Commit 81559f9a authored by Jussi Kivilinna's avatar Jussi Kivilinna Committed by Herbert Xu

crypto: twofish-x86_64-3way - add lrw support

Patch adds LRW support for twofish-x86_64-3way by using lrw_crypt(). Patch has
been tested with tcrypt and automated filesystem tests.

Tcrypt benchmarks results (twofish-3way/twofish-asm speed ratios):

Intel Celeron T1600 (fam:6, model:15, step:13):

size	lrw-enc	lrw-dec
16B	0.99x	1.00x
64B	1.17x	1.17x
256B	1.26x	1.27x
1024B	1.30x	1.31x
8192B	1.31x	1.32x

AMD Phenom II 1055T (fam:16, model:10):

size	lrw-enc	lrw-dec
16B	1.06x	1.01x
64B	1.08x	1.14x
256B	1.19x	1.20x
1024B	1.21x	1.22x
8192B	1.23x	1.24x
Signed-off-by: default avatarJussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent bee3a90e
......@@ -32,6 +32,11 @@
#include <crypto/algapi.h>
#include <crypto/twofish.h>
#include <crypto/b128ops.h>
#include <crypto/lrw.h>
#if defined(CONFIG_CRYPTO_LRW) || defined(CONFIG_CRYPTO_LRW_MODULE)
#define HAS_LRW
#endif
/* regular block cipher functions from twofish_x86_64 module */
asmlinkage void twofish_enc_blk(struct twofish_ctx *ctx, u8 *dst,
......@@ -432,6 +437,124 @@ static struct crypto_alg blk_ctr_alg = {
},
};
#ifdef HAS_LRW
static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
{
const unsigned int bsize = TF_BLOCK_SIZE;
struct twofish_ctx *ctx = priv;
int i;
if (nbytes == 3 * bsize) {
twofish_enc_blk_3way(ctx, srcdst, srcdst);
return;
}
for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
twofish_enc_blk(ctx, srcdst, srcdst);
}
static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
{
const unsigned int bsize = TF_BLOCK_SIZE;
struct twofish_ctx *ctx = priv;
int i;
if (nbytes == 3 * bsize) {
twofish_dec_blk_3way(ctx, srcdst, srcdst);
return;
}
for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
twofish_dec_blk(ctx, srcdst, srcdst);
}
struct twofish_lrw_ctx {
struct lrw_table_ctx lrw_table;
struct twofish_ctx twofish_ctx;
};
static int lrw_twofish_setkey(struct crypto_tfm *tfm, const u8 *key,
unsigned int keylen)
{
struct twofish_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
int err;
err = __twofish_setkey(&ctx->twofish_ctx, key, keylen - TF_BLOCK_SIZE,
&tfm->crt_flags);
if (err)
return err;
return lrw_init_table(&ctx->lrw_table, key + keylen - TF_BLOCK_SIZE);
}
static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct twofish_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
be128 buf[3];
struct lrw_crypt_req req = {
.tbuf = buf,
.tbuflen = sizeof(buf),
.table_ctx = &ctx->lrw_table,
.crypt_ctx = &ctx->twofish_ctx,
.crypt_fn = encrypt_callback,
};
return lrw_crypt(desc, dst, src, nbytes, &req);
}
static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct twofish_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
be128 buf[3];
struct lrw_crypt_req req = {
.tbuf = buf,
.tbuflen = sizeof(buf),
.table_ctx = &ctx->lrw_table,
.crypt_ctx = &ctx->twofish_ctx,
.crypt_fn = decrypt_callback,
};
return lrw_crypt(desc, dst, src, nbytes, &req);
}
static void lrw_exit_tfm(struct crypto_tfm *tfm)
{
struct twofish_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
lrw_free_table(&ctx->lrw_table);
}
static struct crypto_alg blk_lrw_alg = {
.cra_name = "lrw(twofish)",
.cra_driver_name = "lrw-twofish-3way",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = TF_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct twofish_lrw_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(blk_lrw_alg.cra_list),
.cra_exit = lrw_exit_tfm,
.cra_u = {
.blkcipher = {
.min_keysize = TF_MIN_KEY_SIZE + TF_BLOCK_SIZE,
.max_keysize = TF_MAX_KEY_SIZE + TF_BLOCK_SIZE,
.ivsize = TF_BLOCK_SIZE,
.setkey = lrw_twofish_setkey,
.encrypt = lrw_encrypt,
.decrypt = lrw_decrypt,
},
},
};
#endif
int __init init(void)
{
int err;
......@@ -445,9 +568,18 @@ int __init init(void)
err = crypto_register_alg(&blk_ctr_alg);
if (err)
goto ctr_err;
#ifdef HAS_LRW
err = crypto_register_alg(&blk_lrw_alg);
if (err)
goto blk_lrw_err;
#endif
return 0;
#ifdef HAS_LRW
blk_lrw_err:
crypto_unregister_alg(&blk_ctr_alg);
#endif
ctr_err:
crypto_unregister_alg(&blk_cbc_alg);
cbc_err:
......@@ -458,6 +590,9 @@ int __init init(void)
void __exit fini(void)
{
#ifdef HAS_LRW
crypto_unregister_alg(&blk_lrw_alg);
#endif
crypto_unregister_alg(&blk_ctr_alg);
crypto_unregister_alg(&blk_cbc_alg);
crypto_unregister_alg(&blk_ecb_alg);
......
......@@ -580,12 +580,9 @@ static const u8 calc_sb_tbl[512] = {
ctx->a[(j) + 1] = rol32(y, 9)
/* Perform the key setup. */
int twofish_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int key_len)
int __twofish_setkey(struct twofish_ctx *ctx, const u8 *key,
unsigned int key_len, u32 *flags)
{
struct twofish_ctx *ctx = crypto_tfm_ctx(tfm);
u32 *flags = &tfm->crt_flags;
int i, j, k;
/* Temporaries for CALC_K. */
......@@ -701,7 +698,13 @@ int twofish_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int key_len)
return 0;
}
EXPORT_SYMBOL_GPL(__twofish_setkey);
int twofish_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int key_len)
{
return __twofish_setkey(crypto_tfm_ctx(tfm), key, key_len,
&tfm->crt_flags);
}
EXPORT_SYMBOL_GPL(twofish_setkey);
MODULE_LICENSE("GPL");
......
......@@ -17,6 +17,8 @@ struct twofish_ctx {
u32 s[4][256], w[8], k[32];
};
int __twofish_setkey(struct twofish_ctx *ctx, const u8 *key,
unsigned int key_len, u32 *flags);
int twofish_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int key_len);
#endif
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