2 * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
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
10 #include "internal/cryptlib.h"
12 #include <openssl/aes.h>
15 #define N_WORDS (AES_BLOCK_SIZE / sizeof(unsigned long))
17 unsigned long data
[N_WORDS
];
20 /* XXX: probably some better way to do this */
21 #if defined(__i386__) || defined(__x86_64__)
22 # define UNALIGNED_MEMOPS_ARE_FAST 1
24 # define UNALIGNED_MEMOPS_ARE_FAST 0
27 #if UNALIGNED_MEMOPS_ARE_FAST
28 # define load_block(d, s) (d) = *(const aes_block_t *)(s)
29 # define store_block(d, s) *(aes_block_t *)(d) = (s)
31 # define load_block(d, s) memcpy((d).data, (s), AES_BLOCK_SIZE)
32 # define store_block(d, s) memcpy((d), (s).data, AES_BLOCK_SIZE)
35 /* N.B. The IV for this mode is _twice_ the block size */
37 void AES_ige_encrypt(const unsigned char *in
, unsigned char *out
,
38 size_t length
, const AES_KEY
*key
,
39 unsigned char *ivec
, const int enc
)
44 OPENSSL_assert(in
&& out
&& key
&& ivec
);
45 OPENSSL_assert((AES_ENCRYPT
== enc
) || (AES_DECRYPT
== enc
));
46 OPENSSL_assert((length
% AES_BLOCK_SIZE
) == 0);
48 len
= length
/ AES_BLOCK_SIZE
;
50 if (AES_ENCRYPT
== enc
) {
52 (UNALIGNED_MEMOPS_ARE_FAST
53 || ((size_t)in
| (size_t)out
| (size_t)ivec
) % sizeof(long) ==
55 aes_block_t
*ivp
= (aes_block_t
*) ivec
;
56 aes_block_t
*iv2p
= (aes_block_t
*) (ivec
+ AES_BLOCK_SIZE
);
59 aes_block_t
*inp
= (aes_block_t
*) in
;
60 aes_block_t
*outp
= (aes_block_t
*) out
;
62 for (n
= 0; n
< N_WORDS
; ++n
)
63 outp
->data
[n
] = inp
->data
[n
] ^ ivp
->data
[n
];
64 AES_encrypt((unsigned char *)outp
->data
,
65 (unsigned char *)outp
->data
, key
);
66 for (n
= 0; n
< N_WORDS
; ++n
)
67 outp
->data
[n
] ^= iv2p
->data
[n
];
72 out
+= AES_BLOCK_SIZE
;
74 memcpy(ivec
, ivp
->data
, AES_BLOCK_SIZE
);
75 memcpy(ivec
+ AES_BLOCK_SIZE
, iv2p
->data
, AES_BLOCK_SIZE
);
77 aes_block_t tmp
, tmp2
;
82 load_block(iv2
, ivec
+ AES_BLOCK_SIZE
);
86 for (n
= 0; n
< N_WORDS
; ++n
)
87 tmp2
.data
[n
] = tmp
.data
[n
] ^ iv
.data
[n
];
88 AES_encrypt((unsigned char *)tmp2
.data
,
89 (unsigned char *)tmp2
.data
, key
);
90 for (n
= 0; n
< N_WORDS
; ++n
)
91 tmp2
.data
[n
] ^= iv2
.data
[n
];
92 store_block(out
, tmp2
);
97 out
+= AES_BLOCK_SIZE
;
99 memcpy(ivec
, iv
.data
, AES_BLOCK_SIZE
);
100 memcpy(ivec
+ AES_BLOCK_SIZE
, iv2
.data
, AES_BLOCK_SIZE
);
104 (UNALIGNED_MEMOPS_ARE_FAST
105 || ((size_t)in
| (size_t)out
| (size_t)ivec
) % sizeof(long) ==
107 aes_block_t
*ivp
= (aes_block_t
*) ivec
;
108 aes_block_t
*iv2p
= (aes_block_t
*) (ivec
+ AES_BLOCK_SIZE
);
112 aes_block_t
*inp
= (aes_block_t
*) in
;
113 aes_block_t
*outp
= (aes_block_t
*) out
;
115 for (n
= 0; n
< N_WORDS
; ++n
)
116 tmp
.data
[n
] = inp
->data
[n
] ^ iv2p
->data
[n
];
117 AES_decrypt((unsigned char *)tmp
.data
,
118 (unsigned char *)outp
->data
, key
);
119 for (n
= 0; n
< N_WORDS
; ++n
)
120 outp
->data
[n
] ^= ivp
->data
[n
];
124 in
+= AES_BLOCK_SIZE
;
125 out
+= AES_BLOCK_SIZE
;
127 memcpy(ivec
, ivp
->data
, AES_BLOCK_SIZE
);
128 memcpy(ivec
+ AES_BLOCK_SIZE
, iv2p
->data
, AES_BLOCK_SIZE
);
130 aes_block_t tmp
, tmp2
;
134 load_block(iv
, ivec
);
135 load_block(iv2
, ivec
+ AES_BLOCK_SIZE
);
140 for (n
= 0; n
< N_WORDS
; ++n
)
141 tmp
.data
[n
] ^= iv2
.data
[n
];
142 AES_decrypt((unsigned char *)tmp
.data
,
143 (unsigned char *)tmp
.data
, key
);
144 for (n
= 0; n
< N_WORDS
; ++n
)
145 tmp
.data
[n
] ^= iv
.data
[n
];
146 store_block(out
, tmp
);
150 in
+= AES_BLOCK_SIZE
;
151 out
+= AES_BLOCK_SIZE
;
153 memcpy(ivec
, iv
.data
, AES_BLOCK_SIZE
);
154 memcpy(ivec
+ AES_BLOCK_SIZE
, iv2
.data
, AES_BLOCK_SIZE
);
160 * Note that its effectively impossible to do biIGE in anything other
161 * than a single pass, so no provision is made for chaining.
164 /* N.B. The IV for this mode is _four times_ the block size */
166 void AES_bi_ige_encrypt(const unsigned char *in
, unsigned char *out
,
167 size_t length
, const AES_KEY
*key
,
168 const AES_KEY
*key2
, const unsigned char *ivec
,
173 unsigned char tmp
[AES_BLOCK_SIZE
];
174 unsigned char tmp2
[AES_BLOCK_SIZE
];
175 unsigned char tmp3
[AES_BLOCK_SIZE
];
176 unsigned char prev
[AES_BLOCK_SIZE
];
177 const unsigned char *iv
;
178 const unsigned char *iv2
;
180 OPENSSL_assert(in
&& out
&& key
&& ivec
);
181 OPENSSL_assert((AES_ENCRYPT
== enc
) || (AES_DECRYPT
== enc
));
182 OPENSSL_assert((length
% AES_BLOCK_SIZE
) == 0);
184 if (AES_ENCRYPT
== enc
) {
186 * XXX: Do a separate case for when in != out (strictly should check
190 /* First the forward pass */
192 iv2
= ivec
+ AES_BLOCK_SIZE
;
193 while (len
>= AES_BLOCK_SIZE
) {
194 for (n
= 0; n
< AES_BLOCK_SIZE
; ++n
)
195 out
[n
] = in
[n
] ^ iv
[n
];
196 AES_encrypt(out
, out
, key
);
197 for (n
= 0; n
< AES_BLOCK_SIZE
; ++n
)
200 memcpy(prev
, in
, AES_BLOCK_SIZE
);
202 len
-= AES_BLOCK_SIZE
;
203 in
+= AES_BLOCK_SIZE
;
204 out
+= AES_BLOCK_SIZE
;
207 /* And now backwards */
208 iv
= ivec
+ AES_BLOCK_SIZE
* 2;
209 iv2
= ivec
+ AES_BLOCK_SIZE
* 3;
211 while (len
>= AES_BLOCK_SIZE
) {
212 out
-= AES_BLOCK_SIZE
;
214 * XXX: reduce copies by alternating between buffers
216 memcpy(tmp
, out
, AES_BLOCK_SIZE
);
217 for (n
= 0; n
< AES_BLOCK_SIZE
; ++n
)
220 * hexdump(stdout, "out ^ iv", out, AES_BLOCK_SIZE);
222 AES_encrypt(out
, out
, key
);
224 * hexdump(stdout,"enc", out, AES_BLOCK_SIZE);
227 * hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE);
229 for (n
= 0; n
< AES_BLOCK_SIZE
; ++n
)
232 * hexdump(stdout,"out", out, AES_BLOCK_SIZE);
235 memcpy(prev
, tmp
, AES_BLOCK_SIZE
);
237 len
-= AES_BLOCK_SIZE
;
240 /* First backwards */
241 iv
= ivec
+ AES_BLOCK_SIZE
* 2;
242 iv2
= ivec
+ AES_BLOCK_SIZE
* 3;
245 while (len
>= AES_BLOCK_SIZE
) {
246 in
-= AES_BLOCK_SIZE
;
247 out
-= AES_BLOCK_SIZE
;
248 memcpy(tmp
, in
, AES_BLOCK_SIZE
);
249 memcpy(tmp2
, in
, AES_BLOCK_SIZE
);
250 for (n
= 0; n
< AES_BLOCK_SIZE
; ++n
)
252 AES_decrypt(tmp
, out
, key
);
253 for (n
= 0; n
< AES_BLOCK_SIZE
; ++n
)
255 memcpy(tmp3
, tmp2
, AES_BLOCK_SIZE
);
258 len
-= AES_BLOCK_SIZE
;
261 /* And now forwards */
263 iv2
= ivec
+ AES_BLOCK_SIZE
;
265 while (len
>= AES_BLOCK_SIZE
) {
266 memcpy(tmp
, out
, AES_BLOCK_SIZE
);
267 memcpy(tmp2
, out
, AES_BLOCK_SIZE
);
268 for (n
= 0; n
< AES_BLOCK_SIZE
; ++n
)
270 AES_decrypt(tmp
, out
, key
);
271 for (n
= 0; n
< AES_BLOCK_SIZE
; ++n
)
273 memcpy(tmp3
, tmp2
, AES_BLOCK_SIZE
);
276 len
-= AES_BLOCK_SIZE
;
277 in
+= AES_BLOCK_SIZE
;
278 out
+= AES_BLOCK_SIZE
;