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- #!/bin/bash -e
- #
- # Purpose: Pack a Chromium extension directory into crx format
- if test $# -ne 2; then
- echo "Usage: crxmake.sh <extension dir> <pem path>"
- exit 1
- fi
- dir=$1
- key=$2
- name=$(basename "$dir")
- crx="$name.crx"
- pub="$name.pub"
- sig="$name.sig"
- zip="$name.zip"
- trap 'rm -f "$pub" "$sig" "$zip"' EXIT
- # zip up the crx dir
- cwd=$(pwd -P)
- (cd "$dir" && zip -qr -9 -X "$cwd/$zip" .)
- # signature
- openssl sha1 -sha1 -binary -sign "$key" < "$zip" > "$sig"
- # public key
- openssl rsa -pubout -outform DER < "$key" > "$pub" 2>/dev/null
- byte_swap () {
- # Take "abcdefgh" and return it as "ghefcdab"
- echo "${1:6:2}${1:4:2}${1:2:2}${1:0:2}"
- }
- crmagic_hex="4372 3234" # Cr24
- version_hex="0200 0000" # 2
- pub_len_hex=$(byte_swap $(printf '%08x\n' $(ls -l "$pub" | awk '{print $5}')))
- sig_len_hex=$(byte_swap $(printf '%08x\n' $(ls -l "$sig" | awk '{print $5}')))
- (
- echo "$crmagic_hex $version_hex $pub_len_hex $sig_len_hex" | xxd -r -p
- cat "$pub" "$sig" "$zip"
- ) > "$crx"
- echo "Wrote $crx"
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