xts128.c: initial draft.
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Andy Polyakov
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1 changed files with 189 additions and 0 deletions
189
crypto/modes/xts128.c
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189
crypto/modes/xts128.c
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/* ====================================================================
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* Copyright (c) 2011 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*/
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#include <openssl/crypto.h>
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#include "modes_lcl.h"
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#include <string.h>
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#ifndef MODES_DEBUG
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# ifndef NDEBUG
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# define NDEBUG
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# endif
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#endif
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#include <assert.h>
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typedef struct {
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void *key1, *key2;
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block128_f block1,block2;
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} XTS128_CONTEXT;
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int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, u64 secno,
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const unsigned char *inp, unsigned char *out,
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size_t len, int enc)
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{
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const union { long one; char little; } is_endian = {1};
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union { u64 u[2]; u32 d[4]; u8 c[16]; } tweak, scratch;
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if (len<16) return -1;
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if (is_endian.little) {
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tweak.u[0] = secno;
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tweak.u[1] = 0;
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}
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else {
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PUTU32(tweak.c,secno);
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PUTU32(tweak.c+4,secno>>32);
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tweak.u[1] = 0;
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}
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(*ctx->block2)(tweak.c,tweak.c,ctx->key2);
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if (!enc && len%16) len-=16;
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while (len>=16) {
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#if defined(STRICT_ALIGNMENT)
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memcpy(scratch.c,inp,16);
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scratch.u[0] ^= tweak.u[0];
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scratch.u[1] ^= tweak.u[1];
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#else
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scratch.u[0] = ((u64*)inp)[0]^tweak.u[0];
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scratch.u[1] = ((u64*)inp)[1]^tweak.u[1];
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#endif
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(*ctx->block1)(scratch.c,scratch.c,ctx->key1);
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scratch.u[0] ^= tweak.u[0];
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scratch.u[1] ^= tweak.u[1];
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memcpy(out,scratch.c,16);
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inp += 16;
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out += 16;
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len -= 16;
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if (is_endian.little) {
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unsigned int carry,res;
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res = 0x87&(((int)tweak.d[3])>>31);
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carry = tweak.u[0]>>63;
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tweak.u[0] = (tweak.u[0]<<1)^res;
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tweak.u[1] = (tweak.u[1]<<1)|carry;
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}
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else {
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unsigned int carry,c,i;
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for (carry=0,i=0;i<16;++i) {
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c = tweak.c[i];
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tweak.c[i] = (c<<1)|carry;
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carry = c>>7;
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}
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tweak.c[0] ^= 0x87&(0-carry);
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}
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}
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if (len) {
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unsigned int i;
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if (enc) {
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for (i=0;i<len;++i) {
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u8 c = inp[i];
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out[i] = scratch.c[i];
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scratch.c[i] = c;
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}
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scratch.u[0] ^= tweak.u[0];
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scratch.u[1] ^= tweak.u[1];
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(*ctx->block1)(scratch.c,scratch.c,ctx->key1);
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scratch.u[0] ^= tweak.u[0];
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scratch.u[1] ^= tweak.u[1];
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memcpy(out-16,scratch.c,16);
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}
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else {
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union { u64 u[2]; u8 c[16]; } tweak1;
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if (is_endian.little) {
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unsigned int carry,res;
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res = 0x87&(((int)tweak.d[3])>>31);
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carry = tweak.u[0]>>63;
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tweak1.u[0] = (tweak.u[0]<<1)^res;
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tweak1.u[1] = (tweak.u[1]<<1)|carry;
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}
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else {
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unsigned int carry,c;
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for (carry=0,i=0;i<16;++i) {
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c = tweak.c[i];
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tweak1.c[i] = (c<<1)|carry;
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carry = c>>7;
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}
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tweak1.c[0] ^= 0x87&(0-carry);
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}
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#if defined(STRICT_ALIGNMENT)
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memcpy(scratch.c,inp,16);
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scratch.u[0] ^= tweak1.u[0];
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scratch.u[1] ^= tweak1.u[1];
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#else
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scratch.u[0] = ((u64*)inp)[0]^tweak1.u[0];
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scratch.u[1] = ((u64*)inp)[1]^tweak1.u[1];
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#endif
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(*ctx->block1)(scratch.c,scratch.c,ctx->key1);
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scratch.u[0] ^= tweak1.u[0];
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scratch.u[1] ^= tweak1.u[1];
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for (i=0;i<len;++i) {
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u8 c = inp[16+i];
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out[16+i] = scratch.c[i];
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scratch.c[i] = c;
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}
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scratch.u[0] ^= tweak.u[0];
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scratch.u[1] ^= tweak.u[1];
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(*ctx->block1)(scratch.c,scratch.c,ctx->key1);
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scratch.u[0] ^= tweak.u[0];
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scratch.u[1] ^= tweak.u[1];
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memcpy (out,scratch.c,16);
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}
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}
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return 0;
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}
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