1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _CRYPTO_LRW_H 3 #define _CRYPTO_LRW_H 4 5 #include <crypto/b128ops.h> 6 7 struct scatterlist; 8 struct gf128mul_64k; 9 struct blkcipher_desc; 10 11 #define LRW_BLOCK_SIZE 16 12 13 struct 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 28 int lrw_init_table(struct lrw_table_ctx *ctx, const u8 *tweak); 29 void lrw_free_table(struct lrw_table_ctx *ctx); 30 31 struct 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 40 int 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 */ 45