[#PKCS12_set_mac]
= PKCS12_set_mac
:mrdocs:

Compute and store the MAC and MAC parameters in a PKCS#12 object.

== Synopsis

Declared in `<openssl/pkcs12.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
PKCS12_set_mac(
    xref:PKCS12.adoc[PKCS12]* p12,
    char const* pass,
    int passlen,
    unsigned char* salt,
    int saltlen,
    int iter,
    xref:EVP_MD.adoc[EVP_MD] const* md_type);
----

== Return Value

1 on success, 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *p12*
| PKCS#12 structure to update.
| *pass*
| Passphrase for the HMAC.
| *passlen*
| Length of `pass,` or ‐1 to use strlen().
| *salt*
| Salt for MAC key derivation, or NULL to generate one.
| *saltlen*
| Length of `salt` in bytes.
| *iter*
| Iteration count for MAC key derivation (1 omits the count from the structure).
| *md_type*
| Message digest for the HMAC.
|===


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