Código: Seleccionar todo

void RC4(char*bytes,char*key)
{
    char* s = new char[256];
    char* k = new char[256];
    char temp;
    int i, j;

    for (i = 0; i < 256; i++)
    {
        s[i] = (char)i;
        k[i] = key[i % sizeof(key)];
    }

    j = 0;
    for (i = 0; i < 256; i++)
    {
        j = (j + s[i] + k[i]) % 256;
        temp = s[i];
        s[i] = s[j];
        s[j] = temp;
    }

    i = j = 0;
    for (int x = 0; x < sizeof(bytes); x++)
    {
        i = (i + 1) % 256;
        j = (j + s[i]) % 256;
        temp = s[i];
        s[i] = s[j];
        s[j] = temp;
        int t = (s[i] + s[j]) % 256;
        bytes[x] ^= s[t];
    }
}