• Registered: 2021-04-13
  • Posts: 3

Topic: SRP with WOLF_CONF_MATH set to SP Cortex-M

Hi,

I'm trying to prototype SRP on an STM32WB55 chip using STM32CubeIDE. I can compile my test program just fine when WOLF_CONF_MATH is set to 1 (FAST); however, in order to try to speed things up, I would like to use SP Cortex-M math. I can't get the program to compile when I set WOLF_CONF_MATH to 4. I keep getting compile errors to undefined reference to sp_submod. Is there anything special I need to do to get this to work?

I have attached my wolfSSL config file for your reference.

Thanks!

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  • Registered: 2015-10-07
  • Posts: 430

Re: SRP with WOLF_CONF_MATH set to SP Cortex-M

Hi keeperp,

Thank you for the report. I believe the `WOLF_CONF_MATH == 4` option will work if you comment out `WOLFSSL_SP_MATH` in the generated `wolfSSL.I-CUBE-wolfSSL_conf.h`. The `WOLFSSL_SP_MATH` define reduces code size and disables some areas of the code.

For example if building this on Linux "./configure --enable-srp --enable-sp --enable-sp-math && make" it will report "configure: error: Cannot use single precision math and SRP".
If I build without `--enable-sp-math` or `WOLFSSL_SP_MATH` it works fine.

Thanks,
David Garske, wolfSSL

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  • Registered: 2021-04-13
  • Posts: 3

Re: SRP with WOLF_CONF_MATH set to SP Cortex-M

That worked, thank you, David!

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