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1 /* |
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2 * Copyright (c) 2006-2007 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 "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 |
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21 #include "natfwunsaffingerprintattribute.h" |
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22 #include "natfwunsafmessage.h" |
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23 #include "natfwunsafutils.h" |
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24 #include "natfwunsaflog.h" |
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25 |
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26 // ----------------------------------------------------------------------------- |
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27 // CNATFWUNSAFFingerprintAttribute::DecodeL |
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28 // ----------------------------------------------------------------------------- |
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29 // |
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30 CNATFWUNSAFFingerprintAttribute* |
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31 CNATFWUNSAFFingerprintAttribute::DecodeL(const TDesC8& aValue) |
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32 { |
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33 CNATFWUNSAFFingerprintAttribute* self = |
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34 new (ELeave) CNATFWUNSAFFingerprintAttribute(); |
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35 CleanupStack::PushL(self); |
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36 self->DecodeValueL(aValue); |
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37 CleanupStack::Pop(self); |
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38 return self; |
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39 } |
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40 |
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41 // ----------------------------------------------------------------------------- |
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42 // CNATFWUNSAFFingerprintAttribute::NewL |
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43 // ----------------------------------------------------------------------------- |
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44 // |
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45 CNATFWUNSAFFingerprintAttribute* |
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46 CNATFWUNSAFFingerprintAttribute::NewL(CBufBase& aNATFWUNSAFMessage) |
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47 { |
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48 CNATFWUNSAFFingerprintAttribute* self = |
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49 CNATFWUNSAFFingerprintAttribute::NewLC(aNATFWUNSAFMessage); |
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50 CleanupStack::Pop(self); |
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51 return self; |
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52 } |
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53 |
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54 // ----------------------------------------------------------------------------- |
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55 // CNATFWUNSAFFingerprintAttribute::NewLC |
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56 // ----------------------------------------------------------------------------- |
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57 // |
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58 CNATFWUNSAFFingerprintAttribute* |
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59 CNATFWUNSAFFingerprintAttribute::NewLC(CBufBase& aNATFWUNSAFMessage) |
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60 { |
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61 CNATFWUNSAFFingerprintAttribute* self = |
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62 new (ELeave) CNATFWUNSAFFingerprintAttribute(); |
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63 CleanupStack::PushL(self); |
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64 self->ConstructL(aNATFWUNSAFMessage); |
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65 return self; |
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66 } |
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67 |
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68 // ----------------------------------------------------------------------------- |
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69 // CNATFWUNSAFFingerprintAttribute::DecodeAttributeL |
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70 // ----------------------------------------------------------------------------- |
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71 // |
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72 CNATFWUNSAFAttribute* |
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73 CNATFWUNSAFFingerprintAttribute::DecodeAttributeL( |
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74 const TDesC8& aByteStream) |
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75 { |
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76 CheckLengthL(aByteStream); |
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77 |
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78 return DecodeL(aByteStream.Mid(EValueOffset)); |
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79 } |
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80 |
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81 // ----------------------------------------------------------------------------- |
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82 // CNATFWUNSAFFingerprintAttribute::CNATFWUNSAFFingerprintAttribute |
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83 // ----------------------------------------------------------------------------- |
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84 // |
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85 CNATFWUNSAFFingerprintAttribute::CNATFWUNSAFFingerprintAttribute() |
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86 { |
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87 |
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88 } |
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89 |
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90 // ----------------------------------------------------------------------------- |
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91 // CNATFWUNSAFFingerprintAttribute::ConstructL |
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92 // Update message header's length field to include the FINGERPRINT before |
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93 // computing the CRC-32. |
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94 // ----------------------------------------------------------------------------- |
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95 // |
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96 void CNATFWUNSAFFingerprintAttribute::ConstructL(CBufBase& aNATFWUNSAFMessage) |
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97 { |
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98 __ASSERT_ALWAYS(aNATFWUNSAFMessage.Size(), User::Leave(KErrArgument)); |
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99 TInt length = CNATFWUNSAFMessage::MessageLength(aNATFWUNSAFMessage.Ptr(0)); |
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100 CNATFWUNSAFMessage::SetMessageLength(aNATFWUNSAFMessage, |
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101 length + EValueOffset + EAttributeValueSize); |
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102 |
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103 ComputeCRC32(aNATFWUNSAFMessage, iCRC); |
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104 } |
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105 |
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106 // ----------------------------------------------------------------------------- |
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107 // CNATFWUNSAFFingerprintAttribute::~CNATFWUNSAFFingerprintAttribute |
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108 // ----------------------------------------------------------------------------- |
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109 // |
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110 CNATFWUNSAFFingerprintAttribute::~CNATFWUNSAFFingerprintAttribute() |
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111 { |
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112 } |
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113 |
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114 // ----------------------------------------------------------------------------- |
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115 // CNATFWUNSAFFingerprintAttribute::Type |
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116 // ----------------------------------------------------------------------------- |
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117 // |
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118 CNATFWUNSAFAttribute::TType CNATFWUNSAFFingerprintAttribute::Type() const |
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119 { |
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120 return EFingerprint; |
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121 } |
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122 |
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123 // ----------------------------------------------------------------------------- |
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124 // CNATFWUNSAFFingerprintAttribute::EncodeValueL |
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125 // ----------------------------------------------------------------------------- |
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126 // |
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127 HBufC8* CNATFWUNSAFFingerprintAttribute::EncodeValueL() const |
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128 { |
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129 HBufC8* encodedValue = HBufC8::NewLC(EAttributeValueSize); |
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130 |
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131 TPtr8 ptr = encodedValue->Des(); |
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132 ptr.FillZ(EAttributeValueSize); |
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133 |
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134 TUint32 value(iCRC); |
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135 NATFWUNSAFUtils::WriteNetworkOrder32L(ptr, 0, value); |
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136 |
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137 CleanupStack::Pop(encodedValue); |
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138 return encodedValue; |
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139 } |
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140 |
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141 // ----------------------------------------------------------------------------- |
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142 // CNATFWUNSAFFingerprintAttribute::CheckLengthL |
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143 // This attribute has a fixed length |
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144 // ----------------------------------------------------------------------------- |
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145 // |
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146 void CNATFWUNSAFFingerprintAttribute::CheckLengthL( |
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147 const TDesC8& aByteStream) |
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148 { |
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149 __ASSERT_ALWAYS(ParseLengthL(aByteStream) == EAttributeValueSize, |
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150 User::Leave(KErrCorrupt)); |
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151 } |
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152 |
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153 // ----------------------------------------------------------------------------- |
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154 // CNATFWUNSAFFingerprintAttribute::CheckFingerprintL |
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155 // Exclude FINGERPRINT attribute from CRC-32 computing. It is located at the |
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156 // end of the message. |
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157 // ----------------------------------------------------------------------------- |
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158 // |
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159 EXPORT_C TBool CNATFWUNSAFFingerprintAttribute::CheckFingerprintL( |
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160 const TDesC8& aNATFWUNSAFMessage) const |
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161 { |
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162 TInt KFingerprintSize = static_cast<TInt>(EValueOffset) + |
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163 static_cast<TInt>(EAttributeValueSize); |
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164 //Check there is enough data |
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165 __ASSERT_ALWAYS(aNATFWUNSAFMessage.Length() >= KFingerprintSize, |
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166 User::Leave(KErrArgument)); |
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167 |
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168 CBufBase* message = CBufFlat::NewL( |
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169 aNATFWUNSAFMessage.Length() - KFingerprintSize); |
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170 CleanupStack::PushL(message); |
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171 message->InsertL(0, |
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172 aNATFWUNSAFMessage, |
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173 aNATFWUNSAFMessage.Length() - KFingerprintSize); |
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174 |
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175 TUint32 crc(0); |
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176 ComputeCRC32(*message, crc); |
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177 |
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178 TBool match = (crc == iCRC); |
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179 NATFWUNSAF_INTLOG("Checking FINGERPRINT, match", match) |
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180 |
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181 CleanupStack::PopAndDestroy(message); |
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182 return match; |
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183 } |
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184 |
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185 // ----------------------------------------------------------------------------- |
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186 // CNATFWUNSAFFingerprintAttribute::DecodeValueL |
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187 // ----------------------------------------------------------------------------- |
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188 // |
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189 void CNATFWUNSAFFingerprintAttribute::DecodeValueL(const TDesC8& aValue) |
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190 { |
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191 __ASSERT_ALWAYS(aValue.Length() == EAttributeValueSize, |
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192 User::Leave(KErrCorrupt)); |
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193 iCRC = BigEndian::Get32(aValue.Ptr()); |
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194 } |
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195 |
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196 // ----------------------------------------------------------------------------- |
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197 // CNATFWUNSAFFingerprintAttribute::ComputeCRC32 |
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198 // ----------------------------------------------------------------------------- |
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199 // |
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200 void CNATFWUNSAFFingerprintAttribute::ComputeCRC32( |
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201 CBufBase& aNATFWUNSAFMessage, |
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202 TUint32& aCRC) const |
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203 { |
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204 // Perform the CCITT CRC-32 checksum on the message |
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205 Mem::Crc32(aCRC, aNATFWUNSAFMessage.Ptr(0).Ptr(), |
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206 sizeof(aNATFWUNSAFMessage)); |
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207 // XOR according to RFC3489-bis05 |
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208 aCRC ^= EXORedValue; |
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209 } |