From e8a8e483da6d2a89bd2823d85b75a910331be841 Mon Sep 17 00:00:00 2001
From: M66B <M66B@users.noreply.github.com>
Date: Tue, 14 Feb 2023 08:22:17 +0100
Subject: [PATCH] Native DKIM: process body text length

---
 app/src/main/java/eu/faircode/email/MessageHelper.java | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/app/src/main/java/eu/faircode/email/MessageHelper.java b/app/src/main/java/eu/faircode/email/MessageHelper.java
index 525af2c23c..26dfe0520f 100644
--- a/app/src/main/java/eu/faircode/email/MessageHelper.java
+++ b/app/src/main/java/eu/faircode/email/MessageHelper.java
@@ -2132,6 +2132,15 @@ public class MessageHelper {
                     } else
                         throw new IllegalArgumentException(c[1]);
 
+                    String length = kv.get("l");
+                    if (!TextUtils.isEmpty(length) && TextUtils.isDigitsOnly(length)) {
+                        int l = Integer.parseInt(length);
+                        if (l < 100)
+                            throw new IllegalArgumentException("Body length " + l + " < 100");
+                        if (l < body.length())
+                            body = body.substring(0, l);
+                    }
+
                     Log.i("DKIM body=" + body.replace("\r\n", "|"));
 
                     byte[] bh = MessageDigest.getInstance(halgo).digest(body.getBytes());  // TODO: charset?