5 X509_new, X509_free, X509_up_ref - X509 certificate ASN1 allocation functions
9 #include <openssl/x509.h>
12 void X509_free(X509 *a);
13 void X509_up_ref(X509 *a);
14 STACK_OF(X509) *X509_chain_up_ref(STACK_OF(X509) *x);
18 The X509 ASN1 allocation routines, allocate and free an
19 X509 structure, which represents an X509 certificate.
21 X509_new() allocates and initializes a X509 structure with reference count
24 X509_free() decrements the reference count of B<X509> structure B<a> and
25 frees it up if the reference count is zero. If B<a> is NULL nothing is done.
27 X509_up_ref() increments the reference count of B<a>.
29 X509_chain_up_ref() increases the reference count of all certificates in
30 chain B<x> and returns a copy of the stack.
34 The function X509_up_ref() if useful if a certificate structure is being
35 used by several different operations each of which will free it up after
36 use: this avoids the need to duplicate the entire certificate structure.
38 The function X509_chain_up_ref() doesn't just up the reference count of
39 each certificate it also returns a copy of the stack, using sk_X509_dup(),
40 but it serves a similar purpose: the returned chain persists after the
41 original has been freed.
45 If the allocation fails, X509_new() returns B<NULL> and sets an error
46 code that can be obtained by L<ERR_get_error(3)>.
47 Otherwise it returns a pointer to the newly allocated structure.
49 X509_free() and X509_up_ref() do not return a value.
51 X509_chain_up_ref() returns a copy of the stack or B<NULL> if an error
58 L<X509_CRL_get0_by_serial(3)>,
59 L<X509_get0_signature(3)>,
60 L<X509_get_ext_d2i(3)>,
61 L<X509_get_extension_flags(3)>,
62 L<X509_get_pubkey(3)>,
63 L<X509_get_subject_name(3)>,
64 L<X509_get_version(3)>,
65 L<X509_NAME_add_entry_by_txt(3)>,
66 L<X509_NAME_ENTRY_get_object(3)>,
67 L<X509_NAME_get_index_by_NID(3)>,
68 L<X509_NAME_print_ex(3)>,
71 L<X509_verify_cert(3)>