1 | /*
|
---|
2 | * Copyright 2008-2016 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 |
|
---|
14 | #if !defined(STRICT_ALIGNMENT) && !defined(PEDANTIC)
|
---|
15 | # define STRICT_ALIGNMENT 0
|
---|
16 | #endif
|
---|
17 |
|
---|
18 | void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out,
|
---|
19 | size_t len, const void *key,
|
---|
20 | unsigned char ivec[16], block128_f block)
|
---|
21 | {
|
---|
22 | size_t n;
|
---|
23 | const unsigned char *iv = ivec;
|
---|
24 |
|
---|
25 | #if !defined(OPENSSL_SMALL_FOOTPRINT)
|
---|
26 | if (STRICT_ALIGNMENT &&
|
---|
27 | ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) {
|
---|
28 | while (len >= 16) {
|
---|
29 | for (n = 0; n < 16; ++n)
|
---|
30 | out[n] = in[n] ^ iv[n];
|
---|
31 | (*block) (out, out, key);
|
---|
32 | iv = out;
|
---|
33 | len -= 16;
|
---|
34 | in += 16;
|
---|
35 | out += 16;
|
---|
36 | }
|
---|
37 | } else {
|
---|
38 | while (len >= 16) {
|
---|
39 | for (n = 0; n < 16; n += sizeof(size_t))
|
---|
40 | *(size_t *)(out + n) =
|
---|
41 | *(size_t *)(in + n) ^ *(size_t *)(iv + n);
|
---|
42 | (*block) (out, out, key);
|
---|
43 | iv = out;
|
---|
44 | len -= 16;
|
---|
45 | in += 16;
|
---|
46 | out += 16;
|
---|
47 | }
|
---|
48 | }
|
---|
49 | #endif
|
---|
50 | while (len) {
|
---|
51 | for (n = 0; n < 16 && n < len; ++n)
|
---|
52 | out[n] = in[n] ^ iv[n];
|
---|
53 | for (; n < 16; ++n)
|
---|
54 | out[n] = iv[n];
|
---|
55 | (*block) (out, out, key);
|
---|
56 | iv = out;
|
---|
57 | if (len <= 16)
|
---|
58 | break;
|
---|
59 | len -= 16;
|
---|
60 | in += 16;
|
---|
61 | out += 16;
|
---|
62 | }
|
---|
63 | memcpy(ivec, iv, 16);
|
---|
64 | }
|
---|
65 |
|
---|
66 | void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out,
|
---|
67 | size_t len, const void *key,
|
---|
68 | unsigned char ivec[16], block128_f block)
|
---|
69 | {
|
---|
70 | size_t n;
|
---|
71 | union {
|
---|
72 | size_t t[16 / sizeof(size_t)];
|
---|
73 | unsigned char c[16];
|
---|
74 | } tmp;
|
---|
75 |
|
---|
76 | #if !defined(OPENSSL_SMALL_FOOTPRINT)
|
---|
77 | if (in != out) {
|
---|
78 | const unsigned char *iv = ivec;
|
---|
79 |
|
---|
80 | if (STRICT_ALIGNMENT &&
|
---|
81 | ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) {
|
---|
82 | while (len >= 16) {
|
---|
83 | (*block) (in, out, key);
|
---|
84 | for (n = 0; n < 16; ++n)
|
---|
85 | out[n] ^= iv[n];
|
---|
86 | iv = in;
|
---|
87 | len -= 16;
|
---|
88 | in += 16;
|
---|
89 | out += 16;
|
---|
90 | }
|
---|
91 | } else if (16 % sizeof(size_t) == 0) { /* always true */
|
---|
92 | while (len >= 16) {
|
---|
93 | size_t *out_t = (size_t *)out, *iv_t = (size_t *)iv;
|
---|
94 |
|
---|
95 | (*block) (in, out, key);
|
---|
96 | for (n = 0; n < 16 / sizeof(size_t); n++)
|
---|
97 | out_t[n] ^= iv_t[n];
|
---|
98 | iv = in;
|
---|
99 | len -= 16;
|
---|
100 | in += 16;
|
---|
101 | out += 16;
|
---|
102 | }
|
---|
103 | }
|
---|
104 | memcpy(ivec, iv, 16);
|
---|
105 | } else {
|
---|
106 | if (STRICT_ALIGNMENT &&
|
---|
107 | ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) {
|
---|
108 | unsigned char c;
|
---|
109 | while (len >= 16) {
|
---|
110 | (*block) (in, tmp.c, key);
|
---|
111 | for (n = 0; n < 16; ++n) {
|
---|
112 | c = in[n];
|
---|
113 | out[n] = tmp.c[n] ^ ivec[n];
|
---|
114 | ivec[n] = c;
|
---|
115 | }
|
---|
116 | len -= 16;
|
---|
117 | in += 16;
|
---|
118 | out += 16;
|
---|
119 | }
|
---|
120 | } else if (16 % sizeof(size_t) == 0) { /* always true */
|
---|
121 | while (len >= 16) {
|
---|
122 | size_t c, *out_t = (size_t *)out, *ivec_t = (size_t *)ivec;
|
---|
123 | const size_t *in_t = (const size_t *)in;
|
---|
124 |
|
---|
125 | (*block) (in, tmp.c, key);
|
---|
126 | for (n = 0; n < 16 / sizeof(size_t); n++) {
|
---|
127 | c = in_t[n];
|
---|
128 | out_t[n] = tmp.t[n] ^ ivec_t[n];
|
---|
129 | ivec_t[n] = c;
|
---|
130 | }
|
---|
131 | len -= 16;
|
---|
132 | in += 16;
|
---|
133 | out += 16;
|
---|
134 | }
|
---|
135 | }
|
---|
136 | }
|
---|
137 | #endif
|
---|
138 | while (len) {
|
---|
139 | unsigned char c;
|
---|
140 | (*block) (in, tmp.c, key);
|
---|
141 | for (n = 0; n < 16 && n < len; ++n) {
|
---|
142 | c = in[n];
|
---|
143 | out[n] = tmp.c[n] ^ ivec[n];
|
---|
144 | ivec[n] = c;
|
---|
145 | }
|
---|
146 | if (len <= 16) {
|
---|
147 | for (; n < 16; ++n)
|
---|
148 | ivec[n] = in[n];
|
---|
149 | break;
|
---|
150 | }
|
---|
151 | len -= 16;
|
---|
152 | in += 16;
|
---|
153 | out += 16;
|
---|
154 | }
|
---|
155 | }
|
---|