393 lines
9.7 KiB
C
393 lines
9.7 KiB
C
/*
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* Glue Code for the AVX assembler implementation of the Cast5 Cipher
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*
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* Copyright (C) 2012 Johannes Goetzfried
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* <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
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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 <crypto/algapi.h>
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#include <crypto/cast5.h>
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#include <crypto/internal/simd.h>
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#include <linux/crypto.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#define CAST5_PARALLEL_BLOCKS 16
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asmlinkage void cast5_ecb_enc_16way(struct cast5_ctx *ctx, u8 *dst,
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const u8 *src);
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asmlinkage void cast5_ecb_dec_16way(struct cast5_ctx *ctx, u8 *dst,
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const u8 *src);
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asmlinkage void cast5_cbc_dec_16way(struct cast5_ctx *ctx, u8 *dst,
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const u8 *src);
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asmlinkage void cast5_ctr_16way(struct cast5_ctx *ctx, u8 *dst, const u8 *src,
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__be64 *iv);
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static int cast5_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int keylen)
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{
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return cast5_setkey(&tfm->base, key, keylen);
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}
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static inline bool cast5_fpu_begin(bool fpu_enabled, struct skcipher_walk *walk,
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unsigned int nbytes)
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{
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return glue_fpu_begin(CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS,
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walk, fpu_enabled, nbytes);
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}
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static inline void cast5_fpu_end(bool fpu_enabled)
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{
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return glue_fpu_end(fpu_enabled);
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}
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static int ecb_crypt(struct skcipher_request *req, bool enc)
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{
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bool fpu_enabled = false;
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct cast5_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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const unsigned int bsize = CAST5_BLOCK_SIZE;
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unsigned int nbytes;
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void (*fn)(struct cast5_ctx *ctx, u8 *dst, const u8 *src);
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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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 = cast5_fpu_begin(fpu_enabled, &walk, nbytes);
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/* Process multi-block batch */
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if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
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fn = (enc) ? cast5_ecb_enc_16way : cast5_ecb_dec_16way;
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do {
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fn(ctx, wdst, wsrc);
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wsrc += bsize * CAST5_PARALLEL_BLOCKS;
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wdst += bsize * CAST5_PARALLEL_BLOCKS;
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nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
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} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
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if (nbytes < bsize)
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goto done;
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}
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fn = (enc) ? __cast5_encrypt : __cast5_decrypt;
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/* Handle leftovers */
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do {
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fn(ctx, wdst, wsrc);
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wsrc += bsize;
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wdst += bsize;
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nbytes -= bsize;
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} while (nbytes >= bsize);
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done:
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err = skcipher_walk_done(&walk, nbytes);
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}
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cast5_fpu_end(fpu_enabled);
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return err;
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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 ecb_crypt(req, true);
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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 ecb_crypt(req, false);
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}
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static int cbc_encrypt(struct skcipher_request *req)
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{
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const unsigned int bsize = CAST5_BLOCK_SIZE;
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct cast5_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes)) {
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u64 *src = (u64 *)walk.src.virt.addr;
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u64 *dst = (u64 *)walk.dst.virt.addr;
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u64 *iv = (u64 *)walk.iv;
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do {
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*dst = *src ^ *iv;
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__cast5_encrypt(ctx, (u8 *)dst, (u8 *)dst);
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iv = dst;
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src++;
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dst++;
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nbytes -= bsize;
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} while (nbytes >= bsize);
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*(u64 *)walk.iv = *iv;
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err = skcipher_walk_done(&walk, nbytes);
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}
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return err;
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}
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static unsigned int __cbc_decrypt(struct cast5_ctx *ctx,
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struct skcipher_walk *walk)
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{
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const unsigned int bsize = CAST5_BLOCK_SIZE;
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unsigned int nbytes = walk->nbytes;
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u64 *src = (u64 *)walk->src.virt.addr;
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u64 *dst = (u64 *)walk->dst.virt.addr;
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u64 last_iv;
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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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/* Process multi-block batch */
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if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
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do {
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nbytes -= bsize * (CAST5_PARALLEL_BLOCKS - 1);
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src -= CAST5_PARALLEL_BLOCKS - 1;
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dst -= CAST5_PARALLEL_BLOCKS - 1;
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cast5_cbc_dec_16way(ctx, (u8 *)dst, (u8 *)src);
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nbytes -= bsize;
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if (nbytes < bsize)
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goto done;
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*dst ^= *(src - 1);
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src -= 1;
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dst -= 1;
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} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
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}
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/* Handle leftovers */
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for (;;) {
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__cast5_decrypt(ctx, (u8 *)dst, (u8 *)src);
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nbytes -= bsize;
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if (nbytes < bsize)
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break;
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*dst ^= *(src - 1);
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src -= 1;
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dst -= 1;
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}
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done:
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*dst ^= *(u64 *)walk->iv;
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*(u64 *)walk->iv = last_iv;
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return nbytes;
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}
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static int cbc_decrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct cast5_ctx *ctx = crypto_skcipher_ctx(tfm);
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bool fpu_enabled = false;
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes)) {
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fpu_enabled = cast5_fpu_begin(fpu_enabled, &walk, nbytes);
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nbytes = __cbc_decrypt(ctx, &walk);
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err = skcipher_walk_done(&walk, nbytes);
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}
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cast5_fpu_end(fpu_enabled);
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return err;
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}
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static void ctr_crypt_final(struct skcipher_walk *walk, struct cast5_ctx *ctx)
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{
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u8 *ctrblk = walk->iv;
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u8 keystream[CAST5_BLOCK_SIZE];
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u8 *src = walk->src.virt.addr;
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u8 *dst = walk->dst.virt.addr;
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unsigned int nbytes = walk->nbytes;
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__cast5_encrypt(ctx, keystream, ctrblk);
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crypto_xor_cpy(dst, keystream, src, nbytes);
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crypto_inc(ctrblk, CAST5_BLOCK_SIZE);
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}
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static unsigned int __ctr_crypt(struct skcipher_walk *walk,
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struct cast5_ctx *ctx)
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{
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const unsigned int bsize = CAST5_BLOCK_SIZE;
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unsigned int nbytes = walk->nbytes;
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u64 *src = (u64 *)walk->src.virt.addr;
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u64 *dst = (u64 *)walk->dst.virt.addr;
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/* Process multi-block batch */
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if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
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do {
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cast5_ctr_16way(ctx, (u8 *)dst, (u8 *)src,
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(__be64 *)walk->iv);
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src += CAST5_PARALLEL_BLOCKS;
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dst += CAST5_PARALLEL_BLOCKS;
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nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
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} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
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if (nbytes < bsize)
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goto done;
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}
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/* Handle leftovers */
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do {
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u64 ctrblk;
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if (dst != src)
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*dst = *src;
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ctrblk = *(u64 *)walk->iv;
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be64_add_cpu((__be64 *)walk->iv, 1);
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__cast5_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
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*dst ^= ctrblk;
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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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done:
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return nbytes;
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}
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static int ctr_crypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct cast5_ctx *ctx = crypto_skcipher_ctx(tfm);
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bool fpu_enabled = false;
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes) >= CAST5_BLOCK_SIZE) {
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fpu_enabled = cast5_fpu_begin(fpu_enabled, &walk, nbytes);
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nbytes = __ctr_crypt(&walk, ctx);
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err = skcipher_walk_done(&walk, nbytes);
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}
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cast5_fpu_end(fpu_enabled);
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if (walk.nbytes) {
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ctr_crypt_final(&walk, ctx);
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err = skcipher_walk_done(&walk, 0);
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}
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return err;
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}
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static struct skcipher_alg cast5_algs[] = {
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{
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.base.cra_name = "__ecb(cast5)",
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.base.cra_driver_name = "__ecb-cast5-avx",
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.base.cra_priority = 200,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = CAST5_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct cast5_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = CAST5_MIN_KEY_SIZE,
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.max_keysize = CAST5_MAX_KEY_SIZE,
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.setkey = cast5_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(cast5)",
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.base.cra_driver_name = "__cbc-cast5-avx",
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.base.cra_priority = 200,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = CAST5_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct cast5_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = CAST5_MIN_KEY_SIZE,
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.max_keysize = CAST5_MAX_KEY_SIZE,
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.ivsize = CAST5_BLOCK_SIZE,
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.setkey = cast5_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(cast5)",
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.base.cra_driver_name = "__ctr-cast5-avx",
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.base.cra_priority = 200,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = 1,
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.base.cra_ctxsize = sizeof(struct cast5_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = CAST5_MIN_KEY_SIZE,
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.max_keysize = CAST5_MAX_KEY_SIZE,
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.ivsize = CAST5_BLOCK_SIZE,
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.chunksize = CAST5_BLOCK_SIZE,
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.setkey = cast5_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 struct simd_skcipher_alg *cast5_simd_algs[ARRAY_SIZE(cast5_algs)];
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static int __init cast5_init(void)
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{
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const char *feature_name;
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if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
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&feature_name)) {
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pr_info("CPU feature '%s' is not supported.\n", feature_name);
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return -ENODEV;
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}
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return simd_register_skciphers_compat(cast5_algs,
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ARRAY_SIZE(cast5_algs),
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cast5_simd_algs);
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}
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static void __exit cast5_exit(void)
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{
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simd_unregister_skciphers(cast5_algs, ARRAY_SIZE(cast5_algs),
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cast5_simd_algs);
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}
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module_init(cast5_init);
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module_exit(cast5_exit);
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MODULE_DESCRIPTION("Cast5 Cipher Algorithm, AVX optimized");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_CRYPTO("cast5");
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