from Crypto.Signature import PKCS1_v1_5
from Crypto.Hash import SHA512
from Crypto.PublicKey import RSA
import base64

while True:
    nama_file = raw_input("Nama file: ")
    try:
        inp_file = open(nama_file,"r").read()
        inp_file = inp_file.rsplit("\xff\xff\x00\x00MULAI_HASH\x00\x00\xff\xff",1)
        break
    except Exception, e:
        print e
        print "File Tidak Ditemukan"
        continue

message = inp_file[0]
signature_enc = inp_file[1]
signature_dec = str(base64.b64decode (signature_enc))
# print signature_dec
key = RSA.importKey(open('public_key.pub').read())
h = SHA512.new(message)
verifier = PKCS1_v1_5.new(key)
if verifier.verify(h, signature_dec):
   print "The signature is authentic."
else:
   print "The signature is not authentic."