1 /* crypto/modes/wrap128.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2013 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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51 * ====================================================================
55 #include <openssl/modes.h>
57 static const unsigned char default_iv[] = {
58 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6,
60 /* Input size limit: lower than maximum of standards but far larger than
61 * anything that will be used in practice.
63 #define CRYPTO128_WRAP_MAX (1UL << 31)
65 size_t CRYPTO_128_wrap(void *key, const unsigned char *iv,
67 const unsigned char *in, size_t inlen, block128_f block)
69 unsigned char *A, B[16], *R;
71 if ((inlen & 0x7) || (inlen < 8) || (inlen > CRYPTO128_WRAP_MAX))
75 memcpy(out + 8, in, inlen);
81 for (j = 0; j < 6; j++)
84 for (i = 0; i < inlen; i += 8, t++, R += 8)
88 A[7] ^= (unsigned char)(t & 0xff);
91 A[6] ^= (unsigned char)((t >> 8) & 0xff);
92 A[5] ^= (unsigned char)((t >> 16) & 0xff);
93 A[4] ^= (unsigned char)((t >> 24) & 0xff);
102 size_t CRYPTO_128_unwrap(void *key, const unsigned char *iv,
104 const unsigned char *in, size_t inlen, block128_f block)
106 unsigned char *A, B[16], *R;
109 if ((inlen & 0x7) || (inlen < 16) || (inlen > CRYPTO128_WRAP_MAX))
112 t = 6 * (inlen >> 3);
114 memcpy(out, in + 8, inlen);
115 for (j = 0; j < 6; j++)
118 for (i = 0; i < inlen; i += 8, t--, R -= 8)
120 A[7] ^= (unsigned char)(t & 0xff);
123 A[6] ^= (unsigned char)((t >> 8) & 0xff);
124 A[5] ^= (unsigned char)((t >> 16) & 0xff);
125 A[4] ^= (unsigned char)((t >> 24) & 0xff);
134 if (memcmp(A, iv, 8))
136 OPENSSL_cleanse(out, inlen);