Update

backend/src/helpers/botOrg.ts

@@ -0,0 +1,46 @@
+import { Types } from "mongoose";
+import { client, getEncryptionKey, getRootEncryptionKey } from "../config";
+import { BotOrg } from "../models";
+import { decryptSymmetric128BitHexKeyUTF8 } from "../utils/crypto";
+import {
+    ENCODING_SCHEME_BASE64,
+    ENCODING_SCHEME_UTF8
+} from "../variables";
+import { InternalServerError } from "../utils/errors";
+
+// TODO: DOCstrings
+
+export const getSymmetricKeyHelper = async (organizationId: Types.ObjectId) => {
+    const rootEncryptionKey = await getRootEncryptionKey();
+    const encryptionKey = await getEncryptionKey();
+
+    const botOrg = await BotOrg.findOne({
+        organization: organizationId
+    });
+    
+    if (!botOrg) throw new Error("Failed to find organization bot");
+
+    if (rootEncryptionKey && botOrg.symmetricKeyKeyEncoding == ENCODING_SCHEME_BASE64) {
+        const key = client.decryptSymmetric(
+            botOrg.encryptedSymmetricKey, 
+            rootEncryptionKey, 
+            botOrg.symmetricKeyIV, 
+            botOrg.symmetricKeyTag
+        );
+
+        return key;
+    } else if (encryptionKey && botOrg.symmetricKeyKeyEncoding === ENCODING_SCHEME_UTF8) {
+       const key = decryptSymmetric128BitHexKeyUTF8({
+            ciphertext: botOrg.encryptedSymmetricKey,
+            iv: botOrg.symmetricKeyIV,
+            tag: botOrg.symmetricKeyTag,
+            key: encryptionKey
+        });
+        
+        return key;
+    }
+
+    throw InternalServerError({
+        message: "Failed to match encryption key with organization bot symmetric key encoding"
+    });
+}