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1 : : /* ====================================================================
2 : : * Copyright (c) 2011 The OpenSSL Project. All rights reserved.
3 : : *
4 : : * Redistribution and use in source and binary forms, with or without
5 : : * modification, are permitted provided that the following conditions
6 : : * are met:
7 : : *
8 : : * 1. Redistributions of source code must retain the above copyright
9 : : * notice, this list of conditions and the following disclaimer.
10 : : *
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
14 : : * distribution.
15 : : *
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/)"
20 : : *
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.
25 : : *
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.
29 : : *
30 : : * 6. Redistributions of any form whatsoever must retain the following
31 : : * acknowledgment:
32 : : * "This product includes software developed by the OpenSSL Project
33 : : * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
34 : : *
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 : : * ====================================================================
48 : : */
49 : :
50 : : #include <openssl/crypto.h>
51 : : #include "modes_lcl.h"
52 : : #include <string.h>
53 : :
54 : : #ifndef MODES_DEBUG
55 : : # ifndef NDEBUG
56 : : # define NDEBUG
57 : : # endif
58 : : #endif
59 : : #include <assert.h>
60 : :
61 : 0 : int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, const unsigned char iv[16],
62 : : const unsigned char *inp, unsigned char *out,
63 : : size_t len, int enc)
64 : : {
65 : : const union { long one; char little; } is_endian = {1};
66 : : union { u64 u[2]; u32 d[4]; u8 c[16]; } tweak, scratch;
67 : : unsigned int i;
68 : :
69 [ # # ]: 0 : if (len<16) return -1;
70 : :
71 : : memcpy(tweak.c, iv, 16);
72 : :
73 : 0 : (*ctx->block2)(tweak.c,tweak.c,ctx->key2);
74 : :
75 [ # # ][ # # ]: 0 : if (!enc && (len%16)) len-=16;
76 : :
77 [ # # ]: 0 : while (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];
82 : : #else
83 : 0 : scratch.u[0] = ((u64*)inp)[0]^tweak.u[0];
84 : 0 : scratch.u[1] = ((u64*)inp)[1]^tweak.u[1];
85 : : #endif
86 : 0 : (*ctx->block1)(scratch.c,scratch.c,ctx->key1);
87 : : #if defined(STRICT_ALIGNMENT)
88 : : scratch.u[0] ^= tweak.u[0];
89 : : scratch.u[1] ^= tweak.u[1];
90 : : memcpy(out,scratch.c,16);
91 : : #else
92 : 0 : ((u64*)out)[0] = scratch.u[0]^=tweak.u[0];
93 : 0 : ((u64*)out)[1] = scratch.u[1]^=tweak.u[1];
94 : : #endif
95 : 0 : inp += 16;
96 : 0 : out += 16;
97 : 0 : len -= 16;
98 : :
99 [ # # ]: 0 : if (len==0) return 0;
100 : :
101 : : if (is_endian.little) {
102 : : unsigned int carry,res;
103 : :
104 : 0 : res = 0x87&(((int)tweak.d[3])>>31);
105 : 0 : carry = (unsigned int)(tweak.u[0]>>63);
106 : 0 : tweak.u[0] = (tweak.u[0]<<1)^res;
107 : 0 : tweak.u[1] = (tweak.u[1]<<1)|carry;
108 : : }
109 : : else {
110 : : size_t c;
111 : :
112 : : for (c=0,i=0;i<16;++i) {
113 : : /*+ substitutes for |, because c is 1 bit */
114 : : c += ((size_t)tweak.c[i])<<1;
115 : : tweak.c[i] = (u8)c;
116 : : c = c>>8;
117 : : }
118 : : tweak.c[0] ^= (u8)(0x87&(0-c));
119 : : }
120 : : }
121 [ # # ]: 0 : if (enc) {
122 [ # # ]: 0 : for (i=0;i<len;++i) {
123 : 0 : u8 c = inp[i];
124 : 0 : out[i] = scratch.c[i];
125 : 0 : scratch.c[i] = c;
126 : : }
127 : 0 : scratch.u[0] ^= tweak.u[0];
128 : 0 : scratch.u[1] ^= tweak.u[1];
129 : 0 : (*ctx->block1)(scratch.c,scratch.c,ctx->key1);
130 : 0 : scratch.u[0] ^= tweak.u[0];
131 : 0 : scratch.u[1] ^= tweak.u[1];
132 : 0 : memcpy(out-16,scratch.c,16);
133 : : }
134 : : else {
135 : : union { u64 u[2]; u8 c[16]; } tweak1;
136 : :
137 : : if (is_endian.little) {
138 : : unsigned int carry,res;
139 : :
140 : 0 : res = 0x87&(((int)tweak.d[3])>>31);
141 : 0 : carry = (unsigned int)(tweak.u[0]>>63);
142 : 0 : tweak1.u[0] = (tweak.u[0]<<1)^res;
143 : 0 : tweak1.u[1] = (tweak.u[1]<<1)|carry;
144 : : }
145 : : else {
146 : : size_t c;
147 : :
148 : : for (c=0,i=0;i<16;++i) {
149 : : /*+ substitutes for |, because c is 1 bit */
150 : : c += ((size_t)tweak.c[i])<<1;
151 : : tweak1.c[i] = (u8)c;
152 : : c = c>>8;
153 : : }
154 : : tweak1.c[0] ^= (u8)(0x87&(0-c));
155 : : }
156 : : #if defined(STRICT_ALIGNMENT)
157 : : memcpy(scratch.c,inp,16);
158 : : scratch.u[0] ^= tweak1.u[0];
159 : : scratch.u[1] ^= tweak1.u[1];
160 : : #else
161 : 0 : scratch.u[0] = ((u64*)inp)[0]^tweak1.u[0];
162 : 0 : scratch.u[1] = ((u64*)inp)[1]^tweak1.u[1];
163 : : #endif
164 : 0 : (*ctx->block1)(scratch.c,scratch.c,ctx->key1);
165 : 0 : scratch.u[0] ^= tweak1.u[0];
166 : 0 : scratch.u[1] ^= tweak1.u[1];
167 : :
168 [ # # ]: 0 : for (i=0;i<len;++i) {
169 : 0 : u8 c = inp[16+i];
170 : 0 : out[16+i] = scratch.c[i];
171 : 0 : scratch.c[i] = c;
172 : : }
173 : 0 : scratch.u[0] ^= tweak.u[0];
174 : 0 : scratch.u[1] ^= tweak.u[1];
175 : 0 : (*ctx->block1)(scratch.c,scratch.c,ctx->key1);
176 : : #if defined(STRICT_ALIGNMENT)
177 : : scratch.u[0] ^= tweak.u[0];
178 : : scratch.u[1] ^= tweak.u[1];
179 : : memcpy (out,scratch.c,16);
180 : : #else
181 : 0 : ((u64*)out)[0] = scratch.u[0]^tweak.u[0];
182 : 0 : ((u64*)out)[1] = scratch.u[1]^tweak.u[1];
183 : : #endif
184 : : }
185 : :
186 : : return 0;
187 : : }
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