Not able to configure mbedtls in STM32CubeIDE

Forum|Forum|7 months ago
September 23, 2025
5 replies
782 views

I want to use the rsa feature of mbedtls but when I uncomment #define MBEDTLS_RSA_C in the mbedtls_config file it is showing undefined reference to mbedtls_rsa_get_len, mbedtls_rsa_check_pub_priv, mbedtls_rsa_init, mbedtls_rsa_free and mbedtls_rsa_import_raw.

STM32CubeIDE

Best answer by Ghofrane GSOURI

Hello @Advait

I sincerely apologize ,I forgot to mention the steps I have already taken.

In STM32CubeMX, follow these steps to enable RSA support in MbedTLS:

1- Under Middleware, select MbedTLS.
2- Go to the Module tab.
3- Enable the option Show Advanced Parameters.
4- In the search bar, type MBEDTLS_RSA_C.
5- When you find the MBEDTLS_RSA_C option, set it to "Defined" ( select "Defined" from the dropdown).

Then Go to Feature support tab and change the value of MBEDTLS_PKCS1_V15 and MBEDTLS_PKCS1_V21 to defined

Generate and build the code : the rsa.c will be added successfully to your project

I am sorry again

THX

Ghofrane

Ghofrane GSOURI

Technical Moderator

Hello @Advait

Could you please provide your IOC in order to push further the investigation.

THX

Ghofrane

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

A

AdvaitD

Visitor II

Hi @Ghofrane GSOURI

Sorry for the late reply. Here is my ioc file.

dual_stage_lock_bootloader.ioc

A

AdvaitAuthor

Associate II

Hi @Ghofrane GSOURI

I accidently logged in with my other account. you can use the ISO file provided above.

Ghofrane GSOURI

Technical Moderator

Hello @Advait

After uncommenting the line #define MBEDTLS_RSA_C, I encountered the following build error:

In file included from ../MBEDTLS/App/mbedtls_config.h:3294,
 from ../Middlewares/Third_Party/mbedTLS/library/camellia.c:31:
../Middlewares/Third_Party/mbedTLS/include/mbedtls/check_config.h:511:2: error: #error "MBEDTLS_RSA_C defined, but none of the PKCS1 versions enabled"
 511 | #error "MBEDTLS_RSA_C defined, but none of the PKCS1 versions enabled"

To resolve this issue, I also uncommented #define MBEDTLS_PKCS1_V21 in the configuration file.
After making this change, the build completed successfully I did not encounter any undefined reference errors.