Re: [Vala] encrypt decrypt

["Luis L. Rodríguez Oro" <luisr uci cu>]

El 22/10/11 12:40, "Luis L. Rodríguez Oro" escribió:
> El 22/10/11 11:05, pancake escribió:
> > What do you want from us? Implement a criptografic algorithm for you?
> >
> > There are several criptographic algorithms to do that. Check wikipedia.
> >
> > If you do not specify the algo we cant help, as long as its your own 
> > choice and your choice to implement it from scratch or use any of the 
> > available opensource libraries out there.
> >
> > On 22/10/2011, at 16:52, "Luis L. Rodríguez Oro"<luisr uci cu>  wrote:
> >
> > > I need encrypt and decrypt come text:
> > >
> > > string decrypt(string text, string password){
> > > // code
> > >
> > > return decrypted;
> > > }
> > >
> > >
> > > string encrypt(string text, string password){
> > > // code
> > >
> > > return encrypted;
> > > }
> > >
> > > void main(){
> > >     string text = "hello word";
> > >     string pass = "p4ssw0rd";
> > >
> > >     string enc = encrypt(text, pass);
> > >     print("%s\", enc);
> > >
> > >     string orig = decrypt(enc, pass);
> > >     print("%s\",orig);
> > > }
> > >
> > > I appreciate any help.
> > > Thanks for every body.
> > > Luis
>
> I only need encrypt some password to save to configuration.conf, I 
> need decrypt the password to used, MD5 don't work to me. I prefer use 
> some library.
> I've only used vala for 3 days, before that PHP.

Where is the encripted password and how decript it?

http://en.wikipedia.org/wiki/RC4
http://es.wikipedia.org/wiki/RC4

int S[255];
int i;
int j;

void swap(int i, int j) {
    int temp = S[i];
    S[i] = S[j];
    S[j] = temp;
}

/* KSA */
void rc4_init(string key) {
    int key_length = key.length;
    for (i = 0; i < 256; i++)
        S[i] = i;

    for (i = j =0; i < 256; i++) {
        j = (j + key[i % key_length] + S[i]) & 255;
        swap(i, j);
    }

    i = j =0;
}

/* PRGA */
int rc4_output() {
    i = (i + 1) & 255;
    j = (j + S[i]) & 255;

    swap(i, j);

    return S[(S[i] + S[j]) & 255];
}

void main() {
    string pass ="Key";
    string text = "Plaintext";
    rc4_init(pass);

    unichar c;
    //var p;
    for (int i = 0; text.get_next_char (ref i, out c);) {
        int data = int.parse("%d".printf((char) c));
        var keystream = rc4_output();

        var p = data ^ keystream;
        print("%d ",p);
    }

    print("\n");


}


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