path: root/lib/libcrypto/man/X509_new.3

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.Dd $Mdocdate: August 20 2019 $
.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.
.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 PKCS8_PRIV_KEY_INFO_new 3 ,
.Xr X509_ALGOR_new 3 ,
.Xr X509_ATTRIBUTE_new 3 ,
.Xr X509_check_ca 3 ,
.Xr X509_check_host 3 ,
.Xr X509_check_issued 3 ,
.Xr X509_check_private_key 3 ,
.Xr X509_CINF_new 3 ,
.Xr X509_cmp 3 ,
.Xr X509_CRL_new 3 ,
.Xr X509_digest 3 ,
.Xr X509_EXTENSION_new 3 ,
.Xr X509_get0_notBefore 3 ,
.Xr X509_get0_signature 3 ,
.Xr X509_get_ex_new_index 3 ,
.Xr X509_get_pubkey 3 ,
.Xr X509_get_serialNumber 3 ,
.Xr X509_get_subject_name 3 ,
.Xr X509_get_version 3 ,
.Xr X509_INFO_new 3 ,
.Xr X509_NAME_new 3 ,
.Xr X509_PUBKEY_new 3 ,
.Xr X509_REQ_new 3 ,
.Xr X509_SIG_new 3 ,
.Xr X509_sign 3 ,
.Xr X509_STORE_CTX_new 3 ,
.Xr X509_STORE_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.