Line data Source code
1 : /* crypto/modes/wrap128.c */
2 : /*
3 : * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
4 : * project.
5 : */
6 : /* ====================================================================
7 : * Copyright (c) 2013 The OpenSSL Project. All rights reserved.
8 : *
9 : * Redistribution and use in source and binary forms, with or without
10 : * modification, are permitted provided that the following conditions
11 : * are met:
12 : *
13 : * 1. Redistributions of source code must retain the above copyright
14 : * notice, this list of conditions and the following disclaimer.
15 : *
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
19 : * distribution.
20 : *
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/)"
25 : *
26 : * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 : * endorse or promote products derived from this software without
28 : * prior written permission. For written permission, please contact
29 : * licensing@OpenSSL.org.
30 : *
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.
34 : *
35 : * 6. Redistributions of any form whatsoever must retain the following
36 : * acknowledgment:
37 : * "This product includes software developed by the OpenSSL Project
38 : * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 : *
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
44 : * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 : * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 : * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 : * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 : * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 : * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 : * OF THE POSSIBILITY OF SUCH DAMAGE.
52 : * ====================================================================
53 : */
54 :
55 : #include "cryptlib.h"
56 : #include <openssl/modes.h>
57 :
58 : static const unsigned char default_iv[] = {
59 : 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6,
60 : };
61 :
62 : /*
63 : * Input size limit: lower than maximum of standards but far larger than
64 : * anything that will be used in practice.
65 : */
66 : #define CRYPTO128_WRAP_MAX (1UL << 31)
67 :
68 0 : size_t CRYPTO_128_wrap(void *key, const unsigned char *iv,
69 : unsigned char *out,
70 : const unsigned char *in, size_t inlen,
71 : block128_f block)
72 : {
73 : unsigned char *A, B[16], *R;
74 : size_t i, j, t;
75 0 : if ((inlen & 0x7) || (inlen < 8) || (inlen > CRYPTO128_WRAP_MAX))
76 : return 0;
77 : A = B;
78 : t = 1;
79 0 : memcpy(out + 8, in, inlen);
80 0 : if (!iv)
81 : iv = default_iv;
82 :
83 : memcpy(A, iv, 8);
84 :
85 0 : for (j = 0; j < 6; j++) {
86 : R = out + 8;
87 0 : for (i = 0; i < inlen; i += 8, t++, R += 8) {
88 : memcpy(B + 8, R, 8);
89 0 : block(B, B, key);
90 0 : A[7] ^= (unsigned char)(t & 0xff);
91 0 : if (t > 0xff) {
92 0 : A[6] ^= (unsigned char)((t >> 8) & 0xff);
93 0 : A[5] ^= (unsigned char)((t >> 16) & 0xff);
94 0 : A[4] ^= (unsigned char)((t >> 24) & 0xff);
95 : }
96 : memcpy(R, B + 8, 8);
97 : }
98 : }
99 : memcpy(out, A, 8);
100 0 : return inlen + 8;
101 : }
102 :
103 0 : size_t CRYPTO_128_unwrap(void *key, const unsigned char *iv,
104 : unsigned char *out,
105 : const unsigned char *in, size_t inlen,
106 : block128_f block)
107 : {
108 : unsigned char *A, B[16], *R;
109 : size_t i, j, t;
110 0 : inlen -= 8;
111 0 : if ((inlen & 0x7) || (inlen < 16) || (inlen > CRYPTO128_WRAP_MAX))
112 : return 0;
113 : A = B;
114 0 : t = 6 * (inlen >> 3);
115 : memcpy(A, in, 8);
116 0 : memcpy(out, in + 8, inlen);
117 0 : for (j = 0; j < 6; j++) {
118 0 : R = out + inlen - 8;
119 0 : for (i = 0; i < inlen; i += 8, t--, R -= 8) {
120 0 : A[7] ^= (unsigned char)(t & 0xff);
121 0 : if (t > 0xff) {
122 0 : A[6] ^= (unsigned char)((t >> 8) & 0xff);
123 0 : A[5] ^= (unsigned char)((t >> 16) & 0xff);
124 0 : A[4] ^= (unsigned char)((t >> 24) & 0xff);
125 : }
126 : memcpy(B + 8, R, 8);
127 0 : block(B, B, key);
128 : memcpy(R, B + 8, 8);
129 : }
130 : }
131 0 : if (!iv)
132 : iv = default_iv;
133 0 : if (memcmp(A, iv, 8)) {
134 0 : OPENSSL_cleanse(out, inlen);
135 0 : return 0;
136 : }
137 : return inlen;
138 : }
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