PKCS12_GEN_MAC(3ossl)

📦 version 15.1, in freebsd 15.1

💖 PKCS12_GEN_MAC(3ossl) — OpenSSL manual page, bestie edition ✨

okay so this is the OpenSSL manual for PKCS12_GEN_MAC(3ossl), and it's all about creating and manipulating a PKCS#12 MAC structure. Yes, MAC as in message authentication code — not the lipstick, not the apple. cryptography slay.

🎀 NAME

PKCS12_gen_mac, PKCS12_setup_mac, PKCS12_set_mac, PKCS12_set_pbmac1_pbkdf2, PKCS12_verify_mac, PKCS12_get0_mac — Functions to create and manipulate a PKCS#12 MAC structure.

✨ SYNOPSIS

#include <openssl/pkcs12.h>

int PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
                   unsigned char *mac, unsigned int *maclen);
int PKCS12_verify_mac(PKCS12 *p12, const char *pass, int passlen);
int PKCS12_set_mac(PKCS12 *p12, const char *pass, int passlen,
                   unsigned char *salt, int saltlen, int iter,
                   const EVP_MD *md_type);
int PKCS12_set_pbmac1_pbkdf2(PKCS12 *p12, const char *pass, int passlen,
                                  unsigned char *salt, int saltlen, int iter,
                                  const EVP_MD *md_type,
                                  const char *prf_md_name);
int PKCS12_setup_mac(PKCS12 *p12, int iter, unsigned char *salt,
                     int saltlen, const EVP_MD *md_type);

void PKCS12_get0_mac(const ASN1_OCTET_STRING **pmac,
                     const X509_ALGOR **pmacalg,
                     const ASN1_OCTET_STRING **psalt,
                     const ASN1_INTEGER **piter,
                     const PKCS12 *p12);

🦋 DESCRIPTION

PKCS12_gen_mac() generates an HMAC over the entire PKCS#12 object using the supplied password along with a set of already configured parameters. The default key generation mechanism used is PKCS12KDF. periodt.

PKCS12_verify_mac() verifies the PKCS#12 object's HMAC using the supplied password. It's giving trust but verify, bestie.

PKCS12_setup_mac() sets the MAC part of the PKCS#12 structure with the supplied parameters.

PKCS12_set_mac() sets the MAC and MAC parameters into the PKCS#12 object. PKCS12_set_pbmac1_pbkdf2() sets the MAC and MAC parameters into the PKCS#12 object when PBMAC1 with PBKDF2 is used for protection of the PKCS#12 object.

So here's the little cast of parameters, and yes they matter:

  • pass — the passphrase to use in the HMAC.
  • salt — the salt value to use.
  • iter — the iteration count.
  • md_type — the message digest function to use.
  • prf_md_name — specifies the digest used for the PBKDF2 in PBMAC1 KDF.

PKCS12_get0_mac() retrieves any included MAC value, X509_ALGOR object, salt, and iter count from the PKCS12 object. get into it.

🌸 NOTES

If salt is NULL then a suitable salt will be generated and used.
If iter is 1 then an iteration count will be omitted from the PKCS#12 structure.
PKCS12_gen_mac(), PKCS12_verify_mac(), PKCS12_set_mac() and PKCS12_set_pbmac1_pbkdf2() make assumptions regarding the encoding of the given passphrase. See passphrase-encoding(7) for more information.

iykyk — passphrase encoding is lowkey important.

🫶 RETURN VALUES

All functions returning an integer return 1 on success and 0 if an error occurred. 1 is slay, 0 is not the vibe.

👑 CONFORMING TO

IETF RFC 7292 (<https://tools.ietf.org/html/rfc7292>) and IETF RFC 9579 (<https://tools.ietf.org/html/rfc9579>). standards icon behavior.

🌈 SEE ALSO

🦋 HISTORY

The PKCS12_set_pbmac1_pbkdf2 function was added in OpenSSL 3.4. new-ish era, bestie.

Copyright 2021-2024 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.

okay that's the whole page — source/version is OpenSSL 3.5.6, dated 2026-04-07. bye bestie, go MAC responsibly 💖✨

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