wii_crypto.h

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/*
 * This file is part of the Aaru Data Preservation Suite.
 * Copyright (c) 2019-2026 Natalia Portillo.
 *
 * 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; version 2.1 of the License.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see
 * <https://www.gnu.org/licenses/>.
 *
 * Nintendo Wii disc encryption: partition key map, group encrypt/decrypt.
 */
 
#ifndef LIBAARUFORMAT_NGCW_WII_CRYPTO_H
#define LIBAARUFORMAT_NGCW_WII_CRYPTO_H
 
#include <stdbool.h>
#include <stdint.h>
 
/* Forward declaration — guard against redefinition when aaruformat.h is also included */
#ifndef AARUFORMAT_CONTEXT_DECLARED
#define AARUFORMAT_CONTEXT_DECLARED
typedef struct aaruformat_context aaruformat_context;
#endif
 
#ifdef __cplusplus
extern "C"
{
#endif
 
#define WII_GROUP_SIZE        0x8000 
#define WII_GROUP_HASH_SIZE   0x0400 
#define WII_GROUP_DATA_SIZE   0x7C00 
#define WII_LOGICAL_PER_GROUP 16     
#define WII_SECTOR_SIZE       2048   
#define WII_MAX_PARTITIONS    32     

    typedef struct WiiPartitionRegion
    {
        uint32_t start_sector; 
        uint32_t end_sector;   
        uint8_t  key[16];      
    } WiiPartitionRegion;

    const uint8_t *wii_get_sector_key(const WiiPartitionRegion *regions, uint32_t region_count,
                                      uint64_t logical_sector);

    bool wii_is_sector_encrypted(const WiiPartitionRegion *regions, uint32_t region_count, uint64_t logical_sector);

    void wii_encrypt_group(const uint8_t key[16], const uint8_t *hash_block, const uint8_t *data_in, uint8_t *out);

    void wii_decrypt_group(const uint8_t key[16], const uint8_t *in, uint8_t *hash_block, uint8_t *data_out);

    int32_t wii_serialize_partition_key_map(const WiiPartitionRegion *regions, uint32_t count, uint8_t **out_data,
                                            uint32_t *out_len);

    int32_t wii_deserialize_partition_key_map(const uint8_t *data, uint32_t data_len, WiiPartitionRegion **regions,
                                              uint32_t *count);

    void wii_lazy_init(aaruformat_context *ctx);
 
#ifdef __cplusplus
}
#endif
 
#endif /* LIBAARUFORMAT_NGCW_WII_CRYPTO_H */