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-.Dd $Mdocdate: November 11 2015 $
-.Dt CMS_ADD1_RECIPIENT_CERT 3
-.Os
-.Sh NAME
-.Nm CMS_add1_recipient_cert ,
-.Nm CMS_add0_recipient_key
-.Nd add recipients to a CMS enveloped data structure
-.Sh SYNOPSIS
-.In openssl/cms.h
-.Ft CMS_RecipientInfo *
-.Fo CMS_add1_recipient_cert
-.Fa "CMS_ContentInfo *cms"
-.Fa "X509 *recip"
-.Fa "unsigned int flags"
-.Fc
-.Ft CMS_RecipientInfo *
-.Fo CMS_add0_recipient_key
-.Fa "CMS_ContentInfo *cms"
-.Fa "int nid"
-.Fa "unsigned char *key"
-.Fa "size_t keylen"
-.Fa "unsigned char *id"
-.Fa "size_t idlen"
-.Fa "ASN1_GENERALIZEDTIME *date"
-.Fa "ASN1_OBJECT *otherTypeId"
-.Fa "ASN1_TYPE *otherType"
-.Fc
-.Sh DESCRIPTION
-.Fn CMS_add1_recipient_cert
-adds recipient
-.Fa recip
-to the
-.Vt CMS_ContentInfo
-enveloped data structure
-.Fa cms
-as a KeyTransRecipientInfo structure.
-.Pp
-.Fn CMS_add0_recipient_key
-adds the symmetric key
-.Fa key
-of length
-.Fa keylen
-using the wrapping algorithm
-.Fa nid ,
-identifier
-.Fa id
-of length
-.Fa idlen
-and optional values
-.Fa date ,
-.Fa otherTypeId ,
-and
-.Fa otherType
-to the
-.Vt CMS_ContentInfo
-enveloped data structure
-.Fa cms
-as a KEKRecipientInfo structure.
-.Pp
-The
-.Vt CMS_ContentInfo
-structure should be obtained from an initial call to
-.Xr CMS_encrypt 3
-with the flag
-.Dv CMS_PARTIAL
-set.
-.Sh NOTES
-The main purpose of this function is to provide finer control over a CMS
-enveloped data structure where the simpler
-.Xr CMS_encrypt 3
-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
-.Vt CMS_RecipientInfo
-structure and the CMS attribute utility functions.
-.Pp
-OpenSSL will by default identify recipient certificates using issuer
-name and serial number.
-If
-.Dv 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.
-.Pp
-Currently only AES based key wrapping algorithms are supported for
-.Fa nid ,
-specifically:
-.Dv NID_id_aes128_wrap ,
-.Dv NID_id_aes192_wrap ,
-and
-.Dv NID_id_aes256_wrap .
-If
-.Fa nid
-is set to
-.Dv NID_undef ,
-then an AES wrap algorithm will be used consistent with
-.Fa keylen .
-.Sh RETURN VALUES
-.Fn CMS_add1_recipient_cert
-and
-.Fn CMS_add0_recipient_key
-return an internal pointer to the
-.Vt CMS_RecipientInfo
-structure just added or
-.Dv NULL
-if an error occurs.
-.Sh SEE ALSO
-.Xr CMS_decrypt 3 ,
-.Xr CMS_final 3 ,
-.Xr ERR_get_error 3
-.Sh HISTORY
-.Fn CMS_add1_recipient_cert
-and
-.Fn CMS_add0_recipient_key
-were added to OpenSSL 0.9.8.