Date: Sat, 22 Feb 2003 15:33:51 -0800 From: Doug Hardie <bc979@lafn.org> To: freebsd-questions@FreeBSD.ORG Subject: encryption of data elements Message-ID: <197F7250-46BE-11D7-9DF5-000393681B06@lafn.org> In-Reply-To: <freemail.20030123002124.51347@fm11.freemail.hu>
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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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