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.\" $OpenBSD: PKCS7_get_signer_info.3,v 1.1 2020/06/10 11:43:08 schwarze Exp $
.\"
.\" Copyright (c) 2020 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: June 10 2020 $
.Dt PKCS7_GET_SIGNER_INFO 3
.Os
.Sh NAME
.Nm PKCS7_get_signer_info
.Nd retrieve signerInfos from a SignedData object
.Sh SYNOPSIS
.In openssl/pkcs7.h
.Ft STACK_OF(PKCS7_SIGNER_INFO) *
.Fn PKCS7_get_signer_info "PKCS7 *p7"
.Sh DESCRIPTION
This function retrieves the set of
.Vt SignerInfo
structures from the
.Fa signerInfos
field of
.Fa p7 .
.Pp
These can subsequently be manipulated with the functions documented in
.Xr PKCS7_add_attribute 3 .
.Sh RETURN VALUES
.Fn PKCS7_get_signer_info
returns an internal pointer to a
.Vt STACK_OF(PKCS7_SIGNER_INFO)
object or
.Dv NULL
on failure.
It fails if
.Fa p7
is
.Dv NULL ,
if it has no content,
or if it is of a type other than
.Vt SignedData
or
.Vt SignedAndEnvelopedData .
.Sh SEE ALSO
.Xr PKCS7_add_attribute 3 ,
.Xr PKCS7_final 3 ,
.Xr PKCS7_new 3 ,
.Xr PKCS7_sign 3 ,
.Xr PKCS7_sign_add_signer 3
.Sh HISTORY
.Fn PKCS7_get_signer_info
first appeared in SSLeay 0.8.1 and has been available since
.Ox 2.4 .
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