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=head1 NAME

CMS_EnvelopedData_create - Create CMS envelope

=head1 SYNOPSIS

 #include <openssl/cms.h>

 CMS_ContentInfo *CMS_EnvelopedData_create(const EVP_CIPHER *cipher);

=head1 DESCRIPTION

CMS_EnvelopedData_create() creates a B<CMS_ContentInfo> structure with
a type B<NID_pkcs7_enveloped>. B<cipher> is the symmetric cipher to use.

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

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

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

=head1 NOTES

Although CMS_EnvelopedData_create() allocates a new B<CMS_ContentInfo>
structure it is usually not used in applications. The wrappers
L<CMS_encrypt(3)> and L<CMS_decrypt(3)> are often used instead.

=head1 RETURN VALUES

If the allocation fails, CMS_EnvelopedData_create() returns NULL and sets
an error code that can be obtained by L<ERR_get_error(3)>.
Otherwise it returns a pointer to the newly allocated structure.

=head1 SEE ALSO

L<ERR_get_error(3)>, L<CMS_encrypt(3)>, L<CMS_decrypt(3)>, L<CMS_final(3)>

=head1 COPYRIGHT

Copyright 2020 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
L<https://www.openssl.org/source/license.html>.

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