Extract Bytes for Petya Key Searcher

#/bin/sh
# extract bytes needed for decryption of Petya

if [ -z $1 ]; then
	DEVPART=sdc
else
	DEVPART=$1
fi
	
# extract sector 55
dd if=/dev/${DEVPART} of=${DEVPART}_petya_sec_55_bytes.dd bs=512 count=1 skip=55

# extract sector 54
dd if=/dev/${DEVPART} of=${DEVPART}_petya_sec_54_bytes.dd bs=512 count=1 skip=54

# extract 8 bytes from sector 54, starting from 33
dd if=${DEVPART}_petya_sec_54_bytes.dd of=${DEVPART}_petya_nonce.dd bs=1 count=8 skip=33

# concatenate sector 55 and nonce and form base64 encoded text file for website upload
cat ${DEVPART}_petya_sec_55_bytes.dd | base64 > ${DEVPART}_petya_bytes_base64.txt
cat ${DEVPART}_petya_nonce.dd | base64 > ${DEVPART}_petya_nonce_base64.txt

# Method 1:
# use base64 encoded textfiles on https://petya-pay-no-ransom.herokuapp.com/ to generate the key
#
# Method 2:
# use https://github.com/leo-stone/hack-petya locally to generate the key
# Steps to install (if you are not familiar with go):
# mkdir go
# cd go 
# export $GOPATH=$(pwd)
# go get github.com/leo-stone/hack-petya
#