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idodeclare/demo_encrypt_decrypt.sh

Created December 31, 2019 18:22
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demo_encrypt_decrypt.sh
#!/bin/sh
keylength=8
algo=$1
[[ "$algo" = "aes" ]] && keylength=16
[[ "$algo" = "3des" ]] && keylength=24
encfile=$(mktemp -t _encXXXXXX) && \
keyfile=$(mktemp -t _encXXXXXX) && \
dd if=/dev/urandom of="$keyfile" bs="$keylength" count=1 >/dev/null 2>&1 && \
encrypt -a "$algo" -k "$keyfile" -i /etc/resolv.conf -o "$encfile" && \
decrypt -a "$algo" -k "$keyfile" -i "$encfile"
rc=$?
rm "$encfile" "$keyfile"
exit $rc
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