linux/include/crypto/lrw.h
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   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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