.\" $OpenBSD: X509_new.3,v 1.15 2018/03/27 17:35:50 schwarze Exp $ .\" full merge up to: OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400 .\" .\" This file was written by Dr. Stephen Henson . .\" Copyright (c) 2002, 2006, 2015, 2016 The OpenSSL Project. .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in .\" the documentation and/or other materials provided with the .\" distribution. .\" .\" 3. All advertising materials mentioning features or use of this .\" software must display the following acknowledgment: .\" "This product includes software developed by the OpenSSL Project .\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)" .\" .\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to .\" endorse or promote products derived from this software without .\" prior written permission. For written permission, please contact .\" openssl-core@openssl.org. .\" .\" 5. Products derived from this software may not be called "OpenSSL" .\" nor may "OpenSSL" appear in their names without prior written .\" permission of the OpenSSL Project. .\" .\" 6. 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IN NO EVENT SHALL THE OpenSSL PROJECT OR .\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, .\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; .\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, .\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED .\" OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd $Mdocdate: March 27 2018 $ .Dt X509_NEW 3 .Os .Sh NAME .Nm X509_new , .Nm X509_free , .Nm X509_up_ref , .Nm X509_chain_up_ref .Nd X.509 certificate object .Sh SYNOPSIS .In openssl/x509.h .Ft X509 * .Fn X509_new void .Ft void .Fo X509_free .Fa "X509 *a" .Fc .Ft int .Fo X509_up_ref .Fa "X509 *a" .Fc .Ft STACK_OF(X509) * .Fo X509_chain_up_ref .Fa "STACK_OF(X509) *chain" .Fc .Sh DESCRIPTION .Fn X509_new allocates and initializes an empty .Vt X509 object with reference count 1. It represents an ASN.1 .Vt 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. .Pp .Fn X509_free decrements the reference count of the .Vt X509 structure .Fa a and frees it up if the reference count reaches 0. If .Fa a is a .Dv NULL pointer, no action occurs. .Pp .Fn X509_up_ref increments the reference count of .Fa a by 1. 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. .Pp .Fn X509_chain_up_ref performs a shallow copy of the given .Fa chain using .Fn sk_X509_dup and increments the reference count of each contained certificate by 1. Its purpose is similar to .Fn X509_up_ref : The returned chain persists after the original is freed. .Pp The object .Vt X509_INFO , which can hold a certificate, the corresponding private key, and a certificate revocation list, is not yet documented. .Sh RETURN VALUES If the allocation fails, .Fn X509_new returns .Dv NULL and sets an error code that can be obtained by .Xr ERR_get_error 3 . Otherwise it returns a pointer to the newly allocated structure. .Pp .Fn X509_up_ref returns 1 for success or 0 for failure. .Pp .Fn X509_chain_up_ref returns the copy of the .Fa chain or .Dv NULL if an error occurs. .Sh SEE ALSO .Xr AUTHORITY_KEYID_new 3 , .Xr BASIC_CONSTRAINTS_new 3 , .Xr crypto 3 , .Xr d2i_X509 3 , .Xr ERR_get_error 3 , .Xr X509_ALGOR_new 3 , .Xr X509_CRL_new 3 , .Xr X509_EXTENSION_new 3 , .Xr X509_NAME_new 3 , .Xr X509_REQ_new 3 , .Xr X509_SIG_new 3 .Sh STANDARDS RFC 5280: Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile .Sh HISTORY .Fn X509_new and .Fn X509_free appeared in SSLeay 0.4 or earlier and have been available since .Ox 2.4 . .Pp .Fn X509_up_ref first appeared in OpenSSL 1.1.0 and has been available since .Ox 6.1 . .Pp .Fn X509_chain_up_ref first appeared in OpenSSL 1.0.2 and has been available since .Ox 6.3 . .Sh BUGS 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 .Lk https://www.cs.auckland.ac.nz/~pgut001/pubs/x509guide.txt\ "X.509 Style Guide" that .An Peter Gutmann published in 2000.