---
name: "PKCS12_add_cert"
section: "3ssl"
platform: "linux"
package: "openssl"
version: "3.6.5-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/PKCS12_add_cert"
---

# PKCS12\_add\_cert(3ssl)

Add an object to a set of PKCS#12 safeBags

## NAME

PKCS12\_add\_cert, PKCS12\_add\_key, PKCS12\_add\_key\_ex, PKCS12\_add\_secret - Add an object to a set of PKCS#12 safeBags

## SYNOPSIS

```
 #include <openssl/pkcs12.h>
 PKCS12_SAFEBAG *PKCS12_add_cert(STACK_OF(PKCS12_SAFEBAG) **pbags, X509 *cert);
 PKCS12_SAFEBAG *PKCS12_add_key(STACK_OF(PKCS12_SAFEBAG) **pbags,
                               EVP_PKEY *key, int key_usage, int iter,
                               int key_nid, const char *pass);
 PKCS12_SAFEBAG *PKCS12_add_key_ex(STACK_OF(PKCS12_SAFEBAG) **pbags,
                                   EVP_PKEY *key, int key_usage, int iter,
                                   int key_nid, const char *pass,
                                   OSSL_LIB_CTX *ctx, const char *propq);
 PKCS12_SAFEBAG *PKCS12_add_secret(STACK_OF(PKCS12_SAFEBAG) **pbags,
                                  int nid_type, const unsigned char *value, int len);
```

## DESCRIPTION

These functions create a new **PKCS12\_SAFEBAG** and add it to the set of safeBags in *pbags*.

**PKCS12\_add\_cert()** creates a PKCS#12 certBag containing the supplied certificate and adds this to the set of PKCS#12 safeBags.

**PKCS12\_add\_key()** creates a PKCS#12 keyBag (unencrypted) or a pkcs8shroudedKeyBag (encrypted) containing the supplied **EVP\_PKEY** and adds this to the set of PKCS#12 safeBags. If *key\_nid* is not -1 then the key is encrypted with the supplied algorithm, using *pass* as the passphrase and *iter* as the iteration count. If *iter* is zero then a default value for iteration count of 2048 is used.

**PKCS12\_add\_key\_ex()** is identical to **PKCS12\_add\_key()** but allows for a library context *ctx* and property query *propq* to be used to select algorithm implementations.

**PKCS12\_add\_secret()** creates a PKCS#12 secretBag with an OID corresponding to the supplied *nid\_type* containing the supplied value as an ASN1 octet string. This is then added to the set of PKCS#12 safeBags.

## NOTES

If a certificate contains an *alias* or a *keyid* then this will be used for the corresponding **friendlyName** or **localKeyID** in the PKCS12 structure.

**PKCS12\_add\_key()** makes assumptions regarding the encoding of the given pass phrase. See **passphrase-encoding**(7) for more information.

## RETURN VALUES

A valid **PKCS12\_SAFEBAG** structure or NULL if an error occurred.

## CONFORMING TO

IETF RFC 7292 (\<https://tools.ietf.org/html/rfc7292\>)

## SEE ALSO

**PKCS12\_create**(3)

## HISTORY

**PKCS12\_add\_secret()** and **PKCS12\_add\_key\_ex()** were added in OpenSSL 3.0.

## COPYRIGHT

Copyright 2020-2021 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\>.