.\" $OpenBSD: X509_find_by_subject.3,v 1.1 2021/07/04 12:56:27 schwarze Exp $
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.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
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.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 .