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#!/usr/bin/env python3
"""
Generates the Curve25519 keypair that is needed by the shapeshifter-dispatcher
server.
Depends on python3-pysodium package.
"""
import base64
import json
import os
import pysodium
import binascii
BRIDGE_PREAMBLE = "Bridge obfs4 <IP ADDRESS>:<PORT> <FINGERPRINT> cert="
BRIDGE_END = " iatMode=0"
def generate(statedir):
try:
os.makedirs(statedir)
except Exception:
pass
print("[+] Generating shapeshifter parameters...")
public, private = pysodium.crypto_box_keypair()
priv_hex = binascii.b2a_hex(private)
pub_hex = binascii.b2a_hex(public)
node_id = os.urandom(20)
node_id_hex = binascii.b2a_hex(node_id)
drbg_seed = os.urandom(24)
def tostr(b):
return b.decode('utf-8')
with open(statedir + '/obfs4_state.json', 'w') as state:
state.write(json.dumps({
'node-id': tostr(node_id_hex),
'private-key': tostr(priv_hex),
'public-key': tostr(pub_hex),
'drbg-seed': tostr(binascii.b2a_hex(drbg_seed)),
'iatMode': 0}))
cert = base64.b64encode(node_id + public)
print("CERT:", cert)
with open(statedir + '/obfs4_cert.txt', 'w') as certf:
certf.write(tostr(cert).rstrip('='))
with open(statedir + '/obfs4_bridgeline.txt', 'w') as bridgef:
bridgef.write(BRIDGE_PREAMBLE + tostr(cert) + BRIDGE_END)
print("[+] done")
if __name__ == "__main__":
import argparse
parser = argparse.ArgumentParser()
parser.add_argument("statedir")
args = parser.parse_args()
generate(args.statedir)
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