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.\" ========================================================================
.\"
.IX Title "CMS_ENVELOPEDDATA_CREATE 3SSL"
.TH CMS_ENVELOPEDDATA_CREATE 3SSL "2023-10-23" "3.0.11" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
CMS_EnvelopedData_create_ex, CMS_EnvelopedData_create,
CMS_AuthEnvelopedData_create, CMS_AuthEnvelopedData_create_ex
\&\- Create CMS envelope
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/cms.h>
\&
\& CMS_ContentInfo *
\& CMS_EnvelopedData_create_ex(const EVP_CIPHER *cipher, OSSL_LIB_CTX *libctx,
\&                             const char *propq);
\& CMS_ContentInfo *CMS_EnvelopedData_create(const EVP_CIPHER *cipher);
\&
\& CMS_ContentInfo *
\& CMS_AuthEnvelopedData_create_ex(const EVP_CIPHER *cipher, OSSL_LIB_CTX *libctx,
\&                                 const char *propq);
\& CMS_ContentInfo *CMS_AuthEnvelopedData_create(const EVP_CIPHER *cipher);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBCMS_EnvelopedData_create_ex()\fR creates a \fBCMS_ContentInfo\fR structure
with a type \fBNID_pkcs7_enveloped\fR. \fIcipher\fR is the symmetric cipher to use.
The library context \fIlibctx\fR and the property query \fIpropq\fR are used when
retrieving algorithms from providers.
.PP
\&\fBCMS_AuthEnvelopedData_create_ex()\fR creates a \fBCMS_ContentInfo\fR
structure with a type \fBNID_id_smime_ct_authEnvelopedData\fR. \fBcipher\fR is the
symmetric \s-1AEAD\s0 cipher to use. Currently only \s-1AES\s0 variants with \s-1GCM\s0 mode are
supported. The library context \fIlibctx\fR and the property query \fIpropq\fR are
used when retrieving algorithms from providers.
.PP
The algorithm passed in the \fIcipher\fR parameter must support \s-1ASN1\s0 encoding of
its parameters.
.PP
The recipients can be added later using \fBCMS_add1_recipient_cert\fR\|(3) or
\&\fBCMS_add0_recipient_key\fR\|(3).
.PP
The \fBCMS_ContentInfo\fR structure needs to be finalized using \fBCMS_final\fR\|(3)
and then freed using \fBCMS_ContentInfo_free\fR\|(3).
.PP
\&\fBCMS_EnvelopedData_create()\fR and  CMS_AuthEnvelopedData_create are similar to
\&\fBCMS_EnvelopedData_create_ex()\fR and
\&\fBCMS_AuthEnvelopedData_create_ex()\fR but use default values of \s-1NULL\s0 for
the library context \fIlibctx\fR and the property query \fIpropq\fR.
.SH "NOTES"
.IX Header "NOTES"
Although \fBCMS_EnvelopedData_create()\fR and \fBCMS_AuthEnvelopedData_create()\fR allocate
a new \fBCMS_ContentInfo\fR structure, they are not usually used in applications.
The wrappers \fBCMS_encrypt\fR\|(3) and \fBCMS_decrypt\fR\|(3) are often used instead.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
If the allocation fails, \fBCMS_EnvelopedData_create()\fR and
\&\fBCMS_AuthEnvelopedData_create()\fR return \s-1NULL\s0 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_encrypt\fR\|(3), \fBCMS_decrypt\fR\|(3), \fBCMS_final\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The \fBCMS_EnvelopedData_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 \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.