xref: /openssl/doc/man3/SMIME_write_CMS.pod (revision 4746f25a)
1=pod
2
3=head1 NAME
4
5SMIME_write_CMS - convert CMS structure to S/MIME format
6
7=head1 SYNOPSIS
8
9 #include <openssl/cms.h>
10
11 int SMIME_write_CMS(BIO *out, CMS_ContentInfo *cms, BIO *data, int flags);
12
13=head1 DESCRIPTION
14
15SMIME_write_CMS() adds the appropriate MIME headers to a CMS
16structure to produce an S/MIME message.
17
18B<out> is the BIO to write the data to. B<cms> is the appropriate
19B<CMS_ContentInfo> structure. If streaming is enabled then the content must be
20supplied in the B<data> argument. B<flags> is an optional set of flags.
21
22=head1 NOTES
23
24The following flags can be passed in the B<flags> parameter.
25
26If B<CMS_DETACHED> is set then cleartext signing will be used, this option only
27makes sense for SignedData where B<CMS_DETACHED> is also set when CMS_sign() is
28called.
29
30If the B<CMS_TEXT> flag is set MIME headers for type B<text/plain> are added to
31the content, this only makes sense if B<CMS_DETACHED> is also set.
32
33If the B<CMS_STREAM> flag is set streaming is performed. This flag should only
34be set if B<CMS_STREAM> was also set in the previous call to a CMS_ContentInfo
35creation function.
36
37If cleartext signing is being used and B<CMS_STREAM> not set then the data must
38be read twice: once to compute the signature in CMS_sign() and once to output
39the S/MIME message.
40
41If streaming is performed the content is output in BER format using indefinite
42length constructed encoding except in the case of signed data with detached
43content where the content is absent and DER format is used.
44
45=head1 BUGS
46
47SMIME_write_CMS() always base64 encodes CMS structures, there should be an
48option to disable this.
49
50=head1 RETURN VALUES
51
52SMIME_write_CMS() returns 1 for success or 0 for failure.
53
54=head1 SEE ALSO
55
56L<ERR_get_error(3)>, L<CMS_sign(3)>,
57L<CMS_verify(3)>, L<CMS_encrypt(3)>
58L<CMS_decrypt(3)>
59
60=head1 COPYRIGHT
61
62Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
63
64Licensed under the Apache License 2.0 (the "License").  You may not use
65this file except in compliance with the License.  You can obtain a copy
66in the file LICENSE in the source distribution or at
67L<https://www.openssl.org/source/license.html>.
68
69=cut
70