mirror of
https://github.com/torvalds/linux
synced 2024-09-06 18:01:05 +00:00
crypto: lrw - remove lrw_crypt()
Now that all users of lrw_crypt() have been removed in favor of the LRW template wrapping an ECB mode algorithm, remove lrw_crypt(). Also remove crypto/lrw.h as that is no longer needed either; and fold 'struct lrw_table_ctx' into 'struct priv', lrw_init_table() into setkey(), and lrw_free_table() into exit_tfm(). Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
parent
eb66ecd561
commit
217afccf65
|
@ -29,7 +29,6 @@
|
|||
#include <crypto/b128ops.h>
|
||||
#include <crypto/gf128mul.h>
|
||||
#include <crypto/internal/skcipher.h>
|
||||
#include <crypto/lrw.h>
|
||||
#include <crypto/xts.h>
|
||||
#include <asm/crypto/glue_helper.h>
|
||||
|
||||
|
|
152
crypto/lrw.c
152
crypto/lrw.c
|
@ -28,13 +28,31 @@
|
|||
|
||||
#include <crypto/b128ops.h>
|
||||
#include <crypto/gf128mul.h>
|
||||
#include <crypto/lrw.h>
|
||||
|
||||
#define LRW_BUFFER_SIZE 128u
|
||||
|
||||
#define LRW_BLOCK_SIZE 16
|
||||
|
||||
struct priv {
|
||||
struct crypto_skcipher *child;
|
||||
struct lrw_table_ctx table;
|
||||
|
||||
/*
|
||||
* 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];
|
||||
};
|
||||
|
||||
struct rctx {
|
||||
|
@ -65,11 +83,25 @@ static inline void setbit128_bbe(void *b, int bit)
|
|||
), b);
|
||||
}
|
||||
|
||||
int lrw_init_table(struct lrw_table_ctx *ctx, const u8 *tweak)
|
||||
static int setkey(struct crypto_skcipher *parent, const u8 *key,
|
||||
unsigned int keylen)
|
||||
{
|
||||
struct priv *ctx = crypto_skcipher_ctx(parent);
|
||||
struct crypto_skcipher *child = ctx->child;
|
||||
int err, bsize = LRW_BLOCK_SIZE;
|
||||
const u8 *tweak = key + keylen - bsize;
|
||||
be128 tmp = { 0 };
|
||||
int i;
|
||||
|
||||
crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
|
||||
crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) &
|
||||
CRYPTO_TFM_REQ_MASK);
|
||||
err = crypto_skcipher_setkey(child, key, keylen - bsize);
|
||||
crypto_skcipher_set_flags(parent, crypto_skcipher_get_flags(child) &
|
||||
CRYPTO_TFM_RES_MASK);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
if (ctx->table)
|
||||
gf128mul_free_64k(ctx->table);
|
||||
|
||||
|
@ -87,34 +119,6 @@ int lrw_init_table(struct lrw_table_ctx *ctx, const u8 *tweak)
|
|||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(lrw_init_table);
|
||||
|
||||
void lrw_free_table(struct lrw_table_ctx *ctx)
|
||||
{
|
||||
if (ctx->table)
|
||||
gf128mul_free_64k(ctx->table);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(lrw_free_table);
|
||||
|
||||
static int setkey(struct crypto_skcipher *parent, const u8 *key,
|
||||
unsigned int keylen)
|
||||
{
|
||||
struct priv *ctx = crypto_skcipher_ctx(parent);
|
||||
struct crypto_skcipher *child = ctx->child;
|
||||
int err, bsize = LRW_BLOCK_SIZE;
|
||||
const u8 *tweak = key + keylen - bsize;
|
||||
|
||||
crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
|
||||
crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) &
|
||||
CRYPTO_TFM_REQ_MASK);
|
||||
err = crypto_skcipher_setkey(child, key, keylen - bsize);
|
||||
crypto_skcipher_set_flags(parent, crypto_skcipher_get_flags(child) &
|
||||
CRYPTO_TFM_RES_MASK);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
return lrw_init_table(&ctx->table, tweak);
|
||||
}
|
||||
|
||||
static inline void inc(be128 *iv)
|
||||
{
|
||||
|
@ -238,7 +242,7 @@ static int pre_crypt(struct skcipher_request *req)
|
|||
/* T <- I*Key2, using the optimization
|
||||
* discussed in the specification */
|
||||
be128_xor(&rctx->t, &rctx->t,
|
||||
&ctx->table.mulinc[get_index128(iv)]);
|
||||
&ctx->mulinc[get_index128(iv)]);
|
||||
inc(iv);
|
||||
} while ((avail -= bs) >= bs);
|
||||
|
||||
|
@ -301,7 +305,7 @@ static int init_crypt(struct skcipher_request *req, crypto_completion_t done)
|
|||
memcpy(&rctx->t, req->iv, sizeof(rctx->t));
|
||||
|
||||
/* T <- I*Key2 */
|
||||
gf128mul_64k_bbe(&rctx->t, ctx->table.table);
|
||||
gf128mul_64k_bbe(&rctx->t, ctx->table);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
@ -416,85 +420,6 @@ static int decrypt(struct skcipher_request *req)
|
|||
return do_decrypt(req, init_crypt(req, decrypt_done));
|
||||
}
|
||||
|
||||
int lrw_crypt(struct blkcipher_desc *desc, struct scatterlist *sdst,
|
||||
struct scatterlist *ssrc, unsigned int nbytes,
|
||||
struct lrw_crypt_req *req)
|
||||
{
|
||||
const unsigned int bsize = LRW_BLOCK_SIZE;
|
||||
const unsigned int max_blks = req->tbuflen / bsize;
|
||||
struct lrw_table_ctx *ctx = req->table_ctx;
|
||||
struct blkcipher_walk walk;
|
||||
unsigned int nblocks;
|
||||
be128 *iv, *src, *dst, *t;
|
||||
be128 *t_buf = req->tbuf;
|
||||
int err, i;
|
||||
|
||||
BUG_ON(max_blks < 1);
|
||||
|
||||
blkcipher_walk_init(&walk, sdst, ssrc, nbytes);
|
||||
|
||||
err = blkcipher_walk_virt(desc, &walk);
|
||||
nbytes = walk.nbytes;
|
||||
if (!nbytes)
|
||||
return err;
|
||||
|
||||
nblocks = min(walk.nbytes / bsize, max_blks);
|
||||
src = (be128 *)walk.src.virt.addr;
|
||||
dst = (be128 *)walk.dst.virt.addr;
|
||||
|
||||
/* calculate first value of T */
|
||||
iv = (be128 *)walk.iv;
|
||||
t_buf[0] = *iv;
|
||||
|
||||
/* T <- I*Key2 */
|
||||
gf128mul_64k_bbe(&t_buf[0], ctx->table);
|
||||
|
||||
i = 0;
|
||||
goto first;
|
||||
|
||||
for (;;) {
|
||||
do {
|
||||
for (i = 0; i < nblocks; i++) {
|
||||
/* T <- I*Key2, using the optimization
|
||||
* discussed in the specification */
|
||||
be128_xor(&t_buf[i], t,
|
||||
&ctx->mulinc[get_index128(iv)]);
|
||||
inc(iv);
|
||||
first:
|
||||
t = &t_buf[i];
|
||||
|
||||
/* PP <- T xor P */
|
||||
be128_xor(dst + i, t, src + i);
|
||||
}
|
||||
|
||||
/* CC <- E(Key2,PP) */
|
||||
req->crypt_fn(req->crypt_ctx, (u8 *)dst,
|
||||
nblocks * bsize);
|
||||
|
||||
/* C <- T xor CC */
|
||||
for (i = 0; i < nblocks; i++)
|
||||
be128_xor(dst + i, dst + i, &t_buf[i]);
|
||||
|
||||
src += nblocks;
|
||||
dst += nblocks;
|
||||
nbytes -= nblocks * bsize;
|
||||
nblocks = min(nbytes / bsize, max_blks);
|
||||
} while (nblocks > 0);
|
||||
|
||||
err = blkcipher_walk_done(desc, &walk, nbytes);
|
||||
nbytes = walk.nbytes;
|
||||
if (!nbytes)
|
||||
break;
|
||||
|
||||
nblocks = min(nbytes / bsize, max_blks);
|
||||
src = (be128 *)walk.src.virt.addr;
|
||||
dst = (be128 *)walk.dst.virt.addr;
|
||||
}
|
||||
|
||||
return err;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(lrw_crypt);
|
||||
|
||||
static int init_tfm(struct crypto_skcipher *tfm)
|
||||
{
|
||||
struct skcipher_instance *inst = skcipher_alg_instance(tfm);
|
||||
|
@ -518,7 +443,8 @@ static void exit_tfm(struct crypto_skcipher *tfm)
|
|||
{
|
||||
struct priv *ctx = crypto_skcipher_ctx(tfm);
|
||||
|
||||
lrw_free_table(&ctx->table);
|
||||
if (ctx->table)
|
||||
gf128mul_free_64k(ctx->table);
|
||||
crypto_free_skcipher(ctx->child);
|
||||
}
|
||||
|
||||
|
|
|
@ -1,44 +0,0 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
#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 */
|
Loading…
Reference in a new issue