topic RSA usage examples in S32K

RSA usage examples

niccolentini — Tue, 03 Jun 2025 10:17:29 GMT

I'm working on a s32k344 board and I'm trying to develop a digital signature verification routine that uses RSA. The aim is to import the RSA public key from outside and use it to verify the signature over a file loaded in flash.
Is there any example code that shows how to import RSA key and perform RSA crypto operations?
Thanks

Re: RSA usage examples

lukaszadrapa — Wed, 04 Jun 2025 14:05:47 GMT

Hi @niccolentini

See please attached example.

Environment:

S32K344 with HSE FW 0_2_40_0
S32DS 3.5
RTD 4.0.0 HF01
EB 29.0

Regards,

Lukas

Re: RSA usage examples

Saimon — Thu, 23 Oct 2025 14:54:16 GMT

Good morning, I have a similar problem with K32L2B31VLH0A. I would like to validate a signature with 2048-byte RSA or with ECDS, which should require fewer resources for the same result. My problem is insufficient RAM, or at least that's what the NXP mbed TLS library returns. Are there any working examples on this microcontroller, or is 32 KB of RAM not enough? I have four products with this microcontroller and I need to understand if I need to replace the microcontroller or if there are possible solutions. What I need is to be able to validate a signed firmware upgrade.