ikuzar,
I'm sorry to be blunt, but if you don't understand what I'm saying
then you shouldn't be writing code that deals with low-level
cryptographic objects/primitives. See the recent revelations from
Sony and Nokia for why: even multinational corporations with hundreds
of specialist developers can all too easily ship "epic failboat" code.
As Dr. Henson has already pointed out you should use the subroutines
that OpenSSL provides to you.
On Wed, Mar 23, 2011 at 4:50 PM, ikuzar <razuk...@gmail.com> wrote:
> 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.
>
>
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