[#PKCS5_pbkdf2_set]
= PKCS5_pbkdf2_set
:mrdocs:

Build an X509_ALGOR describing PBKDF2 key‐derivation parameters.

== Synopsis

Declared in `<openssl/x509.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:X509_ALGOR.adoc[X509_ALGOR]*
PKCS5_pbkdf2_set(
    int iter,
    unsigned char* salt,
    int saltlen,
    int prf_nid,
    int keylen);
----

== Return Value

Newly allocated X509_ALGOR, or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *iter*
| PBKDF2 iteration count.
| *salt*
| Salt bytes, or NULL to generate/omit as implemented.
| *saltlen*
| Length of `salt` in bytes.
| *prf_nid*
| NID of the PRF digest (e.g. NID_hmacWithSHA256), or 0 for the default.
| *keylen*
| Derived key length in bytes, or 0 if omitted from the parameters.
|===


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