1 Reply by preethi.muddapurahaleshap

(4 replies, posted in wolfSSL)

Hi Kareem,

Thanks for the reply,

Your suggestion: "For the best speed with ECC, I would recommend using SP math with SP math assembly speedups" did help to reduce the latency to 3 seconds. Although WOLFSSL_SP_ARM_CORTEX_M_ASM did give me few errors, so skipped that. Can you help me any other ways, I can still fasten this.

I tried attaching the config settings file. It doesn't add for some reason.

What is the size of the key you are trying to verify: It's 256 bit.

I don't know how to find out the version because the library was ported form the IDE environment. Let me check that with Microchip.

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2 Topic by preethi.muddapurahaleshap

(4 replies, posted in wolfSSL)

Hi,

I'm trying to bring wolfssl onto the microchip platform - MPLAB IDE. The current problem is with the ECDSA signature verification.

Environment details:
IDE - MPLAB IDE
MCU - SAME51
wolfssl library - Imported through the MPLAB code configurator [mcc]

I'm using the wc_ecc_verify_hash API for the verification. The verification is successful, but it seems to be taking a lot of time. I have added some log messages at the entry of each Internal function calls just to verify where it's taking a lot of time. Here is the log with timestamp:

[2024-08-26 16:06:40.964] DecodeECC_DSA_Sig
[2024-08-26 16:06:40.964] wc_ecc_verify_hash_ex
[2024-08-26 16:06:40.964] Entering mp_init
[2024-08-26 16:06:40.965] wc_ecc_curve_load
[2024-08-26 16:06:40.971] mp_init_multi
[2024-08-26 16:06:40.971] wc_ecc_new_point_ex MG
[2024-08-26 16:06:40.977] wc_ecc_new_point_ex MQ
[2024-08-26 16:06:40.977] mp_invmod
[2024-08-26 16:06:41.085] ecc_mul2add
[2024-08-26 16:06:56.938] mp_mod
[2024-08-26 16:06:56.950] mp_cmp
[2024-08-26 16:06:56.950] mp_cmp done
[2024-08-26 16:06:56.959] wc_ecc_curve_free FREE_CURVE_SPECS DONE
[2024-08-26 16:06:56.961] ECC_STATE_VERIFY_RES
[2024-08-26 16:06:56.961] Entering wc_ecc_reset
[2024-08-26 16:06:56.966] wc_ecc_reset
[2024-08-26 16:06:56.966] verification successful

you can see that ecc_mul2add is taking at least 7 seconds


I have also attached the my configuration for the library. you can see that I have define ECC_SHAMIR as this has a different API for verification and the time was less that not using this method.
The function call under the comment:
/* use Shamir's trick to compute u1*mG + u2*mQ using half the doubles */

My requirement is to finish the verification within 1 min [time sensitive]. I would like to know what can be the reason for it to take this much time and any ways to reduce the latency of it.

Any help appreciated.

Thanks.

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