Additional CMS documentation.

=head1 NAME

 CMS_get0_type, CMS_set1_eContentType, CMS_get0_eContentType - get and set CMS content types

 CMS_get0_type, CMS_set1_eContentType, CMS_get0_eContentType, CMS_get0_content - get and set CMS content types and content

=head1 SYNOPSIS

 const ASN1_OBJECT *CMS_get0_type(CMS_ContentInfo *cms);

 int CMS_set1_eContentType(CMS_ContentInfo *cms, const ASN1_OBJECT *oid);

 const ASN1_OBJECT *CMS_get0_eContentType(CMS_ContentInfo *cms);

 ASN1_OCTET_STRING **CMS_get0_content(CMS_ContentInfo *cms);

=head1 DESCRIPTION

ASN1_OBJECT *CMS_get0_eContentType() returns a pointer to the embedded

content type.

CMS_get0_content() returns a pointer to the B<ASN1_OCTET_STRING> pointer

containing the embedded content.

=head1 NOTES

As the B<0> implies CMS_get0_type() and CMS_get0_eContentType() return internal

pointers which should B<not> be freed up. CMS_set1_eContentType() copies the

supplied OID and it B<should> be freed up after use.

As the B<0> implies CMS_get0_type(), CMS_get0_eContentType() and

CMS_get0_content() return internal pointers which should B<not> be freed up.

CMS_set1_eContentType() copies the supplied OID and it B<should> be freed up

after use.

The B<ASN1_OBJECT> values returned can be converted to an integer B<NID> value

using OBJ_obj2nid(). For the currently supported content types the following

 NID_pkcs7_encrypted

 NID_pkcs7_enveloped

The return value of CMS_get0_content() is a pointer to the B<ASN1_OCTET_STRING>

content pointer. That means that for example:

 ASN1_OCTET_STRING **pconf = CMS_get0_content(cms);

B<*pconf> could be NULL if there is no embedded content. Applications can

access, modify or create the embedded content in a B<CMS_ContentInfo> structure

using this function. Applications usually will not need to modify the

embedded content as it is normally set by higher level functions.

=head1 RETURN VALUES

=pod

=head1 NAME

d2i_CMS_ContentInfo, i2d_CMS_ContentInfo - CMS ContentInfo functions

=head1 SYNOPSIS

 #include <openssl/cms.h>

 CMS_ContentInfo *d2i_CMS_ContentInfo(CMS_ContentInfo **a, unsigned char **pp, long length);

 int i2d_CMS_ContentInfo(CMS_ContentInfo *a, unsigned char **pp);

=head1 DESCRIPTION

These functions decode and encode an CMS ContentInfo structure.

Otherwise they behave in a similar way to d2i_X509() and i2d_X509()

described in the L<d2i_X509(3)|d2i_X509(3)> manual page.

=head1 SEE ALSO

L<d2i_X509(3)|d2i_X509(3)>

=head1 HISTORY

These functions were first added to OpenSSL 0.9.8

=cut