How can I use openssl/hmac

[Jeong Hyun Seok]

I need to call HMAC() function in "openssl/hmac" Is there any method to use it in nRF51822?

Thanks in advance.

[Øyvind Karlsen]

Hi,

It should be possible to make an embedded version of the hmac function, there several C sources available online. However I do not recommend it as it will have an immense runtime, causing system delays and high power consumption. Instead have a look at this blogpost on application level security using the ECB peripheral.

Best regards,

Øyvind

[Øyvind Karlsen]

This is the implementation that we use in the eddystone SDK.

[mstrouse]

If one looks around the inter-webs carefully, there are also fine-tuned cortex-mX asm implementations of most of those libraries / functions.

[Jeong Hyun Seok]

Thanks, both of you. I use HMAC not very often. so I would like to use HMAC anyway - also, I have to follow to match counterpart engineer - who uses HMAC. @mstrouse - could you kindly share embedded version HMAC? - hard to find.