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.\" $OpenBSD: X509_find_by_subject.3,v 1.1 2021/07/04 12:56:27 schwarze Exp $
.\"
.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: July 4 2021 $
.Dt X509_FIND_BY_SUBJECT 3
.Os
.Sh NAME
.Nm X509_find_by_subject ,
.Nm X509_find_by_issuer_and_serial
.Nd search an array of X.509 certificates
.Sh SYNOPSIS
.In openssl/x509.h
.Ft X509 *
.Fo X509_find_by_subject
.Fa "STACK_OF(X509) *sk"
.Fa "X509_NAME *subject"
.Fc
.Ft X509 *
.Fo X509_find_by_issuer_and_serial
.Fa "STACK_OF(X509) *sk"
.Fa "X509_NAME *issuer"
.Fa "ASN1_INTEGER *serial"
.Fc
.Sh DESCRIPTION
.Fn X509_find_by_subject
searches the variable-sized array
.Fa sk
for a certificate with a matching
.Fa subject
name.
.Pp
.Fn X509_find_by_issuer_and_serial
searches the array for a certificate where both the
.Fa issuer
name and the
.Fa serial
number match the arguments.
.Sh RETURN VALUES
These functions return a pointer to the first matching certificate or
.Dv NULL
if
.Fa sk
is
.Dv NULL
or does not contain a matching certificate.
.Sh SEE ALSO
.Xr ASN1_INTEGER_new 3 ,
.Xr STACK_OF 3 ,
.Xr X509_cmp 3 ,
.Xr X509_get_serialNumber 3 ,
.Xr X509_get_subject_name 3 ,
.Xr X509_NAME_new 3 ,
.Xr X509_new 3
.Sh HISTORY
These functions first appeared in SSLeay 0.8.1 and have been available since
.Ox 2.4 .
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