6c2205b8ff
Export gf128mul table initialization routines and add lrw_crypt() function that can be used by cipher implementations that can benefit from parallelized cipher operations. Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
#ifndef _CRYPTO_LRW_H
|
|
#define _CRYPTO_LRW_H
|
|
|
|
#include <crypto/b128ops.h>
|
|
|
|
struct scatterlist;
|
|
struct gf128mul_64k;
|
|
struct blkcipher_desc;
|
|
|
|
#define LRW_BLOCK_SIZE 16
|
|
|
|
struct lrw_table_ctx {
|
|
/* optimizes multiplying a random (non incrementing, as at the
|
|
* start of a new sector) value with key2, we could also have
|
|
* used 4k optimization tables or no optimization at all. In the
|
|
* latter case we would have to store key2 here */
|
|
struct gf128mul_64k *table;
|
|
/* stores:
|
|
* key2*{ 0,0,...0,0,0,0,1 }, key2*{ 0,0,...0,0,0,1,1 },
|
|
* key2*{ 0,0,...0,0,1,1,1 }, key2*{ 0,0,...0,1,1,1,1 }
|
|
* key2*{ 0,0,...1,1,1,1,1 }, etc
|
|
* needed for optimized multiplication of incrementing values
|
|
* with key2 */
|
|
be128 mulinc[128];
|
|
};
|
|
|
|
int lrw_init_table(struct lrw_table_ctx *ctx, const u8 *tweak);
|
|
void lrw_free_table(struct lrw_table_ctx *ctx);
|
|
|
|
struct lrw_crypt_req {
|
|
be128 *tbuf;
|
|
unsigned int tbuflen;
|
|
|
|
struct lrw_table_ctx *table_ctx;
|
|
void *crypt_ctx;
|
|
void (*crypt_fn)(void *ctx, u8 *blks, unsigned int nbytes);
|
|
};
|
|
|
|
int lrw_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
|
struct scatterlist *src, unsigned int nbytes,
|
|
struct lrw_crypt_req *req);
|
|
|
|
#endif /* _CRYPTO_LRW_H */
|