[331] | 1 | /*
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| 2 | * Copyright 1995-2016 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 "des_locl.h"
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| 11 | #include "e_os.h"
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| 12 |
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| 13 | /*
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| 14 | * The input and output encrypted as though 64bit cfb mode is being used.
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| 15 | * The extra state information to record how much of the 64bit block we have
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| 16 | * used is contained in *num;
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| 17 | */
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| 18 |
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| 19 | void DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out,
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| 20 | long length, DES_key_schedule *ks1,
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| 21 | DES_key_schedule *ks2, DES_key_schedule *ks3,
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| 22 | DES_cblock *ivec, int *num, int enc)
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| 23 | {
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| 24 | register DES_LONG v0, v1;
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| 25 | register long l = length;
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| 26 | register int n = *num;
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| 27 | DES_LONG ti[2];
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| 28 | unsigned char *iv, c, cc;
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| 29 |
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| 30 | iv = &(*ivec)[0];
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| 31 | if (enc) {
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| 32 | while (l--) {
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| 33 | if (n == 0) {
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| 34 | c2l(iv, v0);
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| 35 | c2l(iv, v1);
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| 36 |
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| 37 | ti[0] = v0;
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| 38 | ti[1] = v1;
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| 39 | DES_encrypt3(ti, ks1, ks2, ks3);
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| 40 | v0 = ti[0];
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| 41 | v1 = ti[1];
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| 42 |
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| 43 | iv = &(*ivec)[0];
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| 44 | l2c(v0, iv);
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| 45 | l2c(v1, iv);
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| 46 | iv = &(*ivec)[0];
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| 47 | }
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| 48 | c = *(in++) ^ iv[n];
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| 49 | *(out++) = c;
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| 50 | iv[n] = c;
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| 51 | n = (n + 1) & 0x07;
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| 52 | }
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| 53 | } else {
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| 54 | while (l--) {
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| 55 | if (n == 0) {
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| 56 | c2l(iv, v0);
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| 57 | c2l(iv, v1);
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| 58 |
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| 59 | ti[0] = v0;
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| 60 | ti[1] = v1;
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| 61 | DES_encrypt3(ti, ks1, ks2, ks3);
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| 62 | v0 = ti[0];
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| 63 | v1 = ti[1];
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| 64 |
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| 65 | iv = &(*ivec)[0];
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| 66 | l2c(v0, iv);
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| 67 | l2c(v1, iv);
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| 68 | iv = &(*ivec)[0];
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| 69 | }
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| 70 | cc = *(in++);
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| 71 | c = iv[n];
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| 72 | iv[n] = cc;
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| 73 | *(out++) = c ^ cc;
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| 74 | n = (n + 1) & 0x07;
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| 75 | }
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| 76 | }
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| 77 | v0 = v1 = ti[0] = ti[1] = c = cc = 0;
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| 78 | *num = n;
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| 79 | }
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| 80 |
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| 81 | /*
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| 82 | * This is compatible with the single key CFB-r for DES, even thought that's
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| 83 | * not what EVP needs.
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| 84 | */
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| 85 |
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| 86 | void DES_ede3_cfb_encrypt(const unsigned char *in, unsigned char *out,
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| 87 | int numbits, long length, DES_key_schedule *ks1,
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| 88 | DES_key_schedule *ks2, DES_key_schedule *ks3,
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| 89 | DES_cblock *ivec, int enc)
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| 90 | {
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| 91 | register DES_LONG d0, d1, v0, v1;
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| 92 | register unsigned long l = length, n = ((unsigned int)numbits + 7) / 8;
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| 93 | register int num = numbits, i;
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| 94 | DES_LONG ti[2];
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| 95 | unsigned char *iv;
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| 96 | unsigned char ovec[16];
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| 97 |
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| 98 | if (num > 64)
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| 99 | return;
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| 100 | iv = &(*ivec)[0];
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| 101 | c2l(iv, v0);
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| 102 | c2l(iv, v1);
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| 103 | if (enc) {
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| 104 | while (l >= n) {
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| 105 | l -= n;
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| 106 | ti[0] = v0;
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| 107 | ti[1] = v1;
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| 108 | DES_encrypt3(ti, ks1, ks2, ks3);
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| 109 | c2ln(in, d0, d1, n);
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| 110 | in += n;
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| 111 | d0 ^= ti[0];
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| 112 | d1 ^= ti[1];
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| 113 | l2cn(d0, d1, out, n);
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| 114 | out += n;
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| 115 | /*
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| 116 | * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
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| 117 | * gcc :-(
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| 118 | */
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| 119 | if (num == 32) {
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| 120 | v0 = v1;
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| 121 | v1 = d0;
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| 122 | } else if (num == 64) {
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| 123 | v0 = d0;
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| 124 | v1 = d1;
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| 125 | } else {
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| 126 | iv = &ovec[0];
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| 127 | l2c(v0, iv);
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| 128 | l2c(v1, iv);
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| 129 | l2c(d0, iv);
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| 130 | l2c(d1, iv);
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| 131 | /* shift ovec left most of the bits... */
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| 132 | memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
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| 133 | /* now the remaining bits */
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| 134 | if (num % 8 != 0)
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| 135 | for (i = 0; i < 8; ++i) {
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| 136 | ovec[i] <<= num % 8;
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| 137 | ovec[i] |= ovec[i + 1] >> (8 - num % 8);
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| 138 | }
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| 139 | iv = &ovec[0];
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| 140 | c2l(iv, v0);
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| 141 | c2l(iv, v1);
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| 142 | }
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| 143 | }
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| 144 | } else {
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| 145 | while (l >= n) {
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| 146 | l -= n;
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| 147 | ti[0] = v0;
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| 148 | ti[1] = v1;
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| 149 | DES_encrypt3(ti, ks1, ks2, ks3);
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| 150 | c2ln(in, d0, d1, n);
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| 151 | in += n;
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| 152 | /*
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| 153 | * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
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| 154 | * gcc :-(
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| 155 | */
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| 156 | if (num == 32) {
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| 157 | v0 = v1;
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| 158 | v1 = d0;
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| 159 | } else if (num == 64) {
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| 160 | v0 = d0;
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| 161 | v1 = d1;
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| 162 | } else {
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| 163 | iv = &ovec[0];
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| 164 | l2c(v0, iv);
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| 165 | l2c(v1, iv);
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| 166 | l2c(d0, iv);
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| 167 | l2c(d1, iv);
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| 168 | /* shift ovec left most of the bits... */
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| 169 | memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
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| 170 | /* now the remaining bits */
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| 171 | if (num % 8 != 0)
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| 172 | for (i = 0; i < 8; ++i) {
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| 173 | ovec[i] <<= num % 8;
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| 174 | ovec[i] |= ovec[i + 1] >> (8 - num % 8);
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| 175 | }
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| 176 | iv = &ovec[0];
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| 177 | c2l(iv, v0);
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| 178 | c2l(iv, v1);
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| 179 | }
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| 180 | d0 ^= ti[0];
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| 181 | d1 ^= ti[1];
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| 182 | l2cn(d0, d1, out, n);
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| 183 | out += n;
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| 184 | }
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| 185 | }
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| 186 | iv = &(*ivec)[0];
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| 187 | l2c(v0, iv);
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| 188 | l2c(v1, iv);
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| 189 | v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0;
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| 190 | }
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