[#CHKDF_HMAC_SHA256_L32-2constructor]
= xref:CHKDF_HMAC_SHA256_L32.adoc[CHKDF_HMAC_SHA256_L32]::CHKDF_HMAC_SHA256_L32
:relfileprefix: ../
:mrdocs:

Run the HKDF extract step over the input keying material and salt.

== Synopsis

Declared in `<crypto/hkdf_sha256_32.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
CHKDF_HMAC_SHA256_L32(
    unsigned char const* ikm,
    size_t ikmlen,
    std::string const& salt);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ikm*
| Pointer to the input keying material.
| *ikmlen*
| Length of the input keying material in bytes.
| *salt*
| Optional salt value used during extraction.
|===


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