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1 /* |
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2 * Copyright (c) 2004 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 // INCLUDES |
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22 #include <e32std.h> |
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23 #include "srtpcryptohandler.h" |
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24 #include "srtpcryptocontext.h" |
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25 #include "srtputils.h" |
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26 #include "srtpstream.h" |
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27 #include "srtpaesctrcrypto.h" |
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28 #include "srtpkeyderivation_aescm128.h" |
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29 #include "srtpcipher_aescm128.h" |
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30 #include "srtpcipher_null.h" |
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31 #include "srtpauthentication_hmac_sha1.h" |
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32 #include "srtpauthentication_null.h" |
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33 #include "srtpauthentication_rcc.h" |
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34 #include "srtppacket.h" |
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35 #include "srtpmasterkey.h" |
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36 #include "srtpmastersalt.h" |
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37 |
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38 // CONSTANTS |
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39 const TInt CSRTPCryptoHandler::iHandlerOffset = _FOFF( CSRTPCryptoHandler, iHandlerLink ); |
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40 |
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41 // --------------------------------------------------------------------------- |
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42 // CSRTPCryptoHandler::CSrtpCryptoHandler |
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43 // --------------------------------------------------------------------------- |
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44 // |
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45 CSRTPCryptoHandler::CSRTPCryptoHandler( CSRTPStream& aStream ) : |
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46 iStream(aStream), |
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47 iCurrentPacket(NULL), |
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48 iKeyDeriver(NULL), |
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49 iAuthenticator(NULL), |
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50 iCipher(NULL), |
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51 iMasterDataUpdated(EFalse), |
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52 iSessionEncrKey(NULL), |
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53 iSessionAuthKey(NULL), |
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54 iSessionSaltKey(NULL), |
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55 iReKey(EFalse), |
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56 iBitmap(NULL), |
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57 iNumPackets(NULL) |
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58 { |
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59 |
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60 } |
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61 |
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62 // --------------------------------------------------------------------------- |
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63 // CSRTPCryptoHandler::~CSrtpCryptoHandler |
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64 // --------------------------------------------------------------------------- |
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65 // |
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66 CSRTPCryptoHandler::~CSRTPCryptoHandler( ) |
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67 { |
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68 if (&Context()) |
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69 { |
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70 Context().RemoveCryptoChangeObserver(this); |
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71 } |
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72 |
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73 delete iCurrentPacket; iCurrentPacket=NULL; |
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74 delete iKeyDeriver; iKeyDeriver=NULL; |
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75 delete iCipher; iCipher=NULL; |
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76 delete iAuthenticator; iAuthenticator=NULL; |
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77 |
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78 DeleteSessionKeys(); |
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79 } |
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80 |
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81 // --------------------------------------------------------------------------- |
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82 // void CSRTPCryptoHandler::SRTPMasterKeyChanged() |
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83 // --------------------------------------------------------------------------- |
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84 // |
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85 void CSRTPCryptoHandler::SRTPMasterKeyChanged() |
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86 { |
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87 iMasterDataUpdated = ETrue; |
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88 //RFC 3711 8.1 |
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89 iReKey= EFalse; |
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90 } |
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91 |
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92 // --------------------------------------------------------------------------- |
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93 // void CSRTPCryptoHandler::SRTPMasterSaltChanged() |
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94 // --------------------------------------------------------------------------- |
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95 // |
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96 void CSRTPCryptoHandler::SRTPMasterSaltChanged() |
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97 { |
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98 iMasterDataUpdated = ETrue; |
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99 |
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100 } |
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101 |
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102 |
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103 // --------------------------------------------------------------------------- |
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104 // CSRTPCryptoHandler::ConstructL |
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105 // --------------------------------------------------------------------------- |
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106 // |
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107 void CSRTPCryptoHandler::ConstructL( ) |
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108 { |
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109 if (!Context().Valid()) |
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110 { |
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111 User::Leave(KErrArgument); |
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112 } |
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113 Context().AddCryptoChangeObserver(this); |
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114 |
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115 iKeyDeriver = CSRTPKeyDerivation_AESCM128::NewL(); |
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116 } |
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117 |
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118 // --------------------------------------------------------------------------- |
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119 // CSRTPCryptoHandler::SetEncAndAlg (); |
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120 // --------------------------------------------------------------------------- |
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121 // |
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122 void CSRTPCryptoHandler::SetEncAndAuthL (TSRTPEncAlg aEngAlg, |
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123 TSRTPAuthAlg aAuthAlg) |
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124 { |
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125 delete iCipher; iCipher=NULL; |
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126 delete iAuthenticator; iAuthenticator=NULL; |
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127 switch (aEngAlg) |
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128 { |
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129 case EEncAES_CM: |
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130 { |
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131 iCipher = CSRTPCipherAESCM128::NewL(); |
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132 break; |
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133 } |
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134 case ENullAlg: |
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135 { |
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136 iCipher = CSRTPCipherNULL::NewL(); |
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137 break; |
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138 } |
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139 default: |
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140 { |
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141 User::Leave(KErrNotSupported); |
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142 } |
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143 } |
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144 |
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145 switch (aAuthAlg) |
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146 { |
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147 case EAuthHMAC_SHA1: |
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148 |
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149 { |
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150 iAuthenticator = CSRTPAuthentication_HMAC_SHA1::NewL(); |
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151 break; |
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152 } |
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153 case EAuthNull: |
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154 case EAuthRCCm3: |
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155 { |
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156 iAuthenticator = CSRTPAuthentication_NULL::NewL(); |
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157 break; |
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158 } |
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159 case EAuthRCCm1: |
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160 case EAuthRCCm2: |
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161 { |
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162 iAuthenticator = CSrtpAuthentication_RCC::NewL(); |
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163 break; |
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164 } |
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165 |
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166 default: |
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167 { |
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168 User::Leave(KErrNotSupported); |
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169 } |
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170 } |
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171 } |
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172 |
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173 // --------------------------------------------------------------------------- |
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174 // CSRTPCryptoHandler::Context() |
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175 // --------------------------------------------------------------------------- |
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176 // |
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177 CSRTPCryptoContext& CSRTPCryptoHandler::Context() |
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178 { |
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179 return iStream.GetCryptoContext(); |
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180 } |
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181 |
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182 // --------------------------------------------------------------------------- |
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183 // CSRTPCryptoHandler::CryptoParams() |
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184 // --------------------------------------------------------------------------- |
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185 // |
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186 const TSrtpCryptoParams& CSRTPCryptoHandler::CryptoParams() |
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187 { |
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188 return Context().CryptoParams(); |
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189 } |
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190 |
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191 // --------------------------------------------------------------------------- |
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192 // CSRTPCryptoHandler::DeleteSessionKeys() |
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193 // --------------------------------------------------------------------------- |
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194 // |
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195 void CSRTPCryptoHandler::DeleteSessionKeys() |
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196 { |
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197 delete iSessionEncrKey; |
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198 delete iSessionAuthKey; |
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199 delete iSessionSaltKey; |
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200 iSessionEncrKey = NULL; |
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201 iSessionAuthKey = NULL; |
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202 iSessionSaltKey = NULL; |
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203 } |
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204 |
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205 // --------------------------------------------------------------------------- |
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206 // CSRTPCryptoHandler::Count_X() |
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207 // --------------------------------------------------------------------------- |
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208 // |
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209 void CSRTPCryptoHandler::Count_X(TUint64 a_R, |
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210 TInt8 aLabel, |
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211 const TUint64 aIndexLength, |
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212 TDes8 &aRes) |
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213 { |
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214 |
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215 TUint64 key_id = TSRTPUtils::Cnt_key_id(aLabel, a_R, aIndexLength); |
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216 |
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217 TSRTPUtils::Cnt_x(key_id, aRes, Context().MasterSalt().MasterSalt()); |
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218 |
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219 } |
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220 |
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221 |
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222 |
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223 // --------------------------------------------------------------------------- |
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224 // CSRTPCryptoHandler::SetROC() |
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225 // |
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226 // --------------------------------------------------------------------------- |
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227 // |
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228 |
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229 void CSRTPCryptoHandler::SetROC( TUint32 aROC ) |
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230 { |
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231 iStream.SetROC(aROC); |
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232 } |
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233 |
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234 // --------------------------------------------------------------------------- |
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235 // CSRTPCryptoHandler::ROC |
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236 // |
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237 // --------------------------------------------------------------------------- |
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238 // |
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239 TUint32 CSRTPCryptoHandler::ROC() const |
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240 { |
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241 return iStream.ROC(); |
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242 } |
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243 |
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244 |
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245 // --------------------------------------------------------------------------- |
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246 // CSRTPCryptoHandler::SSRC |
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247 // |
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248 // --------------------------------------------------------------------------- |
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249 // |
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250 TUint CSRTPCryptoHandler::SSRC() const |
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251 { |
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252 return iStream.SSRC(); |
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253 } |
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254 |
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255 |
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256 |
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257 // --------------------------------------------------------------------------- |
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258 // TInt CSRTPCryptoHandler::ReplayCheck() |
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259 // --------------------------------------------------------------------------- |
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260 // |
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261 TInt CSRTPCryptoHandler::ReplayCheck(TInt aDelta) |
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262 { |
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263 TInt replayWSH= KReplayWindowSize; |
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264 if (CryptoParams().iReplayWindowSizeHint!=replayWSH) |
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265 { |
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266 replayWSH= CryptoParams().iReplayWindowSizeHint; |
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267 } |
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268 //Remember to initial bitmask at the first time |
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269 //if aDelta ==0 it might be just re-sent |
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270 if (aDelta > 0) |
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271 { |
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272 /* new larger sequence number */ |
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273 |
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274 if (aDelta < replayWSH) |
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275 { /* In window */ |
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276 iBitmap <<= aDelta; |
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277 iBitmap |= 1; /* set bit for this packet */ |
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278 } else iBitmap = 1; /* This packet has a "way larger" */ |
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279 |
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280 return KErrNone; /* larger is good */ |
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281 } |
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282 TInt diff= -(aDelta); |
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283 if (diff >= replayWSH) return KErrArgument; /* too old or wrapped */ |
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284 |
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285 if (iBitmap & ((TUint64)1 << diff)) return KErrArgument; /* already seen */ |
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286 //if none of above then will mark as seen in the AddReplayIndex() function |
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287 return KErrNone; /* out of order but good */ |
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288 |
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289 } |