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768db5fee3
DES or Triple DES in counter mode is never used in the kernel, so there is no point in keeping an accelerated implementation around. Acked-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
401 lines
9.2 KiB
C
401 lines
9.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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*/
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#include <crypto/algapi.h>
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#include <crypto/des.h>
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#include <crypto/internal/skcipher.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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struct des3_ede_x86_ctx {
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struct des3_ede_ctx enc;
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struct des3_ede_ctx dec;
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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 skcipher_request *req, const u32 *expkey)
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{
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const unsigned int bsize = DES3_EDE_BLOCK_SIZE;
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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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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 = skcipher_walk_done(&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 skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
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return ecb_crypt(req, ctx->enc.expkey);
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}
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static int ecb_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 des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
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return ecb_crypt(req, ctx->dec.expkey);
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}
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static unsigned int __cbc_encrypt(struct des3_ede_x86_ctx *ctx,
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struct skcipher_walk *walk)
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{
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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 skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct des3_ede_x86_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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nbytes = __cbc_encrypt(ctx, &walk);
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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 des3_ede_x86_ctx *ctx,
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struct skcipher_walk *walk)
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{
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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 skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct des3_ede_x86_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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nbytes = __cbc_decrypt(ctx, &walk);
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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 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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err = des3_ede_expand_key(&ctx->enc, key, keylen);
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if (err == -ENOKEY) {
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if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)
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err = -EINVAL;
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else
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err = 0;
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}
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if (err) {
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memset(ctx, 0, sizeof(*ctx));
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return err;
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}
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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 int des3_ede_x86_setkey_skcipher(struct crypto_skcipher *tfm,
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const u8 *key,
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unsigned int keylen)
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{
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return des3_ede_x86_setkey(&tfm->base, key, keylen);
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}
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static struct crypto_alg des3_ede_cipher = {
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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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static struct skcipher_alg des3_ede_skciphers[] = {
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{
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.base.cra_name = "ecb(des3_ede)",
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.base.cra_driver_name = "ecb-des3_ede-asm",
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.base.cra_priority = 300,
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.base.cra_blocksize = DES3_EDE_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct des3_ede_x86_ctx),
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.base.cra_module = THIS_MODULE,
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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_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(des3_ede)",
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.base.cra_driver_name = "cbc-des3_ede-asm",
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.base.cra_priority = 300,
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.base.cra_blocksize = DES3_EDE_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct des3_ede_x86_ctx),
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.base.cra_module = THIS_MODULE,
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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_skcipher,
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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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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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int err;
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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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err = crypto_register_alg(&des3_ede_cipher);
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if (err)
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return err;
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err = crypto_register_skciphers(des3_ede_skciphers,
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ARRAY_SIZE(des3_ede_skciphers));
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if (err)
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crypto_unregister_alg(&des3_ede_cipher);
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return err;
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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_alg(&des3_ede_cipher);
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crypto_unregister_skciphers(des3_ede_skciphers,
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ARRAY_SIZE(des3_ede_skciphers));
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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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