GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/modes/xts128.c Lines: 0 49 0.0 %
Date: 2017-11-13 Branches: 0 16 0.0 %

Line Branch Exec Source
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
62
int 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;
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;
76
77
	while (len>=16) {
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;
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
	}
120
	if (enc) {
121
		for (i=0;i<len;++i) {
122
			u8 c = inp[i];
123
			out[i] = scratch.c[i];
124
			scratch.c[i] = c;
125
		}
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
	}
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) {
167
			u8 c = inp[16+i];
168
			out[16+i] = scratch.c[i];
169
			scratch.c[i] = c;
170
		}
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
	}
183
184
	return 0;
185
}