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Commit | Line | Data |
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4f22f405 | 1 | /* |
3c2bdd7d | 2 | * Copyright 2008-2021 The OpenSSL Project Authors. All Rights Reserved. |
85b2c0ce | 3 | * |
81cae8ce | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
4f22f405 RS |
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 | |
85b2c0ce AP |
8 | */ |
9 | ||
85b2c0ce | 10 | #include <string.h> |
459b15d4 | 11 | #include <openssl/crypto.h> |
25f2138b | 12 | #include "crypto/modes.h" |
85b2c0ce | 13 | |
021e5043 | 14 | #if !defined(STRICT_ALIGNMENT) && !defined(PEDANTIC) |
0f113f3e | 15 | # define STRICT_ALIGNMENT 0 |
85b2c0ce AP |
16 | #endif |
17 | ||
77286fe3 BE |
18 | #if defined(__GNUC__) && !STRICT_ALIGNMENT |
19 | typedef size_t size_t_aX __attribute((__aligned__(1))); | |
20 | #else | |
21 | typedef size_t size_t_aX; | |
22 | #endif | |
23 | ||
85b2c0ce | 24 | void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out, |
0f113f3e MC |
25 | size_t len, const void *key, |
26 | unsigned char ivec[16], block128_f block) | |
85b2c0ce | 27 | { |
0f113f3e MC |
28 | size_t n; |
29 | const unsigned char *iv = ivec; | |
85b2c0ce | 30 | |
b1498c98 RS |
31 | if (len == 0) |
32 | return; | |
33 | ||
85b2c0ce | 34 | #if !defined(OPENSSL_SMALL_FOOTPRINT) |
0f113f3e MC |
35 | if (STRICT_ALIGNMENT && |
36 | ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) { | |
37 | while (len >= 16) { | |
38 | for (n = 0; n < 16; ++n) | |
39 | out[n] = in[n] ^ iv[n]; | |
40 | (*block) (out, out, key); | |
41 | iv = out; | |
42 | len -= 16; | |
43 | in += 16; | |
44 | out += 16; | |
45 | } | |
46 | } else { | |
47 | while (len >= 16) { | |
48 | for (n = 0; n < 16; n += sizeof(size_t)) | |
77286fe3 BE |
49 | *(size_t_aX *)(out + n) = |
50 | *(size_t_aX *)(in + n) ^ *(size_t_aX *)(iv + n); | |
0f113f3e MC |
51 | (*block) (out, out, key); |
52 | iv = out; | |
53 | len -= 16; | |
54 | in += 16; | |
55 | out += 16; | |
56 | } | |
57 | } | |
85b2c0ce | 58 | #endif |
0f113f3e MC |
59 | while (len) { |
60 | for (n = 0; n < 16 && n < len; ++n) | |
61 | out[n] = in[n] ^ iv[n]; | |
62 | for (; n < 16; ++n) | |
63 | out[n] = iv[n]; | |
64 | (*block) (out, out, key); | |
65 | iv = out; | |
66 | if (len <= 16) | |
67 | break; | |
68 | len -= 16; | |
69 | in += 16; | |
70 | out += 16; | |
71 | } | |
145f12d1 P |
72 | if (ivec != iv) |
73 | memcpy(ivec, iv, 16); | |
85b2c0ce AP |
74 | } |
75 | ||
76 | void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out, | |
0f113f3e MC |
77 | size_t len, const void *key, |
78 | unsigned char ivec[16], block128_f block) | |
85b2c0ce | 79 | { |
0f113f3e MC |
80 | size_t n; |
81 | union { | |
82 | size_t t[16 / sizeof(size_t)]; | |
83 | unsigned char c[16]; | |
84 | } tmp; | |
85b2c0ce | 85 | |
b1498c98 RS |
86 | if (len == 0) |
87 | return; | |
88 | ||
85b2c0ce | 89 | #if !defined(OPENSSL_SMALL_FOOTPRINT) |
0f113f3e MC |
90 | if (in != out) { |
91 | const unsigned char *iv = ivec; | |
85b2c0ce | 92 | |
0f113f3e MC |
93 | if (STRICT_ALIGNMENT && |
94 | ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) { | |
95 | while (len >= 16) { | |
96 | (*block) (in, out, key); | |
97 | for (n = 0; n < 16; ++n) | |
98 | out[n] ^= iv[n]; | |
99 | iv = in; | |
100 | len -= 16; | |
101 | in += 16; | |
102 | out += 16; | |
103 | } | |
104 | } else if (16 % sizeof(size_t) == 0) { /* always true */ | |
105 | while (len >= 16) { | |
77286fe3 BE |
106 | size_t_aX *out_t = (size_t_aX *)out; |
107 | size_t_aX *iv_t = (size_t_aX *)iv; | |
96a4cf8c | 108 | |
0f113f3e MC |
109 | (*block) (in, out, key); |
110 | for (n = 0; n < 16 / sizeof(size_t); n++) | |
111 | out_t[n] ^= iv_t[n]; | |
112 | iv = in; | |
113 | len -= 16; | |
114 | in += 16; | |
115 | out += 16; | |
116 | } | |
117 | } | |
b875e0e8 P |
118 | if (ivec != iv) |
119 | memcpy(ivec, iv, 16); | |
0f113f3e MC |
120 | } else { |
121 | if (STRICT_ALIGNMENT && | |
122 | ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) { | |
123 | unsigned char c; | |
124 | while (len >= 16) { | |
125 | (*block) (in, tmp.c, key); | |
126 | for (n = 0; n < 16; ++n) { | |
127 | c = in[n]; | |
128 | out[n] = tmp.c[n] ^ ivec[n]; | |
129 | ivec[n] = c; | |
130 | } | |
131 | len -= 16; | |
132 | in += 16; | |
133 | out += 16; | |
134 | } | |
135 | } else if (16 % sizeof(size_t) == 0) { /* always true */ | |
136 | while (len >= 16) { | |
77286fe3 BE |
137 | size_t c; |
138 | size_t_aX *out_t = (size_t_aX *)out; | |
139 | size_t_aX *ivec_t = (size_t_aX *)ivec; | |
140 | const size_t_aX *in_t = (const size_t_aX *)in; | |
96a4cf8c | 141 | |
0f113f3e MC |
142 | (*block) (in, tmp.c, key); |
143 | for (n = 0; n < 16 / sizeof(size_t); n++) { | |
144 | c = in_t[n]; | |
145 | out_t[n] = tmp.t[n] ^ ivec_t[n]; | |
146 | ivec_t[n] = c; | |
147 | } | |
148 | len -= 16; | |
149 | in += 16; | |
150 | out += 16; | |
151 | } | |
152 | } | |
153 | } | |
85b2c0ce | 154 | #endif |
0f113f3e MC |
155 | while (len) { |
156 | unsigned char c; | |
157 | (*block) (in, tmp.c, key); | |
158 | for (n = 0; n < 16 && n < len; ++n) { | |
159 | c = in[n]; | |
160 | out[n] = tmp.c[n] ^ ivec[n]; | |
161 | ivec[n] = c; | |
162 | } | |
163 | if (len <= 16) { | |
164 | for (; n < 16; ++n) | |
165 | ivec[n] = in[n]; | |
166 | break; | |
167 | } | |
168 | len -= 16; | |
169 | in += 16; | |
170 | out += 16; | |
171 | } | |
85b2c0ce | 172 | } |