=head1 NAME
-SMIME_write_PKCS7 - convert PKCS#7 structure to S/MIME format.
+SMIME_write_PKCS7 - convert PKCS#7 structure to S/MIME format
=head1 SYNOPSIS
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.
+B<out> is the BIO to write the data to. B<p7> is the appropriate B<PKCS7>
+structure. If streaming is enabled then the content must be supplied in the
+B<data> argument. B<flags> is an optional set of flags.
=head1 NOTES
are added to the content, this only makes sense if B<PKCS7_DETACHED>
is also set.
-If the B<PKCS7_PARTSIGN> flag is set the signed data is finalized
-and output along with the content. This flag should only be set
-if B<PKCS7_DETACHED> is also set and the previous call to PKCS7_sign()
-also set these flags.
+If the B<PKCS7_STREAM> flag is set streaming is performed. This flag should
+only be set if B<PKCS7_STREAM> was also set in the previous call to
+PKCS7_sign() or PKCS7_encrypt().
-If cleartext signing is being used and B<PKCS7_PARTSIGN> not set then
+If cleartext signing is being used and B<PKCS7_STREAM> not set then
the data must be read twice: once to compute the signature in PKCS7_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.
+
=head1 BUGS
SMIME_write_PKCS7() always base64 encodes PKCS#7 structures, there
=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)>
+L<ERR_get_error(3)>, L<PKCS7_sign(3)>,
+L<PKCS7_verify(3)>, L<PKCS7_encrypt(3)>
+L<PKCS7_decrypt(3)>
+
+=head1 COPYRIGHT
-=head1 HISTORY
+Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
-SMIME_write_PKCS7() was added to OpenSSL 0.9.5
+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
+L<https://www.openssl.org/source/license.html>.
=cut