Hello,

This is a request for feedback about the next major release of Mbed TLS (TF-PSA-Crypto 1.0 + Mbed TLS 4,0). (Mbed TLS 3.6 LTS will remain supported with its current feature set until at least Q2 2027.) Please reply to this thread or on the GitHub issue linked below. If you wish to leave feedback privately, you can reply privately and your feedback will be anonymized before sharing outside Arm.

https://github.com/Mbed-TLS/TF-PSA-Crypto/issues/102

Mbed TLS 4 and TF-PSA-Crypto will complete our migration to PSA cryptography APIs, which are higher-level than the legacy mbedtls_xxx() APIs in Mbed TLS ≤3.x. As a consequence, the API will only provide access to ECC-based cryptographic mechanisms such as ECDH, ECDSA and ECJPAKE. (ECIES can be implemented on top of ECDH. Support for EdDSA and SPAKE2+ is planned, but might not be ready at the 4.0 release time.) It will not provide access to ECC arithmetic functions such as mbedtls_ecp_muladd().

Do you need custom ECC-based mechanisms (e.g. custom PAKE)? If so, please let us know which mechanisms and what arithmetic they require. We are not currently planning to make it possible to use such mechanisms without patching the TF-PSA-Crypto code.

Best regards,