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.\" ========================================================================
.\"
.IX Title "CMS_DIGEST_CREATE 3ssl"
.TH CMS_DIGEST_CREATE 3ssl 2024-04-28 3.3.0 OpenSSL
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH NAME
CMS_digest_create_ex, CMS_digest_create
\&\- Create CMS DigestedData object
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/cms.h>
\&
\& CMS_ContentInfo *CMS_digest_create_ex(BIO *in, const EVP_MD *md,
\&                                       unsigned int flags, OSSL_LIB_CTX *ctx,
\&                                       const char *propq);
\&
\& CMS_ContentInfo *CMS_digest_create(BIO *in, const EVP_MD *md,
\&                                    unsigned int flags);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBCMS_digest_create_ex()\fR creates a \fBCMS_ContentInfo\fR structure
with a type \fBNID_pkcs7_digest\fR. The data supplied via the \fIin\fR BIO is digested
using \fImd\fR. The library context \fIlibctx\fR and the property query \fIpropq\fR are
used when retrieving algorithms from providers.
The \fIflags\fR field supports the \fBCMS_DETACHED\fR and \fBCMS_STREAM\fR flags,
Internally \fBCMS_final()\fR is called unless \fBCMS_STREAM\fR is specified.
.PP
The \fBCMS_ContentInfo\fR structure can be freed using \fBCMS_ContentInfo_free\fR\|(3).
.PP
\&\fBCMS_digest_create()\fR is similar to \fBCMS_digest_create_ex()\fR
but uses default values of NULL for the library context \fIlibctx\fR and the
property query \fIpropq\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
If the allocation fails, \fBCMS_digest_create_ex()\fR and \fBCMS_digest_create()\fR
return NULL and set an error code that can be obtained by \fBERR_get_error\fR\|(3).
Otherwise they return a pointer to the newly allocated structure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBERR_get_error\fR\|(3), \fBCMS_final\fR\|(3)>
.SH HISTORY
.IX Header "HISTORY"
The \fBCMS_digest_create_ex()\fR method was added in OpenSSL 3.0.
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2020\-2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
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>.