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.\" ========================================================================
.\"
.IX Title "PKCS12_CREATE 3ossl"
.TH PKCS12_CREATE 3ossl "2026-01-16" "3.5.1" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
PKCS12_create, PKCS12_create_ex, PKCS12_create_cb, PKCS12_create_ex2 \- create a PKCS#12 structure
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/pkcs12.h>
\&
\& PKCS12 *PKCS12_create(const char *pass, const char *name, EVP_PKEY *pkey,
\&                       X509 *cert, STACK_OF(X509) *ca,
\&                       int nid_key, int nid_cert, int iter, int mac_iter, int keytype);
\& PKCS12 *PKCS12_create_ex(const char *pass, const char *name, EVP_PKEY *pkey,
\&                          X509 *cert, STACK_OF(X509) *ca, int nid_key, int nid_cert,
\&                          int iter, int mac_iter, int keytype,
\&                          OSSL_LIB_CTX *ctx, const char *propq);
\&
\& typedef int PKCS12_create_cb(PKCS12_SAFEBAG *bag, void *cbarg);
\&
\& PKCS12 *PKCS12_create_ex2(const char *pass, const char *name, EVP_PKEY *pkey,
\&                           X509 *cert, STACK_OF(X509) *ca, int nid_key, int nid_cert,
\&                           int iter, int mac_iter, int keytype,
\&                           OSSL_LIB_CTX *ctx, const char *propq,
\&                           PKCS12_create_cb *cb, void *cbarg);
\&=head1 DESCRIPTION
.Ve
.PP
\&\fBPKCS12_create()\fR creates a PKCS#12 structure.
.PP
\&\fIpass\fR is the passphrase to use. \fIname\fR is the \fBfriendlyName\fR to use for
the supplied certificate and key. \fIpkey\fR is the private key to include in
the structure and \fIcert\fR its corresponding certificates. \fIca\fR, if not \fB\s-1NULL\s0\fR
is an optional set of certificates to also include in the structure.
.PP
\&\fInid_key\fR and \fInid_cert\fR are the encryption algorithms that should be used
for the key and certificate respectively. The modes
\&\s-1GCM, CCM, XTS,\s0 and \s-1OCB\s0 are unsupported. \fIiter\fR is the encryption algorithm
iteration count to use and \fImac_iter\fR is the \s-1MAC\s0 iteration count to use.
\&\fIkeytype\fR is the type of key.
.PP
\&\fBPKCS12_create_ex()\fR is identical to \fBPKCS12_create()\fR but allows for a library context
\&\fIctx\fR and property query \fIpropq\fR to be used to select algorithm implementations.
.PP
\&\fBPKCS12_create_ex2()\fR is identical to \fBPKCS12_create_ex()\fR but allows for a user defined
callback \fIcb\fR of type \fBPKCS12_create_cb\fR to be specified and also allows for an
optional argument \fIcbarg\fR to be passed back to the callback.
.PP
The \fIcb\fR if specified will be called for every safebag added to the
\&\s-1PKCS12\s0 structure and allows for optional application processing on the associated
safebag. For example one such use could be to add attributes to the safebag.
.SH "NOTES"
.IX Header "NOTES"
The parameters \fInid_key\fR, \fInid_cert\fR, \fIiter\fR, \fImac_iter\fR and \fIkeytype\fR
can all be set to zero and sensible defaults will be used.
.PP
These defaults are: \s-1AES\s0 password based encryption (\s-1PBES2\s0 with \s-1PBKDF2\s0 and
\&\s-1AES\-256\-CBC\s0) for private keys and certificates, the \s-1PBKDF2\s0 and \s-1MAC\s0 key
derivation iteration count of \fB\s-1PKCS12_DEFAULT_ITER\s0\fR (currently 2048), and
\&\s-1MAC\s0 algorithm \s-1HMAC\s0 with \s-1SHA2\-256.\s0 The \s-1MAC\s0 key derivation algorithm used
for the outer PKCS#12 structure is \s-1PKCS12KDF.\s0
.PP
The default \s-1MAC\s0 iteration count is 1 in order to retain compatibility with
old software which did not interpret \s-1MAC\s0 iteration counts. If such compatibility
is not required then \fImac_iter\fR should be set to \s-1PKCS12_DEFAULT_ITER.\s0
.PP
\&\fIkeytype\fR adds a flag to the store private key. This is a non standard extension
that is only currently interpreted by \s-1MSIE.\s0 If set to zero the flag is omitted,
if set to \fB\s-1KEY_SIG\s0\fR the key can be used for signing only, if set to \fB\s-1KEY_EX\s0\fR
it can be used for signing and encryption. This option was useful for old
export grade software which could use signing only keys of arbitrary size but
had restrictions on the permissible sizes of keys which could be used for
encryption.
.PP
If \fIname\fR is \fB\s-1NULL\s0\fR and \fIcert\fR contains an \fIalias\fR then this will be
used for the corresponding \fBfriendlyName\fR in the \s-1PKCS12\s0 structure instead.
Similarly, if \fIpkey\fR is \s-1NULL\s0 and \fIcert\fR contains a \fIkeyid\fR then this will be
used for the corresponding \fBlocalKeyID\fR in the \s-1PKCS12\s0 structure instead of the
id calculated from the \fIpkey\fR.
.PP
For all certificates in \fIca\fR then if a certificate contains an \fIalias\fR or
\&\fIkeyid\fR then this will be used for the corresponding \fBfriendlyName\fR or
\&\fBlocalKeyID\fR in the \s-1PKCS12\s0 structure.
.PP
Either \fIpkey\fR, \fIcert\fR or both can be \fB\s-1NULL\s0\fR to indicate that no key or
certificate is required. In previous versions both had to be present or
a fatal error is returned.
.PP
\&\fInid_key\fR or \fInid_cert\fR can be set to \-1 indicating that no encryption
should be used.
.PP
\&\fImac_iter\fR can be set to \-1 and the \s-1MAC\s0 will then be omitted entirely.
This can be useful when running with the \s-1FIPS\s0 provider as the \s-1PKCS12KDF\s0
is not a \s-1FIPS\s0 approvable algorithm.
.PP
\&\fBPKCS12_create()\fR makes assumptions regarding the encoding of the given pass
phrase.
See \fBpassphrase\-encoding\fR\|(7) for more information.
.PP
If \fIcb\fR is specified, then it should return 1 for success and \-1 for a fatal error.
A return of 0 is intended to mean to not add the bag after all.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBPKCS12_create()\fR returns a valid \fB\s-1PKCS12\s0\fR structure or \s-1NULL\s0 if an error occurred.
.SH "CONFORMING TO"
.IX Header "CONFORMING TO"
\&\s-1IETF RFC 7292\s0 (<https://tools.ietf.org/html/rfc7292>)
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1\fBEVP_KDF\-PKCS12KDF\s0\fR\|(7),
\&\fBd2i_PKCS12\fR\|(3),
\&\s-1\fBOSSL_PROVIDER\-FIPS\s0\fR\|(7),
\&\fBpassphrase\-encoding\fR\|(7)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBPKCS12_create_ex()\fR was added in OpenSSL 3.0.
\&\fBPKCS12_create_ex2()\fR was added in OpenSSL 3.2.
.PP
The defaults for encryption algorithms, \s-1MAC\s0 algorithm, and the \s-1MAC\s0 key
derivation iteration count were changed in OpenSSL 3.0 to more modern
standards.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2002\-2024 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
