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1 /* crypto/rc2/rc2_cbc.c */ |
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2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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3 * All rights reserved. |
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4 * |
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5 * This package is an SSL implementation written |
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6 * by Eric Young (eay@cryptsoft.com). |
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7 * The implementation was written so as to conform with Netscapes SSL. |
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8 * |
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9 * This library is free for commercial and non-commercial use as long as |
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10 * the following conditions are aheared to. The following conditions |
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11 * apply to all code found in this distribution, be it the RC4, RSA, |
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12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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13 * included with this distribution is covered by the same copyright terms |
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14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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15 * |
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16 * Copyright remains Eric Young's, and as such any Copyright notices in |
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17 * the code are not to be removed. |
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18 * If this package is used in a product, Eric Young should be given attribution |
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19 * as the author of the parts of the library used. |
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20 * This can be in the form of a textual message at program startup or |
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21 * in documentation (online or textual) provided with the package. |
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22 * |
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23 * Redistribution and use in source and binary forms, with or without |
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24 * modification, are permitted provided that the following conditions |
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25 * are met: |
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26 * 1. Redistributions of source code must retain the copyright |
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27 * notice, this list of conditions and the following disclaimer. |
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28 * 2. Redistributions in binary form must reproduce the above copyright |
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29 * notice, this list of conditions and the following disclaimer in the |
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30 * documentation and/or other materials provided with the distribution. |
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31 * 3. All advertising materials mentioning features or use of this software |
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32 * must display the following acknowledgement: |
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33 * "This product includes cryptographic software written by |
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34 * Eric Young (eay@cryptsoft.com)" |
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35 * The word 'cryptographic' can be left out if the rouines from the library |
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36 * being used are not cryptographic related :-). |
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37 * 4. If you include any Windows specific code (or a derivative thereof) from |
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38 * the apps directory (application code) you must include an acknowledgement: |
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39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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40 * |
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41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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51 * SUCH DAMAGE. |
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52 * |
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53 * The licence and distribution terms for any publically available version or |
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54 * derivative of this code cannot be changed. i.e. this code cannot simply be |
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55 * copied and put under another distribution licence |
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56 * [including the GNU Public Licence.] |
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57 */ |
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58 |
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59 #include <openssl/rc2.h> |
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60 #include "rc2_locl.h" |
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61 |
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62 EXPORT_C void RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, |
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63 RC2_KEY *ks, unsigned char *iv, int encrypt) |
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64 { |
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65 register unsigned long tin0,tin1; |
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66 register unsigned long tout0,tout1,xor0,xor1; |
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67 register long l=length; |
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68 unsigned long tin[2]; |
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69 |
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70 if (encrypt) |
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71 { |
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72 c2l(iv,tout0); |
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73 c2l(iv,tout1); |
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74 iv-=8; |
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75 for (l-=8; l>=0; l-=8) |
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76 { |
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77 c2l(in,tin0); |
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78 c2l(in,tin1); |
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79 tin0^=tout0; |
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80 tin1^=tout1; |
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81 tin[0]=tin0; |
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82 tin[1]=tin1; |
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83 RC2_encrypt(tin,ks); |
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84 tout0=tin[0]; l2c(tout0,out); |
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85 tout1=tin[1]; l2c(tout1,out); |
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86 } |
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87 if (l != -8) |
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88 { |
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89 c2ln(in,tin0,tin1,l+8); |
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90 tin0^=tout0; |
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91 tin1^=tout1; |
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92 tin[0]=tin0; |
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93 tin[1]=tin1; |
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94 RC2_encrypt(tin,ks); |
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95 tout0=tin[0]; l2c(tout0,out); |
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96 tout1=tin[1]; l2c(tout1,out); |
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97 } |
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98 l2c(tout0,iv); |
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99 l2c(tout1,iv); |
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100 } |
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101 else |
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102 { |
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103 c2l(iv,xor0); |
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104 c2l(iv,xor1); |
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105 iv-=8; |
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106 for (l-=8; l>=0; l-=8) |
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107 { |
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108 c2l(in,tin0); tin[0]=tin0; |
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109 c2l(in,tin1); tin[1]=tin1; |
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110 RC2_decrypt(tin,ks); |
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111 tout0=tin[0]^xor0; |
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112 tout1=tin[1]^xor1; |
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113 l2c(tout0,out); |
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114 l2c(tout1,out); |
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115 xor0=tin0; |
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116 xor1=tin1; |
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117 } |
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118 if (l != -8) |
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119 { |
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120 c2l(in,tin0); tin[0]=tin0; |
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121 c2l(in,tin1); tin[1]=tin1; |
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122 RC2_decrypt(tin,ks); |
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123 tout0=tin[0]^xor0; |
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124 tout1=tin[1]^xor1; |
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125 l2cn(tout0,tout1,out,l+8); |
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126 xor0=tin0; |
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127 xor1=tin1; |
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128 } |
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129 l2c(xor0,iv); |
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130 l2c(xor1,iv); |
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131 } |
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132 tin0=tin1=tout0=tout1=xor0=xor1=0; |
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133 tin[0]=tin[1]=0; |
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134 } |
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135 |
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136 EXPORT_C void RC2_encrypt(unsigned long *d, RC2_KEY *key) |
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137 { |
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138 int i,n; |
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139 register RC2_INT *p0,*p1; |
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140 register RC2_INT x0,x1,x2,x3,t; |
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141 unsigned long l; |
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142 |
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143 l=d[0]; |
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144 x0=(RC2_INT)l&0xffff; |
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145 x1=(RC2_INT)(l>>16L); |
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146 l=d[1]; |
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147 x2=(RC2_INT)l&0xffff; |
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148 x3=(RC2_INT)(l>>16L); |
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149 |
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150 n=3; |
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151 i=5; |
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152 |
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153 p0=p1= &(key->data[0]); |
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154 for (;;) |
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155 { |
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156 t=(x0+(x1& ~x3)+(x2&x3)+ *(p0++))&0xffff; |
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157 x0=(t<<1)|(t>>15); |
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158 t=(x1+(x2& ~x0)+(x3&x0)+ *(p0++))&0xffff; |
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159 x1=(t<<2)|(t>>14); |
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160 t=(x2+(x3& ~x1)+(x0&x1)+ *(p0++))&0xffff; |
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161 x2=(t<<3)|(t>>13); |
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162 t=(x3+(x0& ~x2)+(x1&x2)+ *(p0++))&0xffff; |
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163 x3=(t<<5)|(t>>11); |
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164 |
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165 if (--i == 0) |
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166 { |
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167 if (--n == 0) break; |
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168 i=(n == 2)?6:5; |
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169 |
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170 x0+=p1[x3&0x3f]; |
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171 x1+=p1[x0&0x3f]; |
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172 x2+=p1[x1&0x3f]; |
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173 x3+=p1[x2&0x3f]; |
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174 } |
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175 } |
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176 |
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177 d[0]=(unsigned long)(x0&0xffff)|((unsigned long)(x1&0xffff)<<16L); |
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178 d[1]=(unsigned long)(x2&0xffff)|((unsigned long)(x3&0xffff)<<16L); |
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179 } |
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180 |
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181 EXPORT_C void RC2_decrypt(unsigned long *d, RC2_KEY *key) |
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182 { |
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183 int i,n; |
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184 register RC2_INT *p0,*p1; |
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185 register RC2_INT x0,x1,x2,x3,t; |
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186 unsigned long l; |
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187 |
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188 l=d[0]; |
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189 x0=(RC2_INT)l&0xffff; |
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190 x1=(RC2_INT)(l>>16L); |
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191 l=d[1]; |
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192 x2=(RC2_INT)l&0xffff; |
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193 x3=(RC2_INT)(l>>16L); |
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194 |
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195 n=3; |
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196 i=5; |
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197 |
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198 p0= &(key->data[63]); |
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199 p1= &(key->data[0]); |
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200 for (;;) |
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201 { |
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202 t=((x3<<11)|(x3>>5))&0xffff; |
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203 x3=(t-(x0& ~x2)-(x1&x2)- *(p0--))&0xffff; |
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204 t=((x2<<13)|(x2>>3))&0xffff; |
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205 x2=(t-(x3& ~x1)-(x0&x1)- *(p0--))&0xffff; |
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206 t=((x1<<14)|(x1>>2))&0xffff; |
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207 x1=(t-(x2& ~x0)-(x3&x0)- *(p0--))&0xffff; |
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208 t=((x0<<15)|(x0>>1))&0xffff; |
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209 x0=(t-(x1& ~x3)-(x2&x3)- *(p0--))&0xffff; |
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210 |
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211 if (--i == 0) |
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212 { |
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213 if (--n == 0) break; |
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214 i=(n == 2)?6:5; |
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215 |
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216 x3=(x3-p1[x2&0x3f])&0xffff; |
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217 x2=(x2-p1[x1&0x3f])&0xffff; |
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218 x1=(x1-p1[x0&0x3f])&0xffff; |
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219 x0=(x0-p1[x3&0x3f])&0xffff; |
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220 } |
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221 } |
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222 |
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223 d[0]=(unsigned long)(x0&0xffff)|((unsigned long)(x1&0xffff)<<16L); |
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224 d[1]=(unsigned long)(x2&0xffff)|((unsigned long)(x3&0xffff)<<16L); |
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225 } |
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226 |