44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
#ifndef _CRYPTO_LRW_H
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#define _CRYPTO_LRW_H
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#include <crypto/b128ops.h>
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struct scatterlist;
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struct gf128mul_64k;
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struct blkcipher_desc;
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#define LRW_BLOCK_SIZE 16
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struct lrw_table_ctx {
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/* optimizes multiplying a random (non incrementing, as at the
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* start of a new sector) value with key2, we could also have
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* used 4k optimization tables or no optimization at all. In the
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* latter case we would have to store key2 here */
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struct gf128mul_64k *table;
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/* stores:
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* key2*{ 0,0,...0,0,0,0,1 }, key2*{ 0,0,...0,0,0,1,1 },
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* key2*{ 0,0,...0,0,1,1,1 }, key2*{ 0,0,...0,1,1,1,1 }
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* key2*{ 0,0,...1,1,1,1,1 }, etc
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* needed for optimized multiplication of incrementing values
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* with key2 */
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be128 mulinc[128];
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};
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int lrw_init_table(struct lrw_table_ctx *ctx, const u8 *tweak);
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void lrw_free_table(struct lrw_table_ctx *ctx);
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struct lrw_crypt_req {
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be128 *tbuf;
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unsigned int tbuflen;
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struct lrw_table_ctx *table_ctx;
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void *crypt_ctx;
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void (*crypt_fn)(void *ctx, u8 *blks, unsigned int nbytes);
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};
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int lrw_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes,
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struct lrw_crypt_req *req);
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#endif /* _CRYPTO_LRW_H */
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