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.IX Title &quot;SMIME_READ_CMS 3&quot;
.TH SMIME_READ_CMS 3 &quot;2023-09-11&quot; &quot;1.1.1w&quot; &quot;OpenSSL&quot;
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.SH &quot;NAME&quot;
SMIME_read_CMS \- parse S/MIME message
.SH &quot;SYNOPSIS&quot;
.IX Header &quot;SYNOPSIS&quot;
.Vb 1
\&amp; #include &lt;openssl/cms.h&gt;
\&amp;
\&amp; CMS_ContentInfo *SMIME_read_CMS(BIO *in, BIO **bcont);
.Ve
.SH &quot;DESCRIPTION&quot;
.IX Header &quot;DESCRIPTION&quot;
\&amp;\fBSMIME_read_CMS()\fR parses a message in S/MIME format.
.PP
\&amp;\fBin\fR is a \s-1BIO\s0 to read the message from.
.PP
If cleartext signing is used then the content is saved in a memory bio which is
written to \fB*bcont\fR, otherwise \fB*bcont\fR is set to \s-1NULL.\s0
.PP
The parsed CMS_ContentInfo structure is returned or \s-1NULL\s0 if an
error occurred.
.SH &quot;NOTES&quot;
.IX Header &quot;NOTES&quot;
If \fB*bcont\fR is not \s-1NULL\s0 then the message is clear text signed. \fB*bcont\fR can
then be passed to \fBCMS_verify()\fR with the \fB\s-1CMS_DETACHED\s0\fR flag set.
.PP
Otherwise the type of the returned structure can be determined
using \fBCMS_get0_type()\fR.
.PP
To support future functionality if \fBbcont\fR is not \s-1NULL\s0 \fB*bcont\fR should be
initialized to \s-1NULL.\s0 For example:
.PP
.Vb 2
\&amp; BIO *cont = NULL;
\&amp; CMS_ContentInfo *cms;
\&amp;
\&amp; cms = SMIME_read_CMS(in, &amp;cont);
.Ve
.SH &quot;BUGS&quot;
.IX Header &quot;BUGS&quot;
The \s-1MIME\s0 parser used by \fBSMIME_read_CMS()\fR is somewhat primitive.  While it will
handle most S/MIME messages more complex compound formats may not work.
.PP
The parser assumes that the 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 \s-1BIO\s0 to hold the signed content limits the size of message
which can be processed due to memory restraints: a streaming single pass option
should be available.
.SH &quot;RETURN VALUES&quot;
.IX Header &quot;RETURN VALUES&quot;
\&amp;\fBSMIME_read_CMS()\fR returns a valid \fBCMS_ContentInfo\fR structure or \fB\s-1NULL\s0\fR
if an error occurred. The error can be obtained from \fBERR_get_error\fR\|(3).
.SH &quot;SEE ALSO&quot;
.IX Header &quot;SEE ALSO&quot;
\&amp;\fBERR_get_error\fR\|(3), \fBCMS_type\fR\|(3),
\&amp;\fBSMIME_read_CMS\fR\|(3), \fBCMS_sign\fR\|(3),
\&amp;\fBCMS_verify\fR\|(3), \fBCMS_encrypt\fR\|(3),
\&amp;\fBCMS_decrypt\fR\|(3)
.SH &quot;COPYRIGHT&quot;
.IX Header &quot;COPYRIGHT&quot;
Copyright 2008\-2016 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L&quot;License\*(R&quot;).  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
&lt;https://www.openssl.org/source/license.html&gt;.
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