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62 lines
2.0 KiB
Plaintext
62 lines
2.0 KiB
Plaintext
=pod
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=head1 NAME
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CMS_final, CMS_final_digest - finalise a CMS_ContentInfo structure
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=head1 SYNOPSIS
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#include <openssl/cms.h>
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int CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags);
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int CMS_final_digest(CMS_ContentInfo *cms, const unsigned char *md,
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unsigned int mdlen, BIO *dcont, unsigned int flags);
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=head1 DESCRIPTION
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CMS_final() finalises the structure B<cms>. Its purpose is to perform any
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operations necessary on B<cms> (digest computation for example) and set the
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appropriate fields. The parameter B<data> contains the content to be
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processed. The B<dcont> parameter contains a BIO to write content to after
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processing: this is only used with detached data and will usually be set to
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NULL.
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CMS_final_digest() finalises the structure B<cms> using a pre-computed digest,
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rather than computing the digest from the original data.
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=head1 NOTES
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These functions will normally be called when the B<CMS_PARTIAL> flag is used. It
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should only be used when streaming is not performed because the streaming
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I/O functions perform finalisation operations internally.
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To sign a pre-computed digest, L<CMS_sign(3)> or CMS_sign_ex() is called
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with the B<data> parameter set to NULL before the CMS structure is finalised
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with the digest provided to CMS_final_digest() in binary form.
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When signing a pre-computed digest, the security relies on the digest and its
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computation from the original message being trusted.
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=head1 RETURN VALUES
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CMS_final() and CMS_final_digest() return 1 for success or 0 for failure.
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=head1 SEE ALSO
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L<ERR_get_error(3)>, L<CMS_sign(3)>,
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L<CMS_encrypt(3)>
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=head1 HISTORY
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CMS_final_digest() was added in OpenSSL 3.1.
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=head1 COPYRIGHT
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Copyright 2008-2022 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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