NAME

       CMS_EnvelopedData_create_ex, CMS_EnvelopedData_create, CMS_AuthEnvelopedData_create,
       CMS_AuthEnvelopedData_create_ex - Create CMS envelope

SYNOPSIS

        #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);

DESCRIPTION

       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.

NOTES

       Although CMS_EnvelopedData_create() 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.

RETURN VALUES

       If the allocation fails, CMS_EnvelopedData_create() and CMS_AuthEnvelopedData_create()
       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.

SEE ALSO

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

HISTORY

       The CMS_EnvelopedData_create_ex() method was added in OpenSSL 3.0.

COPYRIGHT

       Copyright 2020-2021 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>.