On 11/25/2014 5:23 PM, mikedavies621@yahoo.com wrote:
> Hi,
>
> Question as title :  I have an existing product that has an ARM Cortex M3
> CPU and which I need to retrofit with assymetric crypto to send small
> amounts of encrypted data.  The CPU I am landed with doen't have a crypto
> module available and cannot be changed so I need a C library that can do
> assymetric crypto (key exchange etc) and still run, even if slowly) in a
> restricted memory space on a small ARM CPU.

"Small" is a relative term.  Likewise, how secure do you need the crypto
functions?

Tried sci.crypt for guidance as to algorithms appropriate for your data
and environment?  And Schneier's text is an excellent place from which
to extract ideas/algorithms.

Have you looked at things like sshd(8) to see what you might be able to lift
from the sources?

(And, you may wish to consider the consequences when/if exploits are
"made known" for any approach you take -- will you be able to live
with them?  And/or *patch* ex post factum??)

mikedavies621@yahoo.com wrote:
> Hi,

> Question as title : I have an existing product that has an ARM Cortex M3
  CPU and which I need to retrofit with assymetric crypto to send small
  amounts of encrypted data.  The CPU I am landed with doen't have a crypto
  module available and cannot be changed so I need a C library that can do
  assymetric crypto (key exchange etc) and still run, even if slowly) in a
  restricted memory space on a small ARM CPU.

axTLS library (http://axtls.sourceforge.net/) or maybe its inclusion in
ethernut
sourceforge /p/ethernut/code/trunk/nut/crypto
and www.ethernut.de

BSD/GNU Licensed

Bye

-- 
Uwe Bonnes                bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------

Op Wed, 26 Nov 2014 01:23:16 +0100 schreef <mikedavies621@yahoo.com>:
> Question as title :  I have an existing product that has an ARM Cortex  
> M3 CPU and which I need to retrofit with assymetric crypto to send small  
> amounts of encrypted data.  The CPU I am landed with doen't have a  
> crypto module available and cannot be changed so I need a C library that  
> can do assymetric crypto (key exchange etc) and still run, even if  
> slowly) in a restricted memory space on a small ARM CPU.
>
> Any ideas ?

http://cypherbridge.com/ProductsServices.html#uCrypt_Toolkit

Comes as source code, but not open source.


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Hi,

Question as title :  I have an existing product that has an ARM Cortex M3 CPU and which I need to retrofit with assymetric crypto to send small amounts of encrypted data.  The CPU I am landed with doen't have a crypto module available and cannot be changed so I need a C library that can do assymetric crypto (key exchange etc) and still run, even if slowly) in a restricted memory space on a small ARM CPU.

Any ideas ?

Thanks,

Mike