[B<-verify>]
[B<-cmsout>]
[B<-resign>]
+[B<-cades>]
[B<-data_create>]
[B<-data_out>]
[B<-digest_create>]
Resign a message: take an existing message and one or more new signers.
+=item B<-cades>
+
+Add an ESS signing-certificate or ESS signing-certificate-v2 signed-attribute to the SignerInfo, in order to make
+the signature comply with the requirements for a CAdES Basic Electronic Signature (CAdES-BES). See the NOTES
+section for more details.
+
=item B<-data_create>
Create a CMS B<Data> type.
and return an error if no recipient can be found: this option should be used
with caution. For a fuller description see L<CMS_decrypt(3)>).
+=head1 CAdES Basic Electronic Signature (CAdES-BES)
+
+A CAdES Basic Electronic Signature (CAdES-BES), as defined in the European Standard ETSI EN 319 122-1 V1.1.1, contains:
+
+=over 4
+
+=item *
+
+The signed user data as defined in CMS (RFC 3852);
+
+=item *
+
+Content-type of the EncapsulatedContentInfo value being signed;
+
+=item *
+
+Message-digest of the eContent OCTET STRING within encapContentInfo being signed;
+
+=item *
+
+An ESS signing-certificate or ESS signing-certificate-v2 attribute, as defined in Enhanced Security Services (ESS), RFC 2634 and RFC 5035.
+An ESS signing-certificate attribute only allows for the use of SHA-1 as a digest algorithm.
+An ESS signing-certificate-v2 attribute allows for the use of any digest algorithm.
+
+=item *
+
+The digital signature value computed on the user data and, when present, on the signed attributes.
+
+Note that currently the B<-cades> option applies only to the B<-sign> operation and is ignored during
+the B<-verify> operation, i.e. the signing certification is not checked during the verification process.
+This feature might be added in a future version.
+
+=back
+
=head1 EXIT CODES
=over 4