CMS_EnvelopedData_create_ex, CMS_EnvelopedData_create, CMS_AuthEnvelopedData_create,

       Copyright 2020-2025 The OpenSSL Project Authors. All Rights Reserved.

       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_ENVELOPEDDATA_CREATE(3SSL)

CMS_EnvelopedData_create_ex() creates a CMS_ContentInfo structure with a type NID_pkcs7_enveloped. cipher
       is the symmetric cipher to use.  The library context libctx and the property query propq are used when
       retrieving algorithms from providers.

       CMS_AuthEnvelopedData_create_ex() creates a CMS_ContentInfo structure with a type
       NID_id_smime_ct_authEnvelopedData. cipher is the symmetric AEAD cipher to use. Currently only AES
       variants with GCM mode are supported. The library context libctx and the property query propq are used
       when retrieving algorithms from providers.

       The algorithm passed in the cipher parameter must support ASN1 encoding of its parameters.

       The recipients can be added later using CMS_add1_recipient_cert(3) or CMS_add0_recipient_key(3).

       The CMS_ContentInfo structure needs to be finalized using CMS_final(3) and then freed using
       CMS_ContentInfo_free(3).

       CMS_EnvelopedData_create() and CMS_AuthEnvelopedData_create() are similar to
       CMS_EnvelopedData_create_ex() and CMS_AuthEnvelopedData_create_ex() but use default values of NULL for
       the library context libctx and the property query propq.

       The CMS_EnvelopedData_create_ex() method was added in OpenSSL 3.0.

       CMS_AuthEnvelopedData_create() and CMS_AuthEnvelopedData_create_ex() were added in OpenSSL 3.5.

       CMS_EnvelopedData_create_ex, CMS_EnvelopedData_create, CMS_AuthEnvelopedData_create,
       CMS_AuthEnvelopedData_create_ex - Create CMS envelope

       Although CMS_EnvelopedData_create_ex(), and CMS_EnvelopedData_create(),
       CMS_AuthEnvelopedData_create_ex(), and CMS_AuthEnvelopedData_create() allocate a new CMS_ContentInfo
       structure, they are not usually used in applications.  The wrappers CMS_encrypt(3) and CMS_decrypt(3) are
       often used instead.

       If the allocation fails, CMS_EnvelopedData_create_ex(), CMS_EnvelopedData_create(),
       CMS_AuthEnvelopedData_create_ex(), CMS_AuthEnvelopedData_create(), CMS_AuthEnvelopedData_create(), and
       CMS_AuthEnvelopedData_create_ex() return NULL and set an error code that can be obtained by
       ERR_get_error(3).  Otherwise, they return a pointer to the newly allocated structure.

ERR_get_error(3), CMS_encrypt(3), CMS_decrypt(3), CMS_final(3), CMS_sign_ex(3), CMS_encrypt_ex(3)

        #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);