[#PKCS12_gen_mac]
= PKCS12_gen_mac
:mrdocs:

Generate the HMAC for a PKCS#12 object using configured MAC parameters.

== Synopsis

Declared in `<openssl/pkcs12.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
PKCS12_gen_mac(
    xref:PKCS12.adoc[PKCS12]* p12,
    char const* pass,
    int passlen,
    unsigned char* mac,
    unsigned int* maclen);
----

== Return Value

1 on success, 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *p12*
| PKCS#12 structure with MAC parameters already set.
| *pass*
| Passphrase for the HMAC.
| *passlen*
| Length of `pass,` or ‐1 to use strlen().
| *mac*
| Buffer to receive the MAC value.
| *maclen*
| Address to receive MAC length in bytes on input and output.
|===


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