2008-04-09 06:27:10 +08:00
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=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, X509 *recip, unsigned int flags);
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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);
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=head1 DESCRIPTION
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CMS_add1_recipient_cert() adds a recipient certificate B<recip>
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CMS_ContentInfo enveloped data structure B<cms> as a KeyTransRecipientInfo
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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> or length B<idlen> and optional
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2008-04-10 18:46:11 +08:00
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values B<date>, B<otherTypeId> and B<otherType> to CMS_ContentInfo enveloped
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2008-04-09 06:27:10 +08:00
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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)|ERR_get_error(3)>, L<CMS_decrypt(3)|CMS_decrypt(3)>,
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L<CMS_final(3)|CMS_final(3)>,
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=head1 HISTORY
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CMS_add1_recipient_cert() and CMS_add0_recipient_key() were added to OpenSSL
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0.9.8
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=cut
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