encryption of data elements

[Doug Hardie]

I need to encrypt small data elements.  These elements run from about 
16 to 64 bytes in size.  It would be really handy if the encrypted size 
were the same as the original size.  However, if it can't be I do need 
to be able to predict the encrypted size in advance.  Digging around 
through openssl I came up with the following approach:

#include <stdio.h>
#include <openssl/rc4.h>
RC4_KEY key;
char buf[1000];
char out[2000];
int main (int argc, char *argv[])
{
        int size, i;
        size = strlen (argv[2]);
        RC4_set_key (&key, size, argv[2]);
        RC4 (&key, strlen(argv[1]), argv[1], out);
        printf ("%s", out);
}

Where the first arg is the value and the second is the key.  It seems 
to work but I don't know if this is the best algorithm to use or if 
there is a better approach.  Thanks,

-- Doug

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