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SMIME_write_CMS(3) OpenSSL SMIME_write_CMS(3)
SMIME_write_CMS - convert CMS structure to S/MIME format.
int SMIME_write_CMS(BIO *out, CMS_ContentInfo *cms, BIO *data, int flags);
SMIME_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
The 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
SMIME_write_CMS() always base64 encodes CMS structures, there should be
an option to disable this.
SMIME_write_CMS() returns 1 for success or 0 for failure.
ERR_get_error(3), CMS_sign(3), CMS_verify(3), CMS_encrypt(3)
SMIME_write_CMS() was added to OpenSSL 0.9.8
1.0.2h 2016-05-03 SMIME_write_CMS(3)