mirror of https://github.com/openssl/openssl.git
140 lines
6.3 KiB
Plaintext
140 lines
6.3 KiB
Plaintext
=pod
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=head1 NAME
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CMS_get0_RecipientInfos, CMS_RecipientInfo_type,
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CMS_RecipientInfo_ktri_get0_signer_id, CMS_RecipientInfo_ktri_cert_cmp,
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CMS_RecipientInfo_set0_pkey, CMS_RecipientInfo_kekri_get0_id,
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CMS_RecipientInfo_kekri_id_cmp, CMS_RecipientInfo_set0_key,
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CMS_RecipientInfo_decrypt, CMS_RecipientInfo_encrypt
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- CMS envelopedData RecipientInfo routines
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=head1 SYNOPSIS
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#include <openssl/cms.h>
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STACK_OF(CMS_RecipientInfo) *CMS_get0_RecipientInfos(CMS_ContentInfo *cms);
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int CMS_RecipientInfo_type(CMS_RecipientInfo *ri);
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int CMS_RecipientInfo_ktri_get0_signer_id(CMS_RecipientInfo *ri,
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ASN1_OCTET_STRING **keyid,
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X509_NAME **issuer,
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ASN1_INTEGER **sno);
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int CMS_RecipientInfo_ktri_cert_cmp(CMS_RecipientInfo *ri, X509 *cert);
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int CMS_RecipientInfo_set0_pkey(CMS_RecipientInfo *ri, EVP_PKEY *pkey);
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int CMS_RecipientInfo_kekri_get0_id(CMS_RecipientInfo *ri, X509_ALGOR **palg,
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ASN1_OCTET_STRING **pid,
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ASN1_GENERALIZEDTIME **pdate,
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ASN1_OBJECT **potherid,
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ASN1_TYPE **pothertype);
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int CMS_RecipientInfo_kekri_id_cmp(CMS_RecipientInfo *ri,
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const unsigned char *id, size_t idlen);
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int CMS_RecipientInfo_set0_key(CMS_RecipientInfo *ri,
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unsigned char *key, size_t keylen);
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int CMS_RecipientInfo_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri);
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int CMS_RecipientInfo_encrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri);
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=head1 DESCRIPTION
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The function CMS_get0_RecipientInfos() returns all the CMS_RecipientInfo
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structures associated with a CMS EnvelopedData structure.
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CMS_RecipientInfo_type() returns the type of CMS_RecipientInfo structure B<ri>.
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It will currently return CMS_RECIPINFO_TRANS, CMS_RECIPINFO_AGREE,
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CMS_RECIPINFO_KEK, CMS_RECIPINFO_PASS, or CMS_RECIPINFO_OTHER.
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CMS_RecipientInfo_ktri_get0_signer_id() retrieves the certificate recipient
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identifier associated with a specific CMS_RecipientInfo structure B<ri>, which
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must be of type CMS_RECIPINFO_TRANS. Either the keyidentifier will be set in
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B<keyid> or B<both> issuer name and serial number in B<issuer> and B<sno>.
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CMS_RecipientInfo_ktri_cert_cmp() compares the certificate B<cert> against the
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CMS_RecipientInfo structure B<ri>, which must be of type CMS_RECIPINFO_TRANS.
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It returns zero if the comparison is successful and non zero if not.
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CMS_RecipientInfo_set0_pkey() associates the private key B<pkey> with
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the CMS_RecipientInfo structure B<ri>, which must be of type
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CMS_RECIPINFO_TRANS.
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CMS_RecipientInfo_kekri_get0_id() retrieves the key information from the
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CMS_RecipientInfo structure B<ri> which must be of type CMS_RECIPINFO_KEK. Any
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of the remaining parameters can be NULL if the application is not interested in
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the value of a field. Where a field is optional and absent NULL will be written
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to the corresponding parameter. The keyEncryptionAlgorithm field is written to
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B<palg>, the B<keyIdentifier> field is written to B<pid>, the B<date> field if
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present is written to B<pdate>, if the B<other> field is present the components
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B<keyAttrId> and B<keyAttr> are written to parameters B<potherid> and
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B<pothertype>.
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CMS_RecipientInfo_kekri_id_cmp() compares the ID in the B<id> and B<idlen>
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parameters against the B<keyIdentifier> CMS_RecipientInfo structure B<ri>,
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which must be of type CMS_RECIPINFO_KEK. It returns zero if the comparison is
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successful and non zero if not.
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CMS_RecipientInfo_set0_key() associates the symmetric key B<key> of length
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B<keylen> with the CMS_RecipientInfo structure B<ri>, which must be of type
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CMS_RECIPINFO_KEK.
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CMS_RecipientInfo_decrypt() attempts to decrypt CMS_RecipientInfo structure
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B<ri> in structure B<cms>. A key must have been associated with the structure
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first.
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CMS_RecipientInfo_encrypt() attempts to encrypt CMS_RecipientInfo structure
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B<ri> in structure B<cms>. A key must have been associated with the structure
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first and the content encryption key must be available: for example by a
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previous call to CMS_RecipientInfo_decrypt().
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=head1 NOTES
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The main purpose of these functions is to enable an application to lookup
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recipient keys using any appropriate technique when the simpler method
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of CMS_decrypt() is not appropriate.
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In typical usage and application will retrieve all CMS_RecipientInfo structures
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using CMS_get0_RecipientInfos() and check the type of each using
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CMS_RecipientInfo_type(). Depending on the type the CMS_RecipientInfo structure
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can be ignored or its key identifier data retrieved using an appropriate
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function. Then if the corresponding secret or private key can be obtained by
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any appropriate means it can then associated with the structure and
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CMS_RecipientInfo_decrypt() called. If successful CMS_decrypt() can be called
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with a NULL key to decrypt the enveloped content.
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The CMS_RecipientInfo_encrypt() can be used to add a new recipient to an
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existing enveloped data structure. Typically an application will first decrypt
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an appropriate CMS_RecipientInfo structure to make the content encrypt key
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available, it will then add a new recipient using a function such as
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CMS_add1_recipient_cert() and finally encrypt the content encryption key
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using CMS_RecipientInfo_encrypt().
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=head1 RETURN VALUES
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CMS_get0_RecipientInfos() returns all CMS_RecipientInfo structures, or NULL if
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an error occurs.
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CMS_RecipientInfo_ktri_get0_signer_id(), CMS_RecipientInfo_set0_pkey(),
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CMS_RecipientInfo_kekri_get0_id(), CMS_RecipientInfo_set0_key() and
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CMS_RecipientInfo_decrypt() return 1 for success or 0 if an error occurs.
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CMS_RecipientInfo_encrypt() return 1 for success or 0 if an error occurs.
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CMS_RecipientInfo_ktri_cert_cmp() and CMS_RecipientInfo_kekri_cmp() return 0
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for a successful comparison and non zero otherwise.
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Any error can be obtained from L<ERR_get_error(3)>.
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=head1 SEE ALSO
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L<ERR_get_error(3)>, L<CMS_decrypt(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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