1=pod 2 3=head1 NAME 4 5CMS_final, CMS_final_digest - finalise a CMS_ContentInfo structure 6 7=head1 SYNOPSIS 8 9 #include <openssl/cms.h> 10 11 int CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags); 12 int CMS_final_digest(CMS_ContentInfo *cms, const unsigned char *md, 13 unsigned int mdlen, BIO *dcont, unsigned int flags); 14 15=head1 DESCRIPTION 16 17CMS_final() finalises the structure B<cms>. Its purpose is to perform any 18operations necessary on B<cms> (digest computation for example) and set the 19appropriate fields. The parameter B<data> contains the content to be 20processed. The B<dcont> parameter contains a BIO to write content to after 21processing: this is only used with detached data and will usually be set to 22NULL. 23 24CMS_final_digest() finalises the structure B<cms> using a pre-computed digest, 25rather than computing the digest from the original data. 26 27=head1 NOTES 28 29These functions will normally be called when the B<CMS_PARTIAL> flag is used. It 30should only be used when streaming is not performed because the streaming 31I/O functions perform finalisation operations internally. 32 33To sign a pre-computed digest, L<CMS_sign(3)> or CMS_sign_ex() is called 34with the B<data> parameter set to NULL before the CMS structure is finalised 35with the digest provided to CMS_final_digest() in binary form. 36When signing a pre-computed digest, the security relies on the digest and its 37computation from the original message being trusted. 38 39=head1 RETURN VALUES 40 41CMS_final() and CMS_final_digest() return 1 for success or 0 for failure. 42 43=head1 SEE ALSO 44 45L<ERR_get_error(3)>, L<CMS_sign(3)>, 46L<CMS_encrypt(3)> 47 48=head1 HISTORY 49 50CMS_final_digest() was added in OpenSSL 3.1. 51 52=head1 COPYRIGHT 53 54Copyright 2008-2022 The OpenSSL Project Authors. All Rights Reserved. 55 56Licensed under the Apache License 2.0 (the "License"). You may not use 57this file except in compliance with the License. You can obtain a copy 58in the file LICENSE in the source distribution or at 59L<https://www.openssl.org/source/license.html>. 60 61=cut 62
