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• NAME
• SYNOPSIS
• DESCRIPTION
• NOTES
• RETURN VALUES
• SEE ALSO
• COPYRIGHT

NAME

CMS_add1_recipient_cert, CMS_add0_recipient_key - add recipients to a CMS enveloped data structure

SYNOPSIS

 #include <openssl/cms.h>

 CMS_RecipientInfo *CMS_add1_recipient_cert(CMS_ContentInfo *cms,
                                            X509 *recip, unsigned int flags);

 CMS_RecipientInfo *CMS_add0_recipient_key(CMS_ContentInfo *cms, int nid,
                                           unsigned char *key, size_t keylen,
                                           unsigned char *id, size_t idlen,
                                           ASN1_GENERALIZEDTIME *date,
                                           ASN1_OBJECT *otherTypeId,
                                           ASN1_TYPE *otherType);

DESCRIPTION

CMS_add1_recipient_cert() adds recipient recip to CMS_ContentInfo enveloped data structure cms as a KeyTransRecipientInfo structure.

CMS_add0_recipient_key() adds symmetric key key of length keylen using wrapping algorithm nid, identifier id of length idlen and optional values date, otherTypeId and otherType to CMS_ContentInfo enveloped data structure cms as a KEKRecipientInfo structure.

The CMS_ContentInfo structure should be obtained from an initial call to CMS_encrypt() with the flag CMS_PARTIAL set.

NOTES

The main purpose of this function is to provide finer control over a CMS enveloped data structure where the simpler CMS_encrypt() function defaults are not appropriate. For example if one or more KEKRecipientInfo structures need to be added. New attributes can also be added using the returned CMS_RecipientInfo structure and the CMS attribute utility functions.

OpenSSL will by default identify recipient certificates using issuer name and serial number. If CMS_USE_KEYID is set it will use the subject key identifier value instead. An error occurs if all recipient certificates do not have a subject key identifier extension.

Currently only AES based key wrapping algorithms are supported for nid, specifically: NID_id_aes128_wrap, NID_id_aes192_wrap and NID_id_aes256_wrap. If nid is set to NID_undef then an AES wrap algorithm will be used consistent with keylen.

RETURN VALUES

CMS_add1_recipient_cert() and CMS_add0_recipient_key() return an internal pointer to the CMS_RecipientInfo structure just added or NULL if an error occurs.

SEE ALSO

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

COPYRIGHT

Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (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.