482 lines
12 KiB
C
482 lines
12 KiB
C
/*
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* Glue Code for assembler optimized version of Blowfish
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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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* 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 <asm/processor.h>
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#include <crypto/blowfish.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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/* regular block cipher functions */
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asmlinkage void __blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src,
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bool xor);
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asmlinkage void blowfish_dec_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src);
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/* 4-way parallel cipher functions */
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asmlinkage void __blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst,
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const u8 *src, bool xor);
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asmlinkage void blowfish_dec_blk_4way(struct bf_ctx *ctx, u8 *dst,
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const u8 *src);
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static inline void blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src)
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{
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__blowfish_enc_blk(ctx, dst, src, false);
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}
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static inline void blowfish_enc_blk_xor(struct bf_ctx *ctx, u8 *dst,
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const u8 *src)
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{
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__blowfish_enc_blk(ctx, dst, src, true);
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}
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static inline void blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst,
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const u8 *src)
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{
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__blowfish_enc_blk_4way(ctx, dst, src, false);
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}
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static inline void blowfish_enc_blk_xor_4way(struct bf_ctx *ctx, u8 *dst,
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const u8 *src)
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{
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__blowfish_enc_blk_4way(ctx, dst, src, true);
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}
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static void blowfish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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blowfish_enc_blk(crypto_tfm_ctx(tfm), dst, src);
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}
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static void blowfish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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blowfish_dec_blk(crypto_tfm_ctx(tfm), dst, src);
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}
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static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
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void (*fn)(struct bf_ctx *, u8 *, const u8 *),
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void (*fn_4way)(struct bf_ctx *, u8 *, const u8 *))
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{
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struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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unsigned int bsize = BF_BLOCK_SIZE;
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unsigned int nbytes;
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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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/* Process four block batch */
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if (nbytes >= bsize * 4) {
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do {
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fn_4way(ctx, wdst, wsrc);
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wsrc += bsize * 4;
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wdst += bsize * 4;
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nbytes -= bsize * 4;
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} while (nbytes >= bsize * 4);
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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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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 = blkcipher_walk_done(desc, walk, nbytes);
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}
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return err;
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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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struct blkcipher_walk walk;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return ecb_crypt(desc, &walk, blowfish_enc_blk, blowfish_enc_blk_4way);
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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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struct blkcipher_walk walk;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return ecb_crypt(desc, &walk, blowfish_dec_blk, blowfish_dec_blk_4way);
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}
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static unsigned int __cbc_encrypt(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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unsigned int bsize = BF_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 *iv = (u64 *)walk->iv;
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do {
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*dst = *src ^ *iv;
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blowfish_enc_blk(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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*(u64 *)walk->iv = *iv;
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return 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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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 = __cbc_encrypt(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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static unsigned int __cbc_decrypt(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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unsigned int bsize = BF_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 ivs[4 - 1];
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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 four block batch */
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if (nbytes >= bsize * 4) {
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do {
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nbytes -= bsize * 4 - bsize;
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src -= 4 - 1;
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dst -= 4 - 1;
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ivs[0] = src[0];
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ivs[1] = src[1];
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ivs[2] = src[2];
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blowfish_dec_blk_4way(ctx, (u8 *)dst, (u8 *)src);
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dst[1] ^= ivs[0];
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dst[2] ^= ivs[1];
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dst[3] ^= ivs[2];
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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 * 4);
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}
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/* Handle leftovers */
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for (;;) {
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blowfish_dec_blk(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 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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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 = __cbc_decrypt(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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static void ctr_crypt_final(struct bf_ctx *ctx, struct blkcipher_walk *walk)
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{
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u8 *ctrblk = walk->iv;
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u8 keystream[BF_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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blowfish_enc_blk(ctx, keystream, ctrblk);
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crypto_xor_cpy(dst, keystream, src, nbytes);
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crypto_inc(ctrblk, BF_BLOCK_SIZE);
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}
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static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk)
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{
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struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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unsigned int bsize = BF_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 ctrblk = be64_to_cpu(*(__be64 *)walk->iv);
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__be64 ctrblocks[4];
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/* Process four block batch */
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if (nbytes >= bsize * 4) {
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do {
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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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dst[3] = src[3];
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}
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/* create ctrblks for parallel encrypt */
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ctrblocks[0] = cpu_to_be64(ctrblk++);
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ctrblocks[1] = cpu_to_be64(ctrblk++);
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ctrblocks[2] = cpu_to_be64(ctrblk++);
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ctrblocks[3] = cpu_to_be64(ctrblk++);
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blowfish_enc_blk_xor_4way(ctx, (u8 *)dst,
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(u8 *)ctrblocks);
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src += 4;
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dst += 4;
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} while ((nbytes -= bsize * 4) >= bsize * 4);
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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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if (dst != src)
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*dst = *src;
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ctrblocks[0] = cpu_to_be64(ctrblk++);
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blowfish_enc_blk_xor(ctx, (u8 *)dst, (u8 *)ctrblocks);
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src += 1;
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dst += 1;
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} while ((nbytes -= bsize) >= bsize);
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done:
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*(__be64 *)walk->iv = cpu_to_be64(ctrblk);
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return 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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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, BF_BLOCK_SIZE);
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while ((nbytes = walk.nbytes) >= BF_BLOCK_SIZE) {
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nbytes = __ctr_crypt(desc, &walk);
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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if (walk.nbytes) {
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ctr_crypt_final(crypto_blkcipher_ctx(desc->tfm), &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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static struct crypto_alg bf_algs[4] = { {
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.cra_name = "blowfish",
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.cra_driver_name = "blowfish-asm",
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.cra_priority = 200,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = BF_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct bf_ctx),
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.cra_alignmask = 0,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.cipher = {
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.cia_min_keysize = BF_MIN_KEY_SIZE,
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.cia_max_keysize = BF_MAX_KEY_SIZE,
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.cia_setkey = blowfish_setkey,
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.cia_encrypt = blowfish_encrypt,
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.cia_decrypt = blowfish_decrypt,
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}
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}
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}, {
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.cra_name = "ecb(blowfish)",
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.cra_driver_name = "ecb-blowfish-asm",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = BF_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct bf_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 = BF_MIN_KEY_SIZE,
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.max_keysize = BF_MAX_KEY_SIZE,
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.setkey = blowfish_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(blowfish)",
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.cra_driver_name = "cbc-blowfish-asm",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = BF_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct bf_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 = BF_MIN_KEY_SIZE,
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.max_keysize = BF_MAX_KEY_SIZE,
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.ivsize = BF_BLOCK_SIZE,
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.setkey = blowfish_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(blowfish)",
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.cra_driver_name = "ctr-blowfish-asm",
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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 bf_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 = BF_MIN_KEY_SIZE,
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.max_keysize = BF_MAX_KEY_SIZE,
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.ivsize = BF_BLOCK_SIZE,
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.setkey = blowfish_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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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 == 0x0f) {
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/*
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* On Pentium 4, blowfish-x86_64 is slower than generic C
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* implementation because use of 64bit rotates (which are really
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* slow on P4). Therefore blacklist P4s.
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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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"blowfish-x86_64: performance on this CPU "
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"would be suboptimal: disabling "
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"blowfish-x86_64.\n");
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return -ENODEV;
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}
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return crypto_register_algs(bf_algs, ARRAY_SIZE(bf_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(bf_algs, ARRAY_SIZE(bf_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("Blowfish Cipher Algorithm, asm optimized");
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MODULE_ALIAS_CRYPTO("blowfish");
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MODULE_ALIAS_CRYPTO("blowfish-asm");
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