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author | Jussi Kivilinna <jussi.kivilinna@mbnet.fi> | 2011-11-09 11:50:31 +0800 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2011-11-09 11:50:31 +0800 |
commit | 6c2205b8ffec035f4925b8ee84b7758afeee58b5 (patch) | |
tree | 85c202ee4056deaaddfee2c532eeabe44c02551d /include/crypto/lrw.h | |
parent | 171c02048f50d7187991f251ddeed2d7e5de104f (diff) | |
download | linux-stable-6c2205b8ffec035f4925b8ee84b7758afeee58b5.tar.gz linux-stable-6c2205b8ffec035f4925b8ee84b7758afeee58b5.tar.bz2 linux-stable-6c2205b8ffec035f4925b8ee84b7758afeee58b5.zip |
crypto: lrw - add interface for parallelized cipher implementions
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>
Diffstat (limited to 'include/crypto/lrw.h')
-rw-r--r-- | include/crypto/lrw.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/include/crypto/lrw.h b/include/crypto/lrw.h new file mode 100644 index 000000000000..25a2c8716375 --- /dev/null +++ b/include/crypto/lrw.h @@ -0,0 +1,43 @@ +#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 */ |