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