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1 /* |
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2 * Copyright (c) 2002-2009 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 * |
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16 */ |
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17 |
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18 |
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19 #include <e32std.h> |
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20 #include <random.h> |
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21 |
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22 #include "pbencryptor.h" |
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23 #include "pbesymmetricfactory.h" |
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24 |
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25 #ifdef SYMBIAN_ENABLE_SPLIT_HEADERS |
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26 /** The maximum block size supported (in bytes) */ |
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27 const TUint KMaxBlockSizeSupported = 32; |
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28 #endif |
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29 |
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30 EXPORT_C CPBEncryptorSet* CPBEncryptorSet::NewL( |
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31 const TPBECipher aCipher, const TDesC8& aKey) |
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32 { |
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33 CPBEncryptorSet* self = NewLC(aCipher, aKey); |
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34 CleanupStack::Pop(); |
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35 return self; |
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36 } |
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37 |
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38 EXPORT_C CPBEncryptorSet* CPBEncryptorSet::NewLC( |
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39 const TPBECipher aCipher, const TDesC8& aKey) |
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40 { |
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41 CPBEncryptorSet* self = new(ELeave) CPBEncryptorSet; |
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42 CleanupStack::PushL(self); |
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43 |
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44 self->ConstructL(aCipher, aKey); |
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45 |
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46 return self; |
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47 } |
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48 |
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49 void CPBEncryptorSet::ConstructL(const TPBECipher aCipher,const TDesC8& aKey) |
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50 { |
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51 TInt blocksize = PBE::GetBlockBytes(aCipher); |
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52 iIV = HBufC8::NewMaxL(blocksize); |
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53 TPtr8 iv = iIV->Des(); |
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54 TRandom::RandomL(iv); |
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55 |
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56 iCipher = PBE::MakeEncryptorL(aCipher, aKey, iv); |
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57 } |
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58 |
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59 void CPBEncryptorSet::Process(const TDesC8& aInput, TDes8& aOutput) |
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60 { |
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61 if(!iIVSent) |
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62 { |
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63 aOutput.Append(*iIV); |
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64 iIVSent = ETrue; |
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65 } |
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66 iCipher->Process(aInput, aOutput); |
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67 } |
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68 |
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69 void CPBEncryptorSet::ProcessFinalL(const TDesC8& aInput, |
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70 TDes8& aOutput) |
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71 { |
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72 if(!iIVSent) |
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73 { |
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74 aOutput.Append(*iIV); |
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75 iIVSent = ETrue; |
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76 } |
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77 |
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78 iCipher->ProcessFinalL(aInput, aOutput); |
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79 } |
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80 |
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81 |
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82 CPBEncryptorSet::CPBEncryptorSet() : iIVSent(EFalse) |
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83 { |
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84 } |
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85 |
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86 CPBEncryptorSet::~CPBEncryptorSet() |
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87 { |
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88 delete iIV; |
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89 delete iCipher; // Don't delete iCBCDecryptor, this belongs to iCipher |
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90 } |
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91 |
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92 TInt CPBEncryptorSet::MaxOutputLength(TUint aMaxInputLength) const |
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93 { |
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94 if(iIVSent) |
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95 { |
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96 return (iCipher->MaxOutputLength(aMaxInputLength)); |
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97 } |
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98 else |
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99 {// If we've not sent the iv yet then its the length |
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100 // from the cipher plus a blocksize for the iv |
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101 return (iCipher->MaxOutputLength(aMaxInputLength + iCipher->BlockSize())); |
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102 } |
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103 } |
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104 |
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105 TInt CPBEncryptorSet::MaxFinalOutputLength(TUint aMaxInputLength) const |
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106 { |
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107 if(iIVSent) |
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108 { |
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109 return (iCipher->MaxFinalOutputLength(aMaxInputLength)); |
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110 } |
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111 else |
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112 {// If we've not sent the iv yet then its the length |
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113 // from the cipher plus a blocksize for the iv |
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114 return (iCipher->MaxFinalOutputLength(aMaxInputLength + iCipher->BlockSize())); |
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115 } |
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116 } |
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117 |
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118 EXPORT_C CPBDecryptorSet* CPBDecryptorSet::NewL(const TPBECipher aCipher, |
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119 const TDesC8& aKey) |
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120 { |
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121 CPBDecryptorSet* self = NewLC(aCipher, aKey); |
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122 CleanupStack::Pop(); |
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123 return self; |
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124 } |
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125 |
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126 EXPORT_C CPBDecryptorSet* CPBDecryptorSet::NewLC(const TPBECipher aCipher, |
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127 const TDesC8& aKey) |
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128 { |
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129 CPBDecryptorSet* self = new(ELeave) CPBDecryptorSet; |
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130 CleanupStack::PushL(self); |
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131 TBuf8<KMaxBlockSizeSupported> fakeIV; |
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132 fakeIV.SetLength(PBE::GetBlockBytes(aCipher)); |
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133 self->ConstructL(aCipher, aKey, fakeIV); |
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134 return self; |
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135 } |
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136 |
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137 void CPBDecryptorSet::ConstructL(const TPBECipher aCipher, |
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138 const TDesC8& aKey, const TDesC8& aIV) |
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139 { |
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140 iCipher = PBE::MakeDecryptorL(aCipher, aKey, aIV); |
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141 iIVBuf = HBufC8::NewL(PBE::GetBlockBytes(aCipher)); |
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142 } |
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143 |
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144 void CPBDecryptorSet::Process(const TDesC8& aInput, TDes8& aOutput) |
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145 { |
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146 TPtrC8 input = ProcessIV(aInput); |
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147 iCipher->Process(input, aOutput); |
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148 } |
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149 |
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150 void CPBDecryptorSet::ProcessFinalL(const TDesC8& aInput, TDes8& aOutput) |
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151 { |
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152 TPtrC8 input = ProcessIV(aInput); |
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153 iCipher->ProcessFinalL(input, aOutput); |
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154 } |
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155 |
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156 TPtrC8 CPBDecryptorSet::ProcessIV(const TDesC8& aInput) |
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157 { |
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158 if(!iIVSent) |
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159 { |
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160 TPtr8 iIVBufPtr(iIVBuf->Des()); |
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161 if(aInput.Length() + iIVBufPtr.Length() < iCipher->BlockSize()) |
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162 { |
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163 iIVBufPtr.Append(aInput); |
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164 return TPtrC8(); |
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165 } |
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166 else |
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167 { |
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168 TInt rem = iCipher->BlockSize() - iIVBufPtr.Length(); |
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169 iIVBufPtr.Append(aInput.Mid(0, rem)); |
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170 CBufferedDecryptor* blockDecryptor = static_cast<CBufferedDecryptor*>(iCipher); |
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171 static_cast<CModeCBCDecryptor*>(blockDecryptor->BlockTransformer())->SetIV(iIVBufPtr); |
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172 iIVSent = ETrue; |
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173 return aInput.Mid(rem); |
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174 } |
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175 } |
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176 else |
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177 { |
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178 return aInput; |
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179 } |
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180 } |
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181 |
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182 CPBDecryptorSet::CPBDecryptorSet() : iIVSent(EFalse) |
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183 { |
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184 } |
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185 |
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186 CPBDecryptorSet::~CPBDecryptorSet() |
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187 { |
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188 delete iCipher; |
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189 //iCipher owns iCBCDecryptor we _don't_ need to delete it |
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190 delete iIVBuf; |
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191 } |
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192 |
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193 TInt CPBDecryptorSet::MaxOutputLength(TUint aMaxInputLength) const |
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194 { |
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195 if(iIVSent) |
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196 { |
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197 return (iCipher->MaxOutputLength(aMaxInputLength)); |
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198 } |
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199 else // if we haven't sent the iv yet, then the length the max length of the |
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200 { // cipher minus a BlockSize where the IV was sitting (as the iv would be part |
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201 // of the length they've sent us) |
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202 return (iCipher->MaxOutputLength(aMaxInputLength - iCipher->BlockSize())); |
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203 } |
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204 } |
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205 |
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206 TInt CPBDecryptorSet::MaxFinalOutputLength(TUint aMaxInputLength) const |
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207 { |
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208 if(iIVSent) |
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209 { |
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210 return (iCipher->MaxFinalOutputLength(aMaxInputLength)); |
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211 } |
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212 else // if we haven't sent the iv yet, then the length the max length of the |
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213 { // cipher minus a BlockSize where the IV was sitting (as the iv would be part |
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214 // of the length they've sent us) |
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215 return (iCipher->MaxFinalOutputLength(aMaxInputLength - iCipher->BlockSize())); |
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216 } |
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217 } |