use symmetric encription

sshencdec.sh

@@ -23,6 +23,12 @@ $me home page: https://git.e.tern.al/s2/sshencdec
 EOF
 }
 
+cleanup() {
+    rm -f "$temp_file"
+    rm -f "$temp_file_key"
+    rm -f "$temp_file_key.enc"
+}
+
 while getopts "h?p:s:" opt; do
     case "$opt" in
     h|\?)
@@ -40,16 +46,32 @@ shift $((OPTIND-1))
 
 [ "$1" = "--" ] && shift
 
-temp_file="$(mktemp "${TMPDIR:-/tmp}/$(basename "$0").XXXXXX")"
-trap '{ rm -f "$temp_file"; }' EXIT
+temp_file="$(mktemp "${TMPDIR:-/tmp}/$(basename "$0").XXXXXX.enc")"
+temp_file_key="$(mktemp "${TMPDIR:-/tmp}/$(basename "$0").XXXXXX.key")"
+trap cleanup EXIT
 
+#encrypt
 if [[ -e "$public_key" ]]; then
-    if openssl rsautl -encrypt -pubin -inkey <(ssh-keygen -f "$public_key" -e -m PKCS8) -ssl > "$temp_file"; then
-        echo "-- encrypted with https://git.e.tern.al/s2/sshencdec"
-        openssl base64 < "$temp_file"
+    openssl rand 32 > $temp_file_key
+
+    if openssl rsautl -encrypt -pubin -inkey <(ssh-keygen -f "$public_key" -e -m PKCS8) -in "$temp_file_key" -out "$temp_file_key.enc"; then
+        if openssl enc -aes-256-cbc -salt -pass file:$temp_file_key > "$temp_file"; then
+            echo "-- encrypted with https://git.e.tern.al/s2/sshencdec"
+            echo "-- key"
+            echo "$(openssl base64 -in "$temp_file_key.enc")"
+            echo "-- /key"
+            openssl base64 < "$temp_file"
+        fi
     fi
+
+#decrypt
 elif [[ -e "$private_key" ]]; then
-    openssl base64 -d | openssl rsautl -decrypt -inkey $private_key
+    stdin=`cat`
+    key_enc=$(echo "$stdin" | awk '/-- key/{f=1;next} /-- \/key/{f=0} f')
+    cypher=$(echo "$stdin" | sed -e '1,/-- \/key/d')
+    echo "$key_enc" | openssl base64 -d | openssl rsautl -decrypt -ssl -inkey "$private_key" > "$temp_file"
+    echo "$cypher" | openssl base64 -d | openssl aes-256-cbc -d -pass file:"$temp_file"
+
 else
     show_help
     exit 1