508 строки
12 KiB
C
508 строки
12 KiB
C
/*
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* Glue Code for assembler optimized version of 3DES
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*
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* Copyright © 2014 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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*/
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#include <asm/processor.h>
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#include <crypto/des.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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struct des3_ede_x86_ctx {
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u32 enc_expkey[DES3_EDE_EXPKEY_WORDS];
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u32 dec_expkey[DES3_EDE_EXPKEY_WORDS];
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};
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/* regular block cipher functions */
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asmlinkage void des3_ede_x86_64_crypt_blk(const u32 *expkey, u8 *dst,
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const u8 *src);
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/* 3-way parallel cipher functions */
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asmlinkage void des3_ede_x86_64_crypt_blk_3way(const u32 *expkey, u8 *dst,
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const u8 *src);
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static inline void des3_ede_enc_blk(struct des3_ede_x86_ctx *ctx, u8 *dst,
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const u8 *src)
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{
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u32 *enc_ctx = ctx->enc_expkey;
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des3_ede_x86_64_crypt_blk(enc_ctx, dst, src);
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}
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static inline void des3_ede_dec_blk(struct des3_ede_x86_ctx *ctx, u8 *dst,
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const u8 *src)
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{
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u32 *dec_ctx = ctx->dec_expkey;
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des3_ede_x86_64_crypt_blk(dec_ctx, dst, src);
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}
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static inline void des3_ede_enc_blk_3way(struct des3_ede_x86_ctx *ctx, u8 *dst,
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const u8 *src)
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{
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u32 *enc_ctx = ctx->enc_expkey;
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des3_ede_x86_64_crypt_blk_3way(enc_ctx, dst, src);
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}
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static inline void des3_ede_dec_blk_3way(struct des3_ede_x86_ctx *ctx, u8 *dst,
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const u8 *src)
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{
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u32 *dec_ctx = ctx->dec_expkey;
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des3_ede_x86_64_crypt_blk_3way(dec_ctx, dst, src);
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}
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static void des3_ede_x86_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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des3_ede_enc_blk(crypto_tfm_ctx(tfm), dst, src);
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}
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static void des3_ede_x86_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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des3_ede_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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const u32 *expkey)
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{
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unsigned int bsize = DES3_EDE_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 * 3) {
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do {
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des3_ede_x86_64_crypt_blk_3way(expkey, wdst,
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wsrc);
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wsrc += bsize * 3;
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wdst += bsize * 3;
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nbytes -= bsize * 3;
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} while (nbytes >= bsize * 3);
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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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des3_ede_x86_64_crypt_blk(expkey, 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 des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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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, ctx->enc_expkey);
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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 des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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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, ctx->dec_expkey);
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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 des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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unsigned int bsize = DES3_EDE_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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des3_ede_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 des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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unsigned int bsize = DES3_EDE_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[3 - 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 * 3) {
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do {
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nbytes -= bsize * 3 - bsize;
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src -= 3 - 1;
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dst -= 3 - 1;
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ivs[0] = src[0];
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ivs[1] = src[1];
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des3_ede_dec_blk_3way(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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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 * 3);
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}
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/* Handle leftovers */
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for (;;) {
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des3_ede_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 des3_ede_x86_ctx *ctx,
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struct blkcipher_walk *walk)
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{
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u8 *ctrblk = walk->iv;
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u8 keystream[DES3_EDE_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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des3_ede_enc_blk(ctx, keystream, ctrblk);
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crypto_xor(keystream, src, nbytes);
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memcpy(dst, keystream, nbytes);
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crypto_inc(ctrblk, DES3_EDE_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 des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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unsigned int bsize = DES3_EDE_BLOCK_SIZE;
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unsigned int nbytes = walk->nbytes;
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__be64 *src = (__be64 *)walk->src.virt.addr;
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__be64 *dst = (__be64 *)walk->dst.virt.addr;
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u64 ctrblk = be64_to_cpu(*(__be64 *)walk->iv);
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__be64 ctrblocks[3];
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/* Process four block batch */
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if (nbytes >= bsize * 3) {
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do {
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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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des3_ede_enc_blk_3way(ctx, (u8 *)ctrblocks,
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(u8 *)ctrblocks);
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dst[0] = src[0] ^ ctrblocks[0];
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dst[1] = src[1] ^ ctrblocks[1];
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dst[2] = src[2] ^ ctrblocks[2];
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src += 3;
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dst += 3;
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} while ((nbytes -= bsize * 3) >= bsize * 3);
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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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ctrblocks[0] = cpu_to_be64(ctrblk++);
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des3_ede_enc_blk(ctx, (u8 *)ctrblocks, (u8 *)ctrblocks);
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dst[0] = src[0] ^ ctrblocks[0];
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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, DES3_EDE_BLOCK_SIZE);
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while ((nbytes = walk.nbytes) >= DES3_EDE_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 int des3_ede_x86_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct des3_ede_x86_ctx *ctx = crypto_tfm_ctx(tfm);
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u32 i, j, tmp;
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int err;
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/* Generate encryption context using generic implementation. */
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err = __des3_ede_setkey(ctx->enc_expkey, &tfm->crt_flags, key, keylen);
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if (err < 0)
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return err;
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/* Fix encryption context for this implementation and form decryption
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* context. */
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j = DES3_EDE_EXPKEY_WORDS - 2;
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for (i = 0; i < DES3_EDE_EXPKEY_WORDS; i += 2, j -= 2) {
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tmp = ror32(ctx->enc_expkey[i + 1], 4);
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ctx->enc_expkey[i + 1] = tmp;
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ctx->dec_expkey[j + 0] = ctx->enc_expkey[i + 0];
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ctx->dec_expkey[j + 1] = tmp;
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}
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return 0;
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}
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static struct crypto_alg des3_ede_algs[4] = { {
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.cra_name = "des3_ede",
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.cra_driver_name = "des3_ede-asm",
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.cra_priority = 200,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = DES3_EDE_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct des3_ede_x86_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 = DES3_EDE_KEY_SIZE,
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.cia_max_keysize = DES3_EDE_KEY_SIZE,
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.cia_setkey = des3_ede_x86_setkey,
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.cia_encrypt = des3_ede_x86_encrypt,
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.cia_decrypt = des3_ede_x86_decrypt,
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}
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}
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}, {
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.cra_name = "ecb(des3_ede)",
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.cra_driver_name = "ecb-des3_ede-asm",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = DES3_EDE_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct des3_ede_x86_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 = DES3_EDE_KEY_SIZE,
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.max_keysize = DES3_EDE_KEY_SIZE,
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.setkey = des3_ede_x86_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(des3_ede)",
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.cra_driver_name = "cbc-des3_ede-asm",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = DES3_EDE_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct des3_ede_x86_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 = DES3_EDE_KEY_SIZE,
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.max_keysize = DES3_EDE_KEY_SIZE,
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.ivsize = DES3_EDE_BLOCK_SIZE,
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.setkey = des3_ede_x86_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(des3_ede)",
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.cra_driver_name = "ctr-des3_ede-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 des3_ede_x86_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 = DES3_EDE_KEY_SIZE,
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.max_keysize = DES3_EDE_KEY_SIZE,
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.ivsize = DES3_EDE_BLOCK_SIZE,
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.setkey = des3_ede_x86_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, des3_ede-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 des3_ede_x86_init(void)
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{
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if (!force && is_blacklisted_cpu()) {
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pr_info("des3_ede-x86_64: performance on this CPU would be suboptimal: disabling des3_ede-x86_64.\n");
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return -ENODEV;
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}
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return crypto_register_algs(des3_ede_algs, ARRAY_SIZE(des3_ede_algs));
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}
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static void __exit des3_ede_x86_fini(void)
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{
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crypto_unregister_algs(des3_ede_algs, ARRAY_SIZE(des3_ede_algs));
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}
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module_init(des3_ede_x86_init);
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module_exit(des3_ede_x86_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Triple DES EDE Cipher Algorithm, asm optimized");
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MODULE_ALIAS_CRYPTO("des3_ede");
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MODULE_ALIAS_CRYPTO("des3_ede-asm");
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MODULE_AUTHOR("Jussi Kivilinna <jussi.kivilinna@iki.fi>");
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