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=pod
=head1 NAME
SMIME_write_PKCS7 - convert PKCS#7 structure to S/MIME format.
=head1 SYNOPSIS
int SMIME_write_PKCS7(BIO *out, PKCS7 *p7, BIO *data, int flags);
=head1 DESCRIPTION
SMIME_write_PKCS7() adds the appropriate MIME headers to a PKCS#7
structure to produce an S/MIME message.
B<out> is the BIO to write the data to. B<p7> is the appropriate
B<PKCS7> structure. If cleartext signing (B<multipart/signed>) is
being used then the signed data must be supplied in the B<data>
argument. B<flags> is an optional set of flags.
=head1 NOTES
The following flags can be passed in the B<flags> parameter.
If B<PKCS7_DETACHED> is set then cleartext signing will be used,
this option only makes sense for signedData where B<PKCS7_DETACHED>
is also set when PKCS7_sign() is also called.
If the B<PKCS7_TEXT> flag is set MIME headers for type B<text/plain>
are added to the content, this only makes sense if B<PKCS7_DETACHED>
is also set.
If cleartext signing is being used then the data must be read twice:
once to compute the signature in PKCS7_sign() and once to output the
S/MIME message.
=head1 BUGS
SMIME_write_PKCS7() always base64 encodes PKCS#7 structures, there
should be an option to disable this.
There should really be a way to produce cleartext signing using only
a single pass of the data.
=head1 RETURN VALUES
SMIME_write_PKCS7() returns 1 for success or 0 for failure.
=head1 SEE ALSO
L<ERR_get_error(3)|ERR_get_error(3)>, L<PKCS7_sign(3)|PKCS7_sign(3)>,
L<PKCS7_verify(3)|PKCS7_verify(3)>, L<PKCS7_encrypt(3)|PKCS7_encrypt(3)>
L<PKCS7_decrypt(3)|PKCS7_decrypt(3)>
=head1 HISTORY
SMIME_write_PKCS7() was added to OpenSSL 0.9.5
=cut
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