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linux/arch/x86/crypto/twofish_avx2_glue.c
Jussi Kivilinna cf1521a1a5 crypto: twofish - add AVX2/x86_64 assembler implementation of twofish cipher 
Patch adds AVX2/x86-64 implementation of Twofish cipher, requiring 16 parallel
blocks for input (256 bytes). Table look-ups are performed using vpgatherdd
instruction directly from vector registers and thus should be faster than
earlier implementations. Implementation also uses 256-bit wide YMM registers,
which should give additional speed up compared to the AVX implementation.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2013-04-25 21:09:05 +08:00

585 lines
15 KiB
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/*
* Glue Code for x86_64/AVX2 assembler optimized version of Twofish
*
* Copyright © 2012-2013 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.
*
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <crypto/algapi.h>
#include <crypto/ctr.h>
#include <crypto/twofish.h>
#include <crypto/lrw.h>
#include <crypto/xts.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>
#define TF_AVX2_PARALLEL_BLOCKS 16
/* 16-way AVX2 parallel cipher functions */
asmlinkage void twofish_ecb_enc_16way(struct twofish_ctx *ctx, u8 *dst,
const u8 *src);
asmlinkage void twofish_ecb_dec_16way(struct twofish_ctx *ctx, u8 *dst,
const u8 *src);
asmlinkage void twofish_cbc_dec_16way(void *ctx, u128 *dst, const u128 *src);
asmlinkage void twofish_ctr_16way(void *ctx, u128 *dst, const u128 *src,
le128 *iv);
asmlinkage void twofish_xts_enc_16way(struct twofish_ctx *ctx, u8 *dst,
const u8 *src, le128 *iv);
asmlinkage void twofish_xts_dec_16way(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 = 4,
.fpu_blocks_limit = 8,
.funcs = { {
.num_blocks = 16,
.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_ecb_enc_16way) }
}, {
.num_blocks = 8,
.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 = 4,
.fpu_blocks_limit = 8,
.funcs = { {
.num_blocks = 16,
.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(twofish_ctr_16way) }
}, {
.num_blocks = 8,
.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_enc_xts = {
.num_funcs = 3,
.fpu_blocks_limit = 8,
.funcs = { {
.num_blocks = 16,
.fn_u = { .xts = GLUE_XTS_FUNC_CAST(twofish_xts_enc_16way) }
}, {
.num_blocks = 8,
.fn_u = { .xts = GLUE_XTS_FUNC_CAST(twofish_xts_enc_8way) }
}, {
.num_blocks = 1,
.fn_u = { .xts = GLUE_XTS_FUNC_CAST(twofish_xts_enc) }
} }
};
static const struct common_glue_ctx twofish_dec = {
.num_funcs = 4,
.fpu_blocks_limit = 8,
.funcs = { {
.num_blocks = 16,
.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_ecb_dec_16way) }
}, {
.num_blocks = 8,
.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 = 4,
.fpu_blocks_limit = 8,
.funcs = { {
.num_blocks = 16,
.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_cbc_dec_16way) }
}, {
.num_blocks = 8,
.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 const struct common_glue_ctx twofish_dec_xts = {
.num_funcs = 3,
.fpu_blocks_limit = 8,
.funcs = { {
.num_blocks = 16,
.fn_u = { .xts = GLUE_XTS_FUNC_CAST(twofish_xts_dec_16way) }
}, {
.num_blocks = 8,
.fn_u = { .xts = GLUE_XTS_FUNC_CAST(twofish_xts_dec_8way) }
}, {
.num_blocks = 1,
.fn_u = { .xts = GLUE_XTS_FUNC_CAST(twofish_xts_dec) }
} }
};
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)
{
/* since reusing AVX functions, starts using FPU at 8 parallel blocks */
return glue_fpu_begin(TF_BLOCK_SIZE, 8, 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);
while (nbytes >= TF_AVX2_PARALLEL_BLOCKS * bsize) {
twofish_ecb_enc_16way(ctx->ctx, srcdst, srcdst);
srcdst += bsize * TF_AVX2_PARALLEL_BLOCKS;
nbytes -= bsize * TF_AVX2_PARALLEL_BLOCKS;
}
while (nbytes >= 8 * bsize) {
twofish_ecb_enc_8way(ctx->ctx, srcdst, srcdst);
srcdst += bsize * 8;
nbytes -= bsize * 8;
}
while (nbytes >= 3 * bsize) {
twofish_enc_blk_3way(ctx->ctx, srcdst, srcdst);
srcdst += bsize * 3;
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);
while (nbytes >= TF_AVX2_PARALLEL_BLOCKS * bsize) {
twofish_ecb_dec_16way(ctx->ctx, srcdst, srcdst);
srcdst += bsize * TF_AVX2_PARALLEL_BLOCKS;
nbytes -= bsize * TF_AVX2_PARALLEL_BLOCKS;
}
while (nbytes >= 8 * bsize) {
twofish_ecb_dec_8way(ctx->ctx, srcdst, srcdst);
srcdst += bsize * 8;
nbytes -= bsize * 8;
}
while (nbytes >= 3 * bsize) {
twofish_dec_blk_3way(ctx->ctx, srcdst, srcdst);
srcdst += bsize * 3;
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[TF_AVX2_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[TF_AVX2_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);
return glue_xts_crypt_128bit(&twofish_enc_xts, desc, dst, src, nbytes,
XTS_TWEAK_CAST(twofish_enc_blk),
&ctx->tweak_ctx, &ctx->crypt_ctx);
}
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);
return glue_xts_crypt_128bit(&twofish_dec_xts, desc, dst, src, nbytes,
XTS_TWEAK_CAST(twofish_enc_blk),
&ctx->tweak_ctx, &ctx->crypt_ctx);
}
static struct crypto_alg tf_algs[10] = { {
.cra_name = "__ecb-twofish-avx2",
.cra_driver_name = "__driver-ecb-twofish-avx2",
.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-avx2",
.cra_driver_name = "__driver-cbc-twofish-avx2",
.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-avx2",
.cra_driver_name = "__driver-ctr-twofish-avx2",
.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-avx2",
.cra_driver_name = "__driver-lrw-twofish-avx2",
.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-avx2",
.cra_driver_name = "__driver-xts-twofish-avx2",
.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-avx2",
.cra_priority = 500,
.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-avx2",
.cra_priority = 500,
.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-avx2",
.cra_priority = 500,
.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-avx2",
.cra_priority = 500,
.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-avx2",
.cra_priority = 500,
.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 init(void)
{
u64 xcr0;
if (!cpu_has_avx2 || !cpu_has_osxsave) {
pr_info("AVX2 instructions are not detected.\n");
return -ENODEV;
}
xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
pr_info("AVX2 detected but unusable.\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, AVX2 optimized");
MODULE_ALIAS("twofish");
MODULE_ALIAS("twofish-asm");
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