=pod =head1 NAME CMS_add1_recipient_cert, CMS_add0_recipient_key - add recipients to a CMS enveloped data structure =head1 SYNOPSIS #include 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); =head1 DESCRIPTION CMS_add1_recipient_cert() adds recipient B to CMS_ContentInfo enveloped data structure B as a KeyTransRecipientInfo structure. CMS_add0_recipient_key() adds symmetric key B of length B using wrapping algorithm B, identifier B of length B and optional values B, B and B to CMS_ContentInfo enveloped data structure B as a KEKRecipientInfo structure. The CMS_ContentInfo structure should be obtained from an initial call to CMS_encrypt() with the flag B set. =head1 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 B 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 B, specifically: NID_id_aes128_wrap, NID_id_aes192_wrap and NID_id_aes256_wrap. If B is set to B then an AES wrap algorithm will be used consistent with B. =head1 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. =head1 SEE ALSO L, L, L, =head1 HISTORY CMS_add1_recipient_cert() and CMS_add0_recipient_key() were added to OpenSSL 0.9.8 =cut