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- #!/bin/sh
- # SPDX-License-Identifier: BSD-3-Clause
- usage() {
- cat <<EOF
- Splices ondie-CA intermediate certificate from DER encoding to PEM.
- Usage: $0 [options] FILE
- Options:
- -h print this help text.
- EOF
- exit 0
- }
- while getopts ":h" opt; do
- case $opt in
- h)
- usage
- ;;
- \?)
- echo "Invalid option: -$OPTARG" >&2
- exit 1
- ;;
- esac
- done
- if [ "$#" -ne 1 ]; then
- (>&2 echo "Error: expected 1 certificate file parameter, got: $#")
- exit 1
- fi
- hlen=4
- rlen=0
- i=0
- offset=0
- offset_str=""
- flen=$(stat --printf="%s" $1)
- while [ $offset -lt $flen ];do
- len=$(openssl asn1parse -in $1 -inform DER $offset_str | grep SEQUENCE | \
- head -1 | grep -o 'l= [0-9]\{1,\}' | grep -o '[0-9]\{1,\}')
- rlen=$(expr $hlen + $len)
- openssl asn1parse -in $1 -inform DER -length $rlen $offset_str -out $i.der \
- -noout
- openssl x509 -in $i.der -out $i.pem -inform DER -outform PEM
- rm $i.der
- offset=$(expr $offset + $rlen)
- offset_str="-offset $offset"
- i=$(expr $i + 1)
- done
- echo "Found $i intermediate certificates"
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