[#PKCS5_pbe2_set]
= PKCS5_pbe2_set
:mrdocs:

Build a PKCS#5 PBES2 AlgorithmIdentifier for `cipher` with PBKDF2.

== Synopsis

Declared in `<openssl/x509.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:X509_ALGOR.adoc[X509_ALGOR]*
PKCS5_pbe2_set(
    xref:EVP_CIPHER-07.adoc[EVP_CIPHER] const* cipher,
    int iter,
    unsigned char* salt,
    int saltlen);
----

== Return Value

New X509_ALGOR encoding PBES2 parameters, or NULL on error; free with X509_ALGOR_free().

== Parameters

[cols="1,4"]
|===
| Name| Description
| *cipher*
| Content‐encryption cipher for the PBES2 encryption scheme.
| *iter*
| PBKDF2 iteration count; <=0 selects the default.
| *salt*
| Optional salt bytes; NULL generates a random salt of `saltlen` (default 16 if 0).
| *saltlen*
| Salt length in bytes when `salt` is NULL / length of `salt.`
|===


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