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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>
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#ifndef _CRYPTO_LRW_H | |||
#define _CRYPTO_LRW_H | |||
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#include <crypto/b128ops.h> | |||
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struct scatterlist; | |||
struct gf128mul_64k; | |||
struct blkcipher_desc; | |||
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#define LRW_BLOCK_SIZE 16 | |||
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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]; | |||
}; | |||
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int lrw_init_table(struct lrw_table_ctx *ctx, const u8 *tweak); | |||
void lrw_free_table(struct lrw_table_ctx *ctx); | |||
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struct lrw_crypt_req { | |||
be128 *tbuf; | |||
unsigned int tbuflen; | |||
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struct lrw_table_ctx *table_ctx; | |||
void *crypt_ctx; | |||
void (*crypt_fn)(void *ctx, u8 *blks, unsigned int nbytes); | |||
}; | |||
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int lrw_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, | |||
struct scatterlist *src, unsigned int nbytes, | |||
struct lrw_crypt_req *req); | |||
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#endif /* _CRYPTO_LRW_H */ |