Secure AuthenticationのトピックRe: Generate Private RSA key Inside SE052

Generate Private RSA key Inside SE052

MohitGediya — Wed, 17 Jun 2026 15:14:06 GMT

I use SE052 Secuere element IC.
I create zephyr based sample application which is generates RSA private key inside SE052.
But face the issue to generate new private RSA key, check this logs and fix it.
I want to Generate RSA key inside SE052 which can be use for TLS handshake process.

board is ESP32c3devkitm.
Zephyr RTOS version is 3.7.0 and TLS handshake v.1.2 is use.
I attach also sample application and logs with you. Please suggest how to generate RSA key.
@Kan_Li
Logs are in .c file key_generation_failed.c file

Re: Generate Private RSA key Inside SE052

MohitGediya — Wed, 17 Jun 2026 15:17:49 GMT

Function defination of called function is in last and it's comment for your reference.
Is there any issue about associated keyID?
Or APDU command header.
Can i generate only private key or key_pair in any format. There is no issue about type.
I just want any type of private RSA key inside SE052.

Re: Generate Private RSA key Inside SE052

MohitGediya — Thu, 18 Jun 2026 04:27:30 GMT

Please reply @Kan_Li

Re: Generate Private RSA key Inside SE052

Kan_Li — Thu, 18 Jun 2026 04:50:43 GMT

Hi @MohitGediya ,

Please use Se05x_API_WriteRSAKey() to generate the RSA key, the sample code can be something like below:

status = Se05x_API_WriteRSAKey(pSe05xSession,
(Se05xPolicy_t *)&policy_for_auth_obj,
RSA_ATTESTATION_KEY_ID,
2048,
SE05X_RSA_NO_p,
SE05X_RSA_NO_q,
SE05X_RSA_NO_dp,
SE05X_RSA_NO_dq,
SE05X_RSA_NO_qInv,
SE05X_RSA_NO_pubExp,
SE05X_RSA_NO_priv,
SE05X_RSA_NO_pubMod,
kSE05x_INS_NA,
kSE05x_KeyPart_Pair,
kSE05x_RSAKeyFormat_CRT);

Please assign proper policy to the key pair, especially no disabling the deletion, otherwise the key can not be removed any more.

Have a great day,
Kan

-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!
- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
-------------------------------------------------------------------------------