1 /* ====================================================================
2 * Copyright (c) 2011 The OpenSSL Project. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
16 * 3. All advertising materials mentioning features or use of this
17 * software must display the following acknowledgment:
18 * "This product includes software developed by the OpenSSL Project
19 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
21 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
22 * endorse or promote products derived from this software without
23 * prior written permission. For written permission, please contact
24 * openssl-core@openssl.org.
26 * 5. Products derived from this software may not be called "OpenSSL"
27 * nor may "OpenSSL" appear in their names without prior written
28 * permission of the OpenSSL Project.
30 * 6. Redistributions of any form whatsoever must retain the following
32 * "This product includes software developed by the OpenSSL Project
33 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
35 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
36 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
38 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
41 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
42 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
45 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
46 * OF THE POSSIBILITY OF SUCH DAMAGE.
47 * ====================================================================
50 #include <openssl/crypto.h>
51 #include "modes_lcl.h"
61 int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, const unsigned char *iv,
62 const unsigned char *inp, unsigned char *out,
65 const union { long one; char little; } is_endian = {1};
66 union { u64 u[2]; u32 d[4]; u8 c[16]; } tweak, scratch;
69 if (len<16) return -1;
71 memcpy(tweak.c, iv, 16);
73 (*ctx->block2)(tweak.c,tweak.c,ctx->key2);
75 if (!enc && (len%16)) len-=16;
78 #if defined(STRICT_ALIGNMENT)
79 memcpy(scratch.c,inp,16);
80 scratch.u[0] ^= tweak.u[0];
81 scratch.u[1] ^= tweak.u[1];
83 scratch.u[0] = ((u64*)inp)[0]^tweak.u[0];
84 scratch.u[1] = ((u64*)inp)[1]^tweak.u[1];
86 (*ctx->block1)(scratch.c,scratch.c,ctx->key1);
87 scratch.u[0] ^= tweak.u[0];
88 scratch.u[1] ^= tweak.u[1];
89 memcpy(out,scratch.c,16);
96 if (is_endian.little) {
97 unsigned int carry,res;
99 res = 0x87&(((int)tweak.d[3])>>31);
100 carry = tweak.u[0]>>63;
101 tweak.u[0] = (tweak.u[0]<<1)^res;
102 tweak.u[1] = (tweak.u[1]<<1)|carry;
105 unsigned int carry,c;
107 for (carry=0,i=0;i<16;++i) {
109 tweak.c[i] = (c<<1)|carry;
112 tweak.c[0] ^= 0x87&(0-carry);
116 for (i=0;i<len;++i) {
118 out[i] = scratch.c[i];
121 scratch.u[0] ^= tweak.u[0];
122 scratch.u[1] ^= tweak.u[1];
123 (*ctx->block1)(scratch.c,scratch.c,ctx->key1);
124 scratch.u[0] ^= tweak.u[0];
125 scratch.u[1] ^= tweak.u[1];
126 memcpy(out-16,scratch.c,16);
129 union { u64 u[2]; u8 c[16]; } tweak1;
131 if (is_endian.little) {
132 unsigned int carry,res;
134 res = 0x87&(((int)tweak.d[3])>>31);
135 carry = tweak.u[0]>>63;
136 tweak1.u[0] = (tweak.u[0]<<1)^res;
137 tweak1.u[1] = (tweak.u[1]<<1)|carry;
140 unsigned int carry,c;
142 for (carry=0,i=0;i<16;++i) {
144 tweak1.c[i] = (c<<1)|carry;
147 tweak1.c[0] ^= 0x87&(0-carry);
149 #if defined(STRICT_ALIGNMENT)
150 memcpy(scratch.c,inp,16);
151 scratch.u[0] ^= tweak1.u[0];
152 scratch.u[1] ^= tweak1.u[1];
154 scratch.u[0] = ((u64*)inp)[0]^tweak1.u[0];
155 scratch.u[1] = ((u64*)inp)[1]^tweak1.u[1];
157 (*ctx->block1)(scratch.c,scratch.c,ctx->key1);
158 scratch.u[0] ^= tweak1.u[0];
159 scratch.u[1] ^= tweak1.u[1];
161 for (i=0;i<len;++i) {
163 out[16+i] = scratch.c[i];
166 scratch.u[0] ^= tweak.u[0];
167 scratch.u[1] ^= tweak.u[1];
168 (*ctx->block1)(scratch.c,scratch.c,ctx->key1);
169 scratch.u[0] ^= tweak.u[0];
170 scratch.u[1] ^= tweak.u[1];
171 memcpy (out,scratch.c,16);