Release 4.14 arch/x86/crypto/blowfish_glue.c
/*
* 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>
*
* 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
*
*/
#include <asm/processor.h>
#include <crypto/blowfish.h>
#include <linux/crypto.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <crypto/algapi.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);
}
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static inline void blowfish_enc_blk_xor(struct bf_ctx *ctx, u8 *dst,
const u8 *src)
{
__blowfish_enc_blk(ctx, dst, src, true);
}
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static inline void blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst,
const u8 *src)
{
__blowfish_enc_blk_4way(ctx, dst, src, false);
}
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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);
}
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static void blowfish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
blowfish_enc_blk(crypto_tfm_ctx(tfm), dst, src);
}
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static void blowfish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
blowfish_dec_blk(crypto_tfm_ctx(tfm), dst, src);
}
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static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
void (*fn)(struct bf_ctx *, u8 *, const u8 *),
void (*fn_4way)(struct bf_ctx *, u8 *, const u8 *))
{
struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
unsigned int bsize = BF_BLOCK_SIZE;
unsigned int nbytes;
int err;
err = blkcipher_walk_virt(desc, walk);
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 = blkcipher_walk_done(desc, walk, nbytes);
}
return err;
}
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static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ecb_crypt(desc, &walk, blowfish_enc_blk, blowfish_enc_blk_4way);
}
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static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ecb_crypt(desc, &walk, blowfish_dec_blk, blowfish_dec_blk_4way);
}
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static unsigned int __cbc_encrypt(struct blkcipher_desc *desc,
struct blkcipher_walk *walk)
{
struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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;
}
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static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct blkcipher_walk walk;
int err;
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
while ((nbytes = walk.nbytes)) {
nbytes = __cbc_encrypt(desc, &walk);
err = blkcipher_walk_done(desc, &walk, nbytes);
}
return err;
}
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static unsigned int __cbc_decrypt(struct blkcipher_desc *desc,
struct blkcipher_walk *walk)
{
struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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;
}
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static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct blkcipher_walk walk;
int err;
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
while ((nbytes = walk.nbytes)) {
nbytes = __cbc_decrypt(desc, &walk);
err = blkcipher_walk_done(desc, &walk, nbytes);
}
return err;
}
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static void ctr_crypt_final(struct bf_ctx *ctx, struct blkcipher_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);
}
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static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
struct blkcipher_walk *walk)
{
struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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;
}
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static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct blkcipher_walk walk;
int err;
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt_block(desc, &walk, BF_BLOCK_SIZE);
while ((nbytes = walk.nbytes) >= BF_BLOCK_SIZE) {
nbytes = __ctr_crypt(desc, &walk);
err = blkcipher_walk_done(desc, &walk, nbytes);
}
if (walk.nbytes) {
ctr_crypt_final(crypto_blkcipher_ctx(desc->tfm), &walk);
err = blkcipher_walk_done(desc, &walk, 0);
}
return err;
}
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static struct crypto_alg bf_algs[4] = { {
.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,
}
}
}, {
.cra_name = "ecb(blowfish)",
.cra_driver_name = "ecb-blowfish-asm",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = BF_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct bf_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_u = {
.blkcipher = {
.min_keysize = BF_MIN_KEY_SIZE,
.max_keysize = BF_MAX_KEY_SIZE,
.setkey = blowfish_setkey,
.encrypt = ecb_encrypt,
.decrypt = ecb_decrypt,
},
},
}, {
.cra_name = "cbc(blowfish)",
.cra_driver_name = "cbc-blowfish-asm",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = BF_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct bf_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_u = {
.blkcipher = {
.min_keysize = BF_MIN_KEY_SIZE,
.max_keysize = BF_MAX_KEY_SIZE,
.ivsize = BF_BLOCK_SIZE,
.setkey = blowfish_setkey,
.encrypt = cbc_encrypt,
.decrypt = cbc_decrypt,
},
},
}, {
.cra_name = "ctr(blowfish)",
.cra_driver_name = "ctr-blowfish-asm",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct bf_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_u = {
.blkcipher = {
.min_keysize = BF_MIN_KEY_SIZE,
.max_keysize = BF_MAX_KEY_SIZE,
.ivsize = BF_BLOCK_SIZE,
.setkey = blowfish_setkey,
.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;
}
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static int force;
module_param(force, int, 0);
MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
static int __init init(void)
{
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;
}
return crypto_register_algs(bf_algs, ARRAY_SIZE(bf_algs));
}
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static void __exit fini(void)
{
crypto_unregister_algs(bf_algs, ARRAY_SIZE(bf_algs));
}
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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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| Person | Tokens | Prop | Commits | CommitProp |
| Jussi Kivilinna | 2367 | 99.79% | 5 | 71.43% |
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| Kees Cook | 2 | 0.08% | 1 | 14.29% |
| Total | 2372 | 100.00% | 7 | 100.00% |
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