Yes.. Thanks for correcting me..

Vikas


--- On Mon, 14/7/08, Michael S. Zick wrote:

> From: Michael S. Zick
> Subject: Re: Openssl_malloc returns NULL.
> To: openssl-users@openssl.org
> Date: Monday, 14 July, 2008, 5:15 PM
> On Mon July 14 2008 03:34, vikas khanna wrote:
> >
> > Thanks for a quick reply.
> >
> > Looking at how HMAC_Init is defined.. it calls both
> the function you mentioned so I assume I am correct in
> using HMAC_Init . Key and md are never null in my case.
> >
> > void HMAC_Init(HMAC_CTX *ctx, const void *key, int
> len,
> > const EVP_MD *md)
> Did you mean:
> {
> if(key && md){
> HMAC_CTX_init(ctx);
> HMAC_Init_ex(ctx,key,len,md, NULL);
> }
> }
>
> Mike
> >
> > Regards,
> > Vikas
> >
> >
> > --- On Mon, 14/7/08, Klarth
> wrote:
> >
> > > From: Klarth
> > > Subject: Re: Openssl_malloc returns NULL.
> > > To: "vikas khanna"
>
> > > Date: Monday, 14 July, 2008, 1:31 PM
> > > Hi,
> > >
> > > Its difficult to give you a straight answer on
> this
> > > question because I
> > > can't figure out which of those parameters,
> apart from
> > > hmacCtx, are
> > > pointers, which ones you allocate before using
> the HMAC
> > > functions, how
> > > you allocate them, and how you manipulate them
> before this
> > > function
> > > (that is if you do manipulate them). However ....
> > >
> > > I believe the documentation has the answer in
> your case. If
> > > you look
> > > at the documentation for the HMAC functions
> > > (http://www.openssl.org/
> > > docs/crypto/hmac.html), you will notice that it
> says taht
> > > HMAC_CTX_init() MUST be called on hmacCtx first.
> This is
> > > regardless
> > > whether you are using malloc or not for the
> context. I
> > > believe this is
> > > why you are getting stack corruption. Another
> point from
> > > the
> > > documentation is that you should now be using
> > > HMAC_Init_ex() instead
> > > of HMAC_init, since HMAC_init has been deprecated
> (although
> > > it still
> > > works in 0.9.8e).
> > >
> >
> >
> > >
> > > --- Kah
> > >
> > >
> > > On Jul 14, 3:40Â*pm, vikas191...@yahoo.com (vikas
> khanna)
> > > wrote:
> > > > Hi ,
> > > > I am using openssl-0.9.8e in my codebase.
> > > > I am using SHA1 in my code base to
> authenticate my
> > > data. The code seems to work fine for 5-10 mins.
> But after
> > > sometime it crashes as openssl_malloc returns
> null in
> > > function EVP_DigestInit_ex . This is defiantly
> not the
> > > problem of memory exhaustion as, the crash dumps
> shows 700
> > > KB of largest free memory block available and the
> ctx size
> > > is of 100 bytes.
> > > > This seems to be the case of stack
> corruption. While
> > > surfing though the net , I found exactly similar
> problem on
> > > this link
> > > >
> > >
> http://www.mail-archive.com/openssl-.../msg51093.html
> > > .
> > > >
> > > > I would like to know Â*, if this problem is
> due to my
> > > code , or some bug in openssl. My code snippet is
> shown
> > > below…
> > > >
> > > > Calculate_Hash(….)
> > > > {
> > > >
> > > > Â* Â* HMAC_CTX hmacCtx;
> > > > Â* Â* HMAC_Init( &hmacCtx , (const void
> *)authKey
> > > , keyLength , EVP_sha1());
> > > > Â* Â* HMAC_Update( &hmacCtx , authStart
> ,
> > > authLength );
> > > > Â* Â* HMAC_Final( &hmacCtx , tagOffset ,
> &len
> > > );
> > > > Â* Â* HMAC_CTX_cleanup(&hmacCtx);
> > > >
> > > > }
> > > >
> > > > Regards,
> > > > Vikas
> > > >
> > > > Â* Â* Â*
> > >
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