496 lines
13 KiB
C
496 lines
13 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/processor.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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#include <crypto/algapi.h>
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#include <crypto/twofish.h>
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#include <crypto/b128ops.h>
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#include <asm/crypto/twofish.h>
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#include <asm/crypto/glue_helper.h>
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#include <crypto/lrw.h>
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#include <crypto/xts.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 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 blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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return glue_ecb_crypt_128bit(&twofish_enc, desc, dst, src, nbytes);
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}
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static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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return glue_ecb_crypt_128bit(&twofish_dec, desc, dst, src, nbytes);
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}
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static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(twofish_enc_blk), desc,
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dst, src, nbytes);
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}
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static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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return glue_cbc_decrypt_128bit(&twofish_dec_cbc, desc, dst, src,
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nbytes);
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}
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static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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return glue_ctr_crypt_128bit(&twofish_ctr, desc, dst, src, nbytes);
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}
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static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
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{
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const unsigned int bsize = TF_BLOCK_SIZE;
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struct twofish_ctx *ctx = priv;
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int i;
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if (nbytes == 3 * bsize) {
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twofish_enc_blk_3way(ctx, srcdst, srcdst);
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return;
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}
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for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
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twofish_enc_blk(ctx, srcdst, srcdst);
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}
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static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
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{
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const unsigned int bsize = TF_BLOCK_SIZE;
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struct twofish_ctx *ctx = priv;
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int i;
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if (nbytes == 3 * bsize) {
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twofish_dec_blk_3way(ctx, srcdst, srcdst);
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return;
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}
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for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
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twofish_dec_blk(ctx, srcdst, srcdst);
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}
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int lrw_twofish_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct twofish_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
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int err;
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err = __twofish_setkey(&ctx->twofish_ctx, key, keylen - TF_BLOCK_SIZE,
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&tfm->crt_flags);
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if (err)
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return err;
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return lrw_init_table(&ctx->lrw_table, key + keylen - TF_BLOCK_SIZE);
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}
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EXPORT_SYMBOL_GPL(lrw_twofish_setkey);
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static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct twofish_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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be128 buf[3];
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struct lrw_crypt_req req = {
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.tbuf = buf,
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.tbuflen = sizeof(buf),
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.table_ctx = &ctx->lrw_table,
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.crypt_ctx = &ctx->twofish_ctx,
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.crypt_fn = encrypt_callback,
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};
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return lrw_crypt(desc, dst, src, nbytes, &req);
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}
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static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct twofish_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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be128 buf[3];
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struct lrw_crypt_req req = {
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.tbuf = buf,
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.tbuflen = sizeof(buf),
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.table_ctx = &ctx->lrw_table,
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.crypt_ctx = &ctx->twofish_ctx,
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.crypt_fn = decrypt_callback,
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};
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return lrw_crypt(desc, dst, src, nbytes, &req);
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}
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void lrw_twofish_exit_tfm(struct crypto_tfm *tfm)
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{
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struct twofish_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
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lrw_free_table(&ctx->lrw_table);
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}
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EXPORT_SYMBOL_GPL(lrw_twofish_exit_tfm);
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int xts_twofish_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct twofish_xts_ctx *ctx = crypto_tfm_ctx(tfm);
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u32 *flags = &tfm->crt_flags;
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int err;
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err = xts_check_key(tfm, key, keylen);
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if (err)
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return err;
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/* first half of xts-key is for crypt */
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err = __twofish_setkey(&ctx->crypt_ctx, key, keylen / 2, flags);
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if (err)
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return err;
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/* second half of xts-key is for tweak */
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return __twofish_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2,
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flags);
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}
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EXPORT_SYMBOL_GPL(xts_twofish_setkey);
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static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct twofish_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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be128 buf[3];
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struct xts_crypt_req req = {
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.tbuf = buf,
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.tbuflen = sizeof(buf),
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.tweak_ctx = &ctx->tweak_ctx,
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.tweak_fn = XTS_TWEAK_CAST(twofish_enc_blk),
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.crypt_ctx = &ctx->crypt_ctx,
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.crypt_fn = encrypt_callback,
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};
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return xts_crypt(desc, dst, src, nbytes, &req);
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}
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static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct twofish_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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be128 buf[3];
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struct xts_crypt_req req = {
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.tbuf = buf,
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.tbuflen = sizeof(buf),
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.tweak_ctx = &ctx->tweak_ctx,
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.tweak_fn = XTS_TWEAK_CAST(twofish_enc_blk),
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.crypt_ctx = &ctx->crypt_ctx,
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.crypt_fn = decrypt_callback,
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};
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return xts_crypt(desc, dst, src, nbytes, &req);
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}
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static struct crypto_alg tf_algs[5] = { {
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.cra_name = "ecb(twofish)",
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.cra_driver_name = "ecb-twofish-3way",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = TF_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct twofish_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.blkcipher = {
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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,
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.encrypt = ecb_encrypt,
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.decrypt = ecb_decrypt,
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},
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},
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}, {
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.cra_name = "cbc(twofish)",
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.cra_driver_name = "cbc-twofish-3way",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = TF_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct twofish_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.blkcipher = {
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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,
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.encrypt = cbc_encrypt,
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.decrypt = cbc_decrypt,
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},
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},
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}, {
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.cra_name = "ctr(twofish)",
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.cra_driver_name = "ctr-twofish-3way",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = 1,
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.cra_ctxsize = sizeof(struct twofish_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.blkcipher = {
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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,
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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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}, {
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.cra_name = "lrw(twofish)",
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.cra_driver_name = "lrw-twofish-3way",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = TF_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct twofish_lrw_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_exit = lrw_twofish_exit_tfm,
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.cra_u = {
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.blkcipher = {
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.min_keysize = TF_MIN_KEY_SIZE + TF_BLOCK_SIZE,
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.max_keysize = TF_MAX_KEY_SIZE + TF_BLOCK_SIZE,
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.ivsize = TF_BLOCK_SIZE,
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.setkey = lrw_twofish_setkey,
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.encrypt = lrw_encrypt,
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.decrypt = lrw_decrypt,
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},
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},
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}, {
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.cra_name = "xts(twofish)",
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.cra_driver_name = "xts-twofish-3way",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = TF_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct twofish_xts_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.blkcipher = {
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.min_keysize = TF_MIN_KEY_SIZE * 2,
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.max_keysize = TF_MAX_KEY_SIZE * 2,
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.ivsize = TF_BLOCK_SIZE,
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.setkey = xts_twofish_setkey,
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.encrypt = xts_encrypt,
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.decrypt = xts_decrypt,
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},
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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_algs(tf_algs, ARRAY_SIZE(tf_algs));
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}
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static void __exit fini(void)
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{
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crypto_unregister_algs(tf_algs, ARRAY_SIZE(tf_algs));
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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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