>
> On Sun, Jun 15, 2008 at 10:56 PM, buyoppy
> <[EMAIL PROTECTED]> wrote:
>
> > I saw a webpage of Solaris's 'isencrypted'
> function which
> > inspects some data in a buffer is encrypted or not
> using
> > some algorithm including statistical analysis. But
> now I
> > cannot find that page on the Internet...
>
>
> Try this implementation, which I have not tested (or
> even compiled).
>
> #include <stdlib.h>
> #include <zlib.h>
>
> enum {
> PLANB_BUF_SIZE = 512;
> INADEQUATELY_EXPLAINED_MAGIC_NUMBER = 5;
> };
>
> static int incompressible(const char *inbuf, size_t
> len,
> char *outbuf, size_t outlen) {
> int rv = compress2(outbuf, outlen, inbuf, len,
> INADEQUATELY_EXPLAINED_MAGIC_NUMBER);
> if (Z_BUF_ERROR == rv)
> return 0; /* it grew. */
> else if (Z_MEM_ERROR == rv)
> return -1; /* meh, it's a guess. */
> else
> return rv > len;
> }
>
>
> int isencrypted(const char *buf, size_t len) {
> int retval;
> char planb_buf[PLANB_BUF_SIZE];
> void *out = malloc(len);
> if (out) {
> retval = incompressible(buf, len, out, len);
> free (out);
> return retval;
> } else {
> return incompressible(buf, PLANB_BUF_SIZE,
> planb_buf, PLANB_BUF_SIZE);
> }
> }
Thanks for your code, which may be useful when I would
have miss-erased zip extension of an archive.
But I mean 'encrypted' (NOT 'compressed') data.
Thanks.
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