Crazy encrypting algo

Pages: 1234
Sorry I didn't coded this weekend.

Now it's perfectly working (using a key rotation).

Here's the code :

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    /** rotate the key */
    void rotation(std::string& key){
        if(key.size()<2){
            return;
        } else{
            key=key.substr(1)+key[0];
            return;
        }
    }

    std::string crypt(std::string& key, std::string msg){
        std::string tmp("");
        for(int i(0);i<msg.size();++i){
            tmp+=(msg[i]+atoi(key.substr(0,2).c_str()))%255;
            rotation(key);
        }
        return tmp;
    }

    std::string uncrypt(std::string& key, const std::vector<char>& msg){
        std::string tmp("");
        for(int i(0);i<msg.size();++i){
            char tmp_val=msg[i]-atoi(key.substr(0,2).c_str());
            if(tmp_val<0) tmp_val+=255;
            rotation(key);
            tmp+=tmp_val;
        }

        return tmp;
    }


Thank you for help !
Last edited on
This is not help, Zaap. It's self-help. One day I can start socket programing and to bump my head over the same problem too. I'd better be prepared in advance. Have a nice day!

P.s.Key rotation is a wise choice.
Last edited on
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Pages: 1234