Root/include/crypto/lrw.h

1#ifndef _CRYPTO_LRW_H
2#define _CRYPTO_LRW_H
3
4#include <crypto/b128ops.h>
5
6struct scatterlist;
7struct gf128mul_64k;
8struct blkcipher_desc;
9
10#define LRW_BLOCK_SIZE 16
11
12struct lrw_table_ctx {
13    /* optimizes multiplying a random (non incrementing, as at the
14     * start of a new sector) value with key2, we could also have
15     * used 4k optimization tables or no optimization at all. In the
16     * latter case we would have to store key2 here */
17    struct gf128mul_64k *table;
18    /* stores:
19     * key2*{ 0,0,...0,0,0,0,1 }, key2*{ 0,0,...0,0,0,1,1 },
20     * key2*{ 0,0,...0,0,1,1,1 }, key2*{ 0,0,...0,1,1,1,1 }
21     * key2*{ 0,0,...1,1,1,1,1 }, etc
22     * needed for optimized multiplication of incrementing values
23     * with key2 */
24    be128 mulinc[128];
25};
26
27int lrw_init_table(struct lrw_table_ctx *ctx, const u8 *tweak);
28void lrw_free_table(struct lrw_table_ctx *ctx);
29
30struct lrw_crypt_req {
31    be128 *tbuf;
32    unsigned int tbuflen;
33
34    struct lrw_table_ctx *table_ctx;
35    void *crypt_ctx;
36    void (*crypt_fn)(void *ctx, u8 *blks, unsigned int nbytes);
37};
38
39int lrw_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
40          struct scatterlist *src, unsigned int nbytes,
41          struct lrw_crypt_req *req);
42
43#endif /* _CRYPTO_LRW_H */
44

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