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109 lines
3.4 KiB
Plaintext
109 lines
3.4 KiB
Plaintext
=pod
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=head1 NAME
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X509_new, X509_new_ex,
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X509_free, X509_up_ref,
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X509_chain_up_ref,
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OSSL_STACK_OF_X509_free
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- X509 certificate ASN1 allocation and deallocation functions
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=head1 SYNOPSIS
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#include <openssl/x509.h>
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X509 *X509_new(void);
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X509 *X509_new_ex(OSSL_LIB_CTX *libctx, const char *propq);
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void X509_free(X509 *a);
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int X509_up_ref(X509 *a);
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STACK_OF(X509) *X509_chain_up_ref(STACK_OF(X509) *x);
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void OSSL_STACK_OF_X509_free(STACK_OF(X509) *certs);
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=head1 DESCRIPTION
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The X509 ASN1 allocation routines allocate and free an
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X509 structure, which represents an X509 certificate.
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X509_new_ex() allocates and initializes a X509 structure with a
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library context of I<libctx>, property query of I<propq> and a reference
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count of B<1>. Many X509 functions such as X509_check_purpose(), and
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X509_verify() use this library context to select which providers supply the
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fetched algorithms (SHA1 is used internally). This created X509 object can then
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be used when loading binary data using d2i_X509().
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X509_new() is similar to X509_new_ex() but sets the library context
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and property query to NULL. This results in the default (NULL) library context
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being used for any X509 operations requiring algorithm fetches.
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X509_free() decrements the reference count of B<X509> structure B<a> and
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frees it up if the reference count is zero. If the argument is NULL,
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nothing is done.
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X509_up_ref() increments the reference count of B<a>.
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X509_chain_up_ref() increases the reference count of all certificates in
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chain B<x> and returns a copy of the stack, or an empty stack if B<a> is NULL.
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OSSL_STACK_OF_X509_free() deallocates the given list of pointers to
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certificates after calling X509_free() on all its elements.
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If the argument is NULL, nothing is done.
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=head1 NOTES
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The function X509_up_ref() if useful if a certificate structure is being
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used by several different operations each of which will free it up after
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use: this avoids the need to duplicate the entire certificate structure.
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The function X509_chain_up_ref() doesn't just up the reference count of
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each certificate. It also returns a copy of the stack, using sk_X509_dup(),
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but it serves a similar purpose: the returned chain persists after the
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original has been freed.
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=head1 RETURN VALUES
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If the allocation fails, X509_new() returns NULL and sets an error
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code that can be obtained by L<ERR_get_error(3)>.
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Otherwise it returns a pointer to the newly allocated structure.
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X509_up_ref() returns 1 for success and 0 for failure.
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X509_chain_up_ref() returns a copy of the stack or NULL if an error occurred.
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OSSL_STACK_OF_X509_free() has no return value.
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=head1 SEE ALSO
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L<d2i_X509(3)>,
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L<ERR_get_error(3)>,
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L<X509_CRL_get0_by_serial(3)>,
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L<X509_get0_signature(3)>,
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L<X509_get_ext_d2i(3)>,
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L<X509_get_extension_flags(3)>,
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L<X509_get_pubkey(3)>,
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L<X509_get_subject_name(3)>,
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L<X509_get_version(3)>,
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L<X509_NAME_add_entry_by_txt(3)>,
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L<X509_NAME_ENTRY_get_object(3)>,
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L<X509_NAME_get_index_by_NID(3)>,
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L<X509_NAME_print_ex(3)>,
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L<X509_sign(3)>,
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L<X509V3_get_d2i(3)>,
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L<X509_verify_cert(3)>
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=head1 HISTORY
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X509_new_ex() was added in OpenSSL 3.0.
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OSSL_STACK_OF_X509_free() was added in OpenSSL 3.2.
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=head1 COPYRIGHT
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Copyright 2002-2024 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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