e9b7724687
I tried hard to keep the lines at 80 characters or less, but in a few cases I had to punt and just indented the subsequent lines by 4 spaces. A few well-placed typedefs for callback functions would really help, but these would be part of the API, so that's probably for later. I also took the liberty of inserting empty lines in overlong blocks to provide some visual space. Reviewed-by: Rich Salz <rsalz@openssl.org> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/1956)
72 lines
2.7 KiB
Text
72 lines
2.7 KiB
Text
=pod
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=head1 NAME
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CMS_add1_recipient_cert, CMS_add0_recipient_key - add recipients to a CMS enveloped data structure
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=head1 SYNOPSIS
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#include <openssl/cms.h>
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CMS_RecipientInfo *CMS_add1_recipient_cert(CMS_ContentInfo *cms,
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X509 *recip, unsigned int flags);
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CMS_RecipientInfo *CMS_add0_recipient_key(CMS_ContentInfo *cms, int nid,
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unsigned char *key, size_t keylen,
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unsigned char *id, size_t idlen,
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ASN1_GENERALIZEDTIME *date,
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ASN1_OBJECT *otherTypeId,
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ASN1_TYPE *otherType);
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=head1 DESCRIPTION
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CMS_add1_recipient_cert() adds recipient B<recip> to CMS_ContentInfo enveloped
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data structure B<cms> as a KeyTransRecipientInfo structure.
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CMS_add0_recipient_key() adds symmetric key B<key> of length B<keylen> using
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wrapping algorithm B<nid>, identifier B<id> of length B<idlen> and optional
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values B<date>, B<otherTypeId> and B<otherType> to CMS_ContentInfo enveloped
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data structure B<cms> as a KEKRecipientInfo structure.
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The CMS_ContentInfo structure should be obtained from an initial call to
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CMS_encrypt() with the flag B<CMS_PARTIAL> set.
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=head1 NOTES
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The main purpose of this function is to provide finer control over a CMS
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enveloped data structure where the simpler CMS_encrypt() function defaults are
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not appropriate. For example if one or more KEKRecipientInfo structures
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need to be added. New attributes can also be added using the returned
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CMS_RecipientInfo structure and the CMS attribute utility functions.
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OpenSSL will by default identify recipient certificates using issuer name
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and serial number. If B<CMS_USE_KEYID> is set it will use the subject key
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identifier value instead. An error occurs if all recipient certificates do not
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have a subject key identifier extension.
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Currently only AES based key wrapping algorithms are supported for B<nid>,
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specifically: NID_id_aes128_wrap, NID_id_aes192_wrap and NID_id_aes256_wrap.
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If B<nid> is set to B<NID_undef> then an AES wrap algorithm will be used
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consistent with B<keylen>.
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=head1 RETURN VALUES
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CMS_add1_recipient_cert() and CMS_add0_recipient_key() return an internal
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pointer to the CMS_RecipientInfo structure just added or NULL if an error
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occurs.
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=head1 SEE ALSO
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L<ERR_get_error(3)>, L<CMS_decrypt(3)>,
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L<CMS_final(3)>,
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=head1 COPYRIGHT
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Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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