mountData

#!/bin/bash
#
# How to use hdiutil to locally mount an encrypted DMG that requires a complex password
# The password is stored in a file, encrypted with the openssl library. The PW file is decrypted, 
# the PW is read into memory and passed to hdiutil then the decrypted PW file is removed with the
# srm command. In theory this is secure for 99% of users out there...however if you're being watched
# by any 3 letter agencies I would avoid this as the unencrypted password does live on your drive
# for a (very) short amount of time
#
# Sean Grimes
#

if (( $# < 1 ))
then
	echo 'No....just no'
fi

if (( $# > 1 ))
then
	echo 'No....just no'
fi

# Use openssl to decrypt the encrypted password file, write it to a temp file. The password to 
# decrypt the file is passed as a cmdline argument
openssl aes-256-cbc -in /Volumes/PATH/TO/PW_FILE -out passwd.tmp -d -pass pass:$1

# Use the decrypted password to mount the encrypted DMG
cat passwd.tmp | hdiutil attach /Volumes/PATH/TO/ENCRYPTED/DMG.sparsebundle -stdinpass

# Use srm to remove the decrypted password
srm -f passwd.tmp