X509_new, X509_free, X509_up_ref - X509 certificate ASN1 allocation functions
#include <openssl/x509.h> X509 *X509_new(void); void X509_free(X509 *a); void X509_up_ref(X509 *a); STACK_OF(X509) *X509_chain_up_ref(STACK_OF(X509) *x);
The X509 ASN1 allocation routines, allocate and free an X509 structure, which represents an X509 certificate.
X509_new() allocates and initializes a X509 structure with reference count 1.
X509_free() decrements the reference count of X509 structure a and frees it up if the reference count is zero. If a is NULL nothing is done.
X509_up_ref() increments the reference count of a.
X509_chain_up_ref() increases the reference count of all certificates in chain x and returns a copy of the stack.
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.
If the allocation fails, X509_new() returns NULL and sets an error code that can be obtained by ERR_get_error. Otherwise it returns a pointer to the newly allocated structure.
X509_free() and X509_up_ref() do not return a value.
X509_chain_up_ref() returns a copy of the stack or NULL if an error occurred.
d2i_X509, ERR_get_error, X509_CRL_get0_by_serial, X509_get0_signature, X509_get_ext_d2i, X509_get_extension_flags, X509_get_pubkey, X509_get_subject_name, X509_get_version, X509_NAME_add_entry_by_txt, X509_NAME_ENTRY_get_object, X509_NAME_get_index_by_NID, X509_NAME_print_ex, X509_sign, X509V3_get_d2i, X509_verify_cert