1 | #ifndef OCRYPT_H
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2 | #define OCRYPT_H
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3 |
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4 | struct ocrypt
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5 | {
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6 | unsigned short ax, bx, cx, dx, si, tmp, x1a2, x1a0[16], res, i, inter, cfc, cfd, compte;
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7 | unsigned char cle[33];
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8 | short c;
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9 | int c1, count;
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10 | short d, e;
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11 | } oc;
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12 |
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13 | int occode()
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14 | {
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15 | oc.dx = oc.x1a2 + oc.i;
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16 | oc.ax = oc.x1a0[oc.i];
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17 | oc.cx = 0x015a;
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18 | oc.bx = 0x4e35;
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19 |
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20 | oc.tmp = oc.ax;
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21 | oc.ax = oc.si;
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22 | oc.si = oc.tmp;
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23 |
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24 | oc.tmp = oc.ax;
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25 | oc.ax = oc.dx;
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26 | oc.dx = oc.tmp;
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27 |
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28 | if(oc.ax != 0)
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29 | oc.ax = oc.ax * oc.bx;
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30 |
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31 | oc.tmp = oc.ax;
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32 | oc.ax = oc.cx;
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33 | oc.cx = oc.tmp;
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34 |
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35 | if(oc.ax != 0)
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36 | {
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37 | oc.ax = oc.ax * oc.si;
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38 | oc.cx = oc.ax + oc.cx;
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39 | }
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40 |
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41 | oc.tmp = oc.ax;
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42 | oc.ax = oc.si;
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43 | oc.si = oc.tmp;
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44 | oc.ax = oc.ax * oc.bx;
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45 | oc.dx = oc.cx + oc.dx;
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46 |
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47 | oc.ax = oc.ax + 1;
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48 |
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49 | oc.x1a2 = oc.dx;
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50 | oc.x1a0[oc.i] = oc.ax;
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51 |
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52 | oc.res = oc.ax ^ oc.dx;
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53 | oc.i = oc.i + 1;
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54 |
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55 | return 0;
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56 | }
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57 |
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58 | int ocassemble()
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59 | {
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60 | oc.x1a0[0] = (oc.cle[0] * 256) + oc.cle[1];
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61 | occode();
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62 | oc.inter = oc.res;
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63 |
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64 | oc.x1a0[1] = oc.x1a0[0] ^ ((oc.cle[2] * 256) + oc.cle[3]);
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65 | occode();
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66 | oc.inter = oc.inter ^ oc.res;
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67 |
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68 | oc.x1a0[2] = oc.x1a0[1] ^ ((oc.cle[4] * 256) + oc.cle[5]);
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69 | occode();
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70 | oc.inter = oc.inter ^ oc.res;
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71 |
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72 | oc.x1a0[3] = oc.x1a0[2] ^ ((oc.cle[6] * 256) + oc.cle[7]);
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73 | occode();
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74 | oc.inter = oc.inter ^ oc.res;
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75 |
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76 | oc.x1a0[4] = oc.x1a0[3] ^ ((oc.cle[8] * 256) + oc.cle[9]);
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77 | occode();
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78 | oc.inter = oc.inter ^ oc.res;
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79 |
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80 | oc.x1a0[5] = oc.x1a0[4] ^ ((oc.cle[10] * 256) + oc.cle[11]);
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81 | occode();
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82 | oc.inter = oc.inter ^ oc.res;
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83 |
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84 | oc.x1a0[6] = oc.x1a0[5] ^ ((oc.cle[12] * 256) + oc.cle[13]);
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85 | occode();
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86 | oc.inter = oc.inter ^ oc.res;
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87 |
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88 | oc.x1a0[7] = oc.x1a0[6] ^ ((oc.cle[14] * 256) + oc.cle[15]);
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89 | occode();
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90 | oc.inter = oc.inter ^ oc.res;
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91 |
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92 | oc.x1a0[8] = oc.x1a0[7] ^ ((oc.cle[16] * 256) + oc.cle[17]);
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93 | occode();
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94 | oc.inter = oc.inter ^ oc.res;
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95 |
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96 | oc.x1a0[9] = oc.x1a0[8] ^ ((oc.cle[18] * 256) + oc.cle[19]);
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97 | occode();
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98 | oc.inter = oc.inter ^ oc.res;
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99 |
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100 | oc.x1a0[10] = oc.x1a0[9] ^ ((oc.cle[20] * 256) + oc.cle[21]);
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101 | occode();
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102 | oc.inter = oc.inter ^ oc.res;
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103 |
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104 | oc.x1a0[11] = oc.x1a0[10] ^ ((oc.cle[22] * 256) + oc.cle[23]);
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105 | occode();
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106 | oc.inter = oc.inter ^ oc.res;
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107 |
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108 | oc.x1a0[12] = oc.x1a0[11] ^ ((oc.cle[24] * 256) + oc.cle[25]);
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109 | occode();
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110 | oc.inter = oc.inter ^ oc.res;
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111 |
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112 | oc.x1a0[13] = oc.x1a0[12] ^ ((oc.cle[26] * 256) + oc.cle[27]);
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113 | occode();
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114 | oc.inter = oc.inter ^ oc.res;
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115 |
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116 | oc.x1a0[14] = oc.x1a0[13] ^ ((oc.cle[28] * 256) + oc.cle[29]);
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117 | occode();
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118 | oc.inter = oc.inter ^ oc.res;
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119 |
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120 | oc.x1a0[15] = oc.x1a0[14] ^ ((oc.cle[30] * 256) + oc.cle[31]);
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121 | occode();
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122 | oc.inter = oc.inter ^ oc.res;
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123 |
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124 | oc.i = 0;
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125 |
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126 | return 0;
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127 | }
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128 |
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129 | int ocfin()
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130 | {
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131 | for(oc.compte = 0; oc.compte <= 31; oc.compte++)
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132 | oc.cle[oc.compte] = 0;
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133 |
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134 | oc.ax = 0; oc.bx = 0; oc.cx = 0; oc.dx = 0;
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135 | oc.si = 0; oc.tmp = 0; oc.x1a2 = 0;
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136 | oc.x1a0[0] = 0; oc.x1a0[1] = 0; oc.x1a0[2] = 0;
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137 | oc.x1a0[3] = 0; oc.x1a0[4] = 0;
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138 | oc.res = 0; oc.i = 0; oc.inter = 0; oc.cfc = 0;
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139 | oc.cfd = 0; oc.compte = 0; oc.c = 0;
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140 |
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141 | return 0;
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142 | }
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143 |
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144 | unsigned char* oencrypt(char* pw, char* buf, int len)
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145 | {
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146 | unsigned long long pos = 0;
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147 | unsigned char* outbuf = NULL;
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148 |
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149 | if(pw == NULL || buf == NULL) return NULL;
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150 |
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151 | outbuf = calloc(1, (len * 2) + 1);
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152 | if(outbuf == NULL)
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153 | {
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154 | err("no mem");
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155 | return NULL;
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156 | }
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157 |
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158 | strcpy((char*)oc.cle, "abcdefghijklmnopqrstuvwxyz012345");
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159 | strcpy((char*)oc.cle, pw);
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160 |
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161 | while(pos < len)
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162 | {
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163 | oc.c = buf[pos];
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164 |
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165 | ocassemble();
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166 | oc.cfc = oc.inter >> 8;
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167 | oc.cfd = oc.inter & 255;
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168 |
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169 | for(oc.compte = 0; oc.compte <= 31; oc.compte++)
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170 | oc.cle[oc.compte] = oc.cle[oc.compte] ^ oc.c;
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171 | oc.c = oc.c ^ (oc.cfc ^ oc.cfd);
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172 |
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173 | oc.d = (oc.c >> 4);
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174 | oc.e = (oc.c & 15);
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175 |
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176 | outbuf[pos * 2] = 0x61 + oc.d;
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177 | outbuf[pos * 2 + 1] = 0x61 + oc.e;
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178 | pos++;
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179 | }
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180 | ocfin();
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181 |
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182 | return outbuf;
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183 | }
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184 |
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185 | unsigned char* odecrypt(char* pw, char* buf, int len)
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186 | {
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187 | unsigned long long pos = 0;
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188 | unsigned char* outbuf = NULL;
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189 |
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190 | if(pw == NULL || buf == NULL) return NULL;
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191 |
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192 | outbuf = calloc(1, (len / 2) + 1);
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193 | if(outbuf == NULL)
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194 | {
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195 | err("no mem");
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196 | return NULL;
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197 | }
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198 |
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199 | strcpy((char*)oc.cle, "abcdefghijklmnopqrstuvwxyz012345");
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200 | strcpy((char*)oc.cle, pw);
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201 |
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202 | while(pos < len)
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203 | {
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204 | oc.d = buf[pos];
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205 | oc.e = buf[pos + 1];
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206 |
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207 | oc.d = oc.d - 0x61;
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208 | oc.d = oc.d << 4;
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209 |
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210 | oc.e = oc.e - 0x61;
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211 | oc.c = oc.d + oc.e;
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212 |
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213 | ocassemble();
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214 | oc.cfc = oc.inter >> 8;
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215 | oc.cfd = oc.inter & 255;
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216 |
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217 | oc.c = oc.c ^ (oc.cfc ^ oc.cfd);
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218 |
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219 | for(oc.compte = 0; oc.compte <= 31; oc.compte++)
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220 | oc.cle[oc.compte] = oc.cle[oc.compte] ^ oc.c;
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221 |
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222 | outbuf[pos / 2] = oc.c;
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223 | pos = pos + 2;
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224 | }
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225 | ocfin();
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226 |
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227 | return outbuf;
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228 | }
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229 |
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230 | #endif
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