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linux-next/arch/x86/crypto/blowfish_glue.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 
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>
2019-05-30 11:26:35 -07:00

463 lines
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Glue Code for assembler optimized version of Blowfish
*
* Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
*
* CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
* CTR part based on code (crypto/ctr.c) by:
* (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
*/
#include <crypto/algapi.h>
#include <crypto/blowfish.h>
#include <crypto/internal/skcipher.h>
#include <linux/crypto.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
/* regular block cipher functions */
asmlinkage void __blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src,
bool xor);
asmlinkage void blowfish_dec_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src);
/* 4-way parallel cipher functions */
asmlinkage void __blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst,
const u8 *src, bool xor);
asmlinkage void blowfish_dec_blk_4way(struct bf_ctx *ctx, u8 *dst,
const u8 *src);
static inline void blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src)
{
__blowfish_enc_blk(ctx, dst, src, false);
}
static inline void blowfish_enc_blk_xor(struct bf_ctx *ctx, u8 *dst,
const u8 *src)
{
__blowfish_enc_blk(ctx, dst, src, true);
}
static inline void blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst,
const u8 *src)
{
__blowfish_enc_blk_4way(ctx, dst, src, false);
}
static inline void blowfish_enc_blk_xor_4way(struct bf_ctx *ctx, u8 *dst,
const u8 *src)
{
__blowfish_enc_blk_4way(ctx, dst, src, true);
}
static void blowfish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
blowfish_enc_blk(crypto_tfm_ctx(tfm), dst, src);
}
static void blowfish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
blowfish_dec_blk(crypto_tfm_ctx(tfm), dst, src);
}
static int blowfish_setkey_skcipher(struct crypto_skcipher *tfm,
const u8 *key, unsigned int keylen)
{
return blowfish_setkey(&tfm->base, key, keylen);
}
static int ecb_crypt(struct skcipher_request *req,
void (*fn)(struct bf_ctx *, u8 *, const u8 *),
void (*fn_4way)(struct bf_ctx *, u8 *, const u8 *))
{
unsigned int bsize = BF_BLOCK_SIZE;
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct bf_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes)) {
u8 *wsrc = walk.src.virt.addr;
u8 *wdst = walk.dst.virt.addr;
/* Process four block batch */
if (nbytes >= bsize * 4) {
do {
fn_4way(ctx, wdst, wsrc);
wsrc += bsize * 4;
wdst += bsize * 4;
nbytes -= bsize * 4;
} while (nbytes >= bsize * 4);
if (nbytes < bsize)
goto done;
}
/* Handle leftovers */
do {
fn(ctx, wdst, wsrc);
wsrc += bsize;
wdst += bsize;
nbytes -= bsize;
} while (nbytes >= bsize);
done:
err = skcipher_walk_done(&walk, nbytes);
}
return err;
}
static int ecb_encrypt(struct skcipher_request *req)
{
return ecb_crypt(req, blowfish_enc_blk, blowfish_enc_blk_4way);
}
static int ecb_decrypt(struct skcipher_request *req)
{
return ecb_crypt(req, blowfish_dec_blk, blowfish_dec_blk_4way);
}
static unsigned int __cbc_encrypt(struct bf_ctx *ctx,
struct skcipher_walk *walk)
{
unsigned int bsize = BF_BLOCK_SIZE;
unsigned int nbytes = walk->nbytes;
u64 *src = (u64 *)walk->src.virt.addr;
u64 *dst = (u64 *)walk->dst.virt.addr;
u64 *iv = (u64 *)walk->iv;
do {
*dst = *src ^ *iv;
blowfish_enc_blk(ctx, (u8 *)dst, (u8 *)dst);
iv = dst;
src += 1;
dst += 1;
nbytes -= bsize;
} while (nbytes >= bsize);
*(u64 *)walk->iv = *iv;
return nbytes;
}
static int cbc_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct bf_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes)) {
nbytes = __cbc_encrypt(ctx, &walk);
err = skcipher_walk_done(&walk, nbytes);
}
return err;
}
static unsigned int __cbc_decrypt(struct bf_ctx *ctx,
struct skcipher_walk *walk)
{
unsigned int bsize = BF_BLOCK_SIZE;
unsigned int nbytes = walk->nbytes;
u64 *src = (u64 *)walk->src.virt.addr;
u64 *dst = (u64 *)walk->dst.virt.addr;
u64 ivs[4 - 1];
u64 last_iv;
/* Start of the last block. */
src += nbytes / bsize - 1;
dst += nbytes / bsize - 1;
last_iv = *src;
/* Process four block batch */
if (nbytes >= bsize * 4) {
do {
nbytes -= bsize * 4 - bsize;
src -= 4 - 1;
dst -= 4 - 1;
ivs[0] = src[0];
ivs[1] = src[1];
ivs[2] = src[2];
blowfish_dec_blk_4way(ctx, (u8 *)dst, (u8 *)src);
dst[1] ^= ivs[0];
dst[2] ^= ivs[1];
dst[3] ^= ivs[2];
nbytes -= bsize;
if (nbytes < bsize)
goto done;
*dst ^= *(src - 1);
src -= 1;
dst -= 1;
} while (nbytes >= bsize * 4);
}
/* Handle leftovers */
for (;;) {
blowfish_dec_blk(ctx, (u8 *)dst, (u8 *)src);
nbytes -= bsize;
if (nbytes < bsize)
break;
*dst ^= *(src - 1);
src -= 1;
dst -= 1;
}
done:
*dst ^= *(u64 *)walk->iv;
*(u64 *)walk->iv = last_iv;
return nbytes;
}
static int cbc_decrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct bf_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes)) {
nbytes = __cbc_decrypt(ctx, &walk);
err = skcipher_walk_done(&walk, nbytes);
}
return err;
}
static void ctr_crypt_final(struct bf_ctx *ctx, struct skcipher_walk *walk)
{
u8 *ctrblk = walk->iv;
u8 keystream[BF_BLOCK_SIZE];
u8 *src = walk->src.virt.addr;
u8 *dst = walk->dst.virt.addr;
unsigned int nbytes = walk->nbytes;
blowfish_enc_blk(ctx, keystream, ctrblk);
crypto_xor_cpy(dst, keystream, src, nbytes);
crypto_inc(ctrblk, BF_BLOCK_SIZE);
}
static unsigned int __ctr_crypt(struct bf_ctx *ctx, struct skcipher_walk *walk)
{
unsigned int bsize = BF_BLOCK_SIZE;
unsigned int nbytes = walk->nbytes;
u64 *src = (u64 *)walk->src.virt.addr;
u64 *dst = (u64 *)walk->dst.virt.addr;
u64 ctrblk = be64_to_cpu(*(__be64 *)walk->iv);
__be64 ctrblocks[4];
/* Process four block batch */
if (nbytes >= bsize * 4) {
do {
if (dst != src) {
dst[0] = src[0];
dst[1] = src[1];
dst[2] = src[2];
dst[3] = src[3];
}
/* create ctrblks for parallel encrypt */
ctrblocks[0] = cpu_to_be64(ctrblk++);
ctrblocks[1] = cpu_to_be64(ctrblk++);
ctrblocks[2] = cpu_to_be64(ctrblk++);
ctrblocks[3] = cpu_to_be64(ctrblk++);
blowfish_enc_blk_xor_4way(ctx, (u8 *)dst,
(u8 *)ctrblocks);
src += 4;
dst += 4;
} while ((nbytes -= bsize * 4) >= bsize * 4);
if (nbytes < bsize)
goto done;
}
/* Handle leftovers */
do {
if (dst != src)
*dst = *src;
ctrblocks[0] = cpu_to_be64(ctrblk++);
blowfish_enc_blk_xor(ctx, (u8 *)dst, (u8 *)ctrblocks);
src += 1;
dst += 1;
} while ((nbytes -= bsize) >= bsize);
done:
*(__be64 *)walk->iv = cpu_to_be64(ctrblk);
return nbytes;
}
static int ctr_crypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct bf_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes) >= BF_BLOCK_SIZE) {
nbytes = __ctr_crypt(ctx, &walk);
err = skcipher_walk_done(&walk, nbytes);
}
if (nbytes) {
ctr_crypt_final(ctx, &walk);
err = skcipher_walk_done(&walk, 0);
}
return err;
}
static struct crypto_alg bf_cipher_alg = {
.cra_name = "blowfish",
.cra_driver_name = "blowfish-asm",
.cra_priority = 200,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = BF_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct bf_ctx),
.cra_alignmask = 0,
.cra_module = THIS_MODULE,
.cra_u = {
.cipher = {
.cia_min_keysize = BF_MIN_KEY_SIZE,
.cia_max_keysize = BF_MAX_KEY_SIZE,
.cia_setkey = blowfish_setkey,
.cia_encrypt = blowfish_encrypt,
.cia_decrypt = blowfish_decrypt,
}
}
};
static struct skcipher_alg bf_skcipher_algs[] = {
{
.base.cra_name = "ecb(blowfish)",
.base.cra_driver_name = "ecb-blowfish-asm",
.base.cra_priority = 300,
.base.cra_blocksize = BF_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct bf_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = BF_MIN_KEY_SIZE,
.max_keysize = BF_MAX_KEY_SIZE,
.setkey = blowfish_setkey_skcipher,
.encrypt = ecb_encrypt,
.decrypt = ecb_decrypt,
}, {
.base.cra_name = "cbc(blowfish)",
.base.cra_driver_name = "cbc-blowfish-asm",
.base.cra_priority = 300,
.base.cra_blocksize = BF_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct bf_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = BF_MIN_KEY_SIZE,
.max_keysize = BF_MAX_KEY_SIZE,
.ivsize = BF_BLOCK_SIZE,
.setkey = blowfish_setkey_skcipher,
.encrypt = cbc_encrypt,
.decrypt = cbc_decrypt,
}, {
.base.cra_name = "ctr(blowfish)",
.base.cra_driver_name = "ctr-blowfish-asm",
.base.cra_priority = 300,
.base.cra_blocksize = 1,
.base.cra_ctxsize = sizeof(struct bf_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = BF_MIN_KEY_SIZE,
.max_keysize = BF_MAX_KEY_SIZE,
.ivsize = BF_BLOCK_SIZE,
.chunksize = BF_BLOCK_SIZE,
.setkey = blowfish_setkey_skcipher,
.encrypt = ctr_crypt,
.decrypt = ctr_crypt,
},
};
static bool is_blacklisted_cpu(void)
{
if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
return false;
if (boot_cpu_data.x86 == 0x0f) {
/*
* On Pentium 4, blowfish-x86_64 is slower than generic C
* implementation because use of 64bit rotates (which are really
* slow on P4). Therefore blacklist P4s.
*/
return true;
}
return false;
}
static int force;
module_param(force, int, 0);
MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
static int __init init(void)
{
int err;
if (!force && is_blacklisted_cpu()) {
printk(KERN_INFO
"blowfish-x86_64: performance on this CPU "
"would be suboptimal: disabling "
"blowfish-x86_64.\n");
return -ENODEV;
}
err = crypto_register_alg(&bf_cipher_alg);
if (err)
return err;
err = crypto_register_skciphers(bf_skcipher_algs,
ARRAY_SIZE(bf_skcipher_algs));
if (err)
crypto_unregister_alg(&bf_cipher_alg);
return err;
}
static void __exit fini(void)
{
crypto_unregister_alg(&bf_cipher_alg);
crypto_unregister_skciphers(bf_skcipher_algs,
ARRAY_SIZE(bf_skcipher_algs));
}
module_init(init);
module_exit(fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Blowfish Cipher Algorithm, asm optimized");
MODULE_ALIAS_CRYPTO("blowfish");
MODULE_ALIAS_CRYPTO("blowfish-asm");
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