Decrypt password tool for windows EC2 instance

decrypt_aws_password.sh

#!/bin/bash
#
# Decrypt password tool for windows EC2 instance
#
# 1. Launch windows instance
# 2. Select [Get System Log] item from [Instance Actions] pull down menu.
# 3. Copy the text between the <password> and </password> tags into a temp file.
# 4. Decrypt the file
#      decrypt_aws_password.sh tempfile.txt
#
PKEY=~/.ssh/id_rsa

if [ "$1" = "" ] ; then
    echo "usage: "
    echo "  decrypt_aws_password.sh tempfile.txt"
    exit 1
fi

base64 -d -i $1 | openssl rsautl -decrypt -inkey ${PKEY}
exit 0