CentOS 7.0 - man page for smime_write_cms (centos section 3)
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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
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.
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 is used.
SMIME_write_CMS() always base64 encodes CMS structures, there should be an option to
SMIME_write_CMS() returns 1 for success or 0 for failure.
ERR_get_error(3), CMS_sign(3), CMS_verify(3), CMS_encrypt(3) CMS_decrypt(3)
SMIME_write_CMS() was added to OpenSSL 0.9.8
1.0.1e 2013-02-11 SMIME_write_CMS(3)
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