topic Re: why RSA RsaPkcs1v15VerSrv take too long time in S32K

why RSA RsaPkcs1v15VerSrv take too long time

zhurui — Mon, 17 Mar 2025 07:24:16 GMT

When I use RsaPkcs1v15VerSrv(HSE_HASH_ALGO_SHA2_512) to check 64K code, it take 500ms(response is OK), but I would like to use it to do security-boot, it can't be accept now,

does there configuration should i do?

My configuration:

PLL = 80MHz，HW firmware HSE_FW_S32K344_0_2_55_0

The data sheet says that RSA only need 16ms

Hash less 1.6ms

Re: why RSA RsaPkcs1v15VerSrv take too long time

lukaszadrapa — Tue, 18 Mar 2025 07:10:25 GMT

Hi @zhurui

Here's the reason:

There's only SW support for SHA512, so it can take pretty long time. To speed it up, it would be necessary to use HW accelerated version of the hash.

Regards,

Lukas

Re: why RSA RsaPkcs1v15VerSrv take too long time

zhurui — Tue, 18 Mar 2025 07:48:14 GMT

You are right, I change the hash to SHA-256, time is OK, so S32K3 hardware can support "HW accelerated version", or another firmware?

We use standard HSE Firmware.

Re: why RSA RsaPkcs1v15VerSrv take too long time

lukaszadrapa — Tue, 18 Mar 2025 10:13:26 GMT

There's no HW support in the device, so it can't be solved by different firmware.