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1.\" $OpenBSD: CMS_get0_SignerInfos.3,v 1.9 2024/01/22 14:00:13 tb Exp $
2.\" full merge up to: OpenSSL 83cf7abf May 29 13:07:08 2018 +0100
3.\"
4.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
5.\" Copyright (c) 2008, 2013 The OpenSSL Project. All rights reserved.
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51.Dd $Mdocdate: January 22 2024 $
52.Dt CMS_GET0_SIGNERINFOS 3
53.Os
54.Sh NAME
55.Nm CMS_get0_SignerInfos ,
56.Nm CMS_SignerInfo_get_version ,
57.Nm CMS_SignerInfo_get0_signer_id ,
58.Nm CMS_SignerInfo_get0_signature ,
59.Nm CMS_SignerInfo_cert_cmp ,
60.Nm CMS_SignerInfo_set1_signer_cert
61.Nd CMS SignedData signer functions
62.Sh SYNOPSIS
63.In openssl/cms.h
64.Ft STACK_OF(CMS_SignerInfo) *
65.Fo CMS_get0_SignerInfos
66.Fa "CMS_ContentInfo *cms"
67.Fc
68.Ft int
69.Fo CMS_SignerInfo_get_version
70.Fa "CMS_SignerInfo *si"
71.Fa "long *version"
72.Fc
73.Ft int
74.Fo CMS_SignerInfo_get0_signer_id
75.Fa "CMS_SignerInfo *si"
76.Fa "ASN1_OCTET_STRING **keyid"
77.Fa "X509_NAME **issuer"
78.Fa "ASN1_INTEGER **sno"
79.Fc
80.Ft ASN1_OCTET_STRING *
81.Fo CMS_SignerInfo_get0_signature
82.Fa "CMS_SignerInfo *si"
83.Fc
84.Ft int
85.Fo CMS_SignerInfo_cert_cmp
86.Fa "CMS_SignerInfo *si"
87.Fa "X509 *certificate"
88.Fc
89.Ft void
90.Fo CMS_SignerInfo_set1_signer_cert
91.Fa "CMS_SignerInfo *si"
92.Fa "X509 *signer"
93.Fc
94.Sh DESCRIPTION
95.Fn CMS_get0_SignerInfos
96returns all the
97.Vt SignerInfo
98structures associated with the
99.Vt SignedData
100structure
101.Fa cms .
102.Pp
103.Fn CMS_SignerInfo_get_version
104sets
105.Pf * Fa version
106to the syntax version number of the
107.Vt SignerInfo
108structure
109.Fa si .
110.Pp
111.Fn CMS_SignerInfo_get0_signer_id
112retrieves the certificate
113.Vt SignerIdentifier
114associated with the
115.Vt SignerInfo
116structure
117.Fa si .
118Either the
119.Vt SubjectKeyIdentifier
120will be set in
121.Fa keyid
122or both issuer name and serial number in
123.Fa issuer
124and
125.Fa sno .
126.Pp
127.Fn CMS_SignerInfo_get0_signature
128retrieves the
129.Fa signature
130field of
131.Fa si .
132The application program is allowed to modify the data pointed to.
133.Pp
134.Fn CMS_SignerInfo_cert_cmp
135compares the
136.Fa certificate
137against the signer identifier of
138.Fa si .
139.Pp
140.Fn CMS_SignerInfo_set1_signer_cert
141sets the signer certificate of
142.Fa si
143to
144.Fa signer .
145.Pp
146The main purpose of these functions is to enable an application to
147look up signer certificates using any appropriate technique when the
148simpler method of
149.Xr CMS_verify 3
150is not appropriate.
151.Pp
152In typical usage, an application retrieves all
153.Vt CMS_SignerInfo
154structures using
155.Fn CMS_get0_SignerInfos
156and retrieves the identifier information using CMS.
157It will then obtain the signer certificate by some unspecified means
158(or return and error if it cannot be found) and set it using
159.Fn CMS_SignerInfo_set1_signer_cert .
160Once all signer certificates have been set,
161.Xr CMS_verify 3
162can be used.
163.Sh RETURN VALUES
164.Fn CMS_get0_SignerInfos
165returns an internal pointer to all the
166.Vt CMS_SignerInfo
167structures, or
168.Dv NULL
169if there are no signers or if
170.Fa cms
171is not of the type
172.Vt SignedData .
173.Pp
174.Fn CMS_SignerInfo_get_version
175always succeeds and returns 1.
176.Pp
177.Fn CMS_SignerInfo_get0_signer_id
178returns 1 for success or 0 for failure.
179.Pp
180.Fn CMS_SignerInfo_get0_signature
181returns an internal pointer to the signature.
182.Pp
183.Fn CMS_SignerInfo_cert_cmp
184returns 0 for a match or non-zero otherwise.
185.Pp
186Any error can be obtained from
187.Xr ERR_get_error 3 .
188.Sh SEE ALSO
189.Xr CMS_ContentInfo_new 3 ,
190.Xr CMS_signed_add1_attr 3 ,
191.Xr CMS_verify 3
192.Sh STANDARDS
193RFC 5652: Cryptographic Message Syntax (CMS)
194.Bl -dash -compact -offset indent
195.It
196section 5.1: SignedData Type
197.It
198section 5.3: SignerInfo Type
199.El
200.Sh HISTORY
201.Fn CMS_get0_SignerInfos ,
202.Fn CMS_SignerInfo_get0_signer_id ,
203.Fn CMS_SignerInfo_cert_cmp ,
204and
205.Fn CMS_SignerInfo_set1_signer_cert
206first appeared in OpenSSL 0.9.8h and
207.Fn CMS_SignerInfo_get0_signature
208in OpenSSL 1.0.2.
209These functions have been available since
210.Ox 6.7 .
211.Pp
212.Fn CMS_SignerInfo_get_version
213first appeared in
214.Ox 7.4 .
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