mirror of
https://github.com/openssl/openssl.git
synced 2024-12-15 06:01:37 +08:00
79b2a2f2ee
Reviewed-by: Paul Dale <pauli@openssl.org> (Merged from https://github.com/openssl/openssl/pull/17307)
107 lines
3.4 KiB
Plaintext
107 lines
3.4 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
X509_new, X509_new_ex,
|
|
X509_free, X509_up_ref,
|
|
X509_chain_up_ref,
|
|
OSSL_STACK_OF_X509_free
|
|
- X509 certificate ASN1 allocation and deallocation functions
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/x509.h>
|
|
|
|
X509 *X509_new(void);
|
|
X509 *X509_new_ex(OSSL_LIB_CTX *libctx, const char *propq);
|
|
void X509_free(X509 *a);
|
|
int X509_up_ref(X509 *a);
|
|
STACK_OF(X509) *X509_chain_up_ref(STACK_OF(X509) *x);
|
|
void OSSL_STACK_OF_X509_free(STACK_OF(X509) *certs);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
The X509 ASN1 allocation routines, allocate and free an
|
|
X509 structure, which represents an X509 certificate.
|
|
|
|
X509_new_ex() allocates and initializes a X509 structure with a
|
|
library context of I<libctx>, property query of I<propq> and a reference
|
|
count of B<1>. Many X509 functions such as X509_check_purpose(), and
|
|
X509_verify() use this library context to select which providers supply the
|
|
fetched algorithms (SHA1 is used internally). This created X509 object can then
|
|
be used when loading binary data using d2i_X509().
|
|
|
|
X509_new() is similar to X509_new_ex() but sets the library context
|
|
and property query to NULL. This results in the default (NULL) library context
|
|
being used for any X509 operations requiring algorithm fetches.
|
|
|
|
X509_free() decrements the reference count of B<X509> structure B<a> and
|
|
frees it up if the reference count is zero. If B<a> is NULL nothing is done.
|
|
|
|
X509_up_ref() increments the reference count of B<a>.
|
|
|
|
X509_chain_up_ref() increases the reference count of all certificates in
|
|
chain B<x> and returns a copy of the stack, or an empty stack if B<a> is NULL.
|
|
|
|
OSSL_STACK_OF_X509_free() deallocates the given list of pointers to
|
|
certificates after calling X509_free() on all its elements.
|
|
|
|
=head1 NOTES
|
|
|
|
The function X509_up_ref() 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.
|
|
|
|
The function X509_chain_up_ref() doesn't just up the reference count of
|
|
each certificate. It also returns a copy of the stack, using sk_X509_dup(),
|
|
but it serves a similar purpose: the returned chain persists after the
|
|
original has been freed.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
If the allocation fails, X509_new() returns NULL and sets an error
|
|
code that can be obtained by L<ERR_get_error(3)>.
|
|
Otherwise it returns a pointer to the newly allocated structure.
|
|
|
|
X509_up_ref() returns 1 for success and 0 for failure.
|
|
|
|
X509_chain_up_ref() returns a copy of the stack or NULL if an error occurred.
|
|
|
|
OSSL_STACK_OF_X509_free() has no return value.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<d2i_X509(3)>,
|
|
L<ERR_get_error(3)>,
|
|
L<X509_CRL_get0_by_serial(3)>,
|
|
L<X509_get0_signature(3)>,
|
|
L<X509_get_ext_d2i(3)>,
|
|
L<X509_get_extension_flags(3)>,
|
|
L<X509_get_pubkey(3)>,
|
|
L<X509_get_subject_name(3)>,
|
|
L<X509_get_version(3)>,
|
|
L<X509_NAME_add_entry_by_txt(3)>,
|
|
L<X509_NAME_ENTRY_get_object(3)>,
|
|
L<X509_NAME_get_index_by_NID(3)>,
|
|
L<X509_NAME_print_ex(3)>,
|
|
L<X509_sign(3)>,
|
|
L<X509V3_get_d2i(3)>,
|
|
L<X509_verify_cert(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
X509_new_ex() was added in OpenSSL 3.0.
|
|
|
|
OSSL_STACK_OF_X509_free() was added in OpenSSL 3.1.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2002-2021 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
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|