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-.\" $OpenBSD: SMIME_read_CMS.3,v 1.7 2021/12/14 14:30:50 schwarze Exp $
-.\" full merge up to: OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
-.\"
-.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
-.\" Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\"
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\"
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in
-.\"    the documentation and/or other materials provided with the
-.\"    distribution.
-.\"
-.\" 3. All advertising materials mentioning features or use of this
-.\"    software must display the following acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
-.\"
-.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
-.\"    endorse or promote products derived from this software without
-.\"    prior written permission. For written permission, please contact
-.\"    openssl-core@openssl.org.
-.\"
-.\" 5. Products derived from this software may not be called "OpenSSL"
-.\"    nor may "OpenSSL" appear in their names without prior written
-.\"    permission of the OpenSSL Project.
-.\"
-.\" 6. Redistributions of any form whatsoever must retain the following
-.\"    acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
-.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
-.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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-.\"
-.Dd $Mdocdate: December 14 2021 $
-.Dt SMIME_READ_CMS 3
-.Os
-.Sh NAME
-.Nm SMIME_read_CMS
-.Nd extract CMS ContentInfo from an S/MIME message
-.Sh SYNOPSIS
-.In openssl/cms.h
-.Ft CMS_ContentInfo *
-.Fo SMIME_read_CMS
-.Fa "BIO *in"
-.Fa "BIO **bcont"
-.Fc
-.Sh DESCRIPTION
-.Fn SMIME_read_CMS
-parses a message in S/MIME format from
-.Fa in .
-.Pp
-If the message uses cleartext signing, the content is saved in a memory BIO
-which is written to
-.Pf * Fa bcont
-and which can then be passed to
-.Xr CMS_verify 3
-with the
-.Dv CMS_DETACHED
-flag set.
-Otherwise,
-.Pf * Fa bcont
-is set to
-.Dv NULL
-and the type of the returned structure can be determined using
-.Xr CMS_get0_type 3 .
-.Pp
-To support future functionality if
-.Fa bcont
-is not
-.Dv NULL ,
-.Pf * Fa bcont
-should be initialized to
-.Dv NULL ,
-for example:
-.Bd -literal -offset indent
-BIO *cont = NULL;
-CMS_ContentInfo *cms = SMIME_read_CMS(in, &cont);
-.Ed
-.Sh RETURN VALUES
-.Fn SMIME_read_CMS
-returns a valid
-.Vt CMS_ContentInfo
-structure or
-.Dv NULL
-if an error occurred.
-The error can be obtained from
-.Xr ERR_get_error 3 .
-.Sh SEE ALSO
-.Xr CMS_ContentInfo_new 3 ,
-.Xr CMS_decrypt 3 ,
-.Xr CMS_get0_type 3 ,
-.Xr CMS_verify 3 ,
-.Xr d2i_CMS_ContentInfo 3 ,
-.Xr SMIME_read_ASN1 3 ,
-.Xr SMIME_write_CMS 3
-.Sh HISTORY
-.Fn SMIME_read_CMS
-first appeared in OpenSSL 0.9.8h
-and has been available since
-.Ox 6.7 .
-.Sh BUGS
-The MIME parser used by
-.Fn SMIME_read_CMS
-is somewhat primitive.
-While it will handle most S/MIME messages, more complex compound formats
-may not work.
-.Pp
-The parser assumes that the
-.Vt CMS_ContentInfo
-structure is always base64 encoded and will not handle the case
-where it is in binary format or uses quoted printable format.
-.Pp
-The use of a memory BIO to hold the signed content limits the size of
-the message which can be processed due to memory restraints: a streaming
-single pass option should be available.