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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _CRYPTO_LRW_H
3#define _CRYPTO_LRW_H
4
5#include <crypto/b128ops.h>
6
7struct scatterlist;
8struct gf128mul_64k;
9struct blkcipher_desc;
10
11#define LRW_BLOCK_SIZE 16
12
13struct lrw_table_ctx {
14 /* optimizes multiplying a random (non incrementing, as at the
15 * start of a new sector) value with key2, we could also have
16 * used 4k optimization tables or no optimization at all. In the
17 * latter case we would have to store key2 here */
18 struct gf128mul_64k *table;
19 /* stores:
20 * key2*{ 0,0,...0,0,0,0,1 }, key2*{ 0,0,...0,0,0,1,1 },
21 * key2*{ 0,0,...0,0,1,1,1 }, key2*{ 0,0,...0,1,1,1,1 }
22 * key2*{ 0,0,...1,1,1,1,1 }, etc
23 * needed for optimized multiplication of incrementing values
24 * with key2 */
25 be128 mulinc[128];
26};
27
28int lrw_init_table(struct lrw_table_ctx *ctx, const u8 *tweak);
29void lrw_free_table(struct lrw_table_ctx *ctx);
30
31struct lrw_crypt_req {
32 be128 *tbuf;
33 unsigned int tbuflen;
34
35 struct lrw_table_ctx *table_ctx;
36 void *crypt_ctx;
37 void (*crypt_fn)(void *ctx, u8 *blks, unsigned int nbytes);
38};
39
40int lrw_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
41 struct scatterlist *src, unsigned int nbytes,
42 struct lrw_crypt_req *req);
43
44#endif /* _CRYPTO_LRW_H */