I do not understand what you mean.
1) I tried to print data's size returned by i2d_DHparams(const_dh,
&dhbuf); without computing private nor public key. I have got 138 bytes.
Then I remade the same operation but I had computed private and public key
using DH_generate_key(dh);
and I have still got 138 bytes ...it seems to be odd for me, because I think
dh's size must be greater after computing keys.
2) I tried the following check before and after computing keys :
if (dh->priv_key == NULL)
printf("\n1)dh->priv_key is NULL\n");
else
printf("\n1)dh->priv_key is not NULL\n");
Before computing key, I have got priv_key is NULL. After computing, priv_key
is not NULL
I 'm wondering what happens... could you tell me more about bit counting ? I
do not understand "The private and public keys should be similar in size to
p. "
Thanks for your help.
2011/3/23 Mike Mohr <akih...@gmail.com>
> Try checking the bit count of the structure members. The private and public
> keys should be similar in size to p.
> On Mar 23, 2011 10:27 AM, "ikuzar" <razuk...@gmail.com> wrote:
> > Hello,
> > I 'd like to know how to verify that DH private and public key have been
> > generated ?
> > In my DH struct, p and g had been generated with commands line ( openssl
> > dhparam... )
> >
> > struct
> > {
> > BIGNUM *p; // prime number (shared)
> > BIGNUM *g; // generator of Z_p (shared)
> > BIGNUM *priv_key; // private DH value x
> > BIGNUM *pub_key; // public DH value g^x
> > // ...
> > };
> > DH
> >
> >
> > Priv_key and pub_key are generated later with DH_generate_key(dh).
> >
> > I would like verify if DH_generate_key( ) has generated the priv_key ( an
> > human proof, example by using DHparams_print_fp(fp, dh ); ) I used this
> > function but it did not print private key into file pointed by fp.
> >
> > Thanks for your help.
>
