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$NetBSD: CMS_add1_recipient_cert.3,v 1.1.1.2 2023/04/18 14:19:13 christos Exp $

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Title "CMS_add1_recipient_cert 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
.nh CMS_add1_recipient_cert, CMS_add0_recipient_key - add recipients to a CMS enveloped data structure libcrypto, -lcrypto Header "SYNOPSIS" .Vb 1 #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); .Ve Header "DESCRIPTION" \fBCMS_add1_recipient_cert() adds recipient recip to CMS_ContentInfo enveloped data structure cms as a KeyTransRecipientInfo structure.

\fBCMS_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 \fBCMS_encrypt() with the flag \s-1CMS_PARTIAL\s0 set.

Header "NOTES" The main purpose of this function is to provide finer control over a \s-1CMS\s0 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 \s-1CMS\s0 attribute utility functions.

OpenSSL will by default identify recipient certificates using issuer name and serial number. If \s-1CMS_USE_KEYID\s0 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 \s-1AES\s0 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 \s-1AES\s0 wrap algorithm will be used consistent with keylen.

Header "RETURN VALUES" \fBCMS_add1_recipient_cert() and CMS_add0_recipient_key() return an internal pointer to the CMS_RecipientInfo structure just added or \s-1NULL\s0 if an error occurs. Header "SEE ALSO" \fBERR_get_error\|(3), CMS_decrypt\|(3), \fBCMS_final\|(3), Header "COPYRIGHT" Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.

Indexes created Wed Apr 29 00:23:26 UTC 2026