Merge pull request #2171 from nextcloud/backport_e2e_iv

Backport e2e iv

src/main/java/com/owncloud/android/utils/EncryptionUtils.java

@@ -514,7 +514,7 @@ public static String encryptPrivateKey(String privateKey, String keyPhrase) thro
         byte[] bytes = encodeStringToBase64Bytes(privateKey);
         byte[] encrypted = cipher.doFinal(bytes);
 
-        byte[] iv = cipher.getParameters().getParameterSpec(IvParameterSpec.class).getIV();
+        byte[] iv = cipher.getIV();
         String encodedIV = encodeBytesToBase64String(iv);
         String encodedSalt = encodeBytesToBase64String(salt);
         String encodedEncryptedBytes = encodeBytesToBase64String(encrypted);