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|
/*
* Copyright (C)2006 USAGI/WIDE Project
*
* 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
*
* Author:
* Kazunori Miyazawa <miyazawa@linux-ipv6.org>
*/
#include <linux/crypto.h>
#include <linux/err.h>
#include <linux/hardirq.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/scatterlist.h>
#include "internal.h"
static u_int32_t ks[12] = {0x01010101, 0x01010101, 0x01010101, 0x01010101,
0x02020202, 0x02020202, 0x02020202, 0x02020202,
0x03030303, 0x03030303, 0x03030303, 0x03030303};
/*
* +------------------------
* | <parent tfm>
* +------------------------
* | crypto_xcbc_ctx
* +------------------------
* | odds (block size)
* +------------------------
* | prev (block size)
* +------------------------
* | key (block size)
* +------------------------
* | consts (block size * 3)
* +------------------------
*/
struct crypto_xcbc_ctx {
struct crypto_cipher *child;
u8 *odds;
u8 *prev;
u8 *key;
u8 *consts;
void (*xor)(u8 *a, const u8 *b, unsigned int bs);
unsigned int keylen;
unsigned int len;
};
static void xor_128(u8 *a, const u8 *b, unsigned int bs)
{
((u32 *)a)[0] ^= ((u32 *)b)[0];
((u32 *)a)[1] ^= ((u32 *)b)[1];
((u32 *)a)[2] ^= ((u32 *)b)[2];
((u32 *)a)[3] ^= ((u32 *)b)[3];
}
static int _crypto_xcbc_digest_setkey(struct crypto_hash *parent,
struct crypto_xcbc_ctx *ctx)
{
int bs = crypto_hash_blocksize(parent);
int err = 0;
u8 key1[bs];
if ((err = crypto_cipher_setkey(ctx->child, ctx->key, ctx->keylen)))
return err;
crypto_cipher_encrypt_one(ctx->child, key1, ctx->consts);
return crypto_cipher_setkey(ctx->child, key1, bs);
}
static int crypto_xcbc_digest_setkey(struct crypto_hash *parent,
const u8 *inkey, unsigned int keylen)
{
struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
if (keylen != crypto_cipher_blocksize(ctx->child))
return -EINVAL;
ctx->keylen = keylen;
memcpy(ctx->key, inkey, keylen);
ctx->consts = (u8*)ks;
return _crypto_xcbc_digest_setkey(parent, ctx);
}
static int crypto_xcbc_digest_init(struct hash_desc *pdesc)
{
struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(pdesc->tfm);
int bs = crypto_hash_blocksize(pdesc->tfm);
ctx->len = 0;
memset(ctx->odds, 0, bs);
memset(ctx->prev, 0, bs);
return 0;
}
static int crypto_xcbc_digest_update2(struct hash_desc *pdesc,
struct scatterlist *sg,
unsigned int nbytes)
{
struct crypto_hash *parent = pdesc->tfm;
struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
struct crypto_cipher *tfm = ctx->child;
int bs = crypto_hash_blocksize(parent);
unsigned int i = 0;
do {
struct page *pg = sg[i].page;
unsigned int offset = sg[i].offset;
unsigned int slen = sg[i].length;
while (slen > 0) {
unsigned int len = min(slen, ((unsigned int)(PAGE_SIZE)) - offset);
char *p = crypto_kmap(pg, 0) + offset;
/* checking the data can fill the block */
if ((ctx->len + len) <= bs) {
memcpy(ctx->odds + ctx->len, p, len);
ctx->len += len;
slen -= len;
/* checking the rest of the page */
if (len + offset >= PAGE_SIZE) {
offset = 0;
pg++;
} else
offset += len;
crypto_kunmap(p, 0);
crypto_yield(pdesc->flags);
continue;
}
/* filling odds with new data and encrypting it */
memcpy(ctx->odds + ctx->len, p, bs - ctx->len);
len -= bs - ctx->len;
p += bs - ctx->len;
ctx->xor(ctx->prev, ctx->odds, bs);
crypto_cipher_encrypt_one(tfm, ctx->prev, ctx->prev);
/* clearing the length */
ctx->len = 0;
/* encrypting the rest of data */
while (len > bs) {
ctx->xor(ctx->prev, p, bs);
crypto_cipher_encrypt_one(tfm, ctx->prev,
ctx->prev);
p += bs;
len -= bs;
}
/* keeping the surplus of blocksize */
if (len) {
memcpy(ctx->odds, p, len);
ctx->len = len;
}
crypto_kunmap(p, 0);
crypto_yield(pdesc->flags);
slen -= min(slen, ((unsigned int)(PAGE_SIZE)) - offset);
offset = 0;
pg++;
}
nbytes-=sg[i].length;
i++;
} while (nbytes>0);
return 0;
}
static int crypto_xcbc_digest_update(struct hash_desc *pdesc,
struct scatterlist *sg,
unsigned int nbytes)
{
if (WARN_ON_ONCE(in_irq()))
return -EDEADLK;
return crypto_xcbc_digest_update2(pdesc, sg, nbytes);
}
static int crypto_xcbc_digest_final(struct hash_desc *pdesc, u8 *out)
{
struct crypto_hash *parent = pdesc->tfm;
struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
struct crypto_cipher *tfm = ctx->child;
int bs = crypto_hash_blocksize(parent);
int err = 0;
if (ctx->len == bs) {
u8 key2[bs];
if ((err = crypto_cipher_setkey(tfm, ctx->key, ctx->keylen)) != 0)
return err;
crypto_cipher_encrypt_one(tfm, key2,
(u8 *)(ctx->consts + bs));
ctx->xor(ctx->prev, ctx->odds, bs);
ctx->xor(ctx->prev, key2, bs);
_crypto_xcbc_digest_setkey(parent, ctx);
crypto_cipher_encrypt_one(tfm, out, ctx->prev);
} else {
u8 key3[bs];
unsigned int rlen;
u8 *p = ctx->odds + ctx->len;
*p = 0x80;
p++;
rlen = bs - ctx->len -1;
if (rlen)
memset(p, 0, rlen);
if ((err = crypto_cipher_setkey(tfm, ctx->key, ctx->keylen)) != 0)
return err;
crypto_cipher_encrypt_one(tfm, key3,
(u8 *)(ctx->consts + bs * 2));
ctx->xor(ctx->prev, ctx->odds, bs);
ctx->xor(ctx->prev, key3, bs);
_crypto_xcbc_digest_setkey(parent, ctx);
crypto_cipher_encrypt_one(tfm, out, ctx->prev);
}
return 0;
}
static int
|