[331] | 1 | /*
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| 2 | * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/crypto.h>
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| 11 | #include "modes_lcl.h"
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| 12 | #include <string.h>
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| 13 |
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| 14 | /*
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| 15 | * Trouble with Ciphertext Stealing, CTS, mode is that there is no
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| 16 | * common official specification, but couple of cipher/application
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| 17 | * specific ones: RFC2040 and RFC3962. Then there is 'Proposal to
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| 18 | * Extend CBC Mode By "Ciphertext Stealing"' at NIST site, which
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| 19 | * deviates from mentioned RFCs. Most notably it allows input to be
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| 20 | * of block length and it doesn't flip the order of the last two
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| 21 | * blocks. CTS is being discussed even in ECB context, but it's not
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| 22 | * adopted for any known application. This implementation provides
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| 23 | * two interfaces: one compliant with above mentioned RFCs and one
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| 24 | * compliant with the NIST proposal, both extending CBC mode.
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| 25 | */
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| 26 |
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| 27 | size_t CRYPTO_cts128_encrypt_block(const unsigned char *in,
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| 28 | unsigned char *out, size_t len,
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| 29 | const void *key, unsigned char ivec[16],
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| 30 | block128_f block)
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| 31 | {
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| 32 | size_t residue, n;
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| 33 |
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| 34 | if (len <= 16)
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| 35 | return 0;
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| 36 |
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| 37 | if ((residue = len % 16) == 0)
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| 38 | residue = 16;
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| 39 |
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| 40 | len -= residue;
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| 41 |
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| 42 | CRYPTO_cbc128_encrypt(in, out, len, key, ivec, block);
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| 43 |
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| 44 | in += len;
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| 45 | out += len;
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| 46 |
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| 47 | for (n = 0; n < residue; ++n)
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| 48 | ivec[n] ^= in[n];
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| 49 | (*block) (ivec, ivec, key);
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| 50 | memcpy(out, out - 16, residue);
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| 51 | memcpy(out - 16, ivec, 16);
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| 52 |
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| 53 | return len + residue;
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| 54 | }
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| 55 |
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| 56 | size_t CRYPTO_nistcts128_encrypt_block(const unsigned char *in,
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| 57 | unsigned char *out, size_t len,
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| 58 | const void *key,
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| 59 | unsigned char ivec[16],
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| 60 | block128_f block)
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| 61 | {
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| 62 | size_t residue, n;
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| 63 |
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| 64 | if (len < 16)
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| 65 | return 0;
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| 66 |
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| 67 | residue = len % 16;
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| 68 |
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| 69 | len -= residue;
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| 70 |
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| 71 | CRYPTO_cbc128_encrypt(in, out, len, key, ivec, block);
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| 72 |
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| 73 | if (residue == 0)
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| 74 | return len;
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| 75 |
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| 76 | in += len;
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| 77 | out += len;
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| 78 |
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| 79 | for (n = 0; n < residue; ++n)
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| 80 | ivec[n] ^= in[n];
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| 81 | (*block) (ivec, ivec, key);
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| 82 | memcpy(out - 16 + residue, ivec, 16);
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| 83 |
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| 84 | return len + residue;
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| 85 | }
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| 86 |
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| 87 | size_t CRYPTO_cts128_encrypt(const unsigned char *in, unsigned char *out,
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| 88 | size_t len, const void *key,
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| 89 | unsigned char ivec[16], cbc128_f cbc)
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| 90 | {
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| 91 | size_t residue;
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| 92 | union {
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| 93 | size_t align;
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| 94 | unsigned char c[16];
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| 95 | } tmp;
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| 96 |
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| 97 | if (len <= 16)
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| 98 | return 0;
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| 99 |
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| 100 | if ((residue = len % 16) == 0)
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| 101 | residue = 16;
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| 102 |
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| 103 | len -= residue;
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| 104 |
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| 105 | (*cbc) (in, out, len, key, ivec, 1);
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| 106 |
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| 107 | in += len;
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| 108 | out += len;
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| 109 |
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| 110 | #if defined(CBC_HANDLES_TRUNCATED_IO)
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| 111 | memcpy(tmp.c, out - 16, 16);
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| 112 | (*cbc) (in, out - 16, residue, key, ivec, 1);
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| 113 | memcpy(out, tmp.c, residue);
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| 114 | #else
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| 115 | memset(tmp.c, 0, sizeof(tmp));
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| 116 | memcpy(tmp.c, in, residue);
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| 117 | memcpy(out, out - 16, residue);
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| 118 | (*cbc) (tmp.c, out - 16, 16, key, ivec, 1);
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| 119 | #endif
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| 120 | return len + residue;
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| 121 | }
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| 122 |
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| 123 | size_t CRYPTO_nistcts128_encrypt(const unsigned char *in, unsigned char *out,
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| 124 | size_t len, const void *key,
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| 125 | unsigned char ivec[16], cbc128_f cbc)
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| 126 | {
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| 127 | size_t residue;
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| 128 | union {
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| 129 | size_t align;
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| 130 | unsigned char c[16];
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| 131 | } tmp;
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| 132 |
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| 133 | if (len < 16)
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| 134 | return 0;
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| 135 |
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| 136 | residue = len % 16;
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| 137 |
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| 138 | len -= residue;
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| 139 |
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| 140 | (*cbc) (in, out, len, key, ivec, 1);
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| 141 |
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| 142 | if (residue == 0)
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| 143 | return len;
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| 144 |
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| 145 | in += len;
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| 146 | out += len;
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| 147 |
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| 148 | #if defined(CBC_HANDLES_TRUNCATED_IO)
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| 149 | (*cbc) (in, out - 16 + residue, residue, key, ivec, 1);
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| 150 | #else
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| 151 | memset(tmp.c, 0, sizeof(tmp));
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| 152 | memcpy(tmp.c, in, residue);
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| 153 | (*cbc) (tmp.c, out - 16 + residue, 16, key, ivec, 1);
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| 154 | #endif
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| 155 | return len + residue;
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| 156 | }
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| 157 |
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| 158 | size_t CRYPTO_cts128_decrypt_block(const unsigned char *in,
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| 159 | unsigned char *out, size_t len,
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| 160 | const void *key, unsigned char ivec[16],
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| 161 | block128_f block)
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| 162 | {
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| 163 | size_t residue, n;
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| 164 | union {
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| 165 | size_t align;
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| 166 | unsigned char c[32];
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| 167 | } tmp;
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| 168 |
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| 169 | if (len <= 16)
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| 170 | return 0;
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| 171 |
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| 172 | if ((residue = len % 16) == 0)
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| 173 | residue = 16;
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| 174 |
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| 175 | len -= 16 + residue;
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| 176 |
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| 177 | if (len) {
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| 178 | CRYPTO_cbc128_decrypt(in, out, len, key, ivec, block);
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| 179 | in += len;
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| 180 | out += len;
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| 181 | }
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| 182 |
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| 183 | (*block) (in, tmp.c + 16, key);
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| 184 |
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| 185 | memcpy(tmp.c, tmp.c + 16, 16);
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| 186 | memcpy(tmp.c, in + 16, residue);
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| 187 | (*block) (tmp.c, tmp.c, key);
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| 188 |
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| 189 | for (n = 0; n < 16; ++n) {
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| 190 | unsigned char c = in[n];
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| 191 | out[n] = tmp.c[n] ^ ivec[n];
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| 192 | ivec[n] = c;
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| 193 | }
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| 194 | for (residue += 16; n < residue; ++n)
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| 195 | out[n] = tmp.c[n] ^ in[n];
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| 196 |
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| 197 | return 16 + len + residue;
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| 198 | }
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| 199 |
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| 200 | size_t CRYPTO_nistcts128_decrypt_block(const unsigned char *in,
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| 201 | unsigned char *out, size_t len,
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| 202 | const void *key,
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| 203 | unsigned char ivec[16],
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| 204 | block128_f block)
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| 205 | {
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| 206 | size_t residue, n;
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| 207 | union {
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| 208 | size_t align;
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| 209 | unsigned char c[32];
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| 210 | } tmp;
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| 211 |
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| 212 | if (len < 16)
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| 213 | return 0;
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| 214 |
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| 215 | residue = len % 16;
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| 216 |
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| 217 | if (residue == 0) {
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| 218 | CRYPTO_cbc128_decrypt(in, out, len, key, ivec, block);
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| 219 | return len;
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| 220 | }
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| 221 |
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| 222 | len -= 16 + residue;
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| 223 |
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| 224 | if (len) {
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| 225 | CRYPTO_cbc128_decrypt(in, out, len, key, ivec, block);
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| 226 | in += len;
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| 227 | out += len;
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| 228 | }
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| 229 |
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| 230 | (*block) (in + residue, tmp.c + 16, key);
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| 231 |
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| 232 | memcpy(tmp.c, tmp.c + 16, 16);
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| 233 | memcpy(tmp.c, in, residue);
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| 234 | (*block) (tmp.c, tmp.c, key);
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| 235 |
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| 236 | for (n = 0; n < 16; ++n) {
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| 237 | unsigned char c = in[n];
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| 238 | out[n] = tmp.c[n] ^ ivec[n];
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| 239 | ivec[n] = in[n + residue];
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| 240 | tmp.c[n] = c;
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| 241 | }
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| 242 | for (residue += 16; n < residue; ++n)
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| 243 | out[n] = tmp.c[n] ^ tmp.c[n - 16];
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| 244 |
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| 245 | return 16 + len + residue;
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| 246 | }
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| 247 |
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| 248 | size_t CRYPTO_cts128_decrypt(const unsigned char *in, unsigned char *out,
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| 249 | size_t len, const void *key,
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| 250 | unsigned char ivec[16], cbc128_f cbc)
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| 251 | {
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| 252 | size_t residue;
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| 253 | union {
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| 254 | size_t align;
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| 255 | unsigned char c[32];
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| 256 | } tmp;
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| 257 |
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| 258 | if (len <= 16)
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| 259 | return 0;
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| 260 |
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| 261 | if ((residue = len % 16) == 0)
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| 262 | residue = 16;
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| 263 |
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| 264 | len -= 16 + residue;
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| 265 |
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| 266 | if (len) {
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| 267 | (*cbc) (in, out, len, key, ivec, 0);
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| 268 | in += len;
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| 269 | out += len;
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| 270 | }
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| 271 |
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| 272 | memset(tmp.c, 0, sizeof(tmp));
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| 273 | /*
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| 274 | * this places in[16] at &tmp.c[16] and decrypted block at &tmp.c[0]
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| 275 | */
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| 276 | (*cbc) (in, tmp.c, 16, key, tmp.c + 16, 0);
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| 277 |
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| 278 | memcpy(tmp.c, in + 16, residue);
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| 279 | #if defined(CBC_HANDLES_TRUNCATED_IO)
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| 280 | (*cbc) (tmp.c, out, 16 + residue, key, ivec, 0);
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| 281 | #else
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| 282 | (*cbc) (tmp.c, tmp.c, 32, key, ivec, 0);
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| 283 | memcpy(out, tmp.c, 16 + residue);
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| 284 | #endif
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| 285 | return 16 + len + residue;
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| 286 | }
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| 287 |
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| 288 | size_t CRYPTO_nistcts128_decrypt(const unsigned char *in, unsigned char *out,
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| 289 | size_t len, const void *key,
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| 290 | unsigned char ivec[16], cbc128_f cbc)
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| 291 | {
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| 292 | size_t residue;
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| 293 | union {
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| 294 | size_t align;
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| 295 | unsigned char c[32];
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| 296 | } tmp;
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| 297 |
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| 298 | if (len < 16)
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| 299 | return 0;
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| 300 |
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| 301 | residue = len % 16;
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| 302 |
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| 303 | if (residue == 0) {
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| 304 | (*cbc) (in, out, len, key, ivec, 0);
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| 305 | return len;
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| 306 | }
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| 307 |
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| 308 | len -= 16 + residue;
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| 309 |
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| 310 | if (len) {
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| 311 | (*cbc) (in, out, len, key, ivec, 0);
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| 312 | in += len;
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| 313 | out += len;
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| 314 | }
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| 315 |
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| 316 | memset(tmp.c, 0, sizeof(tmp));
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| 317 | /*
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| 318 | * this places in[16] at &tmp.c[16] and decrypted block at &tmp.c[0]
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| 319 | */
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| 320 | (*cbc) (in + residue, tmp.c, 16, key, tmp.c + 16, 0);
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| 321 |
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| 322 | memcpy(tmp.c, in, residue);
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| 323 | #if defined(CBC_HANDLES_TRUNCATED_IO)
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| 324 | (*cbc) (tmp.c, out, 16 + residue, key, ivec, 0);
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| 325 | #else
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| 326 | (*cbc) (tmp.c, tmp.c, 32, key, ivec, 0);
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| 327 | memcpy(out, tmp.c, 16 + residue);
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| 328 | #endif
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| 329 | return 16 + len + residue;
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| 330 | }
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| 331 |
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| 332 | #if defined(SELFTEST)
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| 333 | # include <stdio.h>
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| 334 | # include <openssl/aes.h>
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| 335 |
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| 336 | /* test vectors from RFC 3962 */
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| 337 | static const unsigned char test_key[16] = "chicken teriyaki";
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| 338 | static const unsigned char test_input[64] =
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| 339 | "I would like the" " General Gau's C"
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| 340 | "hicken, please, " "and wonton soup.";
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| 341 | static const unsigned char test_iv[16] =
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| 342 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
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| 343 |
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| 344 | static const unsigned char vector_17[17] = {
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| 345 | 0xc6, 0x35, 0x35, 0x68, 0xf2, 0xbf, 0x8c, 0xb4,
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| 346 | 0xd8, 0xa5, 0x80, 0x36, 0x2d, 0xa7, 0xff, 0x7f,
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| 347 | 0x97
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| 348 | };
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| 349 |
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| 350 | static const unsigned char vector_31[31] = {
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| 351 | 0xfc, 0x00, 0x78, 0x3e, 0x0e, 0xfd, 0xb2, 0xc1,
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| 352 | 0xd4, 0x45, 0xd4, 0xc8, 0xef, 0xf7, 0xed, 0x22,
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| 353 | 0x97, 0x68, 0x72, 0x68, 0xd6, 0xec, 0xcc, 0xc0,
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| 354 | 0xc0, 0x7b, 0x25, 0xe2, 0x5e, 0xcf, 0xe5
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| 355 | };
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| 356 |
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| 357 | static const unsigned char vector_32[32] = {
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| 358 | 0x39, 0x31, 0x25, 0x23, 0xa7, 0x86, 0x62, 0xd5,
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| 359 | 0xbe, 0x7f, 0xcb, 0xcc, 0x98, 0xeb, 0xf5, 0xa8,
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| 360 | 0x97, 0x68, 0x72, 0x68, 0xd6, 0xec, 0xcc, 0xc0,
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| 361 | 0xc0, 0x7b, 0x25, 0xe2, 0x5e, 0xcf, 0xe5, 0x84
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| 362 | };
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| 363 |
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| 364 | static const unsigned char vector_47[47] = {
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| 365 | 0x97, 0x68, 0x72, 0x68, 0xd6, 0xec, 0xcc, 0xc0,
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| 366 | 0xc0, 0x7b, 0x25, 0xe2, 0x5e, 0xcf, 0xe5, 0x84,
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| 367 | 0xb3, 0xff, 0xfd, 0x94, 0x0c, 0x16, 0xa1, 0x8c,
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| 368 | 0x1b, 0x55, 0x49, 0xd2, 0xf8, 0x38, 0x02, 0x9e,
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| 369 | 0x39, 0x31, 0x25, 0x23, 0xa7, 0x86, 0x62, 0xd5,
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| 370 | 0xbe, 0x7f, 0xcb, 0xcc, 0x98, 0xeb, 0xf5
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| 371 | };
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| 372 |
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| 373 | static const unsigned char vector_48[48] = {
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| 374 | 0x97, 0x68, 0x72, 0x68, 0xd6, 0xec, 0xcc, 0xc0,
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| 375 | 0xc0, 0x7b, 0x25, 0xe2, 0x5e, 0xcf, 0xe5, 0x84,
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| 376 | 0x9d, 0xad, 0x8b, 0xbb, 0x96, 0xc4, 0xcd, 0xc0,
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| 377 | 0x3b, 0xc1, 0x03, 0xe1, 0xa1, 0x94, 0xbb, 0xd8,
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| 378 | 0x39, 0x31, 0x25, 0x23, 0xa7, 0x86, 0x62, 0xd5,
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| 379 | 0xbe, 0x7f, 0xcb, 0xcc, 0x98, 0xeb, 0xf5, 0xa8
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| 380 | };
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| 381 |
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| 382 | static const unsigned char vector_64[64] = {
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| 383 | 0x97, 0x68, 0x72, 0x68, 0xd6, 0xec, 0xcc, 0xc0,
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| 384 | 0xc0, 0x7b, 0x25, 0xe2, 0x5e, 0xcf, 0xe5, 0x84,
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| 385 | 0x39, 0x31, 0x25, 0x23, 0xa7, 0x86, 0x62, 0xd5,
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| 386 | 0xbe, 0x7f, 0xcb, 0xcc, 0x98, 0xeb, 0xf5, 0xa8,
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| 387 | 0x48, 0x07, 0xef, 0xe8, 0x36, 0xee, 0x89, 0xa5,
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| 388 | 0x26, 0x73, 0x0d, 0xbc, 0x2f, 0x7b, 0xc8, 0x40,
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| 389 | 0x9d, 0xad, 0x8b, 0xbb, 0x96, 0xc4, 0xcd, 0xc0,
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| 390 | 0x3b, 0xc1, 0x03, 0xe1, 0xa1, 0x94, 0xbb, 0xd8
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| 391 | };
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| 392 |
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| 393 | static AES_KEY encks, decks;
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| 394 |
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| 395 | void test_vector(const unsigned char *vector, size_t len)
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| 396 | {
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| 397 | unsigned char iv[sizeof(test_iv)];
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| 398 | unsigned char cleartext[64], ciphertext[64];
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| 399 | size_t tail;
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| 400 |
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| 401 | printf("vector_%d\n", len);
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| 402 | fflush(stdout);
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| 403 |
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| 404 | if ((tail = len % 16) == 0)
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| 405 | tail = 16;
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| 406 | tail += 16;
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| 407 |
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| 408 | /* test block-based encryption */
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| 409 | memcpy(iv, test_iv, sizeof(test_iv));
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| 410 | CRYPTO_cts128_encrypt_block(test_input, ciphertext, len, &encks, iv,
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| 411 | (block128_f) AES_encrypt);
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| 412 | if (memcmp(ciphertext, vector, len))
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| 413 | fprintf(stderr, "output_%d mismatch\n", len), exit(1);
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| 414 | if (memcmp(iv, vector + len - tail, sizeof(iv)))
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| 415 | fprintf(stderr, "iv_%d mismatch\n", len), exit(1);
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| 416 |
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| 417 | /* test block-based decryption */
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| 418 | memcpy(iv, test_iv, sizeof(test_iv));
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| 419 | CRYPTO_cts128_decrypt_block(ciphertext, cleartext, len, &decks, iv,
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| 420 | (block128_f) AES_decrypt);
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| 421 | if (memcmp(cleartext, test_input, len))
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| 422 | fprintf(stderr, "input_%d mismatch\n", len), exit(2);
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| 423 | if (memcmp(iv, vector + len - tail, sizeof(iv)))
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| 424 | fprintf(stderr, "iv_%d mismatch\n", len), exit(2);
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| 425 |
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| 426 | /* test streamed encryption */
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| 427 | memcpy(iv, test_iv, sizeof(test_iv));
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| 428 | CRYPTO_cts128_encrypt(test_input, ciphertext, len, &encks, iv,
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| 429 | (cbc128_f) AES_cbc_encrypt);
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| 430 | if (memcmp(ciphertext, vector, len))
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| 431 | fprintf(stderr, "output_%d mismatch\n", len), exit(3);
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| 432 | if (memcmp(iv, vector + len - tail, sizeof(iv)))
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| 433 | fprintf(stderr, "iv_%d mismatch\n", len), exit(3);
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| 434 |
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| 435 | /* test streamed decryption */
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| 436 | memcpy(iv, test_iv, sizeof(test_iv));
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| 437 | CRYPTO_cts128_decrypt(ciphertext, cleartext, len, &decks, iv,
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| 438 | (cbc128_f) AES_cbc_encrypt);
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| 439 | if (memcmp(cleartext, test_input, len))
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| 440 | fprintf(stderr, "input_%d mismatch\n", len), exit(4);
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| 441 | if (memcmp(iv, vector + len - tail, sizeof(iv)))
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| 442 | fprintf(stderr, "iv_%d mismatch\n", len), exit(4);
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| 443 | }
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| 444 |
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| 445 | void test_nistvector(const unsigned char *vector, size_t len)
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| 446 | {
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| 447 | unsigned char iv[sizeof(test_iv)];
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| 448 | unsigned char cleartext[64], ciphertext[64], nistvector[64];
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| 449 | size_t tail;
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| 450 |
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| 451 | printf("nistvector_%d\n", len);
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| 452 | fflush(stdout);
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| 453 |
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| 454 | if ((tail = len % 16) == 0)
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| 455 | tail = 16;
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| 456 |
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| 457 | len -= 16 + tail;
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| 458 | memcpy(nistvector, vector, len);
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| 459 | /* flip two last blocks */
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| 460 | memcpy(nistvector + len, vector + len + 16, tail);
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| 461 | memcpy(nistvector + len + tail, vector + len, 16);
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| 462 | len += 16 + tail;
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| 463 | tail = 16;
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| 464 |
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| 465 | /* test block-based encryption */
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| 466 | memcpy(iv, test_iv, sizeof(test_iv));
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| 467 | CRYPTO_nistcts128_encrypt_block(test_input, ciphertext, len, &encks, iv,
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| 468 | (block128_f) AES_encrypt);
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| 469 | if (memcmp(ciphertext, nistvector, len))
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| 470 | fprintf(stderr, "output_%d mismatch\n", len), exit(1);
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| 471 | if (memcmp(iv, nistvector + len - tail, sizeof(iv)))
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| 472 | fprintf(stderr, "iv_%d mismatch\n", len), exit(1);
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| 473 |
|
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| 474 | /* test block-based decryption */
|
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| 475 | memcpy(iv, test_iv, sizeof(test_iv));
|
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| 476 | CRYPTO_nistcts128_decrypt_block(ciphertext, cleartext, len, &decks, iv,
|
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| 477 | (block128_f) AES_decrypt);
|
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| 478 | if (memcmp(cleartext, test_input, len))
|
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| 479 | fprintf(stderr, "input_%d mismatch\n", len), exit(2);
|
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| 480 | if (memcmp(iv, nistvector + len - tail, sizeof(iv)))
|
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| 481 | fprintf(stderr, "iv_%d mismatch\n", len), exit(2);
|
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| 482 |
|
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| 483 | /* test streamed encryption */
|
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| 484 | memcpy(iv, test_iv, sizeof(test_iv));
|
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| 485 | CRYPTO_nistcts128_encrypt(test_input, ciphertext, len, &encks, iv,
|
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| 486 | (cbc128_f) AES_cbc_encrypt);
|
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| 487 | if (memcmp(ciphertext, nistvector, len))
|
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| 488 | fprintf(stderr, "output_%d mismatch\n", len), exit(3);
|
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| 489 | if (memcmp(iv, nistvector + len - tail, sizeof(iv)))
|
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| 490 | fprintf(stderr, "iv_%d mismatch\n", len), exit(3);
|
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| 491 |
|
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| 492 | /* test streamed decryption */
|
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| 493 | memcpy(iv, test_iv, sizeof(test_iv));
|
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| 494 | CRYPTO_nistcts128_decrypt(ciphertext, cleartext, len, &decks, iv,
|
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| 495 | (cbc128_f) AES_cbc_encrypt);
|
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| 496 | if (memcmp(cleartext, test_input, len))
|
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| 497 | fprintf(stderr, "input_%d mismatch\n", len), exit(4);
|
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| 498 | if (memcmp(iv, nistvector + len - tail, sizeof(iv)))
|
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| 499 | fprintf(stderr, "iv_%d mismatch\n", len), exit(4);
|
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| 500 | }
|
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| 501 |
|
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| 502 | int main()
|
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| 503 | {
|
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| 504 | AES_set_encrypt_key(test_key, 128, &encks);
|
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| 505 | AES_set_decrypt_key(test_key, 128, &decks);
|
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| 506 |
|
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| 507 | test_vector(vector_17, sizeof(vector_17));
|
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| 508 | test_vector(vector_31, sizeof(vector_31));
|
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| 509 | test_vector(vector_32, sizeof(vector_32));
|
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| 510 | test_vector(vector_47, sizeof(vector_47));
|
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| 511 | test_vector(vector_48, sizeof(vector_48));
|
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| 512 | test_vector(vector_64, sizeof(vector_64));
|
---|
| 513 |
|
---|
| 514 | test_nistvector(vector_17, sizeof(vector_17));
|
---|
| 515 | test_nistvector(vector_31, sizeof(vector_31));
|
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| 516 | test_nistvector(vector_32, sizeof(vector_32));
|
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| 517 | test_nistvector(vector_47, sizeof(vector_47));
|
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| 518 | test_nistvector(vector_48, sizeof(vector_48));
|
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| 519 | test_nistvector(vector_64, sizeof(vector_64));
|
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| 520 |
|
---|
| 521 | return 0;
|
---|
| 522 | }
|
---|
| 523 | #endif
|
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