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#!/bin/zsh
# Convert traditional SSH private key format to PCKS#8 with 3DES
# See http://martin.kleppmann.com/2013/05/24/improving-security-of-ssh-private-keys.html
# Need the private key file as an argument
[ -z $1 ] && echo "Provide the private key as an argument." && exit 1
[ ! -e $1 ] && echo "$1 does not exist." && exit 2
function topkcs8 {
umask 0077
mv $1 ${1}.old
openssl pkcs8 -topk8 -v2 des3 -in ${1}.old -out $1
}
CRYPTO=$(head -n 1 $1 | awk '{print $2}')
case $CRYPTO in
"EC" | "DSA" | "RSA")
topkcs8 $1
;;
"ENCRYPTED")
echo "$1 already converted."
exit 3
;;
*)
echo "$1 not readable or not a valid format."
exit 4
;;
esac
exit 0