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#! /bin/sh
# Get CRX id from RSA key or CRX3 file
# usage: crxid FILE
set -efu
path=$1
type=$(file -b "$path")
case $type in
'Google Chrome extension, version 3')
# For details about CRX3 format see
# https://chromium.googlesource.com/chromium/src/+/HEAD/components/crx_file/crx3.proto
header_length=$(od -An -j8 -N4 -tu4 "$path")
binary_crx_id_length=16
binary_crx_id_offset=$(expr 12 + $header_length - $binary_crx_id_length)
crx_id_hexstring=$(
od -An -j"$binary_crx_id_offset" -N"$binary_crx_id_length" -tx1 "$path" |
tr a-f A-F |
tr -d ' '
)
;;
'PEM RSA private key')
digest=$(
openssl rsa -in "$path" -pubout -outform der 2>/dev/null |
openssl dgst -sha256 -hex |
sed 's/^(stdin)= //;s/.*/\U&/'
)
crx_id_hexstring=$(
echo "$digest" | cut -b-32
)
;;
*)
echo "crxid: error: $path has unsupported type: $type" >&2
exit 1
esac
script="
obase=16;
ibase=16;
ascii_a=61;
$(echo $crx_id_hexstring | sed 's/./ascii_a + &;/g')
"
crx_id=$(echo "$script" | bc | xxd -r -p)
echo "$crx_id"
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