.\" $OpenBSD: PKCS7_get_signer_info.3,v 1.1 2020/06/10 11:43:08 schwarze Exp $
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.\" Copyright (c) 2020 Ingo Schwarze <schwarze@openbsd.org>
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.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 .