.\" $OpenBSD: CMS_add1_recipient_cert.3,v 1.5 2019/08/13 23:54:16 schwarze Exp $ .\" full merge up to: OpenSSL e9b77246 Jan 20 19:58:49 2017 +0100 .\" .\" This file is a derived work. .\" The changes are covered by the following Copyright and license: .\" .\" Copyright (c) 2019 Ingo Schwarze .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. 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IN NO EVENT SHALL THE OpenSSL PROJECT OR .\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, .\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; .\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, .\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED .\" OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd $Mdocdate: August 13 2019 $ .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 EnvelopedData structure .Sh SYNOPSIS .In openssl/cms.h .Ft CMS_RecipientInfo * .Fo CMS_add1_recipient_cert .Fa "CMS_ContentInfo *cms" .Fa "X509 *certificate" .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 These functions add a new .Vt RecipientInfo structure to the .Fa recipientInfos field of the .Vt EnvelopedData structure .Fa cms , which should have been obtained from an initial call to .Xr CMS_encrypt 3 with the flag .Dv CMS_PARTIAL set. .Pp .Fn CMS_add1_recipient_cert adds the recipient .Fa certificate as a .Vt KeyTransRecipientInfo structure. .Pp .Fn CMS_add0_recipient_key adds the symmetric .Fa key of length .Fa keylen using the wrapping algorithm .Fa nid , the identifier .Fa id of length .Fa idlen , and the optional values .Fa date , .Fa otherTypeId and .Fa otherType as a .Vt KEKRecipientInfo structure. .Pp The main purpose of these functions is to provide finer control over a CMS .Vt EnvelopedData structure where the simpler .Xr CMS_encrypt 3 function defaults are not appropriate, for example if one or more .Vt 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 By default, recipient certificates are identified using issuer name and serial number. If the flag .Dv 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. .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_encrypt 3 , .Xr CMS_final 3 , .Xr ERR_get_error 3 .Sh STANDARDS RFC 5652: Cryptographic Message Syntax .Bl -dash -compact -offset indent .It section 6.1: EnvelopedData Type .It section 6.2.1: KeyTransRecipientInfo Type .It section 6.2.3: KEKRecipientInfo Type .El .Sh HISTORY .Fn CMS_add1_recipient_cert and .Fn CMS_add0_recipient_key first appeared in OpenSSL 0.9.8h and have been available since .Ox 6.6 .