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1 /* |
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2 * Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of the License "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * (c) 2003 Symbian Ltd. All rights reserved. |
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16 * |
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17 */ |
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18 |
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19 |
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20 |
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21 |
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22 /** |
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23 @file |
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24 */ |
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25 |
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26 #include <e32std.h> |
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27 #include <hash.h> |
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28 |
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29 #define EXPANDLOOP |
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30 |
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31 // |
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32 // 32bit endianness independent MD2 implementation |
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33 // |
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34 CMD2::CMD2(void) |
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35 : CMessageDigest(),iHash(MD2_HASH) |
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36 { |
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37 } |
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38 CMD2::CMD2(const CMD2& aMD) |
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39 : CMessageDigest(aMD),iHash(aMD.iHash),iNum(aMD.iNum) |
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40 { |
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41 (void)Mem::Copy(iData,aMD.iData,sizeof(iData)); |
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42 (void)Mem::Copy(iChecksum,aMD.iChecksum,sizeof(iChecksum)); |
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43 (void)Mem::Copy(iState,aMD.iState,sizeof(iState)); |
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44 } |
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45 EXPORT_C CMD2* CMD2::NewL(void) |
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46 { |
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47 return (new(ELeave) CMD2); |
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48 } |
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49 EXPORT_C CMessageDigest* CMD2::ReplicateL(void) |
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50 { |
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51 return NewL(); |
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52 } |
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53 EXPORT_C CMD2::~CMD2(void) |
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54 { |
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55 } |
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56 |
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57 EXPORT_C TPtrC8 CMD2::Hash(const TDesC8& aMessage) |
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58 { |
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59 TPtrC8 ptr(KNullDesC8()); |
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60 DoUpdate(aMessage.Ptr(),aMessage.Size()); |
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61 StoreState(); |
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62 DoFinal(); |
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63 ptr.Set(iHash); |
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64 RestoreState(); |
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65 return ptr; |
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66 } |
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67 |
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68 EXPORT_C CMessageDigest* CMD2::CopyL(void) |
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69 { |
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70 return new(ELeave) CMD2(*this); |
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71 } |
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72 EXPORT_C TInt CMD2::BlockSize(void) |
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73 { |
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74 return sizeof(iData); |
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75 } |
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76 EXPORT_C TInt CMD2::HashSize(void) |
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77 { |
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78 return MD2_HASH; |
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79 } |
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80 EXPORT_C void CMD2::Reset(void) |
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81 { |
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82 Mem::FillZ(iData,sizeof(iData)); |
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83 Mem::FillZ(iChecksum,sizeof(iChecksum)); |
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84 Mem::FillZ(iState,sizeof(iState)); |
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85 iNum=0; |
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86 } |
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87 |
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88 EXPORT_C void CMD2::Update(const TDesC8& aMessage) |
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89 { |
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90 DoUpdate(aMessage.Ptr(),aMessage.Size()); |
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91 } |
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92 |
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93 EXPORT_C TPtrC8 CMD2::Final(const TDesC8& aMessage) |
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94 { |
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95 TPtrC8 ptr(KNullDesC8()); |
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96 DoUpdate(aMessage.Ptr(),aMessage.Size()); |
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97 DoFinal(); |
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98 ptr.Set(iHash); |
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99 Reset(); |
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100 return ptr; |
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101 } |
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102 |
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103 EXPORT_C TPtrC8 CMD2::Final() |
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104 { |
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105 TPtrC8 ptr(KNullDesC8()); |
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106 DoFinal(); |
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107 ptr.Set(iHash); |
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108 Reset(); |
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109 return ptr; |
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110 } |
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111 |
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112 void CMD2::DoUpdate(const TUint8* aData,TUint aLength) |
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113 { |
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114 TBool carryOn=ETrue; |
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115 if (iNum) |
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116 { |
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117 if (iNum+aLength>=(TUint)MD2_BLOCK) |
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118 { |
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119 const TUint temp=MD2_BLOCK-iNum; |
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120 (void)Mem::Copy(iData+iNum,aData,temp); |
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121 Block(iData); |
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122 aData+=temp; |
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123 aLength-=temp; |
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124 iNum=0; |
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125 } |
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126 else |
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127 { |
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128 (void)Mem::Copy(iData+iNum,aData,aLength); |
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129 iNum+=aLength; |
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130 carryOn=EFalse; |
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131 } |
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132 } |
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133 // processing by block of MD2_BLOCK |
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134 if (carryOn) |
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135 { |
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136 while (aLength>=(TUint)MD2_BLOCK) |
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137 { |
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138 Block(aData); |
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139 aData+=MD2_BLOCK; |
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140 aLength-=MD2_BLOCK; |
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141 } |
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142 (void)Mem::Copy(iData,aData,aLength); |
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143 iNum=aLength; |
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144 } |
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145 } |
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146 static inline TUint CMD2_S(TUint& elt,TUint8 val) |
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147 { |
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148 return elt^=val; |
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149 } |
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150 // |
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151 // data must be MD2_BLOCK bytes long |
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152 // |
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153 void CMD2::Block(const TUint8* data) |
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154 { |
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155 TUint8 S[256]={ |
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156 0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, |
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157 0x3D, 0x36, 0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13, |
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158 0x62, 0xA7, 0x05, 0xF3, 0xC0, 0xC7, 0x73, 0x8C, |
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159 0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C, 0x82, 0xCA, |
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160 0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16, |
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161 0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12, |
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162 0xBE, 0x4E, 0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49, |
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163 0xA0, 0xFB, 0xF5, 0x8E, 0xBB, 0x2F, 0xEE, 0x7A, |
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164 0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2, 0x07, 0x3F, |
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165 0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21, |
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166 0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27, |
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167 0x35, 0x3E, 0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03, |
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168 0xFF, 0x19, 0x30, 0xB3, 0x48, 0xA5, 0xB5, 0xD1, |
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169 0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56, 0xAA, 0xC6, |
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170 0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6, |
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171 0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1, |
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172 0x45, 0x9D, 0x70, 0x59, 0x64, 0x71, 0x87, 0x20, |
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173 0x86, 0x5B, 0xCF, 0x65, 0xE6, 0x2D, 0xA8, 0x02, |
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174 0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0, 0xB9, 0xF6, |
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175 0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F, |
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176 0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A, |
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177 0xC3, 0x5C, 0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26, |
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178 0x2C, 0x53, 0x0D, 0x6E, 0x85, 0x28, 0x84, 0x09, |
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179 0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81, 0x4D, 0x52, |
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180 0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA, |
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181 0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A, |
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182 0x78, 0x88, 0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D, |
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183 0xE9, 0xCB, 0xD5, 0xFE, 0x3B, 0x00, 0x1D, 0x39, |
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184 0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58, 0xD0, 0xE4, |
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185 0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A, |
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186 0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A, |
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187 0xDB, 0x99, 0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14, |
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188 }; |
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189 TUint state[MD2_BLOCK*3]; |
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190 TUint j=iChecksum[MD2_BLOCK-1]; |
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191 TUint i=0,temp=0; |
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192 while (i<(TUint)MD2_BLOCK) |
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193 { |
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194 const TUint tempState=iState[i]; |
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195 temp=data[i]; |
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196 state[i]=tempState; |
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197 state[i+16]=temp; |
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198 state[i+32]=temp^tempState; |
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199 j=CMD2_S(iChecksum[i++],S[temp^j]); |
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200 } |
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201 temp=0; |
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202 TUint* pstate=state; |
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203 const TUint *pend=state+(MD2_BLOCK*3); |
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204 for (i=0; i<18; i++) |
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205 { |
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206 while (pstate<pend) |
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207 { |
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208 temp=CMD2_S(*pstate,S[temp]);pstate++; |
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209 temp=CMD2_S(*pstate,S[temp]);pstate++; |
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210 temp=CMD2_S(*pstate,S[temp]);pstate++; |
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211 temp=CMD2_S(*pstate,S[temp]);pstate++; |
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212 temp=CMD2_S(*pstate,S[temp]);pstate++; |
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213 temp=CMD2_S(*pstate,S[temp]);pstate++; |
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214 temp=CMD2_S(*pstate,S[temp]);pstate++; |
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215 temp=CMD2_S(*pstate,S[temp]);pstate++; |
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216 } |
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217 pstate=state; |
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218 temp=(temp+i)&0xff; |
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219 } |
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220 (void)Mem::Copy(iState,state,MD2_BLOCK*sizeof(TUint)); |
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221 } |
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222 void CMD2::DoFinal() |
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223 { |
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224 const TUint pad=MD2_BLOCK-iNum; |
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225 if (pad>0) |
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226 Mem::Fill(iData+iNum,(TUint8)pad,pad); |
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227 Block(iData); |
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228 |
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229 TUint8* pData=iData; |
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230 const TUint8* pEnd=iData+MD2_BLOCK; |
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231 const TUint* pChecksum=iChecksum; |
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232 while (pData<pEnd) |
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233 { |
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234 *pData=(TUint8)*pChecksum;//checksum is always less than 255 |
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235 pData++; |
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236 pChecksum++; |
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237 } |
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238 Block(iData); |
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239 |
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240 TUint* pState=iState; |
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241 for (TUint i=0;i<(TUint)MD2_BLOCK;i++,pState++) //safe: iState and iHash have got same size |
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242 iHash[i]=(TUint8)(*pState&0xff); |
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243 } |
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244 |
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245 void CMD2::RestoreState() |
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246 { |
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247 Mem::Copy(&iData[0], &iDataTemp[0], MD2_BLOCK); |
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248 Mem::Copy(&iChecksum[0], &iChecksumTemp[0], MD2_BLOCK*sizeof(TUint)); |
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249 Mem::Copy(&iState[0], &iStateTemp[0], MD2_BLOCK*sizeof(TUint)); |
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250 } |
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251 |
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252 void CMD2::StoreState() |
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253 { |
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254 Mem::Copy(&iDataTemp[0], &iData[0], MD2_BLOCK); |
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255 Mem::Copy(&iChecksumTemp[0], &iChecksum[0], MD2_BLOCK*sizeof(TUint)); |
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256 Mem::Copy(&iStateTemp[0], &iState[0], MD2_BLOCK*sizeof(TUint)); |
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257 } |