Libgcrypt: How to implement ECIES encryption (ECC + AES)

[Yann Garcia]

Hello Stephen,

Thanks a lot for your response.
Does it mean that  RFC 2898.  is not supported?

Best regards,

Yann Garcia
Senior Software Engineer
Microsoft MCAD.net Certified
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On Mon, 12 Nov 2018 at 13:47, Stephan Mueller <smueller at chronox.de> wrote:

> Am Montag, 12. November 2018, 13:24:01 CET schrieb Yann Garcia:
>
> Hi Yann,
>
> > Dear All,
> >
> > I want to implement ECIES encryption. To do it, I have to 1) generate
> ECDH
> > secret key (the key agreement) and then 2) derive it using Key Derivation
> > Function 2 (KDF2).
> >
> > 1) For the key agreement, I need to generate a random number.
>
> You need to have the local private ECDH key and the remote public ECDH
> key. A
> plain random number does not work as you need to send the local public
> ECDH
> key to your recipient as otherwise he cannot decrypt it.
>
> > Can you
> > indicate me the best way to generate this random number because in the
> > help, clause 9.2 Retrieving random numbers, I found 3 different methods
> and
> > I don't know which one is the best for my purpose?
> >
> > 2) Is it correct to use the function gcry_kdf_derive() with
> GCRY_KDF_PBKDF2
> > flag to do the Key Derivation Function 2?
>
> Nope, PBKDF is not allowed. Key-based KDFs like SP800-108 or RFC5967 are
> ok. I
> am not sure libgcrypt offers a native implementation of those.
> >
> > 3) Does the libgcrypt provides samples for ECIES encryption?
> >
> > Many thanks in advance for your help,
> >
> > Best regards,
> > Yann Garcia
> > Senior Software Engineer
> > Microsoft MCAD.net Certified
> > **************************************
> > FSCOM SARL
> > Le Montespan B2
> > 6,
> > <
> https://maps.google.com/?q=6,%C2%A0+Avenue+des+Alpes&entry=gmail&source=g>
> > Avenue des Alpes
> > <
> https://maps.google.com/?q=6,%C2%A0+Avenue+des+Alpes&entry=gmail&source=g>
> > F-06600 Antibes, FRANCE
> > ************************************************
> > Tel: +33 (0)4 92 94 49 08
> > Mobile: +33 (0)7 61 00 77 05
> > Email: *yann.garcia at fscom.fr* <yann.garcia at fscom.fr>
> >            Yann.Garcia_EXT at etsi.org
> > Skype: yann.garcia
> > Google+: garcia.yann at gmail.com
>
>
>
> Ciao
> Stephan
>
>
>
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