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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
378 lines
9.0 KiB
C
378 lines
9.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Glue Code for the AVX assembler implementation of the Cast5 Cipher
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*
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* Copyright (C) 2012 Johannes Goetzfried
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* <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
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*/
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#include <asm/crypto/glue_helper.h>
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#include <crypto/algapi.h>
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#include <crypto/cast5.h>
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#include <crypto/internal/simd.h>
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#include <linux/crypto.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#define CAST5_PARALLEL_BLOCKS 16
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asmlinkage void cast5_ecb_enc_16way(struct cast5_ctx *ctx, u8 *dst,
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const u8 *src);
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asmlinkage void cast5_ecb_dec_16way(struct cast5_ctx *ctx, u8 *dst,
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const u8 *src);
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asmlinkage void cast5_cbc_dec_16way(struct cast5_ctx *ctx, u8 *dst,
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const u8 *src);
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asmlinkage void cast5_ctr_16way(struct cast5_ctx *ctx, u8 *dst, const u8 *src,
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__be64 *iv);
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static int cast5_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int keylen)
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{
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return cast5_setkey(&tfm->base, key, keylen);
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}
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static inline bool cast5_fpu_begin(bool fpu_enabled, struct skcipher_walk *walk,
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unsigned int nbytes)
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{
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return glue_fpu_begin(CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS,
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walk, fpu_enabled, nbytes);
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}
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static inline void cast5_fpu_end(bool fpu_enabled)
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{
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return glue_fpu_end(fpu_enabled);
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}
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static int ecb_crypt(struct skcipher_request *req, bool enc)
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{
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bool fpu_enabled = false;
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct cast5_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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const unsigned int bsize = CAST5_BLOCK_SIZE;
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unsigned int nbytes;
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void (*fn)(struct cast5_ctx *ctx, u8 *dst, const u8 *src);
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes)) {
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u8 *wsrc = walk.src.virt.addr;
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u8 *wdst = walk.dst.virt.addr;
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fpu_enabled = cast5_fpu_begin(fpu_enabled, &walk, nbytes);
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/* Process multi-block batch */
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if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
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fn = (enc) ? cast5_ecb_enc_16way : cast5_ecb_dec_16way;
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do {
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fn(ctx, wdst, wsrc);
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wsrc += bsize * CAST5_PARALLEL_BLOCKS;
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wdst += bsize * CAST5_PARALLEL_BLOCKS;
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nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
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} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
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if (nbytes < bsize)
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goto done;
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}
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fn = (enc) ? __cast5_encrypt : __cast5_decrypt;
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/* Handle leftovers */
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do {
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fn(ctx, wdst, wsrc);
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wsrc += bsize;
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wdst += bsize;
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nbytes -= bsize;
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} while (nbytes >= bsize);
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done:
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err = skcipher_walk_done(&walk, nbytes);
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}
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cast5_fpu_end(fpu_enabled);
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return err;
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}
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static int ecb_encrypt(struct skcipher_request *req)
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{
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return ecb_crypt(req, true);
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}
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static int ecb_decrypt(struct skcipher_request *req)
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{
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return ecb_crypt(req, false);
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}
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static int cbc_encrypt(struct skcipher_request *req)
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{
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const unsigned int bsize = CAST5_BLOCK_SIZE;
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct cast5_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes)) {
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u64 *src = (u64 *)walk.src.virt.addr;
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u64 *dst = (u64 *)walk.dst.virt.addr;
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u64 *iv = (u64 *)walk.iv;
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do {
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*dst = *src ^ *iv;
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__cast5_encrypt(ctx, (u8 *)dst, (u8 *)dst);
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iv = dst;
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src++;
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dst++;
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nbytes -= bsize;
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} while (nbytes >= bsize);
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*(u64 *)walk.iv = *iv;
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err = skcipher_walk_done(&walk, nbytes);
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}
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return err;
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}
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static unsigned int __cbc_decrypt(struct cast5_ctx *ctx,
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struct skcipher_walk *walk)
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{
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const unsigned int bsize = CAST5_BLOCK_SIZE;
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unsigned int nbytes = walk->nbytes;
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u64 *src = (u64 *)walk->src.virt.addr;
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u64 *dst = (u64 *)walk->dst.virt.addr;
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u64 last_iv;
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/* Start of the last block. */
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src += nbytes / bsize - 1;
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dst += nbytes / bsize - 1;
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last_iv = *src;
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/* Process multi-block batch */
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if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
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do {
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nbytes -= bsize * (CAST5_PARALLEL_BLOCKS - 1);
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src -= CAST5_PARALLEL_BLOCKS - 1;
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dst -= CAST5_PARALLEL_BLOCKS - 1;
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cast5_cbc_dec_16way(ctx, (u8 *)dst, (u8 *)src);
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nbytes -= bsize;
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if (nbytes < bsize)
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goto done;
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*dst ^= *(src - 1);
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src -= 1;
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dst -= 1;
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} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
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}
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/* Handle leftovers */
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for (;;) {
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__cast5_decrypt(ctx, (u8 *)dst, (u8 *)src);
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nbytes -= bsize;
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if (nbytes < bsize)
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break;
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*dst ^= *(src - 1);
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src -= 1;
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dst -= 1;
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}
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done:
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*dst ^= *(u64 *)walk->iv;
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*(u64 *)walk->iv = last_iv;
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return nbytes;
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}
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static int cbc_decrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct cast5_ctx *ctx = crypto_skcipher_ctx(tfm);
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bool fpu_enabled = false;
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes)) {
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fpu_enabled = cast5_fpu_begin(fpu_enabled, &walk, nbytes);
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nbytes = __cbc_decrypt(ctx, &walk);
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err = skcipher_walk_done(&walk, nbytes);
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}
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cast5_fpu_end(fpu_enabled);
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return err;
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}
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static void ctr_crypt_final(struct skcipher_walk *walk, struct cast5_ctx *ctx)
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{
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u8 *ctrblk = walk->iv;
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u8 keystream[CAST5_BLOCK_SIZE];
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u8 *src = walk->src.virt.addr;
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u8 *dst = walk->dst.virt.addr;
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unsigned int nbytes = walk->nbytes;
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__cast5_encrypt(ctx, keystream, ctrblk);
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crypto_xor_cpy(dst, keystream, src, nbytes);
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crypto_inc(ctrblk, CAST5_BLOCK_SIZE);
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}
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static unsigned int __ctr_crypt(struct skcipher_walk *walk,
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struct cast5_ctx *ctx)
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{
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const unsigned int bsize = CAST5_BLOCK_SIZE;
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unsigned int nbytes = walk->nbytes;
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u64 *src = (u64 *)walk->src.virt.addr;
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u64 *dst = (u64 *)walk->dst.virt.addr;
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/* Process multi-block batch */
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if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
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do {
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cast5_ctr_16way(ctx, (u8 *)dst, (u8 *)src,
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(__be64 *)walk->iv);
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src += CAST5_PARALLEL_BLOCKS;
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dst += CAST5_PARALLEL_BLOCKS;
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nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
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} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
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if (nbytes < bsize)
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goto done;
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}
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/* Handle leftovers */
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do {
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u64 ctrblk;
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if (dst != src)
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*dst = *src;
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ctrblk = *(u64 *)walk->iv;
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be64_add_cpu((__be64 *)walk->iv, 1);
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__cast5_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
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*dst ^= ctrblk;
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src += 1;
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dst += 1;
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nbytes -= bsize;
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} while (nbytes >= bsize);
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done:
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return nbytes;
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}
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static int ctr_crypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct cast5_ctx *ctx = crypto_skcipher_ctx(tfm);
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bool fpu_enabled = false;
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struct skcipher_walk walk;
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unsigned int nbytes;
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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while ((nbytes = walk.nbytes) >= CAST5_BLOCK_SIZE) {
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fpu_enabled = cast5_fpu_begin(fpu_enabled, &walk, nbytes);
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nbytes = __ctr_crypt(&walk, ctx);
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err = skcipher_walk_done(&walk, nbytes);
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}
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cast5_fpu_end(fpu_enabled);
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if (walk.nbytes) {
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ctr_crypt_final(&walk, ctx);
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err = skcipher_walk_done(&walk, 0);
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}
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return err;
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}
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static struct skcipher_alg cast5_algs[] = {
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{
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.base.cra_name = "__ecb(cast5)",
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.base.cra_driver_name = "__ecb-cast5-avx",
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.base.cra_priority = 200,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = CAST5_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct cast5_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = CAST5_MIN_KEY_SIZE,
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.max_keysize = CAST5_MAX_KEY_SIZE,
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.setkey = cast5_setkey_skcipher,
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.encrypt = ecb_encrypt,
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.decrypt = ecb_decrypt,
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}, {
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.base.cra_name = "__cbc(cast5)",
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.base.cra_driver_name = "__cbc-cast5-avx",
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.base.cra_priority = 200,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = CAST5_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct cast5_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = CAST5_MIN_KEY_SIZE,
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.max_keysize = CAST5_MAX_KEY_SIZE,
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.ivsize = CAST5_BLOCK_SIZE,
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.setkey = cast5_setkey_skcipher,
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.encrypt = cbc_encrypt,
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.decrypt = cbc_decrypt,
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}, {
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.base.cra_name = "__ctr(cast5)",
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.base.cra_driver_name = "__ctr-cast5-avx",
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.base.cra_priority = 200,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = 1,
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.base.cra_ctxsize = sizeof(struct cast5_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = CAST5_MIN_KEY_SIZE,
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.max_keysize = CAST5_MAX_KEY_SIZE,
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.ivsize = CAST5_BLOCK_SIZE,
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.chunksize = CAST5_BLOCK_SIZE,
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.setkey = cast5_setkey_skcipher,
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.encrypt = ctr_crypt,
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.decrypt = ctr_crypt,
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}
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};
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static struct simd_skcipher_alg *cast5_simd_algs[ARRAY_SIZE(cast5_algs)];
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static int __init cast5_init(void)
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{
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const char *feature_name;
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if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
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&feature_name)) {
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pr_info("CPU feature '%s' is not supported.\n", feature_name);
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return -ENODEV;
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}
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return simd_register_skciphers_compat(cast5_algs,
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ARRAY_SIZE(cast5_algs),
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cast5_simd_algs);
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}
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static void __exit cast5_exit(void)
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{
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simd_unregister_skciphers(cast5_algs, ARRAY_SIZE(cast5_algs),
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cast5_simd_algs);
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}
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module_init(cast5_init);
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module_exit(cast5_exit);
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MODULE_DESCRIPTION("Cast5 Cipher Algorithm, AVX optimized");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_CRYPTO("cast5");
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