Hi Palomo,

You seem to be compiling for a system with a Linux kernel, but with only
a partial Unix userland. The “Unix” code in the entropy_poll module
might work on your system, but it is only enabled if __unix__ or __unix
(or a few others) is defined.

Can you please try the attached patch? Does your runtime environment
have /dev/urandom ?

Regarding the knowledge base article, you need to remove the "."
character at the end of the URL:
https://tls.mbed.org/kb/how-to/add-a-random-generator--

Gilles Peskine
Mbed TLS developer

On 19/05/2020 21:43, Jesus Gualberto Palomo Garcia via mbed-tls wrote:
> Hello Hanno, Thanks for your thanks for you quickly replay.
>
> I have an error compilation, I'm using nios2-linux-uclibc for my cross
> compilation and uclinux architecture,
> the linux kernel is 2.60 but I have this error when I try to compile
> the library, I want to use the library as a simple client using TLS1.2
>
> $ make static
>   CC    aes.c
>   CC    aesni.c
>   CC    arc4.c
>   CC    aria.c
>   CC    asn1parse.c
>   CC    asn1write.c
>   CC    base64.c
>   CC    bignum.c
>   CC    blowfish.c
>   CC    camellia.c
>   CC    ccm.c
>   CC    chacha20.c
>   CC    chachapoly.c
>   CC    cipher.c
>   CC    cipher_wrap.c
>   CC    cmac.c
>   CC    ctr_drbg.c
>   CC    des.c
>   CC    dhm.c
>   CC    ecdh.c
>   CC    ecdsa.c
>   CC    ecjpake.c
>   CC    ecp.c
>   CC    ecp_curves.c
>   CC    entropy.c
>   CC    entropy_poll.c
> entropy_poll.c:56:2: #error "Platform entropy sources only work on
> Unix and Windows, see MBEDTLS_NO_PLATFORM_ENTROPY in config.h"
> Makefile:285: recipe for target 'entropy_poll.o' failed
> make: *** [entropy_poll.o] Error 1
>
> BTW the article is not
> found https://tls.mbed.org/kb/how-to/add-a-random-generator.
> <https://tls.mbed.org/kb/how-to/add-a-random-generator.>
>
> Many thanks!!
>
>
> On Tue, May 19, 2020 at 9:01 AM Hanno Becker <Hanno.Becker@arm.com
> <mailto:Hanno.Becker@arm.com>> wrote:
>
>     Hi Palomo,
>
>     Please take a look at the recent
>     thread https://lists.trustedfirmware.org/pipermail/mbed-tls/2020-April/000069.html 
>     which should give you a better understanding of how Mbed TLS
>     manages and uses entropy from the underlying system.
>
>     Regards,
>     Hanno
>     ------------------------------------------------------------------------
>     *From:* mbed-tls <mbed-tls-bounces@lists.trustedfirmware.org
>     <mailto:mbed-tls-bounces@lists.trustedfirmware.org>> on behalf of
>     Jesus Gualberto Palomo Garcia via mbed-tls
>     <mbed-tls@lists.trustedfirmware.org
>     <mailto:mbed-tls@lists.trustedfirmware.org>>
>     *Sent:* Tuesday, May 19, 2020 2:56 PM
>     *To:* mbed-tls@lists.trustedfirmware.org
>     <mailto:mbed-tls@lists.trustedfirmware.org>
>     <mbed-tls@lists.trustedfirmware.org
>     <mailto:mbed-tls@lists.trustedfirmware.org>>
>     *Subject:* [mbed-tls] support mbedTLS no entropy source
>      
>     Hi all!
>
>     I'm Palomo and I've been working with your library a few weeks
>     ago, I'm using Linux kernel 2.60 but my embedded system has a
>     limit entropy source, i now that this is a critical point, but How
>     can I use your library if I want to use a other entropy source? 
>
>     Thanks and waiting for you!
>
>     --
>     *¡Saludos! Best wishes!*
>     *
>     *
>     *
>     /*Jesus** Palomo*/
>
>     México, D.F.
>
>     *
>
>
>
> --
> *¡Saludos! Best wishes!*
> *
> *
> *
> /*Jesus** Palomo*/
>
> México, D.F.
>
> *
>

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