[Jheshka]

In my programming class, I'm starting my culminating. It's supposed to be a program with a purpose, instead of spewing out random integers, or other useless functions.

Does anyone have anything they think would be useful or fun?


I'm fresh out of ideas...

[Styles]

Built an app that connects to a P2P network as POC work... use like the Gnutella network..

[Jheshka]

I'd have to be able to do it from school to show my teacher... P2P networks use ports that are completely blocked at my school. Any other ideas?

[Styles]

Yea, a simple file encryption app. Give it a file name .. it reads the file .. encrypts it then decrypts it if you want, like have options.. Make it use like RC4 Encryption (look it up)

char *EnDeCrypt(const char *pszText, int iTextLen, const char *pszKey)
{
    char *cipher;                       /* Output buffer                */
    int a, b, i=0, j=0, k;              /* Ambiguously named counters   */
    int ilen;                           /* Length of a string           */
    int sbox[256];                      /* Encryption array             */
    int key[256];                       /* Numeric key values           */

    ilen = strlen(pszKey);

    for (a=0; a < 256; a++)
    {
        key[a] = pszKey[a % ilen];
        sbox[a] = a;
    }

    for (a=0, b=0; a < 256; a++)
    {
        b = (b + sbox[a] + key[a]) % 256;
        swapints(sbox, a, b);
    }

    cipher = (char *)malloc(iTextLen);

    for (a=0; a < iTextLen; a++)
    {
        i = (i + 1) % 256;
        j = (j + sbox[i]) % 256;
        swapints(sbox, i, j);
        k = sbox[(sbox[i] + sbox[j]) % 256];
        cipher[a] = pszText[a] ^ k;
    }
    return cipher;
}


void swapints(int *array, int ndx1, int ndx2)
{
    int temp = array[ndx1];
    array[ndx1] = array[ndx2];
    array[ndx2] = temp;
}

// I didn't write this but it's useful