mkb.h 5.08 KB
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/*
 * This file is part of libaacs
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 * Copyright (C) 2009-2010  Obliter0n
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 *
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 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see
 * <http://www.gnu.org/licenses/>.
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 */

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#ifndef MKB_H_
#define MKB_H_

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#include "util/attributes.h"
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#include <stdlib.h>
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#include <stdint.h>

typedef struct mkb MKB;

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struct aacs_file_s;

AACS_PRIVATE MKB *mkb_read(struct aacs_file_s *fp);    // init MKB
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AACS_PRIVATE MKB *mkb_init(uint8_t *data, int len); // init MKB from data
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AACS_PRIVATE void mkb_close(MKB *mkb);           // free MKB
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AACS_PRIVATE const uint8_t *mkb_data(MKB *mkb);
AACS_PRIVATE size_t mkb_data_size(MKB *mkb);

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// returns type
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AACS_PRIVATE uint8_t mkb_type(MKB *mkb);
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// returns version
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AACS_PRIVATE uint32_t mkb_version(MKB *mkb);
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// returns type and version record (required to verify signatures)
AACS_PRIVATE const uint8_t *mkb_type_and_version_record(MKB *mkb);
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// returns list of revoked host entries
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AACS_PRIVATE const uint8_t *mkb_host_revokation_entries(MKB *mkb, size_t *len);
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// returns list of revoked drive entries
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AACS_PRIVATE const uint8_t *mkb_drive_revokation_entries(MKB *mkb, size_t *len);
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// returns subset-diff records
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AACS_PRIVATE const uint8_t *mkb_subdiff_records(MKB *mkb, size_t *len);
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// returns list of subset-diff offsets
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AACS_PRIVATE const uint8_t *mkb_subdiff_offsets(MKB *mkb, size_t *len);
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// returns list of cvalues
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AACS_PRIVATE const uint8_t *mkb_cvalues(MKB *mkb, size_t *len);
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// media key verification data return in param (always 16 bytes)
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AACS_PRIVATE const uint8_t *mkb_mk_dv(MKB *mkb);
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// returns MKB signature
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AACS_PRIVATE const uint8_t *mkb_signature(MKB *mkb, size_t *len);
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AACS_PRIVATE int mkb_host_cert_is_revoked(MKB *mkb, const uint8_t *cert_id);
AACS_PRIVATE int mkb_drive_cert_is_revoked(MKB *mkb, const uint8_t *cert_id);

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/* The Media Key block is of variable size but must be a multiple of 4
 * MKB Structure:
 *      Type and Version record (12 bytes)
 *          0   | type = 0x10
 *          1-3 | length = 0x00000c
 *          4-7 | MKB type = 0x000?1003
 *          8-11| MKB version
 *          
 *      Host Revokation List record (variable - multiple of 4 bytes)
 *          0                        | type = 0x21
 *          1-3                      | length
 *          4-7                      | total entries
 *          8-11                     | entires in signature block 1 (N1)
 *          12-19                    | host revokation list entry 0
 *          .
 *          .
 *          (12+(N1-1)*8)-(12+N1*8)-1| entry n
 *          (12+ N1*8)-(52+ N1*8)-1  | block 1 signature
 *          (52+ N1*8)-(length-1)    | more signature blocks
 *          
 *          Host Rekovation List entry (8 bytes)
 *              0-1| range
 *              2-7| host id
 *              
 *      Drive Revokation List record (variable - multiple of 4 bytes)
 *          0                        | type = 0x20
 *          1-3                      | length
 *          4-7                      | total entries
 *          8-11                     | entires in signature block 1 (N1)
 *          12-19                    | drive revokation list entry 0
 *          .
 *          .
 *          (12+(N1-1)*8)-(12+N1*8)-1| entry n
 *          (12+ N1*8)-(52+ N1*8)-1  | block 1 signature
 *          (52+ N1*8)-(length-1)    | more signature blocks
 *          
 *          Drive Rekovation List entry (8 bytes)
 *              0-1| range
 *              2-7| host id
 *              
 *      Verify Media Key record
 *          0   | type = 0x81
 *          1-3 | length = 0x14
 *          4-19| verification data (Dv)
 *          
 *      Explicit Subset-Difference record (variable - multiple of 4 bytes)
 *          0       | type = 0x04
 *          1-3     | length
 *          4       | uv mask 0
 *          5-8     | uv number 0
 *          .
 *          .
 *          length-1| end of uv number n
 *      
 *      Subset-Difference Index record (variable, padded - multiple of 4 bytes)
 *          0       | type = 0x07
 *          1-3     | length
 *          4-7     | span (number of devices)
 *          8-10    | offset 0
 *          .
 *          .
 *          length-1| end of offset n
 *          
 *      Media Key Data / cvalue record (variable - muliple of 4 bytes)
 *          0       | type = 0x05
 *          1-3     | length
 *          4-19    | media key data 0
 *          .
 *          .
 *          length-1| end of media key data n
 *          
 *      End of Media Key Block record (variable - multiple of 4 bytes)
 *          0         | type = 0x02
 *          1-3       | length
 *          4-length-1| signature
*/

#endif /* MKB_H_ */