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=pod
=head1 NAME
CMS_add0_cert, CMS_add1_cert, CMS_get1_certs, CMS_add0_crl, CMS_get1_crls, - CMS certificate and CRL utility functions
=head1 SYNOPSIS
#include <openssl/cms.h>
int CMS_add0_cert(CMS_ContentInfo *cms, X509 *cert);
int CMS_add1_cert(CMS_ContentInfo *cms, X509 *cert);
STACK_OF(X509) *CMS_get1_certs(CMS_ContentInfo *cms);
int CMS_add0_crl(CMS_ContentInfo *cms, X509_CRL *crl);
int CMS_add1_crl(CMS_ContentInfo *cms, X509_CRL *crl);
STACK_OF(X509_CRL) *CMS_get1_crls(CMS_ContentInfo *cms);
=head1 DESCRIPTION
CMS_add0_cert() and CMS_add1_cert() add certificate B<cert> to B<cms>.
must be of type signed data or enveloped data.
CMS_get1_certs() returns all certificates in B<cms>.
CMS_add0_crl() and CMS_add1_crl() add CRL B<crl> to B<cms>. CMS_get1_crls()
returns any CRLs in B<cms>.
=head1 NOTES
The CMS_ContentInfo structure B<cms> must be of type signed data or enveloped
data or an error will be returned.
For signed data certificates and CRLs are added to the B<certificates> and
B<crls> fields of SignedData structure. For enveloped data they are added to
B<OriginatorInfo>.
As the B<0> implies CMS_add0_cert() adds B<cert> internally to B<cms> and it
must not be freed up after the call as opposed to CMS_add1_cert() where B<cert>
must be freed up.
The same certificate or CRL must not be added to the same cms structure more
than once.
=head1 RETURN VALUES
CMS_add0_cert(), CMS_add1_cert() and CMS_add0_crl() and CMS_add1_crl() return
1 for success and 0 for failure.
CMS_get1_certs() and CMS_get1_crls() return the STACK of certificates or CRLs
or NULL if there are none or an error occurs. The only error which will occur
in practice is if the B<cms> type is invalid.
=head1 SEE ALSO
L<ERR_get_error(3)|ERR_get_error(3)>,
L<CMS_sign(3)|CMS_sign(3)>,
L<CMS_encrypt(3)|CMS_encrypt(3)>
=head1 HISTORY
CMS_add0_cert(), CMS_add1_cert(), CMS_get1_certs(), CMS_add0_crl()
and CMS_get1_crls() were all first added to OpenSSL 0.9.8
=cut