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CMS_ADD1_RECIPIENT_CERT(3) FreeBSD Library Functions Manual NAME CMS_add1_recipient_cert, CMS_add0_recipient_key - add recipients to a CMS EnvelopedData structure SYNOPSIS #include <openssl/cms.h> CMS_RecipientInfo * CMS_add1_recipient_cert(CMS_ContentInfo *cms, X509 *certificate, 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 These functions add a new RecipientInfo structure to the recipientInfos field of the EnvelopedData structure cms, which should have been obtained from an initial call to CMS_encrypt(3) with the flag CMS_PARTIAL set. CMS_add1_recipient_cert() adds the recipient certificate as a KeyTransRecipientInfo structure. CMS_add0_recipient_key() adds the symmetric key of length keylen using the wrapping algorithm nid, the identifier id of length idlen, and the optional values date, otherTypeId and otherType as a KEKRecipientInfo structure. The main purpose of these functions is to provide finer control over a CMS EnvelopedData structure where the simpler 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 CMS_RecipientInfo structure and the CMS attribute utility functions. By default, recipient certificates are identified using issuer name and serial number. If the flag CMS_USE_KEYID is set, the subject key identifier value is used 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 CMS_ContentInfo_new(3), CMS_encrypt(3), CMS_final(3), ERR_get_error(3) STANDARDS RFC 5652: Cryptographic Message Syntax - section 6.1: EnvelopedData Type - section 6.2.1: KeyTransRecipientInfo Type - section 6.2.3: KEKRecipientInfo Type HISTORY CMS_add1_recipient_cert() and CMS_add0_recipient_key() first appeared in OpenSSL 0.9.8h and have been available since OpenBSD 6.7. FreeBSD 14.1-RELEASE-p8 November 2, 2019 FreeBSD 14.1-RELEASE-p8