Read from the privkey File

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Read from the privkey file.

def read_privkey_file(privkey_file):
    if os.path.exists(privkey_file):
        with open(privkey_file, 'rb') as f:
            try:
                privkey = f.read()
            except Exception as e:
                print("Cannot read: {}".format(e))
                sys.exit(1)
            f.close()
            return privkey
    else:
        print('Cannot find file: {}'.format(privkey_file))
        sys.exit(1)