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#!/usr/bin/env python3
# Copyright (c) 2015-2018 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
from argparse import ArgumentParser
from base64 import urlsafe_b64encode
from getpass import getpass
from os import urandom
import hmac
def generate_salt(size):
"""Create size byte hex salt"""
return urandom(size).hex()
def generate_password():
"""Create 32 byte b64 password"""
return urlsafe_b64encode(urandom(32)).decode('utf-8')
def password_to_hmac(salt, password):
m = hmac.new(bytearray(salt, 'utf-8'), bytearray(password, 'utf-8'), 'SHA256')
return m.hexdigest()
def main():
parser = ArgumentParser(description='Create login credentials for a JSON-RPC user')
parser.add_argument('username', help='the username for authentication')
parser.add_argument('password', help='leave empty to generate a random password or specify "-" to prompt for password', nargs='?')
args = parser.parse_args()
if not args.password:
args.password = generate_password()
elif args.password == '-':
args.password = getpass()
# Create 16 byte hex salt
salt = generate_salt(16)
password_hmac = password_to_hmac(salt, args.password)
print('String to be appended to bitcoin.conf:')
print('rpcauth={0}:{1}${2}'.format(args.username, salt, password_hmac))
print('Your password:\n{0}'.format(args.password))
if __name__ == '__main__':
main()
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