Move to NextJS + other changes

src/app/util/Encryption.ts

@@ -0,0 +1,45 @@
+import CryptoJS from 'crypto-js'
+import { getKey } from './KeysHelper'
+
+export async function encrypt (
+  plainText: string,
+  key?: string
+): Promise<string> {
+  if (!key) key = await getKey(1)
+  const iv = CryptoJS.lib.WordArray.random(16)
+  const encrypted = CryptoJS.AES.encrypt(
+    plainText,
+    CryptoJS.enc.Utf8.parse(key),
+    {
+      iv,
+      mode: CryptoJS.mode.CBC,
+      padding: CryptoJS.pad.Pkcs7
+    }
+  )
+  const combined = iv.concat(encrypted.ciphertext)
+  return CryptoJS.enc.Base64.stringify(combined)
+}
+
+export async function decrypt (dataB64: string, key?: string): Promise<string> {
+  if (!key) key = await getKey(0)
+  const data = CryptoJS.enc.Base64.parse(dataB64)
+  const iv = CryptoJS.lib.WordArray.create(data.words.slice(0, 4), 16)
+  const ciphertext = CryptoJS.lib.WordArray.create(
+    data.words.slice(4),
+    data.sigBytes - 16
+  )
+  const cipherParams = CryptoJS.lib.CipherParams.create({ ciphertext })
+
+  const decrypted = CryptoJS.AES.decrypt(
+    cipherParams,
+    CryptoJS.enc.Utf8.parse(key),
+    {
+      iv,
+      mode: CryptoJS.mode.CBC,
+      padding: CryptoJS.pad.Pkcs7
+    }
+  )
+  const result = decrypted.toString(CryptoJS.enc.Utf8)
+  if (!result) throw new Error(await encrypt('-997'))
+  return result
+}