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