171 lines
5.0 KiB
C
171 lines
5.0 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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#include <sys/types.h>
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#include <crypto/camellia/camellia.h>
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#include <opencrypto/xform_enc.h>
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struct camellia_cbc_ctx {
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camellia_ctx state;
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char iv[CAMELLIA_BLOCK_LEN];
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};
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static int cml_setkey(void *, const uint8_t *, int);
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static void cml_encrypt(void *, const uint8_t *, uint8_t *);
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static void cml_decrypt(void *, const uint8_t *, uint8_t *);
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static void cml_encrypt_multi(void *, const uint8_t *, uint8_t *, size_t);
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static void cml_decrypt_multi(void *, const uint8_t *, uint8_t *, size_t);
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static void cml_reinit(void *, const uint8_t *, size_t);
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/* Encryption instances */
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const struct enc_xform enc_xform_camellia = {
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.type = CRYPTO_CAMELLIA_CBC,
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.name = "Camellia-CBC",
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.ctxsize = sizeof(struct camellia_cbc_ctx),
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.blocksize = CAMELLIA_BLOCK_LEN,
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.ivsize = CAMELLIA_BLOCK_LEN,
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.minkey = CAMELLIA_MIN_KEY,
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.maxkey = CAMELLIA_MAX_KEY,
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.setkey = cml_setkey,
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.reinit = cml_reinit,
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.encrypt = cml_encrypt,
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.decrypt = cml_decrypt,
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.encrypt_multi = cml_encrypt_multi,
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.decrypt_multi = cml_decrypt_multi,
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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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cml_encrypt(void *vctx, const uint8_t *in, uint8_t *out)
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{
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struct camellia_cbc_ctx *ctx = vctx;
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for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++)
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out[i] = in[i] ^ ctx->iv[i];
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camellia_encrypt(&ctx->state, out, out);
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memcpy(ctx->iv, out, CAMELLIA_BLOCK_LEN);
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}
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static void
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cml_decrypt(void *vctx, const uint8_t *in, uint8_t *out)
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{
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struct camellia_cbc_ctx *ctx = vctx;
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char block[CAMELLIA_BLOCK_LEN];
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memcpy(block, in, CAMELLIA_BLOCK_LEN);
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camellia_decrypt(&ctx->state, in, out);
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for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++)
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out[i] ^= ctx->iv[i];
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memcpy(ctx->iv, block, CAMELLIA_BLOCK_LEN);
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explicit_bzero(block, sizeof(block));
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}
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static void
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cml_encrypt_multi(void *vctx, const uint8_t *in, uint8_t *out, size_t len)
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{
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struct camellia_cbc_ctx *ctx = vctx;
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KASSERT(len % CAMELLIA_BLOCK_LEN == 0, ("%s: invalid length",
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__func__));
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while (len > 0) {
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for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++)
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out[i] = in[i] ^ ctx->iv[i];
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camellia_encrypt(&ctx->state, out, out);
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memcpy(ctx->iv, out, CAMELLIA_BLOCK_LEN);
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out += CAMELLIA_BLOCK_LEN;
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in += CAMELLIA_BLOCK_LEN;
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len -= CAMELLIA_BLOCK_LEN;
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}
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}
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static void
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cml_decrypt_multi(void *vctx, const uint8_t *in, uint8_t *out, size_t len)
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{
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struct camellia_cbc_ctx *ctx = vctx;
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char block[CAMELLIA_BLOCK_LEN];
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KASSERT(len % CAMELLIA_BLOCK_LEN == 0, ("%s: invalid length",
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__func__));
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while (len > 0) {
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memcpy(block, in, CAMELLIA_BLOCK_LEN);
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camellia_decrypt(&ctx->state, in, out);
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for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++)
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out[i] ^= ctx->iv[i];
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memcpy(ctx->iv, block, CAMELLIA_BLOCK_LEN);
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out += CAMELLIA_BLOCK_LEN;
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in += CAMELLIA_BLOCK_LEN;
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len -= CAMELLIA_BLOCK_LEN;
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}
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explicit_bzero(block, sizeof(block));
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}
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static int
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cml_setkey(void *vctx, const uint8_t *key, int len)
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{
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struct camellia_cbc_ctx *ctx = vctx;
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if (len != 16 && len != 24 && len != 32)
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return (EINVAL);
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camellia_set_key(&ctx->state, key, len * 8);
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return (0);
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}
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static void
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cml_reinit(void *vctx, const uint8_t *iv, size_t iv_len)
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{
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struct camellia_cbc_ctx *ctx = vctx;
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KASSERT(iv_len == sizeof(ctx->iv), ("%s: bad IV length", __func__));
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memcpy(ctx->iv, iv, sizeof(ctx->iv));
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}
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