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xts128.c

Absolute File Name:/home/opencoverage/opencoverage/guest-scripts/libressl/src/crypto/modes/xts128.c
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1/* $OpenBSD: xts128.c,v 1.7 2017/08/13 17:46:24 bcook Exp $ */-
2/* ====================================================================-
3 * Copyright (c) 2011 The OpenSSL Project. All rights reserved.-
4 *-
5 * Redistribution and use in source and binary forms, with or without-
6 * modification, are permitted provided that the following conditions-
7 * are met:-
8 *-
9 * 1. Redistributions of source code must retain the above copyright-
10 * notice, this list of conditions and the following disclaimer. -
11 *-
12 * 2. Redistributions in binary form must reproduce the above copyright-
13 * notice, this list of conditions and the following disclaimer in-
14 * the documentation and/or other materials provided with the-
15 * distribution.-
16 *-
17 * 3. All advertising materials mentioning features or use of this-
18 * software must display the following acknowledgment:-
19 * "This product includes software developed by the OpenSSL Project-
20 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"-
21 *-
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to-
23 * endorse or promote products derived from this software without-
24 * prior written permission. For written permission, please contact-
25 * openssl-core@openssl.org.-
26 *-
27 * 5. Products derived from this software may not be called "OpenSSL"-
28 * nor may "OpenSSL" appear in their names without prior written-
29 * permission of the OpenSSL Project.-
30 *-
31 * 6. Redistributions of any form whatsoever must retain the following-
32 * acknowledgment:-
33 * "This product includes software developed by the OpenSSL Project-
34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"-
35 *-
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY-
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE-
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR-
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR-
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,-
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT-
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;-
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)-
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,-
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)-
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED-
47 * OF THE POSSIBILITY OF SUCH DAMAGE.-
48 * ====================================================================-
49 */-
50-
51#include <machine/endian.h>-
52#include <openssl/crypto.h>-
53#include "modes_lcl.h"-
54#include <string.h>-
55-
56#ifndef MODES_DEBUG-
57# ifndef NDEBUG-
58# define NDEBUG-
59# endif-
60#endif-
61-
62int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, const unsigned char iv[16],-
63 const unsigned char *inp, unsigned char *out,-
64 size_t len, int enc)-
65{-
66 union { u64 u[2]; u32 d[4]; u8 c[16]; } tweak, scratch;-
67 unsigned int i;-
68-
69 if (len<16) return -1;
never executed: return -1;
len<16Description
TRUEnever evaluated
FALSEnever evaluated
0
70-
71 memcpy(tweak.c, iv, 16);-
72-
73 (*ctx->block2)(tweak.c,tweak.c,ctx->key2);-
74-
75 if (!enc && (len%16)) len-=16;
never executed: len-=16;
!encDescription
TRUEnever evaluated
FALSEnever evaluated
(len%16)Description
TRUEnever evaluated
FALSEnever evaluated
0
76-
77 while (len>=16) {
len>=16Description
TRUEnever evaluated
FALSEnever evaluated
0
78#ifdef __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 scratch.u[0] = ((u64*)inp)[0]^tweak.u[0];-
84 scratch.u[1] = ((u64*)inp)[1]^tweak.u[1];-
85#endif-
86 (*ctx->block1)(scratch.c,scratch.c,ctx->key1);-
87#ifdef __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 ((u64*)out)[0] = scratch.u[0]^=tweak.u[0];-
93 ((u64*)out)[1] = scratch.u[1]^=tweak.u[1];-
94#endif-
95 inp += 16;-
96 out += 16;-
97 len -= 16;-
98-
99 if (len==0) return 0;
never executed: return 0;
len==0Description
TRUEnever evaluated
FALSEnever evaluated
0
100-
101#if BYTE_ORDER == LITTLE_ENDIAN-
102 unsigned int carry,res;-
103-
104 res = 0x87&(((int)tweak.d[3])>>31);-
105 carry = (unsigned int)(tweak.u[0]>>63);-
106 tweak.u[0] = (tweak.u[0]<<1)^res;-
107 tweak.u[1] = (tweak.u[1]<<1)|carry;-
108#else /* BIG_ENDIAN */-
109 size_t c;-
110-
111 for (c=0,i=0;i<16;++i) {-
112 /*+ substitutes for |, because c is 1 bit */-
113 c += ((size_t)tweak.c[i])<<1;-
114 tweak.c[i] = (u8)c;-
115 c = c>>8;-
116 }-
117 tweak.c[0] ^= (u8)(0x87&(0-c));-
118#endif-
119 }
never executed: end of block
0
120 if (enc) {
encDescription
TRUEnever evaluated
FALSEnever evaluated
0
121 for (i=0;i<len;++i) {
i<lenDescription
TRUEnever evaluated
FALSEnever evaluated
0
122 u8 c = inp[i];-
123 out[i] = scratch.c[i];-
124 scratch.c[i] = c;-
125 }
never executed: end of block
0
126 scratch.u[0] ^= tweak.u[0];-
127 scratch.u[1] ^= tweak.u[1];-
128 (*ctx->block1)(scratch.c,scratch.c,ctx->key1);-
129 scratch.u[0] ^= tweak.u[0];-
130 scratch.u[1] ^= tweak.u[1];-
131 memcpy(out-16,scratch.c,16);-
132 }
never executed: end of block
0
133 else {-
134 union { u64 u[2]; u8 c[16]; } tweak1;-
135-
136#if BYTE_ORDER == LITTLE_ENDIAN-
137 unsigned int carry,res;-
138-
139 res = 0x87&(((int)tweak.d[3])>>31);-
140 carry = (unsigned int)(tweak.u[0]>>63);-
141 tweak1.u[0] = (tweak.u[0]<<1)^res;-
142 tweak1.u[1] = (tweak.u[1]<<1)|carry;-
143#else-
144 size_t c;-
145-
146 for (c=0,i=0;i<16;++i) {-
147 /*+ substitutes for |, because c is 1 bit */-
148 c += ((size_t)tweak.c[i])<<1;-
149 tweak1.c[i] = (u8)c;-
150 c = c>>8;-
151 }-
152 tweak1.c[0] ^= (u8)(0x87&(0-c));-
153#endif-
154#ifdef __STRICT_ALIGNMENT-
155 memcpy(scratch.c,inp,16);-
156 scratch.u[0] ^= tweak1.u[0];-
157 scratch.u[1] ^= tweak1.u[1];-
158#else-
159 scratch.u[0] = ((u64*)inp)[0]^tweak1.u[0];-
160 scratch.u[1] = ((u64*)inp)[1]^tweak1.u[1];-
161#endif-
162 (*ctx->block1)(scratch.c,scratch.c,ctx->key1);-
163 scratch.u[0] ^= tweak1.u[0];-
164 scratch.u[1] ^= tweak1.u[1];-
165-
166 for (i=0;i<len;++i) {
i<lenDescription
TRUEnever evaluated
FALSEnever evaluated
0
167 u8 c = inp[16+i];-
168 out[16+i] = scratch.c[i];-
169 scratch.c[i] = c;-
170 }
never executed: end of block
0
171 scratch.u[0] ^= tweak.u[0];-
172 scratch.u[1] ^= tweak.u[1];-
173 (*ctx->block1)(scratch.c,scratch.c,ctx->key1);-
174#ifdef __STRICT_ALIGNMENT-
175 scratch.u[0] ^= tweak.u[0];-
176 scratch.u[1] ^= tweak.u[1];-
177 memcpy (out,scratch.c,16);-
178#else-
179 ((u64*)out)[0] = scratch.u[0]^tweak.u[0];-
180 ((u64*)out)[1] = scratch.u[1]^tweak.u[1];-
181#endif-
182 }
never executed: end of block
0
183-
184 return 0;
never executed: return 0;
0
185}-
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