.\" $OpenBSD: CMS_verify_receipt.3,v 1.7 2019/11/02 15:39:46 schwarze Exp $
.\" full merge up to: OpenSSL e9b77246 Jan 20 19:58:49 2017 +0100
.\"
.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
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.Dd $Mdocdate: November 2 2019 $
.Dt CMS_VERIFY_RECEIPT 3
.Os
.Sh NAME
.Nm CMS_verify_receipt
.Nd verify a CMS signed receipt
.Sh SYNOPSIS
.In openssl/cms.h
.Ft int
.Fo CMS_verify_receipt
.Fa "CMS_ContentInfo *rcms"
.Fa "CMS_ContentInfo *ocms"
.Fa "STACK_OF(X509) *certs"
.Fa "X509_STORE *store"
.Fa "unsigned int flags"
.Fc
.Sh DESCRIPTION
.Fn CMS_verify_receipt
verifies a CMS signed receipt.
.Fa rcms
is the signed receipt to verify.
.Fa ocms
is the original
.Vt SignedData
structure containing the receipt request.
.Fa certs
is a set of certificates in which to search for the signing certificate.
.Fa store
is a trusted certificate store (used for chain verification).
.Pp
This functions behaves in a similar way to
.Xr CMS_verify 3
except that the
.Fa flags
values
.Dv CMS_DETACHED ,
.Dv CMS_BINARY ,
.Dv CMS_TEXT ,
and
.Dv CMS_STREAM
are not supported since they do not make sense in the context of signed
receipts.
.Sh RETURN VALUES
.Fn CMS_verify_receipt
returns 1 for a successful verification or 0 if an error occurred.
.Pp
The error can be obtained from
.Xr ERR_get_error 3 .
.Sh SEE ALSO
.Xr CMS_ContentInfo_new 3 ,
.Xr CMS_get1_ReceiptRequest 3 ,
.Xr CMS_sign_receipt 3 ,
.Xr CMS_verify 3
.Sh STANDARDS
RFC 2634: Enhanced Security Services for S/MIME, section 2.8: Receipt Syntax
.Sh HISTORY
.Fn CMS_verify_receipt
first appeared in OpenSSL 0.9.8h
and has been available since
.Ox 6.7 .