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linux-next/arch/x86/crypto/twofish_avx_glue.c
Jussi Kivilinna 8435a3c300 crypto: twofish/avx - avoid using temporary stack buffers 
Introduce new assembler functions to avoid use temporary stack buffers in glue
code. This also allows use of vector instructions for xoring output in CTR and
CBC modes and construction of IVs for CTR mode.

ECB mode sees ~0.2% decrease in speed because added one extra function
call. CBC mode decryption and CTR mode benefit from vector operations
and gain ~3%.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2012-10-24 21:10:55 +08:00

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/*
* Glue Code for AVX assembler version of Twofish Cipher
*
* Copyright (C) 2012 Johannes Goetzfried
* <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
*
* 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 <linux/module.h>
#include <linux/hardirq.h>
#include <linux/types.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <crypto/algapi.h>
#include <crypto/twofish.h>
#include <crypto/cryptd.h>
#include <crypto/b128ops.h>
#include <crypto/ctr.h>
#include <crypto/lrw.h>
#include <crypto/xts.h>
#include <asm/i387.h>
#include <asm/xcr.h>
#include <asm/xsave.h>
#include <asm/crypto/twofish.h>
#include <asm/crypto/ablk_helper.h>
#include <asm/crypto/glue_helper.h>
#include <crypto/scatterwalk.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>
#define TWOFISH_PARALLEL_BLOCKS 8
/* 8-way parallel cipher functions */
asmlinkage void twofish_ecb_enc_8way(struct twofish_ctx *ctx, u8 *dst,
const u8 *src);
asmlinkage void twofish_ecb_dec_8way(struct twofish_ctx *ctx, u8 *dst,
const u8 *src);
asmlinkage void twofish_cbc_dec_8way(struct twofish_ctx *ctx, u8 *dst,
const u8 *src);
asmlinkage void twofish_ctr_8way(struct twofish_ctx *ctx, u8 *dst,
const u8 *src, le128 *iv);
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 const struct common_glue_ctx twofish_enc = {
.num_funcs = 3,
.fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = TWOFISH_PARALLEL_BLOCKS,
.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_ecb_enc_8way) }
}, {
.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 = 3,
.fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = TWOFISH_PARALLEL_BLOCKS,
.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(twofish_ctr_8way) }
}, {
.num_blocks = 3,
.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(twofish_enc_blk_ctr_3way) }
}, {
.num_blocks = 1,
.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(twofish_enc_blk_ctr) }
} }
};
static const struct common_glue_ctx twofish_dec = {
.num_funcs = 3,
.fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = TWOFISH_PARALLEL_BLOCKS,
.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_ecb_dec_8way) }
}, {
.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 = 3,
.fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS,
.funcs = { {
.num_blocks = TWOFISH_PARALLEL_BLOCKS,
.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_cbc_dec_8way) }
}, {
.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 inline bool twofish_fpu_begin(bool fpu_enabled, unsigned int nbytes)
{
return glue_fpu_begin(TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS, NULL,
fpu_enabled, nbytes);
}
static inline void twofish_fpu_end(bool fpu_enabled)
{
glue_fpu_end(fpu_enabled);
}
struct crypt_priv {
struct twofish_ctx *ctx;
bool fpu_enabled;
};
static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
{
const unsigned int bsize = TF_BLOCK_SIZE;
struct crypt_priv *ctx = priv;
int i;
ctx->fpu_enabled = twofish_fpu_begin(ctx->fpu_enabled, nbytes);
if (nbytes == bsize * TWOFISH_PARALLEL_BLOCKS) {
twofish_ecb_enc_8way(ctx->ctx, srcdst, srcdst);
return;
}
for (i = 0; i < nbytes / (bsize * 3); i++, srcdst += bsize * 3)
twofish_enc_blk_3way(ctx->ctx, srcdst, srcdst);
nbytes %= bsize * 3;
for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
twofish_enc_blk(ctx->ctx, srcdst, srcdst);
}
static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
{
const unsigned int bsize = TF_BLOCK_SIZE;
struct crypt_priv *ctx = priv;
int i;
ctx->fpu_enabled = twofish_fpu_begin(ctx->fpu_enabled, nbytes);
if (nbytes == bsize * TWOFISH_PARALLEL_BLOCKS) {
twofish_ecb_dec_8way(ctx->ctx, srcdst, srcdst);
return;
}
for (i = 0; i < nbytes / (bsize * 3); i++, srcdst += bsize * 3)
twofish_dec_blk_3way(ctx->ctx, srcdst, srcdst);
nbytes %= bsize * 3;
for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
twofish_dec_blk(ctx->ctx, srcdst, srcdst);
}
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[TWOFISH_PARALLEL_BLOCKS];
struct crypt_priv crypt_ctx = {
.ctx = &ctx->twofish_ctx,
.fpu_enabled = false,
};
struct lrw_crypt_req req = {
.tbuf = buf,
.tbuflen = sizeof(buf),
.table_ctx = &ctx->lrw_table,
.crypt_ctx = &crypt_ctx,
.crypt_fn = encrypt_callback,
};
int ret;
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
ret = lrw_crypt(desc, dst, src, nbytes, &req);
twofish_fpu_end(crypt_ctx.fpu_enabled);
return ret;
}
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[TWOFISH_PARALLEL_BLOCKS];
struct crypt_priv crypt_ctx = {
.ctx = &ctx->twofish_ctx,
.fpu_enabled = false,
};
struct lrw_crypt_req req = {
.tbuf = buf,
.tbuflen = sizeof(buf),
.table_ctx = &ctx->lrw_table,
.crypt_ctx = &crypt_ctx,
.crypt_fn = decrypt_callback,
};
int ret;
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
ret = lrw_crypt(desc, dst, src, nbytes, &req);
twofish_fpu_end(crypt_ctx.fpu_enabled);
return ret;
}
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[TWOFISH_PARALLEL_BLOCKS];
struct crypt_priv crypt_ctx = {
.ctx = &ctx->crypt_ctx,
.fpu_enabled = false,
};
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 = &crypt_ctx,
.crypt_fn = encrypt_callback,
};
int ret;
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
ret = xts_crypt(desc, dst, src, nbytes, &req);
twofish_fpu_end(crypt_ctx.fpu_enabled);
return ret;
}
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[TWOFISH_PARALLEL_BLOCKS];
struct crypt_priv crypt_ctx = {
.ctx = &ctx->crypt_ctx,
.fpu_enabled = false,
};
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 = &crypt_ctx,
.crypt_fn = decrypt_callback,
};
int ret;
desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
ret = xts_crypt(desc, dst, src, nbytes, &req);
twofish_fpu_end(crypt_ctx.fpu_enabled);
return ret;
}
static struct crypto_alg twofish_algs[10] = { {
.cra_name = "__ecb-twofish-avx",
.cra_driver_name = "__driver-ecb-twofish-avx",
.cra_priority = 0,
.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-avx",
.cra_driver_name = "__driver-cbc-twofish-avx",
.cra_priority = 0,
.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 = cbc_encrypt,
.decrypt = cbc_decrypt,
},
},
}, {
.cra_name = "__ctr-twofish-avx",
.cra_driver_name = "__driver-ctr-twofish-avx",
.cra_priority = 0,
.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-avx",
.cra_driver_name = "__driver-lrw-twofish-avx",
.cra_priority = 0,
.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-avx",
.cra_driver_name = "__driver-xts-twofish-avx",
.cra_priority = 0,
.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,
},
},
}, {
.cra_name = "ecb(twofish)",
.cra_driver_name = "ecb-twofish-avx",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = TF_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct async_helper_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = ablk_init,
.cra_exit = ablk_exit,
.cra_u = {
.ablkcipher = {
.min_keysize = TF_MIN_KEY_SIZE,
.max_keysize = TF_MAX_KEY_SIZE,
.setkey = ablk_set_key,
.encrypt = ablk_encrypt,
.decrypt = ablk_decrypt,
},
},
}, {
.cra_name = "cbc(twofish)",
.cra_driver_name = "cbc-twofish-avx",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = TF_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct async_helper_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = ablk_init,
.cra_exit = ablk_exit,
.cra_u = {
.ablkcipher = {
.min_keysize = TF_MIN_KEY_SIZE,
.max_keysize = TF_MAX_KEY_SIZE,
.ivsize = TF_BLOCK_SIZE,
.setkey = ablk_set_key,
.encrypt = __ablk_encrypt,
.decrypt = ablk_decrypt,
},
},
}, {
.cra_name = "ctr(twofish)",
.cra_driver_name = "ctr-twofish-avx",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct async_helper_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = ablk_init,
.cra_exit = ablk_exit,
.cra_u = {
.ablkcipher = {
.min_keysize = TF_MIN_KEY_SIZE,
.max_keysize = TF_MAX_KEY_SIZE,
.ivsize = TF_BLOCK_SIZE,
.setkey = ablk_set_key,
.encrypt = ablk_encrypt,
.decrypt = ablk_encrypt,
.geniv = "chainiv",
},
},
}, {
.cra_name = "lrw(twofish)",
.cra_driver_name = "lrw-twofish-avx",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = TF_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct async_helper_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = ablk_init,
.cra_exit = ablk_exit,
.cra_u = {
.ablkcipher = {
.min_keysize = TF_MIN_KEY_SIZE +
TF_BLOCK_SIZE,
.max_keysize = TF_MAX_KEY_SIZE +
TF_BLOCK_SIZE,
.ivsize = TF_BLOCK_SIZE,
.setkey = ablk_set_key,
.encrypt = ablk_encrypt,
.decrypt = ablk_decrypt,
},
},
}, {
.cra_name = "xts(twofish)",
.cra_driver_name = "xts-twofish-avx",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = TF_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct async_helper_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = ablk_init,
.cra_exit = ablk_exit,
.cra_u = {
.ablkcipher = {
.min_keysize = TF_MIN_KEY_SIZE * 2,
.max_keysize = TF_MAX_KEY_SIZE * 2,
.ivsize = TF_BLOCK_SIZE,
.setkey = ablk_set_key,
.encrypt = ablk_encrypt,
.decrypt = ablk_decrypt,
},
},
} };
static int __init twofish_init(void)
{
u64 xcr0;
if (!cpu_has_avx || !cpu_has_osxsave) {
printk(KERN_INFO "AVX instructions are not detected.\n");
return -ENODEV;
}
xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
printk(KERN_INFO "AVX detected but unusable.\n");
return -ENODEV;
}
return crypto_register_algs(twofish_algs, ARRAY_SIZE(twofish_algs));
}
static void __exit twofish_exit(void)
{
crypto_unregister_algs(twofish_algs, ARRAY_SIZE(twofish_algs));
}
module_init(twofish_init);
module_exit(twofish_exit);
MODULE_DESCRIPTION("Twofish Cipher Algorithm, AVX optimized");
MODULE_LICENSE("GPL");
MODULE_ALIAS("twofish");
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