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37992fa47f
Convert the 3-way implementation of Twofish from the (deprecated) blkcipher interface over to the skcipher interface. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
291 lines
7.4 KiB
C
291 lines
7.4 KiB
C
/*
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* Glue Code for 3-way parallel assembler optimized version of Twofish
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*
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* Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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*/
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#include <asm/crypto/glue_helper.h>
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#include <asm/crypto/twofish.h>
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#include <crypto/algapi.h>
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#include <crypto/b128ops.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/twofish.h>
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#include <linux/crypto.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/types.h>
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EXPORT_SYMBOL_GPL(__twofish_enc_blk_3way);
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EXPORT_SYMBOL_GPL(twofish_dec_blk_3way);
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static int twofish_setkey_skcipher(struct crypto_skcipher *tfm,
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const u8 *key, unsigned int keylen)
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{
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return twofish_setkey(&tfm->base, key, keylen);
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}
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static inline void twofish_enc_blk_3way(struct twofish_ctx *ctx, u8 *dst,
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const u8 *src)
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{
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__twofish_enc_blk_3way(ctx, dst, src, false);
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}
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static inline void twofish_enc_blk_xor_3way(struct twofish_ctx *ctx, u8 *dst,
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const u8 *src)
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{
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__twofish_enc_blk_3way(ctx, dst, src, true);
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}
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void twofish_dec_blk_cbc_3way(void *ctx, u128 *dst, const u128 *src)
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{
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u128 ivs[2];
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ivs[0] = src[0];
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ivs[1] = src[1];
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twofish_dec_blk_3way(ctx, (u8 *)dst, (u8 *)src);
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u128_xor(&dst[1], &dst[1], &ivs[0]);
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u128_xor(&dst[2], &dst[2], &ivs[1]);
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}
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EXPORT_SYMBOL_GPL(twofish_dec_blk_cbc_3way);
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void twofish_enc_blk_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
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{
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be128 ctrblk;
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if (dst != src)
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*dst = *src;
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le128_to_be128(&ctrblk, iv);
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le128_inc(iv);
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twofish_enc_blk(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
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u128_xor(dst, dst, (u128 *)&ctrblk);
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}
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EXPORT_SYMBOL_GPL(twofish_enc_blk_ctr);
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void twofish_enc_blk_ctr_3way(void *ctx, u128 *dst, const u128 *src,
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le128 *iv)
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{
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be128 ctrblks[3];
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if (dst != src) {
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dst[0] = src[0];
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dst[1] = src[1];
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dst[2] = src[2];
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}
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le128_to_be128(&ctrblks[0], iv);
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le128_inc(iv);
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le128_to_be128(&ctrblks[1], iv);
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le128_inc(iv);
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le128_to_be128(&ctrblks[2], iv);
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le128_inc(iv);
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twofish_enc_blk_xor_3way(ctx, (u8 *)dst, (u8 *)ctrblks);
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}
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EXPORT_SYMBOL_GPL(twofish_enc_blk_ctr_3way);
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static const struct common_glue_ctx twofish_enc = {
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.num_funcs = 2,
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.fpu_blocks_limit = -1,
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.funcs = { {
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.num_blocks = 3,
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.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk_3way) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk) }
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} }
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};
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static const struct common_glue_ctx twofish_ctr = {
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.num_funcs = 2,
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.fpu_blocks_limit = -1,
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.funcs = { {
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.num_blocks = 3,
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.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk_ctr_3way) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk_ctr) }
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} }
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};
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static const struct common_glue_ctx twofish_dec = {
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.num_funcs = 2,
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.fpu_blocks_limit = -1,
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.funcs = { {
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.num_blocks = 3,
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.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_dec_blk_3way) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ecb = GLUE_FUNC_CAST(twofish_dec_blk) }
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} }
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};
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static const struct common_glue_ctx twofish_dec_cbc = {
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.num_funcs = 2,
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.fpu_blocks_limit = -1,
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.funcs = { {
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.num_blocks = 3,
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.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_dec_blk_cbc_3way) }
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}, {
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.num_blocks = 1,
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.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_dec_blk) }
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} }
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};
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static int ecb_encrypt(struct skcipher_request *req)
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{
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return glue_ecb_req_128bit(&twofish_enc, req);
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}
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static int ecb_decrypt(struct skcipher_request *req)
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{
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return glue_ecb_req_128bit(&twofish_dec, req);
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}
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static int cbc_encrypt(struct skcipher_request *req)
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{
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return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(twofish_enc_blk),
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req);
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}
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static int cbc_decrypt(struct skcipher_request *req)
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{
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return glue_cbc_decrypt_req_128bit(&twofish_dec_cbc, req);
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}
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static int ctr_crypt(struct skcipher_request *req)
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{
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return glue_ctr_req_128bit(&twofish_ctr, req);
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}
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static struct skcipher_alg tf_skciphers[] = {
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{
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.base.cra_name = "ecb(twofish)",
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.base.cra_driver_name = "ecb-twofish-3way",
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.base.cra_priority = 300,
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.base.cra_blocksize = TF_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct twofish_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = TF_MIN_KEY_SIZE,
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.max_keysize = TF_MAX_KEY_SIZE,
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.setkey = twofish_setkey_skcipher,
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.encrypt = ecb_encrypt,
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.decrypt = ecb_decrypt,
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}, {
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.base.cra_name = "cbc(twofish)",
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.base.cra_driver_name = "cbc-twofish-3way",
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.base.cra_priority = 300,
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.base.cra_blocksize = TF_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct twofish_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = TF_MIN_KEY_SIZE,
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.max_keysize = TF_MAX_KEY_SIZE,
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.ivsize = TF_BLOCK_SIZE,
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.setkey = twofish_setkey_skcipher,
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.encrypt = cbc_encrypt,
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.decrypt = cbc_decrypt,
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}, {
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.base.cra_name = "ctr(twofish)",
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.base.cra_driver_name = "ctr-twofish-3way",
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.base.cra_priority = 300,
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.base.cra_blocksize = 1,
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.base.cra_ctxsize = sizeof(struct twofish_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = TF_MIN_KEY_SIZE,
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.max_keysize = TF_MAX_KEY_SIZE,
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.ivsize = TF_BLOCK_SIZE,
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.chunksize = TF_BLOCK_SIZE,
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.setkey = twofish_setkey_skcipher,
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.encrypt = ctr_crypt,
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.decrypt = ctr_crypt,
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},
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};
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static bool is_blacklisted_cpu(void)
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{
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if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
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return false;
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if (boot_cpu_data.x86 == 0x06 &&
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(boot_cpu_data.x86_model == 0x1c ||
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boot_cpu_data.x86_model == 0x26 ||
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boot_cpu_data.x86_model == 0x36)) {
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/*
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* On Atom, twofish-3way is slower than original assembler
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* implementation. Twofish-3way trades off some performance in
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* storing blocks in 64bit registers to allow three blocks to
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* be processed parallel. Parallel operation then allows gaining
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* more performance than was trade off, on out-of-order CPUs.
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* However Atom does not benefit from this parallellism and
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* should be blacklisted.
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*/
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return true;
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}
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if (boot_cpu_data.x86 == 0x0f) {
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/*
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* On Pentium 4, twofish-3way is slower than original assembler
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* implementation because excessive uses of 64bit rotate and
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* left-shifts (which are really slow on P4) needed to store and
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* handle 128bit block in two 64bit registers.
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*/
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return true;
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}
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return false;
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}
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static int force;
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module_param(force, int, 0);
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MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
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static int __init init(void)
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{
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if (!force && is_blacklisted_cpu()) {
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printk(KERN_INFO
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"twofish-x86_64-3way: performance on this CPU "
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"would be suboptimal: disabling "
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"twofish-x86_64-3way.\n");
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return -ENODEV;
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}
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return crypto_register_skciphers(tf_skciphers,
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ARRAY_SIZE(tf_skciphers));
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}
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static void __exit fini(void)
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{
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crypto_unregister_skciphers(tf_skciphers, ARRAY_SIZE(tf_skciphers));
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}
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module_init(init);
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module_exit(fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Twofish Cipher Algorithm, 3-way parallel asm optimized");
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MODULE_ALIAS_CRYPTO("twofish");
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MODULE_ALIAS_CRYPTO("twofish-asm");
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