ASd0Xy7N

1#!/usr/bin/env python
2
3import os
4import subprocess
5import sys
6import time
7from binascii import hexlify, unhexlify
8from pyelliptic import Cipher, ECC
9from pyelliptic import hash as _hash
10import fileinput
11
12## Generating a secret key from the public and private keys using ECDH ##	
13def generate_shared_key():
14        print("Generating shared key from ECDH and ECDSA")
15        cmd = "openssl pkeyutl -derive -inkey pc_private_key.pem -peerkey ardi_public_key.pem"
16        p = subprocess.Popen(cmd, stdout = subprocess.PIPE, shell =True)
17        (output, err) = p.communicate()
18        print("Shared key generation - OK!")
19        return output
20
21## main ##
22if __name__ == '__main__':
23        
24	secret_key = generate_shared_key()
25	print(hexlify(secret_key))
26
27	print("Data decryption using AES_256_CBC")
28	ciphername = "aes-256-cbc"
29	iv_hex = b"000102030405060708090A0B0C0D0E0F"
30	iv = unhexlify(iv_hex)	
31
32
33	while(True):
34		print "Enter Text to Decrypt :\n"
35		for line in fileinput.input():
36			print line
37			print len(line)
38			enc = unhexlify(line[0:len(line)-1])
39			ctx = Cipher(secret_key, iv, 0, ciphername=ciphername)
40			deciphered_txt = ctx.ciphering(enc)
41			print (deciphered_txt)