70 lines
2.1 KiB
Plaintext
70 lines
2.1 KiB
Plaintext
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=pod
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=head1 NAME
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SMIME_write_CMS - convert CMS structure to S/MIME format
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=head1 SYNOPSIS
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#include <openssl/cms.h>
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int SMIME_write_CMS(BIO *out, CMS_ContentInfo *cms, BIO *data, int flags);
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=head1 DESCRIPTION
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SMIME_write_CMS() adds the appropriate MIME headers to a CMS
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structure to produce an S/MIME message.
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B<out> is the BIO to write the data to. B<cms> is the appropriate
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B<CMS_ContentInfo> structure. If streaming is enabled then the content must be
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supplied in the B<data> argument. B<flags> is an optional set of flags.
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=head1 NOTES
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The following flags can be passed in the B<flags> parameter.
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If B<CMS_DETACHED> is set then cleartext signing will be used, this option only
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makes sense for SignedData where B<CMS_DETACHED> is also set when CMS_sign() is
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called.
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If the B<CMS_TEXT> flag is set MIME headers for type B<text/plain> are added to
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the content, this only makes sense if B<CMS_DETACHED> is also set.
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If the B<CMS_STREAM> flag is set streaming is performed. This flag should only
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be set if B<CMS_STREAM> was also set in the previous call to a CMS_ContentInfo
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creation function.
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If cleartext signing is being used and B<CMS_STREAM> not set then the data must
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be read twice: once to compute the signature in CMS_sign() and once to output
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the S/MIME message.
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If streaming is performed the content is output in BER format using indefinite
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length constructed encoding except in the case of signed data with detached
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content where the content is absent and DER format is used.
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=head1 BUGS
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SMIME_write_CMS() always base64 encodes CMS structures, there should be an
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option to disable this.
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=head1 RETURN VALUES
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SMIME_write_CMS() returns 1 for success or 0 for failure.
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=head1 SEE ALSO
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L<ERR_get_error(3)>, L<CMS_sign(3)>,
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L<CMS_verify(3)>, L<CMS_encrypt(3)>
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L<CMS_decrypt(3)>
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=head1 COPYRIGHT
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Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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