26 @@ const secretBlindIndexDataSchema = new Schema<ISecretBlindIndexData>(
         saltTag: {
             type: String,
             required: true
+        },
+        algorithm: {
+            type: String,
+            enum: [ALGORITHM_AES_256_GCM],
+            required: true
+        },
+        keySize: {
+            type: Number,
+            enum: [256],
+            required: true
+        },
+        keyEncoding: {
+            type: String,
+            enum: [
+                ENCODING_SCHEME_UTF8,
+                ENCODING_SCHEME_BASE64
+            ],
+            required: true
         }
+
     }
 );