500 строки
13 KiB
C
500 строки
13 KiB
C
/*
|
|
* Glue Code for 3-way parallel assembler optimized version of Twofish
|
|
*
|
|
* Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
|
|
* USA
|
|
*
|
|
*/
|
|
|
|
#include <asm/processor.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <crypto/algapi.h>
|
|
#include <crypto/twofish.h>
|
|
#include <crypto/b128ops.h>
|
|
#include <asm/crypto/twofish.h>
|
|
#include <asm/crypto/glue_helper.h>
|
|
#include <crypto/lrw.h>
|
|
#include <crypto/xts.h>
|
|
|
|
EXPORT_SYMBOL_GPL(__twofish_enc_blk_3way);
|
|
EXPORT_SYMBOL_GPL(twofish_dec_blk_3way);
|
|
|
|
static inline void twofish_enc_blk_3way(struct twofish_ctx *ctx, u8 *dst,
|
|
const u8 *src)
|
|
{
|
|
__twofish_enc_blk_3way(ctx, dst, src, false);
|
|
}
|
|
|
|
static inline void twofish_enc_blk_xor_3way(struct twofish_ctx *ctx, u8 *dst,
|
|
const u8 *src)
|
|
{
|
|
__twofish_enc_blk_3way(ctx, dst, src, true);
|
|
}
|
|
|
|
void twofish_dec_blk_cbc_3way(void *ctx, u128 *dst, const u128 *src)
|
|
{
|
|
u128 ivs[2];
|
|
|
|
ivs[0] = src[0];
|
|
ivs[1] = src[1];
|
|
|
|
twofish_dec_blk_3way(ctx, (u8 *)dst, (u8 *)src);
|
|
|
|
u128_xor(&dst[1], &dst[1], &ivs[0]);
|
|
u128_xor(&dst[2], &dst[2], &ivs[1]);
|
|
}
|
|
EXPORT_SYMBOL_GPL(twofish_dec_blk_cbc_3way);
|
|
|
|
void twofish_enc_blk_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
|
|
{
|
|
be128 ctrblk;
|
|
|
|
if (dst != src)
|
|
*dst = *src;
|
|
|
|
le128_to_be128(&ctrblk, iv);
|
|
le128_inc(iv);
|
|
|
|
twofish_enc_blk(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
|
|
u128_xor(dst, dst, (u128 *)&ctrblk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(twofish_enc_blk_ctr);
|
|
|
|
void twofish_enc_blk_ctr_3way(void *ctx, u128 *dst, const u128 *src,
|
|
le128 *iv)
|
|
{
|
|
be128 ctrblks[3];
|
|
|
|
if (dst != src) {
|
|
dst[0] = src[0];
|
|
dst[1] = src[1];
|
|
dst[2] = src[2];
|
|
}
|
|
|
|
le128_to_be128(&ctrblks[0], iv);
|
|
le128_inc(iv);
|
|
le128_to_be128(&ctrblks[1], iv);
|
|
le128_inc(iv);
|
|
le128_to_be128(&ctrblks[2], iv);
|
|
le128_inc(iv);
|
|
|
|
twofish_enc_blk_xor_3way(ctx, (u8 *)dst, (u8 *)ctrblks);
|
|
}
|
|
EXPORT_SYMBOL_GPL(twofish_enc_blk_ctr_3way);
|
|
|
|
static const struct common_glue_ctx twofish_enc = {
|
|
.num_funcs = 2,
|
|
.fpu_blocks_limit = -1,
|
|
|
|
.funcs = { {
|
|
.num_blocks = 3,
|
|
.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk_3way) }
|
|
}, {
|
|
.num_blocks = 1,
|
|
.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk) }
|
|
} }
|
|
};
|
|
|
|
static const struct common_glue_ctx twofish_ctr = {
|
|
.num_funcs = 2,
|
|
.fpu_blocks_limit = -1,
|
|
|
|
.funcs = { {
|
|
.num_blocks = 3,
|
|
.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk_ctr_3way) }
|
|
}, {
|
|
.num_blocks = 1,
|
|
.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk_ctr) }
|
|
} }
|
|
};
|
|
|
|
static const struct common_glue_ctx twofish_dec = {
|
|
.num_funcs = 2,
|
|
.fpu_blocks_limit = -1,
|
|
|
|
.funcs = { {
|
|
.num_blocks = 3,
|
|
.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_dec_blk_3way) }
|
|
}, {
|
|
.num_blocks = 1,
|
|
.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_dec_blk) }
|
|
} }
|
|
};
|
|
|
|
static const struct common_glue_ctx twofish_dec_cbc = {
|
|
.num_funcs = 2,
|
|
.fpu_blocks_limit = -1,
|
|
|
|
.funcs = { {
|
|
.num_blocks = 3,
|
|
.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_dec_blk_cbc_3way) }
|
|
}, {
|
|
.num_blocks = 1,
|
|
.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_dec_blk) }
|
|
} }
|
|
};
|
|
|
|
static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
|
struct scatterlist *src, unsigned int nbytes)
|
|
{
|
|
return glue_ecb_crypt_128bit(&twofish_enc, desc, dst, src, nbytes);
|
|
}
|
|
|
|
static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
|
struct scatterlist *src, unsigned int nbytes)
|
|
{
|
|
return glue_ecb_crypt_128bit(&twofish_dec, desc, dst, src, nbytes);
|
|
}
|
|
|
|
static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
|
struct scatterlist *src, unsigned int nbytes)
|
|
{
|
|
return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(twofish_enc_blk), desc,
|
|
dst, src, nbytes);
|
|
}
|
|
|
|
static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
|
struct scatterlist *src, unsigned int nbytes)
|
|
{
|
|
return glue_cbc_decrypt_128bit(&twofish_dec_cbc, desc, dst, src,
|
|
nbytes);
|
|
}
|
|
|
|
static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
|
struct scatterlist *src, unsigned int nbytes)
|
|
{
|
|
return glue_ctr_crypt_128bit(&twofish_ctr, desc, dst, src, nbytes);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
EXPORT_SYMBOL_GPL(lrw_twofish_setkey);
|
|
|
|
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);
|
|
}
|
|
|
|
void lrw_twofish_exit_tfm(struct crypto_tfm *tfm)
|
|
{
|
|
struct twofish_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
lrw_free_table(&ctx->lrw_table);
|
|
}
|
|
EXPORT_SYMBOL_GPL(lrw_twofish_exit_tfm);
|
|
|
|
int xts_twofish_setkey(struct crypto_tfm *tfm, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct twofish_xts_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
u32 *flags = &tfm->crt_flags;
|
|
int err;
|
|
|
|
/* key consists of keys of equal size concatenated, therefore
|
|
* the length must be even
|
|
*/
|
|
if (keylen % 2) {
|
|
*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* first half of xts-key is for crypt */
|
|
err = __twofish_setkey(&ctx->crypt_ctx, key, keylen / 2, flags);
|
|
if (err)
|
|
return err;
|
|
|
|
/* second half of xts-key is for tweak */
|
|
return __twofish_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2,
|
|
flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xts_twofish_setkey);
|
|
|
|
static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
|
struct scatterlist *src, unsigned int nbytes)
|
|
{
|
|
struct twofish_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
|
|
be128 buf[3];
|
|
struct xts_crypt_req req = {
|
|
.tbuf = buf,
|
|
.tbuflen = sizeof(buf),
|
|
|
|
.tweak_ctx = &ctx->tweak_ctx,
|
|
.tweak_fn = XTS_TWEAK_CAST(twofish_enc_blk),
|
|
.crypt_ctx = &ctx->crypt_ctx,
|
|
.crypt_fn = encrypt_callback,
|
|
};
|
|
|
|
return xts_crypt(desc, dst, src, nbytes, &req);
|
|
}
|
|
|
|
static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
|
struct scatterlist *src, unsigned int nbytes)
|
|
{
|
|
struct twofish_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
|
|
be128 buf[3];
|
|
struct xts_crypt_req req = {
|
|
.tbuf = buf,
|
|
.tbuflen = sizeof(buf),
|
|
|
|
.tweak_ctx = &ctx->tweak_ctx,
|
|
.tweak_fn = XTS_TWEAK_CAST(twofish_enc_blk),
|
|
.crypt_ctx = &ctx->crypt_ctx,
|
|
.crypt_fn = decrypt_callback,
|
|
};
|
|
|
|
return xts_crypt(desc, dst, src, nbytes, &req);
|
|
}
|
|
|
|
static struct crypto_alg tf_algs[5] = { {
|
|
.cra_name = "ecb(twofish)",
|
|
.cra_driver_name = "ecb-twofish-3way",
|
|
.cra_priority = 300,
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
|
|
.cra_blocksize = TF_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct twofish_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_u = {
|
|
.blkcipher = {
|
|
.min_keysize = TF_MIN_KEY_SIZE,
|
|
.max_keysize = TF_MAX_KEY_SIZE,
|
|
.setkey = twofish_setkey,
|
|
.encrypt = ecb_encrypt,
|
|
.decrypt = ecb_decrypt,
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "cbc(twofish)",
|
|
.cra_driver_name = "cbc-twofish-3way",
|
|
.cra_priority = 300,
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
|
|
.cra_blocksize = TF_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct twofish_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_u = {
|
|
.blkcipher = {
|
|
.min_keysize = TF_MIN_KEY_SIZE,
|
|
.max_keysize = TF_MAX_KEY_SIZE,
|
|
.ivsize = TF_BLOCK_SIZE,
|
|
.setkey = twofish_setkey,
|
|
.encrypt = cbc_encrypt,
|
|
.decrypt = cbc_decrypt,
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "ctr(twofish)",
|
|
.cra_driver_name = "ctr-twofish-3way",
|
|
.cra_priority = 300,
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
|
|
.cra_blocksize = 1,
|
|
.cra_ctxsize = sizeof(struct twofish_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_u = {
|
|
.blkcipher = {
|
|
.min_keysize = TF_MIN_KEY_SIZE,
|
|
.max_keysize = TF_MAX_KEY_SIZE,
|
|
.ivsize = TF_BLOCK_SIZE,
|
|
.setkey = twofish_setkey,
|
|
.encrypt = ctr_crypt,
|
|
.decrypt = ctr_crypt,
|
|
},
|
|
},
|
|
}, {
|
|
.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_exit = lrw_twofish_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,
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "xts(twofish)",
|
|
.cra_driver_name = "xts-twofish-3way",
|
|
.cra_priority = 300,
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
|
|
.cra_blocksize = TF_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct twofish_xts_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_u = {
|
|
.blkcipher = {
|
|
.min_keysize = TF_MIN_KEY_SIZE * 2,
|
|
.max_keysize = TF_MAX_KEY_SIZE * 2,
|
|
.ivsize = TF_BLOCK_SIZE,
|
|
.setkey = xts_twofish_setkey,
|
|
.encrypt = xts_encrypt,
|
|
.decrypt = xts_decrypt,
|
|
},
|
|
},
|
|
} };
|
|
|
|
static bool is_blacklisted_cpu(void)
|
|
{
|
|
if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
|
|
return false;
|
|
|
|
if (boot_cpu_data.x86 == 0x06 &&
|
|
(boot_cpu_data.x86_model == 0x1c ||
|
|
boot_cpu_data.x86_model == 0x26 ||
|
|
boot_cpu_data.x86_model == 0x36)) {
|
|
/*
|
|
* On Atom, twofish-3way is slower than original assembler
|
|
* implementation. Twofish-3way trades off some performance in
|
|
* storing blocks in 64bit registers to allow three blocks to
|
|
* be processed parallel. Parallel operation then allows gaining
|
|
* more performance than was trade off, on out-of-order CPUs.
|
|
* However Atom does not benefit from this parallellism and
|
|
* should be blacklisted.
|
|
*/
|
|
return true;
|
|
}
|
|
|
|
if (boot_cpu_data.x86 == 0x0f) {
|
|
/*
|
|
* On Pentium 4, twofish-3way is slower than original assembler
|
|
* implementation because excessive uses of 64bit rotate and
|
|
* left-shifts (which are really slow on P4) needed to store and
|
|
* handle 128bit block in two 64bit registers.
|
|
*/
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static int force;
|
|
module_param(force, int, 0);
|
|
MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
|
|
|
|
static int __init init(void)
|
|
{
|
|
if (!force && is_blacklisted_cpu()) {
|
|
printk(KERN_INFO
|
|
"twofish-x86_64-3way: performance on this CPU "
|
|
"would be suboptimal: disabling "
|
|
"twofish-x86_64-3way.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
return crypto_register_algs(tf_algs, ARRAY_SIZE(tf_algs));
|
|
}
|
|
|
|
static void __exit fini(void)
|
|
{
|
|
crypto_unregister_algs(tf_algs, ARRAY_SIZE(tf_algs));
|
|
}
|
|
|
|
module_init(init);
|
|
module_exit(fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Twofish Cipher Algorithm, 3-way parallel asm optimized");
|
|
MODULE_ALIAS("twofish");
|
|
MODULE_ALIAS("twofish-asm");
|