[CRYPTO] xcbc: New algorithm
This is core code of XCBC. XCBC is an algorithm that forms a MAC algorithm out of a cipher algorithm. For example, AES-XCBC-MAC is a MAC algorithm based on the AES cipher algorithm. Signed-off-by: Kazunori MIYAZAWA <miyazawa@linux-ipv6.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Kazunori MIYAZAWA
David S. Miller
parent
45789328e5
commit
333b0d7eea
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@ -39,6 +39,17 @@ config CRYPTO_HMAC
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HMAC: Keyed-Hashing for Message Authentication (RFC2104).
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This is required for IPSec.
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config CRYPTO_XCBC
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tristate "XCBC support"
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depends on EXPERIMENTAL
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select CRYPTO_HASH
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select CRYPTO_MANAGER
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help
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XCBC: Keyed-Hashing with encryption algorithm
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http://www.ietf.org/rfc/rfc3566.txt
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http://csrc.nist.gov/encryption/modes/proposedmodes/
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xcbc-mac/xcbc-mac-spec.pdf
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config CRYPTO_NULL
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tristate "Null algorithms"
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select CRYPTO_ALGAPI
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@ -15,6 +15,7 @@ obj-$(CONFIG_CRYPTO_HASH) += crypto_hash.o
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obj-$(CONFIG_CRYPTO_MANAGER) += cryptomgr.o
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obj-$(CONFIG_CRYPTO_HMAC) += hmac.o
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obj-$(CONFIG_CRYPTO_XCBC) += xcbc.o
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obj-$(CONFIG_CRYPTO_NULL) += crypto_null.o
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obj-$(CONFIG_CRYPTO_MD4) += md4.o
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obj-$(CONFIG_CRYPTO_MD5) += md5.o
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@ -0,0 +1,346 @@
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/*
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* Copyright (C)2006 USAGI/WIDE Project
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author:
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* Kazunori Miyazawa <miyazawa@linux-ipv6.org>
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*/
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#include <linux/crypto.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/rtnetlink.h>
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#include <linux/slab.h>
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#include <linux/scatterlist.h>
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#include "internal.h"
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u_int32_t ks[12] = {0x01010101, 0x01010101, 0x01010101, 0x01010101,
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0x02020202, 0x02020202, 0x02020202, 0x02020202,
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0x03030303, 0x03030303, 0x03030303, 0x03030303};
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/*
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* +------------------------
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* | <parent tfm>
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* +------------------------
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* | crypto_xcbc_ctx
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* +------------------------
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* | odds (block size)
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* +------------------------
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* | prev (block size)
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* +------------------------
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* | key (block size)
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* +------------------------
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* | consts (block size * 3)
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* +------------------------
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*/
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struct crypto_xcbc_ctx {
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struct crypto_tfm *child;
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u8 *odds;
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u8 *prev;
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u8 *key;
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u8 *consts;
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void (*xor)(u8 *a, const u8 *b, unsigned int bs);
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unsigned int keylen;
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unsigned int len;
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};
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static void xor_128(u8 *a, const u8 *b, unsigned int bs)
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{
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((u32 *)a)[0] ^= ((u32 *)b)[0];
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((u32 *)a)[1] ^= ((u32 *)b)[1];
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((u32 *)a)[2] ^= ((u32 *)b)[2];
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((u32 *)a)[3] ^= ((u32 *)b)[3];
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}
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static int _crypto_xcbc_digest_setkey(struct crypto_hash *parent,
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struct crypto_xcbc_ctx *ctx)
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{
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int bs = crypto_hash_blocksize(parent);
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int err = 0;
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u8 key1[bs];
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if ((err = crypto_cipher_setkey(ctx->child, ctx->key, ctx->keylen)))
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return err;
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ctx->child->__crt_alg->cra_cipher.cia_encrypt(ctx->child, key1,
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ctx->consts);
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return crypto_cipher_setkey(ctx->child, key1, bs);
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}
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static int crypto_xcbc_digest_setkey(struct crypto_hash *parent,
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const u8 *inkey, unsigned int keylen)
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{
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struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
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if (keylen != crypto_tfm_alg_blocksize(ctx->child))
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return -EINVAL;
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ctx->keylen = keylen;
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memcpy(ctx->key, inkey, keylen);
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ctx->consts = (u8*)ks;
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return _crypto_xcbc_digest_setkey(parent, ctx);
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}
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int crypto_xcbc_digest_init(struct hash_desc *pdesc)
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{
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struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(pdesc->tfm);
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int bs = crypto_hash_blocksize(pdesc->tfm);
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ctx->len = 0;
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memset(ctx->odds, 0, bs);
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memset(ctx->prev, 0, bs);
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return 0;
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}
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int crypto_xcbc_digest_update(struct hash_desc *pdesc, struct scatterlist *sg, unsigned int nbytes)
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{
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struct crypto_hash *parent = pdesc->tfm;
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struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
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struct crypto_tfm *tfm = ctx->child;
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int bs = crypto_hash_blocksize(parent);
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unsigned int i = 0;
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do {
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struct page *pg = sg[i].page;
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unsigned int offset = sg[i].offset;
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unsigned int slen = sg[i].length;
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while (slen > 0) {
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unsigned int len = min(slen, ((unsigned int)(PAGE_SIZE)) - offset);
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char *p = crypto_kmap(pg, 0) + offset;
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/* checking the data can fill the block */
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if ((ctx->len + len) <= bs) {
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memcpy(ctx->odds + ctx->len, p, len);
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ctx->len += len;
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slen -= len;
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/* checking the rest of the page */
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if (len + offset >= PAGE_SIZE) {
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offset = 0;
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pg++;
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} else
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offset += len;
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crypto_kunmap(p, 0);
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crypto_yield(tfm->crt_flags);
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continue;
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}
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/* filling odds with new data and encrypting it */
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memcpy(ctx->odds + ctx->len, p, bs - ctx->len);
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len -= bs - ctx->len;
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p += bs - ctx->len;
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ctx->xor(ctx->prev, ctx->odds, bs);
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tfm->__crt_alg->cra_cipher.cia_encrypt(tfm, ctx->prev, ctx->prev);
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/* clearing the length */
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ctx->len = 0;
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/* encrypting the rest of data */
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while (len > bs) {
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ctx->xor(ctx->prev, p, bs);
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tfm->__crt_alg->cra_cipher.cia_encrypt(tfm, ctx->prev, ctx->prev);
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p += bs;
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len -= bs;
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}
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/* keeping the surplus of blocksize */
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if (len) {
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memcpy(ctx->odds, p, len);
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ctx->len = len;
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}
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crypto_kunmap(p, 0);
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crypto_yield(tfm->crt_flags);
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slen -= min(slen, ((unsigned int)(PAGE_SIZE)) - offset);
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offset = 0;
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pg++;
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}
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nbytes-=sg[i].length;
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i++;
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} while (nbytes>0);
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return 0;
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}
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int crypto_xcbc_digest_final(struct hash_desc *pdesc, u8 *out)
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{
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struct crypto_hash *parent = pdesc->tfm;
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struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
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struct crypto_tfm *tfm = ctx->child;
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int bs = crypto_hash_blocksize(parent);
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int err = 0;
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if (ctx->len == bs) {
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u8 key2[bs];
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if ((err = crypto_cipher_setkey(tfm, ctx->key, ctx->keylen)) != 0)
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return err;
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tfm->__crt_alg->cra_cipher.cia_encrypt(tfm, key2, (const u8*)(ctx->consts+bs));
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ctx->xor(ctx->prev, ctx->odds, bs);
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ctx->xor(ctx->prev, key2, bs);
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_crypto_xcbc_digest_setkey(parent, ctx);
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tfm->__crt_alg->cra_cipher.cia_encrypt(tfm, out, ctx->prev);
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} else {
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u8 key3[bs];
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unsigned int rlen;
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u8 *p = ctx->odds + ctx->len;
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*p = 0x80;
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p++;
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rlen = bs - ctx->len -1;
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if (rlen)
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memset(p, 0, rlen);
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if ((err = crypto_cipher_setkey(tfm, ctx->key, ctx->keylen)) != 0)
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return err;
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tfm->__crt_alg->cra_cipher.cia_encrypt(tfm, key3, (const u8*)(ctx->consts+bs*2));
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ctx->xor(ctx->prev, ctx->odds, bs);
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ctx->xor(ctx->prev, key3, bs);
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_crypto_xcbc_digest_setkey(parent, ctx);
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tfm->__crt_alg->cra_cipher.cia_encrypt(tfm, out, ctx->prev);
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}
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return 0;
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}
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static int crypto_xcbc_digest(struct hash_desc *pdesc,
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struct scatterlist *sg, unsigned int nbytes, u8 *out)
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{
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crypto_xcbc_digest_init(pdesc);
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crypto_xcbc_digest_update(pdesc, sg, nbytes);
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return crypto_xcbc_digest_final(pdesc, out);
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}
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static int xcbc_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_instance *inst = (void *)tfm->__crt_alg;
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struct crypto_spawn *spawn = crypto_instance_ctx(inst);
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struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(__crypto_hash_cast(tfm));
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int bs = crypto_hash_blocksize(__crypto_hash_cast(tfm));
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tfm = crypto_spawn_tfm(spawn);
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if (IS_ERR(tfm))
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return PTR_ERR(tfm);
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switch(bs) {
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case 16:
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ctx->xor = xor_128;
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break;
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default:
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return -EINVAL;
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}
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ctx->child = crypto_cipher_cast(tfm);
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ctx->odds = (u8*)(ctx+1);
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ctx->prev = ctx->odds + bs;
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ctx->key = ctx->prev + bs;
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return 0;
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};
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static void xcbc_exit_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(__crypto_hash_cast(tfm));
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crypto_free_cipher(ctx->child);
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}
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static struct crypto_instance *xcbc_alloc(void *param, unsigned int len)
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{
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struct crypto_instance *inst;
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struct crypto_alg *alg;
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alg = crypto_get_attr_alg(param, len, CRYPTO_ALG_TYPE_CIPHER,
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CRYPTO_ALG_TYPE_HASH_MASK | CRYPTO_ALG_ASYNC);
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if (IS_ERR(alg))
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return ERR_PTR(PTR_ERR(alg));
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switch(alg->cra_blocksize) {
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case 16:
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break;
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default:
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return ERR_PTR(PTR_ERR(alg));
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}
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inst = crypto_alloc_instance("xcbc", alg);
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if (IS_ERR(inst))
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goto out_put_alg;
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inst->alg.cra_flags = CRYPTO_ALG_TYPE_HASH;
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inst->alg.cra_priority = alg->cra_priority;
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inst->alg.cra_blocksize = alg->cra_blocksize;
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inst->alg.cra_alignmask = alg->cra_alignmask;
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inst->alg.cra_type = &crypto_hash_type;
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inst->alg.cra_hash.digestsize =
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(alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
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CRYPTO_ALG_TYPE_HASH ? alg->cra_hash.digestsize :
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alg->cra_blocksize;
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inst->alg.cra_ctxsize = sizeof(struct crypto_xcbc_ctx) +
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ALIGN(inst->alg.cra_blocksize * 3, sizeof(void *));
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inst->alg.cra_init = xcbc_init_tfm;
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inst->alg.cra_exit = xcbc_exit_tfm;
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inst->alg.cra_hash.init = crypto_xcbc_digest_init;
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inst->alg.cra_hash.update = crypto_xcbc_digest_update;
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inst->alg.cra_hash.final = crypto_xcbc_digest_final;
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inst->alg.cra_hash.digest = crypto_xcbc_digest;
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inst->alg.cra_hash.setkey = crypto_xcbc_digest_setkey;
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out_put_alg:
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crypto_mod_put(alg);
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return inst;
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}
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static void xcbc_free(struct crypto_instance *inst)
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{
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crypto_drop_spawn(crypto_instance_ctx(inst));
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kfree(inst);
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}
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static struct crypto_template crypto_xcbc_tmpl = {
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.name = "xcbc",
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.alloc = xcbc_alloc,
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.free = xcbc_free,
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.module = THIS_MODULE,
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};
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static int __init crypto_xcbc_module_init(void)
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{
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return crypto_register_template(&crypto_xcbc_tmpl);
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}
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static void __exit crypto_xcbc_module_exit(void)
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{
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crypto_unregister_template(&crypto_xcbc_tmpl);
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}
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module_init(crypto_xcbc_module_init);
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module_exit(crypto_xcbc_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("XCBC keyed hash algorithm");
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