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a05248ed2d
This patch adds AVX optimized XTS-mode helper functions/macros and converts
serpent-avx to use the new facilities. Benefits are slightly improved speed
and reduced stack usage as use of temporary IV-array is avoided.
tcrypt results, with Intel i5-2450M:
enc dec
16B 1.00x 1.00x
64B 1.00x 1.00x
256B 1.04x 1.06x
1024B 1.09x 1.09x
8192B 1.10x 1.09x
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
403 lines
10 KiB
C
403 lines
10 KiB
C
/*
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* Shared glue code for 128bit block ciphers
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*
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* Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
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*
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* CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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* CTR part based on code (crypto/ctr.c) by:
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* (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
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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 <linux/module.h>
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#include <crypto/b128ops.h>
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#include <crypto/lrw.h>
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#include <crypto/xts.h>
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#include <asm/crypto/glue_helper.h>
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#include <crypto/scatterwalk.h>
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static int __glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx,
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struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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void *ctx = crypto_blkcipher_ctx(desc->tfm);
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const unsigned int bsize = 128 / 8;
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unsigned int nbytes, i, func_bytes;
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bool fpu_enabled = false;
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int err;
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err = blkcipher_walk_virt(desc, walk);
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while ((nbytes = walk->nbytes)) {
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u8 *wsrc = walk->src.virt.addr;
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u8 *wdst = walk->dst.virt.addr;
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fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
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desc, fpu_enabled, nbytes);
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for (i = 0; i < gctx->num_funcs; i++) {
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func_bytes = bsize * gctx->funcs[i].num_blocks;
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/* Process multi-block batch */
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if (nbytes >= func_bytes) {
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do {
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gctx->funcs[i].fn_u.ecb(ctx, wdst,
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wsrc);
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wsrc += func_bytes;
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wdst += func_bytes;
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nbytes -= func_bytes;
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} while (nbytes >= func_bytes);
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if (nbytes < bsize)
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goto done;
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}
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}
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done:
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err = blkcipher_walk_done(desc, walk, nbytes);
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}
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glue_fpu_end(fpu_enabled);
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return err;
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}
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int glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx,
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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 blkcipher_walk walk;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return __glue_ecb_crypt_128bit(gctx, desc, &walk);
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}
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EXPORT_SYMBOL_GPL(glue_ecb_crypt_128bit);
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static unsigned int __glue_cbc_encrypt_128bit(const common_glue_func_t fn,
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struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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void *ctx = crypto_blkcipher_ctx(desc->tfm);
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const unsigned int bsize = 128 / 8;
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unsigned int nbytes = walk->nbytes;
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u128 *src = (u128 *)walk->src.virt.addr;
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u128 *dst = (u128 *)walk->dst.virt.addr;
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u128 *iv = (u128 *)walk->iv;
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do {
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u128_xor(dst, src, iv);
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fn(ctx, (u8 *)dst, (u8 *)dst);
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iv = dst;
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src += 1;
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dst += 1;
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nbytes -= bsize;
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} while (nbytes >= bsize);
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*(u128 *)walk->iv = *iv;
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return nbytes;
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}
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int glue_cbc_encrypt_128bit(const common_glue_func_t fn,
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struct blkcipher_desc *desc,
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struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct blkcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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while ((nbytes = walk.nbytes)) {
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nbytes = __glue_cbc_encrypt_128bit(fn, desc, &walk);
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(glue_cbc_encrypt_128bit);
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static unsigned int
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__glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
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struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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void *ctx = crypto_blkcipher_ctx(desc->tfm);
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const unsigned int bsize = 128 / 8;
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unsigned int nbytes = walk->nbytes;
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u128 *src = (u128 *)walk->src.virt.addr;
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u128 *dst = (u128 *)walk->dst.virt.addr;
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u128 last_iv;
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unsigned int num_blocks, func_bytes;
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unsigned int i;
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/* Start of the last block. */
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src += nbytes / bsize - 1;
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dst += nbytes / bsize - 1;
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last_iv = *src;
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for (i = 0; i < gctx->num_funcs; i++) {
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num_blocks = gctx->funcs[i].num_blocks;
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func_bytes = bsize * num_blocks;
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/* Process multi-block batch */
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if (nbytes >= func_bytes) {
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do {
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nbytes -= func_bytes - bsize;
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src -= num_blocks - 1;
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dst -= num_blocks - 1;
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gctx->funcs[i].fn_u.cbc(ctx, dst, src);
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nbytes -= bsize;
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if (nbytes < bsize)
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goto done;
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u128_xor(dst, dst, src - 1);
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src -= 1;
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dst -= 1;
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} while (nbytes >= func_bytes);
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if (nbytes < bsize)
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goto done;
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}
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}
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done:
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u128_xor(dst, dst, (u128 *)walk->iv);
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*(u128 *)walk->iv = last_iv;
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return nbytes;
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}
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int glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
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struct blkcipher_desc *desc,
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struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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const unsigned int bsize = 128 / 8;
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bool fpu_enabled = false;
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struct blkcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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while ((nbytes = walk.nbytes)) {
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fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
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desc, fpu_enabled, nbytes);
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nbytes = __glue_cbc_decrypt_128bit(gctx, desc, &walk);
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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glue_fpu_end(fpu_enabled);
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return err;
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}
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EXPORT_SYMBOL_GPL(glue_cbc_decrypt_128bit);
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static void glue_ctr_crypt_final_128bit(const common_glue_ctr_func_t fn_ctr,
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struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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void *ctx = crypto_blkcipher_ctx(desc->tfm);
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u8 *src = (u8 *)walk->src.virt.addr;
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u8 *dst = (u8 *)walk->dst.virt.addr;
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unsigned int nbytes = walk->nbytes;
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le128 ctrblk;
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u128 tmp;
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be128_to_le128(&ctrblk, (be128 *)walk->iv);
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memcpy(&tmp, src, nbytes);
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fn_ctr(ctx, &tmp, &tmp, &ctrblk);
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memcpy(dst, &tmp, nbytes);
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le128_to_be128((be128 *)walk->iv, &ctrblk);
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}
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EXPORT_SYMBOL_GPL(glue_ctr_crypt_final_128bit);
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static unsigned int __glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx,
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struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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const unsigned int bsize = 128 / 8;
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void *ctx = crypto_blkcipher_ctx(desc->tfm);
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unsigned int nbytes = walk->nbytes;
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u128 *src = (u128 *)walk->src.virt.addr;
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u128 *dst = (u128 *)walk->dst.virt.addr;
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le128 ctrblk;
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unsigned int num_blocks, func_bytes;
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unsigned int i;
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be128_to_le128(&ctrblk, (be128 *)walk->iv);
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/* Process multi-block batch */
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for (i = 0; i < gctx->num_funcs; i++) {
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num_blocks = gctx->funcs[i].num_blocks;
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func_bytes = bsize * num_blocks;
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if (nbytes >= func_bytes) {
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do {
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gctx->funcs[i].fn_u.ctr(ctx, dst, src, &ctrblk);
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src += num_blocks;
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dst += num_blocks;
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nbytes -= func_bytes;
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} while (nbytes >= func_bytes);
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if (nbytes < bsize)
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goto done;
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}
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}
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done:
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le128_to_be128((be128 *)walk->iv, &ctrblk);
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return nbytes;
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}
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int glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx,
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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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const unsigned int bsize = 128 / 8;
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bool fpu_enabled = false;
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struct blkcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt_block(desc, &walk, bsize);
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while ((nbytes = walk.nbytes) >= bsize) {
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fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
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desc, fpu_enabled, nbytes);
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nbytes = __glue_ctr_crypt_128bit(gctx, desc, &walk);
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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glue_fpu_end(fpu_enabled);
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if (walk.nbytes) {
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glue_ctr_crypt_final_128bit(
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gctx->funcs[gctx->num_funcs - 1].fn_u.ctr, desc, &walk);
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err = blkcipher_walk_done(desc, &walk, 0);
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(glue_ctr_crypt_128bit);
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static unsigned int __glue_xts_crypt_128bit(const struct common_glue_ctx *gctx,
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void *ctx,
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struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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const unsigned int bsize = 128 / 8;
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unsigned int nbytes = walk->nbytes;
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u128 *src = (u128 *)walk->src.virt.addr;
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u128 *dst = (u128 *)walk->dst.virt.addr;
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unsigned int num_blocks, func_bytes;
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unsigned int i;
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/* Process multi-block batch */
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for (i = 0; i < gctx->num_funcs; i++) {
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num_blocks = gctx->funcs[i].num_blocks;
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func_bytes = bsize * num_blocks;
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if (nbytes >= func_bytes) {
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do {
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gctx->funcs[i].fn_u.xts(ctx, dst, src,
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(le128 *)walk->iv);
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src += num_blocks;
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dst += num_blocks;
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nbytes -= func_bytes;
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} while (nbytes >= func_bytes);
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if (nbytes < bsize)
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goto done;
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}
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}
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done:
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return nbytes;
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}
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/* for implementations implementing faster XTS IV generator */
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int glue_xts_crypt_128bit(const struct common_glue_ctx *gctx,
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struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes,
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void (*tweak_fn)(void *ctx, u8 *dst, const u8 *src),
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void *tweak_ctx, void *crypt_ctx)
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{
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const unsigned int bsize = 128 / 8;
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bool fpu_enabled = false;
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struct blkcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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nbytes = walk.nbytes;
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if (!nbytes)
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return err;
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/* set minimum length to bsize, for tweak_fn */
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fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
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desc, fpu_enabled,
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nbytes < bsize ? bsize : nbytes);
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/* calculate first value of T */
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tweak_fn(tweak_ctx, walk.iv, walk.iv);
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while (nbytes) {
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nbytes = __glue_xts_crypt_128bit(gctx, crypt_ctx, desc, &walk);
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err = blkcipher_walk_done(desc, &walk, nbytes);
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nbytes = walk.nbytes;
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}
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glue_fpu_end(fpu_enabled);
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return err;
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}
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EXPORT_SYMBOL_GPL(glue_xts_crypt_128bit);
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void glue_xts_crypt_128bit_one(void *ctx, u128 *dst, const u128 *src, le128 *iv,
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common_glue_func_t fn)
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{
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le128 ivblk = *iv;
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/* generate next IV */
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le128_gf128mul_x_ble(iv, &ivblk);
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/* CC <- T xor C */
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u128_xor(dst, src, (u128 *)&ivblk);
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/* PP <- D(Key2,CC) */
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fn(ctx, (u8 *)dst, (u8 *)dst);
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/* P <- T xor PP */
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u128_xor(dst, dst, (u128 *)&ivblk);
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}
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EXPORT_SYMBOL_GPL(glue_xts_crypt_128bit_one);
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MODULE_LICENSE("GPL");
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