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.
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10 * modification, are permitted provided that the following conditions
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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
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24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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37 * "This product includes software developed by the OpenSSL Project
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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);