Query regarding impl_kdf_ctr() in libkcapi code

[shivania2]

@smuellerDD I have an query regarding implementation of impl_kdf_ctr() in libkcapi code.

Why are we defining the impl_kdf_ctr() in libkcapi code, instead we can directly call the crypto_kdf108_ctr_generate function from kernel. It will ensure that we are using the correct implementation and will always be in sync with kernel code.

[smuellerDD]

Am Montag, 24. Februar 2025, 09:27:59 Mitteleuropäische Normalzeit schrieb shivania2: Hi shivania2,

shivania2 created an issue (smuellerDD/libkcapi#192) @smuellerDD I have an query regarding implementation of impl_kdf_ctr() in libkcapi code. Why are we defining the impl_kdf_ctr() in libkcapi code, instead we can directly call the [crypto_kdf108_ctr_generate](https://elixir.bootlin.com/linux/v6.12.1/C/ide nt/crypto_kdf108_ctr_generate) function from kernel. It will ensure that we are using the correct implementation and will always be in sync with kernel code.

There is no AF_ALG interface to externalize KDFs into user space. Ciao Stephan