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),
HISTORY¶
CMS_add1_recipient_cert() and
CMS_add0_recipient_key() were added
to OpenSSL 0.9.8