freebsd-dev/sys/opencrypto/xform_aes_icm.c
John Baldwin 821fe3d3a4 Use 'const' for keys and IVs passed to software encryption algorithms.
Specifically, use 'const' for the key passed to the 'setkey' method
and 'const' for the 'iv' passed to the 'reinit' method.

Reviewed by:	cem
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D21347
2019-08-22 00:02:08 +00:00

181 lines
4.9 KiB
C

/* $OpenBSD: xform.c,v 1.16 2001/08/28 12:20:43 ben Exp $ */
/*-
* The authors of this code are John Ioannidis (ji@tla.org),
* Angelos D. Keromytis (kermit@csd.uch.gr),
* Niels Provos (provos@physnet.uni-hamburg.de) and
* Damien Miller (djm@mindrot.org).
*
* This code was written by John Ioannidis for BSD/OS in Athens, Greece,
* in November 1995.
*
* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
* by Angelos D. Keromytis.
*
* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
* and Niels Provos.
*
* Additional features in 1999 by Angelos D. Keromytis.
*
* AES XTS implementation in 2008 by Damien Miller
*
* Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
* Angelos D. Keromytis and Niels Provos.
*
* Copyright (C) 2001, Angelos D. Keromytis.
*
* Copyright (C) 2008, Damien Miller
* Copyright (c) 2014 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by John-Mark Gurney
* under sponsorship of the FreeBSD Foundation and
* Rubicon Communications, LLC (Netgate).
*
* Permission to use, copy, and modify this software with or without fee
* is hereby granted, provided that this entire notice is included in
* all copies of any software which is or includes a copy or
* modification of this software.
* You may use this code under the GNU public license if you so wish. Please
* contribute changes back to the authors under this freer than GPL license
* so that we may further the use of strong encryption without limitations to
* all.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <opencrypto/xform_enc.h>
static int aes_icm_setkey(u_int8_t **, const u_int8_t *, int);
static void aes_icm_crypt(caddr_t, u_int8_t *);
static void aes_icm_zerokey(u_int8_t **);
static void aes_icm_reinit(caddr_t, const u_int8_t *);
static void aes_gcm_reinit(caddr_t, const u_int8_t *);
static void aes_ccm_reinit(caddr_t, const u_int8_t *);
/* Encryption instances */
struct enc_xform enc_xform_aes_icm = {
CRYPTO_AES_ICM, "AES-ICM",
AES_BLOCK_LEN, AES_BLOCK_LEN, AES_MIN_KEY, AES_MAX_KEY,
aes_icm_crypt,
aes_icm_crypt,
aes_icm_setkey,
aes_icm_zerokey,
aes_icm_reinit,
};
struct enc_xform enc_xform_aes_nist_gcm = {
CRYPTO_AES_NIST_GCM_16, "AES-GCM",
AES_ICM_BLOCK_LEN, AES_GCM_IV_LEN, AES_MIN_KEY, AES_MAX_KEY,
aes_icm_crypt,
aes_icm_crypt,
aes_icm_setkey,
aes_icm_zerokey,
aes_gcm_reinit,
};
struct enc_xform enc_xform_ccm = {
.type = CRYPTO_AES_CCM_16,
.name = "AES-CCM",
.blocksize = AES_ICM_BLOCK_LEN, .ivsize = AES_CCM_IV_LEN,
.minkey = AES_MIN_KEY, .maxkey = AES_MAX_KEY,
.encrypt = aes_icm_crypt,
.decrypt = aes_icm_crypt,
.setkey = aes_icm_setkey,
.zerokey = aes_icm_zerokey,
.reinit = aes_ccm_reinit,
};
/*
* Encryption wrapper routines.
*/
static void
aes_icm_reinit(caddr_t key, const u_int8_t *iv)
{
struct aes_icm_ctx *ctx;
ctx = (struct aes_icm_ctx *)key;
bcopy(iv, ctx->ac_block, AESICM_BLOCKSIZE);
}
static void
aes_gcm_reinit(caddr_t key, const u_int8_t *iv)
{
struct aes_icm_ctx *ctx;
aes_icm_reinit(key, iv);
ctx = (struct aes_icm_ctx *)key;
/* GCM starts with 2 as counter 1 is used for final xor of tag. */
bzero(&ctx->ac_block[AESICM_BLOCKSIZE - 4], 4);
ctx->ac_block[AESICM_BLOCKSIZE - 1] = 2;
}
static void
aes_ccm_reinit(caddr_t key, const u_int8_t *iv)
{
struct aes_icm_ctx *ctx;
ctx = (struct aes_icm_ctx*)key;
/* CCM has flags, then the IV, then the counter, which starts at 1 */
bzero(ctx->ac_block, sizeof(ctx->ac_block));
/* 3 bytes for length field; this gives a nonce of 12 bytes */
ctx->ac_block[0] = (15 - AES_CCM_IV_LEN) - 1;
bcopy(iv, ctx->ac_block+1, AES_CCM_IV_LEN);
ctx->ac_block[AESICM_BLOCKSIZE - 1] = 1;
}
static void
aes_icm_crypt(caddr_t key, u_int8_t *data)
{
struct aes_icm_ctx *ctx;
u_int8_t keystream[AESICM_BLOCKSIZE];
int i;
ctx = (struct aes_icm_ctx *)key;
rijndaelEncrypt(ctx->ac_ek, ctx->ac_nr, ctx->ac_block, keystream);
for (i = 0; i < AESICM_BLOCKSIZE; i++)
data[i] ^= keystream[i];
explicit_bzero(keystream, sizeof(keystream));
/* increment counter */
for (i = AESICM_BLOCKSIZE - 1;
i >= 0; i--)
if (++ctx->ac_block[i]) /* continue on overflow */
break;
}
static int
aes_icm_setkey(u_int8_t **sched, const u_int8_t *key, int len)
{
struct aes_icm_ctx *ctx;
if (len != 16 && len != 24 && len != 32)
return EINVAL;
*sched = KMALLOC(sizeof(struct aes_icm_ctx), M_CRYPTO_DATA,
M_NOWAIT | M_ZERO);
if (*sched == NULL)
return ENOMEM;
ctx = (struct aes_icm_ctx *)*sched;
ctx->ac_nr = rijndaelKeySetupEnc(ctx->ac_ek, key, len * 8);
return 0;
}
static void
aes_icm_zerokey(u_int8_t **sched)
{
bzero(*sched, sizeof(struct aes_icm_ctx));
KFREE(*sched, M_CRYPTO_DATA);
*sched = NULL;
}