From d3ed6d81900766ec53547623ac3e59a537fa2179 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Sun, 3 Jan 2021 15:07:54 +0100
Subject: crxmake: support 1024 and 4096 bit RSA keys

From: https://stackoverflow.com/questions/18693962/pack-chrome-extension-on-server-with-only-command-line-interface/18709204#comment100718141_18709204
---
 crxmake | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/crxmake b/crxmake
index 9418f83..066ef60 100755
--- a/crxmake
+++ b/crxmake
@@ -16,6 +16,11 @@ zip="$name.zip"
 tosign="$name.presig"
 binary_crx_id="$name.crxid"
 
+key_size=$(
+  openssl rsa -text -noout -in "$key" |
+  sed -n 's/^.*Private-Key:.*\<\([0-9]\+\)\>\s*bit.*$/\1/p'
+)
+
 workdir=$(mktemp -d -t crxmake.XXXXXXXX)
 oldworkdir=$PWD
 cd "$workdir"
@@ -47,9 +52,26 @@ openssl rsa -pubout -outform DER < "$key" > "$pub" 2>/dev/null
 
 crmagic_hex="43 72 32 34" # Cr24
 version_hex="03 00 00 00" # 3
-header_length="45 02 00 00"
-header_chunk_1="12 AC 04 0A A6 02"
-header_chunk_2="12 80 02"
+case $key_size in
+  1024)
+    header_length="41 01 00 00"
+    header_chunk_1="12 A8 02 0A A2 01"
+    header_chunk_2="12 80 01"
+  ;;
+  2048)
+    header_length="45 02 00 00"
+    header_chunk_1="12 AC 04 0A A6 02"
+    header_chunk_2="12 80 02"
+  ;;
+  4096)
+    header_length="45 04 00 00"
+    header_chunk_1="12 AC 08 0A A6 04"
+    header_chunk_2="12 80 04"
+  ;;
+  *)
+    echo "Error: $key has unsupported key size: $key_size" >&2
+    exit 2
+esac
 header_chunk_3="82 F1 04 12 0A 10"
 (
   echo "$crmagic_hex $version_hex $header_length $header_chunk_1" | xxd -r -p
-- 
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