Struct KdfCtx 

pub struct KdfCtx { /* private fields */ }

A key-derivation context (EVP_KDF_CTX*).

!Clone — create a new context for each derive operation.

Implementations

impl KdfCtx

pub fn new(alg: &KdfAlg) -> Result<Self, ErrorStack>

Create a new context from an algorithm descriptor.

Errors

pub fn derive( &mut self, out: &mut [u8], params: &Params<'_>, ) -> Result<(), ErrorStack>

Derive key material into out.

Parameters are supplied at derive time via the params argument.

Errors

pub fn set_params(&mut self, params: &Params<'_>) -> Result<(), ErrorStack>

Update parameters on this KDF context without destroying it.

Use this to change algorithm-specific settings (e.g. HKDF mode, salt) on an already-initialised context instead of creating a new one.

Errors

Returns Err if EVP_KDF_CTX_set_params fails (e.g. unknown key, type mismatch, or the algorithm does not support the parameter).

pub fn get_params(&self, params: &mut Params<'_>) -> Result<(), ErrorStack>

Retrieve parameter values from this KDF context.

Build a Params with placeholder values for the keys you want, call this method, then read back with params.get_*.

Errors

Returns Err if EVP_KDF_CTX_get_params fails.

pub fn size(&self) -> usize

Return the output length of this KDF (if fixed), or usize::MAX if variable.

Trait Implementations

impl Drop for KdfCtx

fn drop(&mut self)

Executes the destructor for this type.

impl Send for KdfCtx