[#PKCS5_pbkdf2_set_ex]
= PKCS5_pbkdf2_set_ex
:mrdocs:

Build an X509_ALGOR describing PBKDF2 parameters (library‐context aware).

== Synopsis

Declared in `<openssl/x509.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:X509_ALGOR.adoc[X509_ALGOR]*
PKCS5_pbkdf2_set_ex(
    int iter,
    unsigned char* salt,
    int saltlen,
    int prf_nid,
    int keylen,
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx);
----

== Return Value

New X509_ALGOR on success, or NULL on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *iter*
| PBKDF2 iteration count.
| *salt*
| Salt octets; may be NULL to generate a random salt of `saltlen.`
| *saltlen*
| Salt length in bytes.
| *prf_nid*
| NID of the PRF digest (for example NID_hmacWithSHA256); <= 0 selects the default.
| *keylen*
| Derived key length in bytes to encode in the parameters; <= 0 omits it.
| *libctx*
| Library context used for any random salt generation; NULL uses the default.
|===


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