Re: [leshan-dev] Cipher suite for LWM2M PSK Mode

[halo_lh@xxxxxx]

Hi Manu,

 

Thanks a lot for the clarification.

With the help of your answer I managed to locate the relevant functions (in the scandium source code).

 

In LWM2M PSK-Mode the client supports TLS_PSK_WITH_AES_128_CCM_8 and TLS_PSK_WITH_AES_128_CBC_SHA256 in the "ClientHello" message, but the server selects TLS_PSK_WITH_AES_128_CCM_8 within the "ServerHello" message.

 

Kind regards

Peter

 

Gesendet: Dienstag, 09. August 2016 um 15:58 Uhr
Von: "Manu Sangoi Dev" <manu.sangoi.dev@xxxxxxxxx>
An: "leshan developer discussions" <leshan-dev@xxxxxxxxxxx>
Betreff: Re: [leshan-dev] Cipher suite for LWM2M PSK Mode

Hi Peter, 

 

The leshan client is based on the Eclipse Scandium DTLS implementation.

Both cipher suites are supported in this given order of preference: TLS_PSK_WITH_AES_128_CCM_8, TLS_PSK_WITH_AES_128_CBC_SHA256.

 

The LeshanClient API does not allow to set the list of supported cipher suites. 

If you need to change it, you can have a look at the Scandium class DtlsConnectorConfig and the way it is instantiated in the LeshanClient constructor.

 

Thanks.

Manu

 

On 08 Aug 2016, at 11:58, halo_lh@xxxxxx wrote:

 

Hi All,

 

i was wondering which cipher suite is in use, when a Leshan-LWM2M-demo-client is in PSK-mode.

Is it "TLS_PSK_WITH_AES_128_CCM_8" or is it "TLS_PSK_WITH_AES_128_CBC_SHA256"?

 

Furthermore, is it possible to select a particular cipher suite?

 

Thanks in advance : )
Peter

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