2019-05-19 07:51:43 -06:00
|
|
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
2006-10-27 21:15:24 -06:00
|
|
|
/*
|
|
|
|
* Copyright (C)2006 USAGI/WIDE Project
|
|
|
|
*
|
|
|
|
* Author:
|
|
|
|
* Kazunori Miyazawa <miyazawa@linux-ipv6.org>
|
|
|
|
*/
|
|
|
|
|
2009-07-11 22:48:32 -06:00
|
|
|
#include <crypto/internal/hash.h>
|
2006-10-27 21:15:24 -06:00
|
|
|
#include <linux/err.h>
|
|
|
|
#include <linux/kernel.h>
|
2011-05-27 12:41:48 -06:00
|
|
|
#include <linux/module.h>
|
2006-10-27 21:15:24 -06:00
|
|
|
|
2006-11-16 19:43:04 -07:00
|
|
|
static u_int32_t ks[12] = {0x01010101, 0x01010101, 0x01010101, 0x01010101,
|
|
|
|
0x02020202, 0x02020202, 0x02020202, 0x02020202,
|
|
|
|
0x03030303, 0x03030303, 0x03030303, 0x03030303};
|
2009-07-22 00:37:15 -06:00
|
|
|
|
2006-10-27 21:15:24 -06:00
|
|
|
/*
|
|
|
|
* +------------------------
|
|
|
|
* | <parent tfm>
|
|
|
|
* +------------------------
|
2009-07-22 00:37:15 -06:00
|
|
|
* | xcbc_tfm_ctx
|
2006-10-27 21:15:24 -06:00
|
|
|
* +------------------------
|
2009-07-22 00:37:15 -06:00
|
|
|
* | consts (block size * 2)
|
2006-10-27 21:15:24 -06:00
|
|
|
* +------------------------
|
2009-07-22 00:37:15 -06:00
|
|
|
*/
|
|
|
|
struct xcbc_tfm_ctx {
|
|
|
|
struct crypto_cipher *child;
|
|
|
|
u8 ctx[];
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
2006-10-27 21:15:24 -06:00
|
|
|
* +------------------------
|
2009-07-22 00:37:15 -06:00
|
|
|
* | <shash desc>
|
2006-10-27 21:15:24 -06:00
|
|
|
* +------------------------
|
2009-07-22 00:37:15 -06:00
|
|
|
* | xcbc_desc_ctx
|
|
|
|
* +------------------------
|
|
|
|
* | odds (block size)
|
|
|
|
* +------------------------
|
|
|
|
* | prev (block size)
|
2006-10-27 21:15:24 -06:00
|
|
|
* +------------------------
|
|
|
|
*/
|
2009-07-22 00:37:15 -06:00
|
|
|
struct xcbc_desc_ctx {
|
2006-10-27 21:15:24 -06:00
|
|
|
unsigned int len;
|
2009-07-22 00:37:15 -06:00
|
|
|
u8 ctx[];
|
2006-10-27 21:15:24 -06:00
|
|
|
};
|
|
|
|
|
2018-08-07 15:18:35 -06:00
|
|
|
#define XCBC_BLOCKSIZE 16
|
|
|
|
|
2009-07-22 00:37:15 -06:00
|
|
|
static int crypto_xcbc_digest_setkey(struct crypto_shash *parent,
|
|
|
|
const u8 *inkey, unsigned int keylen)
|
2006-10-27 21:15:24 -06:00
|
|
|
{
|
2009-07-22 00:37:15 -06:00
|
|
|
unsigned long alignmask = crypto_shash_alignmask(parent);
|
|
|
|
struct xcbc_tfm_ctx *ctx = crypto_shash_ctx(parent);
|
|
|
|
u8 *consts = PTR_ALIGN(&ctx->ctx[0], alignmask + 1);
|
2006-10-27 21:15:24 -06:00
|
|
|
int err = 0;
|
2018-08-07 15:18:35 -06:00
|
|
|
u8 key1[XCBC_BLOCKSIZE];
|
|
|
|
int bs = sizeof(key1);
|
2006-10-27 21:15:24 -06:00
|
|
|
|
2009-07-22 00:37:15 -06:00
|
|
|
if ((err = crypto_cipher_setkey(ctx->child, inkey, keylen)))
|
|
|
|
return err;
|
2006-10-27 21:15:24 -06:00
|
|
|
|
2009-07-22 00:37:15 -06:00
|
|
|
crypto_cipher_encrypt_one(ctx->child, consts, (u8 *)ks + bs);
|
|
|
|
crypto_cipher_encrypt_one(ctx->child, consts + bs, (u8 *)ks + bs * 2);
|
|
|
|
crypto_cipher_encrypt_one(ctx->child, key1, (u8 *)ks);
|
2006-10-27 21:15:24 -06:00
|
|
|
|
|
|
|
return crypto_cipher_setkey(ctx->child, key1, bs);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
2009-07-11 22:48:32 -06:00
|
|
|
static int crypto_xcbc_digest_init(struct shash_desc *pdesc)
|
2006-10-27 21:15:24 -06:00
|
|
|
{
|
2009-07-22 00:37:15 -06:00
|
|
|
unsigned long alignmask = crypto_shash_alignmask(pdesc->tfm);
|
|
|
|
struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
|
2009-07-11 22:48:32 -06:00
|
|
|
int bs = crypto_shash_blocksize(pdesc->tfm);
|
2009-07-22 00:37:15 -06:00
|
|
|
u8 *prev = PTR_ALIGN(&ctx->ctx[0], alignmask + 1) + bs;
|
2006-10-27 21:15:24 -06:00
|
|
|
|
|
|
|
ctx->len = 0;
|
2009-07-22 00:37:15 -06:00
|
|
|
memset(prev, 0, bs);
|
2006-10-27 21:15:24 -06:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2009-07-11 22:48:32 -06:00
|
|
|
static int crypto_xcbc_digest_update(struct shash_desc *pdesc, const u8 *p,
|
|
|
|
unsigned int len)
|
2006-10-27 21:15:24 -06:00
|
|
|
{
|
2009-07-11 22:48:32 -06:00
|
|
|
struct crypto_shash *parent = pdesc->tfm;
|
2009-07-22 00:37:15 -06:00
|
|
|
unsigned long alignmask = crypto_shash_alignmask(parent);
|
|
|
|
struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent);
|
|
|
|
struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
|
|
|
|
struct crypto_cipher *tfm = tctx->child;
|
2009-07-11 22:48:32 -06:00
|
|
|
int bs = crypto_shash_blocksize(parent);
|
2009-07-22 00:37:15 -06:00
|
|
|
u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1);
|
|
|
|
u8 *prev = odds + bs;
|
2009-07-11 22:48:32 -06:00
|
|
|
|
|
|
|
/* checking the data can fill the block */
|
|
|
|
if ((ctx->len + len) <= bs) {
|
2009-07-22 00:37:15 -06:00
|
|
|
memcpy(odds + ctx->len, p, len);
|
2009-07-11 22:48:32 -06:00
|
|
|
ctx->len += len;
|
|
|
|
return 0;
|
2008-04-02 00:36:09 -06:00
|
|
|
}
|
2006-10-27 21:15:24 -06:00
|
|
|
|
2009-07-11 22:48:32 -06:00
|
|
|
/* filling odds with new data and encrypting it */
|
2009-07-22 00:37:15 -06:00
|
|
|
memcpy(odds + ctx->len, p, bs - ctx->len);
|
2009-07-11 22:48:32 -06:00
|
|
|
len -= bs - ctx->len;
|
|
|
|
p += bs - ctx->len;
|
2006-10-27 21:15:24 -06:00
|
|
|
|
2009-07-22 00:37:15 -06:00
|
|
|
crypto_xor(prev, odds, bs);
|
|
|
|
crypto_cipher_encrypt_one(tfm, prev, prev);
|
2009-07-11 22:48:32 -06:00
|
|
|
|
|
|
|
/* clearing the length */
|
|
|
|
ctx->len = 0;
|
|
|
|
|
|
|
|
/* encrypting the rest of data */
|
|
|
|
while (len > bs) {
|
2009-07-22 00:37:15 -06:00
|
|
|
crypto_xor(prev, p, bs);
|
|
|
|
crypto_cipher_encrypt_one(tfm, prev, prev);
|
2009-07-11 22:48:32 -06:00
|
|
|
p += bs;
|
|
|
|
len -= bs;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* keeping the surplus of blocksize */
|
|
|
|
if (len) {
|
2009-07-22 00:37:15 -06:00
|
|
|
memcpy(odds, p, len);
|
2009-07-11 22:48:32 -06:00
|
|
|
ctx->len = len;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
2006-12-09 16:45:28 -07:00
|
|
|
}
|
|
|
|
|
2009-07-11 22:48:32 -06:00
|
|
|
static int crypto_xcbc_digest_final(struct shash_desc *pdesc, u8 *out)
|
2006-10-27 21:15:24 -06:00
|
|
|
{
|
2009-07-11 22:48:32 -06:00
|
|
|
struct crypto_shash *parent = pdesc->tfm;
|
2009-07-22 00:37:15 -06:00
|
|
|
unsigned long alignmask = crypto_shash_alignmask(parent);
|
|
|
|
struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent);
|
|
|
|
struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
|
|
|
|
struct crypto_cipher *tfm = tctx->child;
|
2009-07-11 22:48:32 -06:00
|
|
|
int bs = crypto_shash_blocksize(parent);
|
2009-07-22 00:37:15 -06:00
|
|
|
u8 *consts = PTR_ALIGN(&tctx->ctx[0], alignmask + 1);
|
|
|
|
u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1);
|
|
|
|
u8 *prev = odds + bs;
|
|
|
|
unsigned int offset = 0;
|
2006-10-27 21:15:24 -06:00
|
|
|
|
2009-07-22 00:37:15 -06:00
|
|
|
if (ctx->len != bs) {
|
2006-10-27 21:15:24 -06:00
|
|
|
unsigned int rlen;
|
2009-07-22 00:37:15 -06:00
|
|
|
u8 *p = odds + ctx->len;
|
|
|
|
|
2006-10-27 21:15:24 -06:00
|
|
|
*p = 0x80;
|
|
|
|
p++;
|
|
|
|
|
|
|
|
rlen = bs - ctx->len -1;
|
|
|
|
if (rlen)
|
|
|
|
memset(p, 0, rlen);
|
|
|
|
|
2009-07-22 00:37:15 -06:00
|
|
|
offset += bs;
|
|
|
|
}
|
2006-10-27 21:15:24 -06:00
|
|
|
|
2009-07-22 00:37:15 -06:00
|
|
|
crypto_xor(prev, odds, bs);
|
|
|
|
crypto_xor(prev, consts + offset, bs);
|
2006-10-27 21:15:24 -06:00
|
|
|
|
2009-07-22 00:37:15 -06:00
|
|
|
crypto_cipher_encrypt_one(tfm, out, prev);
|
2006-10-27 21:15:24 -06:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int xcbc_init_tfm(struct crypto_tfm *tfm)
|
|
|
|
{
|
2006-12-16 16:05:58 -07:00
|
|
|
struct crypto_cipher *cipher;
|
2006-10-27 21:15:24 -06:00
|
|
|
struct crypto_instance *inst = (void *)tfm->__crt_alg;
|
2020-01-02 20:59:05 -07:00
|
|
|
struct crypto_cipher_spawn *spawn = crypto_instance_ctx(inst);
|
2009-07-22 00:37:15 -06:00
|
|
|
struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
|
2006-10-27 21:15:24 -06:00
|
|
|
|
2006-12-16 16:05:58 -07:00
|
|
|
cipher = crypto_spawn_cipher(spawn);
|
|
|
|
if (IS_ERR(cipher))
|
|
|
|
return PTR_ERR(cipher);
|
2006-10-27 21:15:24 -06:00
|
|
|
|
2006-12-16 16:05:58 -07:00
|
|
|
ctx->child = cipher;
|
2006-10-27 21:15:24 -06:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
};
|
|
|
|
|
|
|
|
static void xcbc_exit_tfm(struct crypto_tfm *tfm)
|
|
|
|
{
|
2009-07-22 00:37:15 -06:00
|
|
|
struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
|
2006-10-27 21:15:24 -06:00
|
|
|
crypto_free_cipher(ctx->child);
|
|
|
|
}
|
|
|
|
|
2009-07-11 22:48:32 -06:00
|
|
|
static int xcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
|
2006-10-27 21:15:24 -06:00
|
|
|
{
|
2009-07-11 22:48:32 -06:00
|
|
|
struct shash_instance *inst;
|
2020-01-02 20:59:04 -07:00
|
|
|
struct crypto_cipher_spawn *spawn;
|
2006-10-27 21:15:24 -06:00
|
|
|
struct crypto_alg *alg;
|
2009-08-20 01:58:04 -06:00
|
|
|
unsigned long alignmask;
|
2007-01-01 00:37:02 -07:00
|
|
|
int err;
|
|
|
|
|
2009-07-11 22:48:32 -06:00
|
|
|
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
|
2007-01-01 00:37:02 -07:00
|
|
|
if (err)
|
2009-07-11 22:48:32 -06:00
|
|
|
return err;
|
2007-01-01 00:37:02 -07:00
|
|
|
|
2020-01-02 20:59:04 -07:00
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
|
|
|
|
if (!inst)
|
|
|
|
return -ENOMEM;
|
|
|
|
spawn = shash_instance_ctx(inst);
|
2006-10-27 21:15:24 -06:00
|
|
|
|
2020-01-02 20:59:04 -07:00
|
|
|
err = crypto_grab_cipher(spawn, shash_crypto_instance(inst),
|
|
|
|
crypto_attr_alg_name(tb[1]), 0, 0);
|
|
|
|
if (err)
|
|
|
|
goto err_free_inst;
|
|
|
|
alg = crypto_spawn_cipher_alg(spawn);
|
2006-10-27 21:15:24 -06:00
|
|
|
|
2020-01-02 20:59:04 -07:00
|
|
|
err = -EINVAL;
|
|
|
|
if (alg->cra_blocksize != XCBC_BLOCKSIZE)
|
|
|
|
goto err_free_inst;
|
2006-10-27 21:15:24 -06:00
|
|
|
|
2020-01-02 20:59:04 -07:00
|
|
|
err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg);
|
2009-07-11 22:48:32 -06:00
|
|
|
if (err)
|
2020-01-02 20:59:04 -07:00
|
|
|
goto err_free_inst;
|
2009-07-11 22:48:32 -06:00
|
|
|
|
2009-08-20 01:58:04 -06:00
|
|
|
alignmask = alg->cra_alignmask | 3;
|
|
|
|
inst->alg.base.cra_alignmask = alignmask;
|
2009-07-11 22:48:32 -06:00
|
|
|
inst->alg.base.cra_priority = alg->cra_priority;
|
|
|
|
inst->alg.base.cra_blocksize = alg->cra_blocksize;
|
|
|
|
|
|
|
|
inst->alg.digestsize = alg->cra_blocksize;
|
2009-07-22 00:37:15 -06:00
|
|
|
inst->alg.descsize = ALIGN(sizeof(struct xcbc_desc_ctx),
|
|
|
|
crypto_tfm_ctx_alignment()) +
|
2009-08-20 01:58:04 -06:00
|
|
|
(alignmask &
|
2009-07-22 00:37:15 -06:00
|
|
|
~(crypto_tfm_ctx_alignment() - 1)) +
|
|
|
|
alg->cra_blocksize * 2;
|
|
|
|
|
|
|
|
inst->alg.base.cra_ctxsize = ALIGN(sizeof(struct xcbc_tfm_ctx),
|
2009-08-20 01:58:04 -06:00
|
|
|
alignmask + 1) +
|
2009-07-22 00:37:15 -06:00
|
|
|
alg->cra_blocksize * 2;
|
2009-07-11 22:48:32 -06:00
|
|
|
inst->alg.base.cra_init = xcbc_init_tfm;
|
|
|
|
inst->alg.base.cra_exit = xcbc_exit_tfm;
|
|
|
|
|
|
|
|
inst->alg.init = crypto_xcbc_digest_init;
|
|
|
|
inst->alg.update = crypto_xcbc_digest_update;
|
|
|
|
inst->alg.final = crypto_xcbc_digest_final;
|
|
|
|
inst->alg.setkey = crypto_xcbc_digest_setkey;
|
|
|
|
|
2020-01-02 21:04:38 -07:00
|
|
|
inst->free = shash_free_singlespawn_instance;
|
|
|
|
|
2009-07-11 22:48:32 -06:00
|
|
|
err = shash_register_instance(tmpl, inst);
|
|
|
|
if (err) {
|
2020-01-02 20:59:04 -07:00
|
|
|
err_free_inst:
|
2020-01-02 21:04:38 -07:00
|
|
|
shash_free_singlespawn_instance(inst);
|
2009-07-11 22:48:32 -06:00
|
|
|
}
|
|
|
|
return err;
|
2006-10-27 21:15:24 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct crypto_template crypto_xcbc_tmpl = {
|
|
|
|
.name = "xcbc",
|
2009-07-11 22:48:32 -06:00
|
|
|
.create = xcbc_create,
|
2006-10-27 21:15:24 -06:00
|
|
|
.module = THIS_MODULE,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init crypto_xcbc_module_init(void)
|
|
|
|
{
|
|
|
|
return crypto_register_template(&crypto_xcbc_tmpl);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit crypto_xcbc_module_exit(void)
|
|
|
|
{
|
|
|
|
crypto_unregister_template(&crypto_xcbc_tmpl);
|
|
|
|
}
|
|
|
|
|
2019-04-11 22:57:42 -06:00
|
|
|
subsys_initcall(crypto_xcbc_module_init);
|
2006-10-27 21:15:24 -06:00
|
|
|
module_exit(crypto_xcbc_module_exit);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_DESCRIPTION("XCBC keyed hash algorithm");
|
2014-11-24 17:32:38 -07:00
|
|
|
MODULE_ALIAS_CRYPTO("xcbc");
|