1 /* crypto/modes/wrap128.c */
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
6 /* ====================================================================
7 * Copyright (c) 2013 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
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29 * licensing@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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52 * ====================================================================
56 #include <openssl/modes.h>
58 static const unsigned char default_iv
[] = {
59 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6,
63 * Input size limit: lower than maximum of standards but far larger than
64 * anything that will be used in practice.
66 #define CRYPTO128_WRAP_MAX (1UL << 31)
68 size_t CRYPTO_128_wrap(void *key
, const unsigned char *iv
,
70 const unsigned char *in
, size_t inlen
,
73 unsigned char *A
, B
[16], *R
;
75 if ((inlen
& 0x7) || (inlen
< 8) || (inlen
> CRYPTO128_WRAP_MAX
))
79 memcpy(out
+ 8, in
, inlen
);
85 for (j
= 0; j
< 6; j
++) {
87 for (i
= 0; i
< inlen
; i
+= 8, t
++, R
+= 8) {
90 A
[7] ^= (unsigned char)(t
& 0xff);
92 A
[6] ^= (unsigned char)((t
>> 8) & 0xff);
93 A
[5] ^= (unsigned char)((t
>> 16) & 0xff);
94 A
[4] ^= (unsigned char)((t
>> 24) & 0xff);
103 size_t CRYPTO_128_unwrap(void *key
, const unsigned char *iv
,
105 const unsigned char *in
, size_t inlen
,
108 unsigned char *A
, B
[16], *R
;
111 if ((inlen
& 0x7) || (inlen
< 16) || (inlen
> CRYPTO128_WRAP_MAX
))
114 t
= 6 * (inlen
>> 3);
116 memcpy(out
, in
+ 8, inlen
);
117 for (j
= 0; j
< 6; j
++) {
119 for (i
= 0; i
< inlen
; i
+= 8, t
--, R
-= 8) {
120 A
[7] ^= (unsigned char)(t
& 0xff);
122 A
[6] ^= (unsigned char)((t
>> 8) & 0xff);
123 A
[5] ^= (unsigned char)((t
>> 16) & 0xff);
124 A
[4] ^= (unsigned char)((t
>> 24) & 0xff);
133 if (memcmp(A
, iv
, 8)) {
134 OPENSSL_cleanse(out
, inlen
);