mirror of
https://github.com/5im-0n/sshenc.sh.git
synced 2025-08-02 11:20:05 +02:00
110 lines
2.6 KiB
Bash
Executable File
110 lines
2.6 KiB
Bash
Executable File
#!/bin/bash
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OPTIND=1 # reset in case getopts has been used previously in the shell.
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me=sshenc.sh
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show_help() {
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cat << EOF
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usage: $me [-p <public ssh key> | -s <private ssh key>] [-h]
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examples:
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- encrypt a file
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$me -p ~/.ssh/id_rsa.pub < plain-text-file.txt > encrypted.txt
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- decrypt a file
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$me -s ~/.ssh/id_rsa < encrypted.txt
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$me home page: https://sshenc.sh/
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EOF
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}
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cleanup() {
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rm -rf "$temp_dir"
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}
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while getopts "h?p:s:" opt; do
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case "$opt" in
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h|\?)
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show_help
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exit 0
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;;
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p) public_key+=("$OPTARG")
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;;
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s) private_key=$OPTARG
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;;
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esac
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done
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shift $((OPTIND -1))
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[ "$1" = "--" ] && shift
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temp_dir="$(mktemp -d -t "$me.XXXXXX")"
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temp_file_key="$(mktemp "$temp_dir/$me.XXXXXX.key")"
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temp_file="$(mktemp "$temp_dir/$me.XXXXXX.cypher")"
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trap cleanup EXIT
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#encrypt
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if [[ "${#public_key[@]}" > 0 ]]; then
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openssl rand 32 > $temp_file_key
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echo "-- encrypted with https://sshenc.sh/"
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echo "-- keys"
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for pubkey in "${public_key[@]}"
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do
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if [[ -e "$pubkey" ]]; then
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convertedpubkey=$temp_dir/$(basename "$pubkey").pem
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ssh-keygen -f "$pubkey" -e -m PKCS8 > $convertedpubkey
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#encrypt key with public keys
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if openssl rsautl -encrypt -pubin -inkey "$convertedpubkey" -in "$temp_file_key" -out $temp_dir/$(basename "$pubkey").key.enc; then
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echo "-- key"
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openssl base64 -in $temp_dir/$(basename "$pubkey").key.enc
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echo "-- /key"
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fi
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fi
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done
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echo "-- /keys"
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if cat | openssl enc -aes-256-cbc -salt -pass file:"$temp_file_key" > "$temp_file"; then
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openssl base64 -A < "$temp_file"
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fi
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#decrypt
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elif [[ -e "$private_key" ]]; then
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stdin=`cat`
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keys_enc=$(echo "$stdin" | awk '/-- keys/{f=1;next} /-- \/keys/{f=0} f')
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cypher=$(echo "$stdin" | sed -e '1,/-- \/keys/d')
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i=0
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while read line ; do \
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if [ "$line" == "-- key" ]; then
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i=$(($i + 1))
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elif [ "$line" == "-- /key" ]; then
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:
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else
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keys[i]="${keys[$i]}$line"
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fi
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done <<< "$keys_enc"
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decrypted=false
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for key in "${keys[@]}"
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do
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if ((echo "$key" | openssl base64 -d -A | openssl rsautl -decrypt -ssl -inkey "$private_key" > "$temp_file") > /dev/null 2>&1); then
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if echo "$cypher" | openssl base64 -d -A | openssl aes-256-cbc -d -pass file:"$temp_file"; then
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decrypted=true
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fi
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fi
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done
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if [ $decrypted = false ]; then
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>&2 echo "no valid decryption key supplied"
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exit 1
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fi
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#help
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else
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show_help
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exit 1
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fi
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