OpenCoverage

xts128.c

Absolute File Name:/home/opencoverage/opencoverage/guest-scripts/openssl/src/crypto/modes/xts128.c
Source codeSwitch to Preprocessed file
LineSourceCount
1/*-
2 * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.-
3 *-
4 * Licensed under the OpenSSL license (the "License"). You may not use-
5 * this file except in compliance with the License. You can obtain a copy-
6 * in the file LICENSE in the source distribution or at-
7 * https://www.openssl.org/source/license.html-
8 */-
9-
10#include <openssl/crypto.h>-
11#include "modes_lcl.h"-
12#include <string.h>-
13-
14int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx,-
15 const unsigned char iv[16],-
16 const unsigned char *inp, unsigned char *out,-
17 size_t len, int enc)-
18{-
19 const union {-
20 long one;-
21 char little;-
22 } is_endian = {-
23 1-
24 };-
25 union {-
26 u64 u[2];-
27 u32 d[4];-
28 u8 c[16];-
29 } tweak, scratch;-
30 unsigned int i;-
31-
32 if (len < 16)
len < 16Description
TRUEnever evaluated
FALSEnever evaluated
0
33 return -1;
never executed: return -1;
0
34-
35 memcpy(tweak.c, iv, 16);-
36-
37 (*ctx->block2) (tweak.c, tweak.c, ctx->key2);-
38-
39 if (!enc && (len % 16))
!encDescription
TRUEnever evaluated
FALSEnever evaluated
(len % 16)Description
TRUEnever evaluated
FALSEnever evaluated
0
40 len -= 16;
never executed: len -= 16;
0
41-
42 while (len >= 16) {
len >= 16Description
TRUEnever evaluated
FALSEnever evaluated
0
43#if defined(STRICT_ALIGNMENT)-
44 memcpy(scratch.c, inp, 16);-
45 scratch.u[0] ^= tweak.u[0];-
46 scratch.u[1] ^= tweak.u[1];-
47#else-
48 scratch.u[0] = ((u64 *)inp)[0] ^ tweak.u[0];-
49 scratch.u[1] = ((u64 *)inp)[1] ^ tweak.u[1];-
50#endif-
51 (*ctx->block1) (scratch.c, scratch.c, ctx->key1);-
52#if defined(STRICT_ALIGNMENT)-
53 scratch.u[0] ^= tweak.u[0];-
54 scratch.u[1] ^= tweak.u[1];-
55 memcpy(out, scratch.c, 16);-
56#else-
57 ((u64 *)out)[0] = scratch.u[0] ^= tweak.u[0];-
58 ((u64 *)out)[1] = scratch.u[1] ^= tweak.u[1];-
59#endif-
60 inp += 16;-
61 out += 16;-
62 len -= 16;-
63-
64 if (len == 0)
len == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
65 return 0;
never executed: return 0;
0
66-
67 if (is_endian.little) {
is_endian.littleDescription
TRUEnever evaluated
FALSEnever evaluated
0
68 unsigned int carry, res;-
69-
70 res = 0x87 & (((int)tweak.d[3]) >> 31);-
71 carry = (unsigned int)(tweak.u[0] >> 63);-
72 tweak.u[0] = (tweak.u[0] << 1) ^ res;-
73 tweak.u[1] = (tweak.u[1] << 1) | carry;-
74 } else {
never executed: end of block
0
75 size_t c;-
76-
77 for (c = 0, i = 0; i < 16; ++i) {
i < 16Description
TRUEnever evaluated
FALSEnever evaluated
0
78 /*-
79 * + substitutes for |, because c is 1 bit-
80 */-
81 c += ((size_t)tweak.c[i]) << 1;-
82 tweak.c[i] = (u8)c;-
83 c = c >> 8;-
84 }
never executed: end of block
0
85 tweak.c[0] ^= (u8)(0x87 & (0 - c));-
86 }
never executed: end of block
0
87 }-
88 if (enc) {
encDescription
TRUEnever evaluated
FALSEnever evaluated
0
89 for (i = 0; i < len; ++i) {
i < lenDescription
TRUEnever evaluated
FALSEnever evaluated
0
90 u8 c = inp[i];-
91 out[i] = scratch.c[i];-
92 scratch.c[i] = c;-
93 }
never executed: end of block
0
94 scratch.u[0] ^= tweak.u[0];-
95 scratch.u[1] ^= tweak.u[1];-
96 (*ctx->block1) (scratch.c, scratch.c, ctx->key1);-
97 scratch.u[0] ^= tweak.u[0];-
98 scratch.u[1] ^= tweak.u[1];-
99 memcpy(out - 16, scratch.c, 16);-
100 } else {
never executed: end of block
0
101 union {-
102 u64 u[2];-
103 u8 c[16];-
104 } tweak1;-
105-
106 if (is_endian.little) {
is_endian.littleDescription
TRUEnever evaluated
FALSEnever evaluated
0
107 unsigned int carry, res;-
108-
109 res = 0x87 & (((int)tweak.d[3]) >> 31);-
110 carry = (unsigned int)(tweak.u[0] >> 63);-
111 tweak1.u[0] = (tweak.u[0] << 1) ^ res;-
112 tweak1.u[1] = (tweak.u[1] << 1) | carry;-
113 } else {
never executed: end of block
0
114 size_t c;-
115-
116 for (c = 0, i = 0; i < 16; ++i) {
i < 16Description
TRUEnever evaluated
FALSEnever evaluated
0
117 /*-
118 * + substitutes for |, because c is 1 bit-
119 */-
120 c += ((size_t)tweak.c[i]) << 1;-
121 tweak1.c[i] = (u8)c;-
122 c = c >> 8;-
123 }
never executed: end of block
0
124 tweak1.c[0] ^= (u8)(0x87 & (0 - c));-
125 }
never executed: end of block
0
126#if defined(STRICT_ALIGNMENT)-
127 memcpy(scratch.c, inp, 16);-
128 scratch.u[0] ^= tweak1.u[0];-
129 scratch.u[1] ^= tweak1.u[1];-
130#else-
131 scratch.u[0] = ((u64 *)inp)[0] ^ tweak1.u[0];-
132 scratch.u[1] = ((u64 *)inp)[1] ^ tweak1.u[1];-
133#endif-
134 (*ctx->block1) (scratch.c, scratch.c, ctx->key1);-
135 scratch.u[0] ^= tweak1.u[0];-
136 scratch.u[1] ^= tweak1.u[1];-
137-
138 for (i = 0; i < len; ++i) {
i < lenDescription
TRUEnever evaluated
FALSEnever evaluated
0
139 u8 c = inp[16 + i];-
140 out[16 + i] = scratch.c[i];-
141 scratch.c[i] = c;-
142 }
never executed: end of block
0
143 scratch.u[0] ^= tweak.u[0];-
144 scratch.u[1] ^= tweak.u[1];-
145 (*ctx->block1) (scratch.c, scratch.c, ctx->key1);-
146#if defined(STRICT_ALIGNMENT)-
147 scratch.u[0] ^= tweak.u[0];-
148 scratch.u[1] ^= tweak.u[1];-
149 memcpy(out, scratch.c, 16);-
150#else-
151 ((u64 *)out)[0] = scratch.u[0] ^ tweak.u[0];-
152 ((u64 *)out)[1] = scratch.u[1] ^ tweak.u[1];-
153#endif-
154 }
never executed: end of block
0
155-
156 return 0;
never executed: return 0;
0
157}-
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