SAHARA PRNG

vbhat — Sat, 07 May 2016 00:49:20 GMT

Hi,

I'm trying to generate some random numbers using the SAHARA lite on iMX51. When I try to generate the random number, there is an error in the ERROR STATUS register with 'error source' set to 3. (invalid descriptor pointer / length).

The descriptor which I load looks like this :

Header --> Desc #18

Len1 -> Number of random bytes needed

Ptr1 --> Pointer to link node

Len2 --> 0

Ptr2 --> NULL

Next --> NULL.

Link Node :

len --> num of bytes needed

ptr --> pointer to the data buffer

next --> NULL

Is the descriptor format correct? There's no example in the security manual.

Thanks

Re: SAHARA PRNG

Yuri — Tue, 10 May 2016 07:45:43 GMT

Hello,

You may look at NXP Linux BSP, using it as an example.

In particular, please take a look at Chapter 23 [Symmetric/Asymmetric
Hashing and Random Accelerator (Sahara) Drivers] of "mx51_linux.pdf",

which describes main features of the driver and its sources.

http://www.nxp.com/webapp/Download?colCode=IMX51_ER1011_LINUXDOCS_BUNDLE&Parent_nodeId=1276656133953740071624&Parent_pag…

Summary page :

i.MX51 Software & Development Tool Resources|NXP

Have a great day,
Yuri

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