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.\" ========================================================================
.\"
.IX Title "X509_NEW 3"
.TH X509_NEW 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
X509_chain_up_ref, X509_new, X509_free, X509_up_ref \- X509 certificate ASN1 allocation functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509.h>
\&
\& X509 *X509_new(void);
\& void X509_free(X509 *a);
\& int X509_up_ref(X509 *a);
\& STACK_OF(X509) *X509_chain_up_ref(STACK_OF(X509) *x);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The X509 \s-1ASN1\s0 allocation routines, allocate and free an
X509 structure, which represents an X509 certificate.
.PP
\&\fIX509_new()\fR allocates and initializes a X509 structure with reference count
\&\fB1\fR.
.PP
\&\fIX509_free()\fR decrements the reference count of \fBX509\fR structure \fBa\fR and
frees it up if the reference count is zero. If \fBa\fR is \s-1NULL\s0 nothing is done.
.PP
\&\fIX509_up_ref()\fR increments the reference count of \fBa\fR.
.PP
\&\fIX509_chain_up_ref()\fR increases the reference count of all certificates in
chain \fBx\fR and returns a copy of the stack.
.SH "NOTES"
.IX Header "NOTES"
The function \fIX509_up_ref()\fR if useful if a certificate structure is being
used by several different operations each of which will free it up after
use: this avoids the need to duplicate the entire certificate structure.
.PP
The function \fIX509_chain_up_ref()\fR doesn't just up the reference count of
each certificate it also returns a copy of the stack, using \fIsk_X509_dup()\fR,
but it serves a similar purpose: the returned chain persists after the
original has been freed.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
If the allocation fails, \fIX509_new()\fR returns \fB\s-1NULL\s0\fR and sets an error
code that can be obtained by \fIERR_get_error\fR\|(3).
Otherwise it returns a pointer to the newly allocated structure.
.PP
\&\fIX509_up_ref()\fR returns 1 for success and 0 for failure.
.PP
\&\fIX509_chain_up_ref()\fR returns a copy of the stack or \fB\s-1NULL\s0\fR if an error
occurred.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fId2i_X509\fR\|(3),
\&\fIERR_get_error\fR\|(3),
\&\fIX509_CRL_get0_by_serial\fR\|(3),
\&\fIX509_get0_signature\fR\|(3),
\&\fIX509_get_ext_d2i\fR\|(3),
\&\fIX509_get_extension_flags\fR\|(3),
\&\fIX509_get_pubkey\fR\|(3),
\&\fIX509_get_subject_name\fR\|(3),
\&\fIX509_get_version\fR\|(3),
\&\fIX509_NAME_add_entry_by_txt\fR\|(3),
\&\fIX509_NAME_ENTRY_get_object\fR\|(3),
\&\fIX509_NAME_get_index_by_NID\fR\|(3),
\&\fIX509_NAME_print_ex\fR\|(3),
\&\fIX509_sign\fR\|(3),
\&\fIX509V3_get_d2i\fR\|(3),
\&\fIX509_verify_cert\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2002\-2016 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (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>.