CMS_final, CMS_final_digest - finalise a CMS_ContentInfo structure

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       Licensed under the Apache License 2.0 (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
       <https://www.openssl.org/source/license.html>.

3.5.0                                              2025-06-04                                    CMS_FINAL(3SSL)

CMS_final() finalises the structure cms. Its purpose is to perform any operations necessary on cms
       (digest computation for example) and set the appropriate fields. The parameter data contains the content
       to be processed. The dcont parameter contains a BIO to write content to after processing: this is only
       used with detached data and will usually be set to NULL.

       CMS_final_digest() finalises the structure cms using a pre-computed digest, rather than computing the
       digest from the original data.

CMS_final_digest() was added in OpenSSL 3.2.

       CMS_final, CMS_final_digest - finalise a CMS_ContentInfo structure

       These functions will normally be called when the CMS_PARTIAL flag is used. It should only be used when
       streaming is not performed because the streaming I/O functions perform finalisation operations
       internally.

       To sign a pre-computed digest, CMS_sign(3) or CMS_sign_ex() is called with the data parameter set to NULL
       before the CMS structure is finalised with the digest provided to CMS_final_digest() in binary form.
       When signing a pre-computed digest, the security relies on the digest and its computation from the
       original message being trusted.

CMS_final() and CMS_final_digest() return 1 for success or 0 for failure.

ERR_get_error(3), CMS_sign(3), CMS_encrypt(3)

        #include <openssl/cms.h>

        int CMS_final(CMS_ContentInfo *cms, BIO *data, BIO *dcont, unsigned int flags);
        int CMS_final_digest(CMS_ContentInfo *cms, const unsigned char *md,
                             unsigned int mdlen, BIO *dcont, unsigned int flags);