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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