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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 * |
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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 #include <e32std.h> |
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21 #include <hash.h> |
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22 #include <cryptospi/cryptospidef.h> |
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23 #include <cryptospi/cryptohashapi.h> |
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24 #include <cryptospi/plugincharacteristics.h> |
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25 #include "hashshim.h" |
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26 |
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27 |
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28 #define EXPANDLOOP |
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29 |
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30 // |
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31 // HMAC implementation |
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32 // |
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33 |
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34 CHMAC::CHMAC() |
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35 { |
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36 } |
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37 |
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38 |
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39 CHMAC::CHMAC(CMessageDigest* aDigest) |
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40 :CMessageDigest(), |
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41 iDigest(aDigest), |
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42 iInnerPad(KMaxBlockSize), |
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43 iOuterPad(KMaxBlockSize) |
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44 { |
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45 } |
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46 |
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47 CHMAC::CHMAC(const CHMAC& aMD) |
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48 :CMessageDigest(aMD), |
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49 iDigest(NULL), |
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50 iInnerPad(aMD.iInnerPad), |
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51 iOuterPad(aMD.iOuterPad), |
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52 iBlockSize(aMD.iBlockSize) |
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53 { |
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54 } |
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55 |
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56 EXPORT_C CHMAC::~CHMAC(void) |
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57 { |
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58 delete iDigest; |
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59 } |
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60 |
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61 EXPORT_C CHMAC* CHMAC::NewL(const TDesC8& aKey,CMessageDigest* aDigest) |
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62 { |
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63 CHMAC* self = CHMACShim::NewL(aKey, aDigest); |
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64 if (! self) |
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65 { |
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66 // not able to use CryptoSpi, possibly due to an exterally |
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67 // derived legacy class so fallback to old implementation. |
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68 self=new(ELeave) CHMAC(aDigest); |
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69 CleanupStack::PushL(self); |
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70 self->InitialiseL(aKey); |
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71 CleanupStack::Pop(self); |
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72 } |
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73 return self; |
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74 } |
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75 |
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76 |
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77 // These methods are now deprecated. This is because hashes and HMACs |
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78 // should be implemented as plugins to the SPI framework. However, for |
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79 // binary compatibility reasons, these methods must be left here. |
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80 // There are no tests (hence no coverage) for HMACs outside the plugin |
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81 // framework, but this original code is left unmodified. |
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82 // |
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83 #ifdef _BullseyeCoverage |
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84 #pragma suppress_warnings on |
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85 #pragma BullseyeCoverage off |
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86 #pragma suppress_warnings off |
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87 #endif |
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88 |
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89 |
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90 void CHMAC::InitialiseL(const TDesC8& aKey) |
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91 { |
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92 InitBlockSizeL(); |
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93 // initialisation |
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94 if (iDigest) |
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95 { |
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96 iDigest->Reset(); |
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97 if( (TUint32)aKey.Size() > iBlockSize) |
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98 { |
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99 iInnerPad = iDigest->Final(aKey); |
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100 } |
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101 else |
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102 { |
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103 iInnerPad = aKey; |
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104 } |
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105 |
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106 TUint i; |
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107 for (i=iInnerPad.Size();i<iBlockSize;i++) |
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108 iInnerPad.Append(0); |
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109 |
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110 iOuterPad=iInnerPad; |
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111 |
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112 const TUint8 Magic1=0x36, Magic2=0x5c; |
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113 for (i=0;i<iBlockSize;i++) |
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114 { |
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115 iInnerPad[i]^=Magic1; |
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116 iOuterPad[i]^=Magic2; |
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117 } |
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118 //start inner hash |
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119 iDigest->Hash(iInnerPad); |
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120 } |
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121 } |
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122 |
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123 void CHMAC::InitBlockSizeL() |
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124 { |
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125 if (iDigest) |
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126 { |
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127 iBlockSize = iDigest->BlockSize(); |
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128 } |
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129 if(iBlockSize > KMaxBlockSize) |
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130 { |
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131 User::Leave(KErrNotSupported); |
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132 } |
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133 |
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134 iInnerPad.SetLength(iBlockSize); |
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135 iOuterPad.SetLength(iBlockSize); |
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136 iInnerPadCopy.SetLength(iBlockSize); |
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137 iOuterPadCopy.SetLength(iBlockSize); |
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138 } |
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139 |
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140 EXPORT_C CMessageDigest* CHMAC::CopyL(void) |
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141 { |
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142 CHMAC* that=new(ELeave) CHMAC(*this); |
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143 CleanupStack::PushL(that); |
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144 that->iDigest=iDigest ? iDigest->CopyL() : NULL; |
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145 CleanupStack::Pop(); |
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146 return that; |
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147 } |
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148 |
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149 EXPORT_C CMessageDigest* CHMAC::ReplicateL(void) |
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150 { |
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151 CHMAC* that=new(ELeave) CHMAC(*this); |
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152 CleanupStack::PushL(that); |
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153 that->iDigest=iDigest ? iDigest->ReplicateL() : NULL; |
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154 that->Reset(); |
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155 CleanupStack::Pop(); |
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156 return that; |
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157 } |
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158 |
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159 EXPORT_C TInt CHMAC::BlockSize(void) |
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160 { |
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161 return iBlockSize; |
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162 } |
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163 |
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164 EXPORT_C TInt CHMAC::HashSize(void) |
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165 { |
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166 return iDigest ? iDigest->HashSize() : 0; |
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167 } |
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168 |
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169 EXPORT_C void CHMAC::Reset(void) |
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170 { |
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171 if (iDigest) |
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172 { |
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173 iDigest->Reset(); |
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174 iDigest->Update(iInnerPad); |
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175 } |
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176 } |
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177 |
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178 // JCS, There may be a more efficient method but I can't find it |
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179 // because using the DoFinal/DoUpdate functions directly calls |
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180 // Store/Restore at inappropriate times and scribbles over stored |
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181 // data |
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182 // This is the only way I've found to both generate a hash value |
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183 // and get this in the correctly updated state |
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184 EXPORT_C TPtrC8 CHMAC::Hash(const TDesC8& aMessage) |
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185 { |
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186 TPtrC8 ptr(KNullDesC8()); |
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187 TPtrC8 finalPtr(KNullDesC8()); |
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188 StoreState(); |
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189 if (iDigest) |
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190 { |
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191 ptr.Set(iDigest->Final(aMessage)); |
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192 iDigest->Update(iOuterPad); |
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193 finalPtr.Set(iDigest->Final(ptr)); |
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194 } |
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195 |
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196 RestoreState(); |
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197 |
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198 if(iDigest) |
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199 { |
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200 iDigest->Update(aMessage); |
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201 } |
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202 |
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203 return (finalPtr); |
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204 } |
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205 |
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206 EXPORT_C void CHMAC::Update(const TDesC8& aMessage) |
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207 { |
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208 if(iDigest) |
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209 { |
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210 iDigest->Update(aMessage); |
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211 } |
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212 } |
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213 |
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214 EXPORT_C TPtrC8 CHMAC::Final(const TDesC8& aMessage) |
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215 { |
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216 TPtrC8 ptr(KNullDesC8()); |
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217 if(iDigest) |
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218 { |
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219 ptr.Set(iDigest->Final(aMessage)); |
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220 iDigest->Update(iOuterPad); |
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221 iDigest->Final(ptr); |
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222 Reset(); |
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223 } |
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224 return (ptr); |
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225 } |
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226 |
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227 EXPORT_C TPtrC8 CHMAC::Final() |
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228 { |
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229 TPtrC8 ptr(KNullDesC8()); |
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230 if(iDigest) |
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231 { |
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232 ptr.Set(iDigest->Final()); |
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233 iDigest->Update(iOuterPad); |
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234 iDigest->Final(ptr); |
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235 Reset(); |
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236 } |
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237 return (ptr); |
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238 } |
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239 |
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240 void CHMAC::RestoreState() |
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241 { |
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242 iOuterPad.Copy(iOuterPadCopy); |
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243 iInnerPad.Copy(iInnerPadCopy); |
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244 if (iDigest) |
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245 iDigest->RestoreState(); |
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246 } |
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247 |
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248 void CHMAC::StoreState() |
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249 { |
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250 iOuterPadCopy.Copy(iOuterPad); |
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251 iInnerPadCopy.Copy(iInnerPad); |
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252 if (iDigest) |
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253 iDigest->StoreState(); |
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254 } |
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255 |
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256 |