Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
lrw.h
Go to the documentation of this file.
1 #ifndef _CRYPTO_LRW_H
2 #define _CRYPTO_LRW_H
3 
4 #include <crypto/b128ops.h>
5 
6 struct scatterlist;
7 struct gf128mul_64k;
8 struct blkcipher_desc;
9 
10 #define LRW_BLOCK_SIZE 16
11 
12 struct 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 */
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 
27 int lrw_init_table(struct lrw_table_ctx *ctx, const u8 *tweak);
28 void lrw_free_table(struct lrw_table_ctx *ctx);
29 
30 struct lrw_crypt_req {
32  unsigned int tbuflen;
33 
35  void *crypt_ctx;
36  void (*crypt_fn)(void *ctx, u8 *blks, unsigned int nbytes);
37 };
38 
39 int 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 */