[#CHKDF_HMAC_SHA256_L32-2constructor]
= xref:CHKDF_HMAC_SHA256_L32.adoc[CHKDF&lowbar;HMAC&lowbar;SHA256&lowbar;L32]::CHKDF&lowbar;HMAC&lowbar;SHA256&lowbar;L32
:relfileprefix: ../
:mrdocs:

Run the HKDF extract step over the input keying material and salt&period;

== Synopsis

Declared in `&lt;crypto&sol;hkdf&lowbar;sha256&lowbar;32&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
CHKDF&lowbar;HMAC&lowbar;SHA256&lowbar;L32(
    unsigned char const* ikm,
    size&lowbar;t ikmlen,
    std::string const& salt);
----

== Parameters

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


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