TLS library that will work on PIC24FJ1024GA606? Wiznet 5500

[allenhuffman]

Mbed TLS is highly recommended, but it requires 32-bit ints.

WolfSSL is highly recommended, but it requires a $7500 commercial license.

BearSSL is both highly recommended and highly discouraged -- and still in beta -- but it might work on 16-bit int systems.

Are there any PIC24-friendly TLS options???

We have a new hardware platform I have added http and such to, but we need to support encryption to send e-mail. This has led me down a bunch of routes that all dead end.
_________________
Allen C. Huffman, Sub-Etha Software (est. 1990) http://www.subethasoftware.com
Embedded C, Arduino, MSP430, ESP8266/32, and PIC24 programmer.
http://www.whywouldyouwanttodothat.com ?

Using: 24FJ256GA106, 24EP256GP202, 24FJ64GA002 and 24FJ1024GA606.

[Ttelmah]

Wolf is the only library I know that works on the PIC24.
Have you considered adding a hardware SSL chip?. There are a couple of
I2C ones that easily do the 'heavy lifting' of this.
Seriously this is a huge amount of processing work, and is not really suited
for smaller processors. It can be made to work (The Wolf code shows this),
but it still uses a huge amount of code space and processor time. It'd
probably be cheaper and easier, just to move to a smaller PIC, and add an
external chip to handle this. Search for TRUST&GO and TRUSTFLEX. There
are three chips I know of that could be used.
You would be looking at running out of RAM and ROM if you want to do a
lot 'else' on the processor.

[allenhuffman]

I can only use the hardware I have available. But if they have to do a board spin, they might be able to swap to a PIC32 then we could use Mbed TLS.
_________________
Allen C. Huffman, Sub-Etha Software (est. 1990) http://www.subethasoftware.com
Embedded C, Arduino, MSP430, ESP8266/32, and PIC24 programmer.
http://www.whywouldyouwanttodothat.com ?

Using: 24FJ256GA106, 24EP256GP202, 24FJ64GA002 and 24FJ1024GA606.