Shell Programming and Scripting

#!/bin/sh

# crypt-script.sh -- reads raw script in stdin, produces encrypted one
# on stdout.

cat <<'EOF'
#!/bin/sh
(openssl enc -d -base64 -a              |
        openssl enc -d -aes-256-cbc -a  |
        (
                read FIRSTLINE
                if [[ "${FIRSTLINE}" == "CRYPT" ]]
                then
                        bash
                else
                        echo "Bad password, or corrupted data" >&2
                fi
        )       ) <<'EOF'
EOF

(echo CRYPT ; cat ) | openssl enc -aes-256-cbc -a | openssl enc -base64 -a

echo EOF

exit 0

# Stupid example.  Very stupid example.
for ((N=0; N<10; N++))
do
        echo "HEY GUYS ALJ AF MY FACE IS A ROTTORN BANANANA"
done

$ ./crypt-script.sh < tocrypt.sh > newcrypt.sh
enter aes-256-cbc encryption password:
Verifying - enter aes-256-cbc encryption password:
$ chmod +x ./newcrypt.sh
$ ./newcrypt.sh
enter aes-256-cbc decryption password:
HEY GUYS ALJ AF MY FACE IS A ROTTORN BANANANA
HEY GUYS ALJ AF MY FACE IS A ROTTORN BANANANA
HEY GUYS ALJ AF MY FACE IS A ROTTORN BANANANA
HEY GUYS ALJ AF MY FACE IS A ROTTORN BANANANA
HEY GUYS ALJ AF MY FACE IS A ROTTORN BANANANA
HEY GUYS ALJ AF MY FACE IS A ROTTORN BANANANA
HEY GUYS ALJ AF MY FACE IS A ROTTORN BANANANA
HEY GUYS ALJ AF MY FACE IS A ROTTORN BANANANA
HEY GUYS ALJ AF MY FACE IS A ROTTORN BANANANA
HEY GUYS ALJ AF MY FACE IS A ROTTORN BANANANA
$

#!/bin/sh
(openssl enc -d -base64 -a              |
        openssl enc -d -aes-256-cbc -a  |
        (
                read FIRSTLINE
                if [[ "${FIRSTLINE}" == "CRYPT" ]]
                then
                        bash
                else
                        echo "Bad password, or corrupted data" >&2
                fi
        )       ) <<'EOF'
VTJGc2RHVmtYMTlEVVlUSlo4ckRaWDVYZ0J2eUY3bU8vOC9RZ0JmV1M3NEhjUmlD
VjRUdHNTUmVBNW14dlZqMApWTEk5RkI0Y3hIRmRtL29WRHF5aTFWMVViMXNUT3Rw
Yk5kU1NaQ2t4WmtxV3FrZlZCS0w0QXhGQTlJYlg2ZTRaCks2Tnp5ejd2UFN4WmdL
NkJLRXJvMUE9PQo=
EOF