NAME¶
SMIME_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);
DESCRIPTION¶
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 flags.
NOTES¶
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.
BUGS¶
SMIME_write_CMS() always base64 encodes CMS structures, there should be
an option to disable this.
RETURN VALUES¶
SMIME_write_CMS() returns 1 for success or 0 for failure.
SEE ALSO¶
ERR_get_error(3),
CMS_sign(3),
CMS_verify(3),
CMS_encrypt(3) CMS_decrypt(3)
HISTORY¶
SMIME_write_CMS() was added to OpenSSL 0.9.8