Where is STSAFE-A110 documentation?

[parmi93]

I am currently working with the STSAFE-A110 and I have noticed a significant lack of documentation for those who need to implement or understand the driver logic.

For instance, when generating ECC asymmetric key pairs, the official datasheet mentions the Generate Key command (¶ 4) but does not document its I2C syntax or semantics.

Although I am using the STSELib middleware, I have found that its APIs, such as stse_generate_ecc_key_pair() also lack exhaustive documentation. A specific example is the PLAT_UI16 usage_limit parameter; its purpose is never explained.

By digging into the STSELib source code, it appears usage_limit parameter is passed directly to the STSAFE-A110 via I2C.

Furthermore, in the Doxygen documentation there is an example where usage_limit is set to 100,

while the STSAFE-A120 examples use 255.

    /* ## Generate key pair in slot 1 */
    uint8_t slot_1_public_key[stse_ecc_info_table[STSE_ECC_KT_NIST_P_256].public_key_size];
    stse_ret = stse_generate_ecc_key_pair(
        &stse_handler,
        1,
        STSE_ECC_KT_NIST_P_256,
        255,
        slot_1_public_key);

But in neither case is the meaning of this parameter clarified.

Where can I find comprehensive documentation that explains the syntax and semantics of the I2C commands in detail?

[TDK]

For security products and other things subject to export restrictions you'll probably have to ask directly and possibly sign an NDA.

https://ols.st.com/s/

If you can't find it online, it's probably not publicly available. Usually intentional.