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X509_NEW(3) Library Functions Manual X509_NEW(3)


X509_new, X509_free, X509_up_refX.509 certificate object


#include <openssl/x509.h>
X509 *
X509_free(X509 *a);
X509_up_ref(X509 *a);


X509_new() allocates and initializes an empty X509 object with reference count 1. It represents an ASN.1 Certificate structure defined in RFC 5280 section 4.1. It can hold a public key together with information about the person, organization, device, or function the associated private key belongs to.
X509_free() decrements the reference count of the X509 structure a and frees it up if the reference count reaches 0. If a is a NULL pointer, no action occurs.
X509_up_ref() increments the reference count of a. This function is 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 object X509_INFO, which can hold a certificate, the corresponding private key, and a certificate revocation list, is not yet documented.


If the allocation fails, X509_new() returns NULL and sets an error code that can be obtained by ERR_get_error(3). Otherwise it returns a pointer to the newly allocated structure.
X509_up_ref() returns 1 for success or 0 for failure.


AUTHORITY_KEYID_new(3), BASIC_CONSTRAINTS_new(3), crypto(3), d2i_X509(3), ERR_get_error(3), X509_ALGOR_new(3), X509_CRL_new(3), X509_EXTENSION_new(3), X509_NAME_new(3), X509_REQ_new(3), X509_SIG_new(3)


RFC 5280: Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile


X509_new() and X509_free() are available in all versions of SSLeay and OpenSSL.


The X.509 public key infrastructure and its data types contain too many design bugs to list them. For lots of examples, see the classic X.509 Style Guide that Peter Gutmann published in 2000.
December 25, 2016 OpenBSD-current