SMIME_WRITE_CMS - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL

NAMESMIME_write_CMS − convert CMS structure to S/MIME format

SYNOPSIS​ #include <openssl/cms.h> ​ ​ int SMIME_write_CMS(BIO *out, CMS_ContentInfo *cms, BIO *data, int flags);

DESCRIPTIONSMIME_write_CMS() adds the appropriate MIME headers to a CMS structure to produce an S/MIME message. out is the BIO to write the data to. cms is the appropriate ​CMS_ContentInfo structure. If streaming is enabled then the content must be supplied in the data argument. flags is an optional set of flags.

NOTESThe following flags can be passed in the flags parameter. If CMS_DETACHED is set then cleartext signing will be used, this option only makes sense for SignedData where CMS_DETACHED is also set when CMS_sign() is called. If the CMS_TEXT flag is set MIME headers for type text/plain are added to the content, this only makes sense if CMS_DETACHED is also set. If the CMS_STREAM flag is set streaming is performed. This flag should only be set if CMS_STREAM was also set in the previous call to a CMS_ContentInfo creation function. If cleartext signing is being used and CMS_STREAM not set then the data must be read twice: once to compute the signature in CMS_sign() and once to output the S/MIME message. If streaming is performed the content is output in BER format using indefinite length constructed encoding except in the case of signed data with detached content where the content is absent and DER format is used.

BUGSSMIME_write_CMS() always base64 encodes CMS structures, there should be an option to disable this.

RETURN VALUESSMIME_write_CMS() returns 1 for success or 0 for failure.

SEE ALSOERR_get_error(3), CMS_sign(3), ​CMS_verify(3), CMS_encrypt(3)CMS_decrypt(3)

COPYRIGHTCopyright 2008−2016 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the License). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.
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