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1.\" $OpenBSD: X509_check_issued.3,v 1.4 2019/06/06 01:06:59 schwarze Exp $
2.\" OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
3.\"
4.\" This file was written by Victor B. Wagner <vitus@cryptocom.ru>.
5.\" Copyright (c) 2015 The OpenSSL Project. All rights reserved.
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51.Dd $Mdocdate: June 6 2019 $
52.Dt X509_CHECK_ISSUED 3
53.Os
54.Sh NAME
55.Nm X509_check_issued
56.Nd check whether a certificate was issued using a given CA certificate
57.Sh SYNOPSIS
58.In openssl/x509v3.h
59.Ft int
60.Fo X509_check_issued
61.Fa "X509 *issuer"
62.Fa "X509 *subject"
63.Fc
64.Sh DESCRIPTION
65This function checks whether the certificate
66.Fa subject
67was issued using the CA certificate
68.Fa issuer .
69It does the following checks:
70.Bl -bullet
71.It
72match the issuer field of
73.Fa subject
74against the subject field of
75.Fa issuer
76.It
77if
78.Sy authorityKeyIdentifier
79is present in the
80.Fa subject
81certificate,
82compare it to the
83.Sy subjectKeyIdentifier
84of
85.Fa issuer
86.It
87check the
88.Sy keyUsage
89field of
90.Fa issuer .
91.El
92.Sh RETURN VALUES
93This function returns
94.Dv X509_V_OK
95if the certificate
96.Fa subject
97is issued by
98.Fa issuer ,
99or some
100.Dv X509_V_ERR*
101constant to indicate an error.
102.Sh SEE ALSO
103.Xr X509_check_ca 3 ,
104.Xr X509_new 3 ,
105.Xr X509_verify_cert 3
106.Sh HISTORY
107.Fn X509_check_issued
108first appeared in OpenSSL 0.9.6 and has been available since
109.Ox 2.9 .