12 Aug
2020
12 Aug
'20
4:32 p.m.
Hello,
The interface of the Diffie-Hellman (DHM) module is modeled on the way it's used in TLS, which is a bit different from the classical presentation. You can find code examples in programs/pkey/dh_client.c and programs/pkey/dh_server.c .
Elliptic-curve Diffie-Hellman (provided by the ECDH module) has similar security properties and is significantly faster. If you don't need interoperability with legacy software that only supports classical (finite-field) Diffie-Hellman, you should use ECDH rather than DHM. With the ECDH module, you can use either the same TLS-inspired interface as the DHM module, or a more classical interface for which there is a usage example in psa_crypto.c in the function psa_key_agreement_ecdh.
Hope this helps,
--
Gilles Peskine
Mbed TLS developer
You can find an example of the TLS-like inter
On 12/08/2020 14:02, youssouf sokhona via mbed-tls wrote:
>
> Hello, I hope you are going well during this Covid crisis.
>
>
>
> I'm sending you this message to find out how to generate a Diffie
> Hellman key using MbedTLS. Indeed, with all the documentation, I'm a
> bit lost.
>
>
>
> I think, you have to use the int mbedtls_dhm_set_group function to
> create p and g. And then, I don't know how to use which function...
> Moreover, I can't find any function that allows to set a and b,
> whereas they are 2 fundamental elements
>
> Can you help me? Thank you!
>
>
>
> Best regards, YS
>
>
>