public_key = b"""MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDgVShzcLSPiOi+8ET8fggob1kmi47/cE12JaidPkwfGnScZItghkqtiLsct0U4kJhlp5gO89DYTBmIKadvxwY7kMsLlZzmi2emVH7c27cByGASY8QmWDNdG4Ggy/NDflGGBdAtN6gHawZAg4zHv3qpbPQGHH1/6sXIohcXhOnouwIDAQAB""" new_public_key = b"""MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDYCk7qQIY6iPyXy+lkIV93prSpYt9b7WpKQFpMQR5QqPnnpyMzJnuOB6sbV7Mta5SISgrNGL5UoJmTI3cjUbijzHM9s0e99kCD5swdG9sPQnb5/bYbYR2lHYb5C9l3coBWuGCl9RdCXeERhLmZfVy/5Wyg0heO+Sb6RgyfqywlZQIDAQAB""" from sys import argv with open(argv[1], "rb") as f: data = f.read() assert public_key in data with open(argv[1], "wb") as f: f.write(data.replace(public_key, new_public_key))