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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: SRTCP-specific packet handling routines. |
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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 "srtppacketsrtcp.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 "srtpmasterkey.h" |
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27 #include "srtpmastersalt.h" |
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28 |
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29 _LIT8( KMKINULL, "NULL"); |
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30 // ----------------------------------------------------------------------------- |
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31 // CSRTPPacketSRTCP::CSRTPPacketSRTCP |
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32 // ----------------------------------------------------------------------------- |
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33 // |
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34 CSRTPPacketSRTCP::CSRTPPacketSRTCP(const TDesC8& aPacket, |
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35 CSRTPCryptoHandler& aHandler) |
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36 : CSRTPPacketRTCP(aPacket, aHandler), |
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37 iAuthenticationTag(TPtrC8()), |
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38 iMasterKeyIdentifier(TPtrC8()) |
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39 { |
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40 |
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41 } |
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42 |
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43 // ----------------------------------------------------------------------------- |
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44 // CSRTPPacketSRTCP::~CSRTPPacketSRTCP |
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45 // ----------------------------------------------------------------------------- |
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46 // |
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47 CSRTPPacketSRTCP::~CSRTPPacketSRTCP() |
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48 { |
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49 |
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50 } |
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51 |
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52 // --------------------------------------------------------------------------- |
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53 // Two-phased constructor. |
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54 // |
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55 // --------------------------------------------------------------------------- |
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56 // |
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57 CSRTPPacketSRTCP* CSRTPPacketSRTCP::NewL(const TDesC8& aPacket, |
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58 CSRTPCryptoHandler& aHandler) |
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59 { |
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60 CSRTPPacketSRTCP* self = new( ELeave )CSRTPPacketSRTCP( aPacket, aHandler); |
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61 CleanupStack::PushL( self ); |
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62 self->ConstructL(); |
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63 CleanupStack::Pop( self ); |
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64 return self; |
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65 } |
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66 |
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67 // ----------------------------------------------------------------------------- |
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68 // void CSRTPPacketSRTCP::ConstructL |
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69 // ----------------------------------------------------------------------------- |
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70 // |
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71 void CSRTPPacketSRTCP::ConstructL() |
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72 { |
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73 CSRTPPacketRTCP::ConstructL(); |
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74 UpdatePayloadLength(); |
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75 UpdatePayload(); |
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76 UpdateAuthenticationTag(); |
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77 UpdateMasterKeyIdentifier(); |
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78 UpdatePacketIndex(); |
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79 } |
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80 |
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81 // --------------------------------------------------------------------------- |
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82 // CSRTPPacketSRTCP::AuthenticationTag() |
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83 // --------------------------------------------------------------------------- |
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84 // |
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85 TPtrC8 CSRTPPacketSRTCP::AuthenticationTag() |
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86 { |
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87 return iAuthenticationTag; |
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88 } |
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89 |
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90 |
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91 // --------------------------------------------------------------------------- |
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92 // CSRTPPacketSRTCP::MasterKeyIdentifier() |
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93 // --------------------------------------------------------------------------- |
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94 // |
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95 TPtrC8 CSRTPPacketSRTCP::MasterKeyIdentifier() |
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96 { |
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97 return iMasterKeyIdentifier; |
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98 } |
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99 |
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100 // --------------------------------------------------------------------------- |
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101 // CSRTPPacketSRTCP::UpdatePayloadLength() |
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102 // --------------------------------------------------------------------------- |
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103 // |
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104 void CSRTPPacketSRTCP::UpdatePayloadLength() |
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105 { |
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106 // the real RTCP packet length is |
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107 // the packet size - header - MKI - Auth tag- packetIndex |
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108 TUint authTagLen = iHandler.Context().CryptoParams().iSrtcpAuthTagLen/8; |
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109 TUint mkiLen=0; |
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110 mkiLen= iHandler.Context().MasterKey().MKI().Length(); |
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111 TUint deductedLength = iHeaderLength + mkiLen + authTagLen + KSRTCPPacketIndexLength4; |
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112 iPayloadLength = iPacket.Length() - deductedLength; |
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113 |
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114 if ( iPacket.Length() <= iHeaderLength ) |
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115 { |
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116 iPayloadLength = 0; |
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117 } |
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118 // iPayloadLength should be bigger than 0 |
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119 } |
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120 |
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121 |
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122 // --------------------------------------------------------------------------- |
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123 // CSRTPPacketSRTCP::CountDecryptedPacketSize() |
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124 // --------------------------------------------------------------------------- |
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125 // |
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126 TUint CSRTPPacketSRTCP::CountDecryptedPacketSize() |
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127 { |
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128 return iHeaderLength + iPayloadLength; |
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129 } |
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130 |
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131 // --------------------------------------------------------------------------- |
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132 // CSRTPPacketSRTCP::CreateDecryptedPacketL() |
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133 // --------------------------------------------------------------------------- |
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134 // |
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135 HBufC8* CSRTPPacketSRTCP::CreateDecryptedPacketL(TUint8* aDecryptedPayloadPtr) |
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136 { |
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137 // create decrypted RTCP packet |
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138 // first count needed packet size |
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139 TUint rtpPacketSize = CountDecryptedPacketSize(); |
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140 |
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141 return CopyHeaderAndPayloadL(rtpPacketSize, aDecryptedPayloadPtr); |
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142 |
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143 } |
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144 |
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145 // --------------------------------------------------------------------------- |
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146 // CSRTPPacketSRTCP::UpdateAuthenticationTag() |
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147 // --------------------------------------------------------------------------- |
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148 // |
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149 void CSRTPPacketSRTCP::UpdateAuthenticationTag() |
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150 { |
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151 TPtrC8 authTag = GetAuthenticationTag(); |
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152 if (authTag.Compare(KNullDesC8)) |
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153 { |
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154 iAuthenticationTag.Set(authTag.Ptr(), authTag.Length()); |
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155 } |
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156 |
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157 } |
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158 // --------------------------------------------------------------------------- |
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159 // CSRTPPacketSRTCP::GetAuthenticationTagL() |
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160 // --------------------------------------------------------------------------- |
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161 // |
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162 TPtrC8 CSRTPPacketSRTCP::GetAuthenticationTag() |
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163 { |
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164 // for RTCP, authTagLength existed only with HMAC_SHA1 |
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165 if ((iHandler.Context().CryptoParams().iSrtcpAuthTagLen > 0) && |
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166 (iHandler.Context().CryptoParams().iSrtcpAuthAlg != EAuthNull)) |
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167 { |
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168 TUint authTagLength = iHandler.Context().CryptoParams().iSrtcpAuthTagLen; |
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169 |
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170 TUint authTagLenInBytes = authTagLength/8; |
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171 |
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172 if (iHandler.Context().CryptoParams().iSrtcpAuthAlg != EAuthHMAC_SHA1) |
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173 { |
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174 authTagLenInBytes = KSRTPAuthTagLength80/8; |
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175 } |
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176 |
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177 TUint packetLength = iPacket.Length(); |
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178 TUint position = packetLength - authTagLenInBytes; |
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179 |
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180 return iPacket.Mid(position,authTagLenInBytes); |
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181 } |
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182 //In case of the other Authentication mode |
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183 TPtrC8 authTagNull(KNullDesC8); |
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184 return authTagNull; |
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185 } |
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186 |
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187 // --------------------------------------------------------------------------- |
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188 // CSRTPPacketSRTCP::GetMasterKeyIdentifier() |
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189 // --------------------------------------------------------------------------- |
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190 // |
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191 TPtrC8 CSRTPPacketSRTCP::GetMasterKeyIdentifier() |
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192 { |
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193 if(iHandler.Context().MasterKey().MKI()!= KNullDesC8) |
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194 { |
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195 TInt mkiLength = iHandler.Context().MasterKey().MKI().Length(); |
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196 if (iHandler.Context().MasterKey().MKI().Length() > 0) |
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197 { |
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198 TUint authTagLength = iHandler.Context().CryptoParams().iSrtcpAuthTagLen; |
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199 TUint authTagLenInBytes = authTagLength/8; |
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200 TUint position = iPacket.Length() - authTagLenInBytes - mkiLength; |
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201 |
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202 return iPacket.Mid(position,mkiLength); |
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203 } |
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204 } |
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205 TPtrC8 mkiNull( KMKINULL ); |
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206 return mkiNull; |
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207 } |
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208 |
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209 // --------------------------------------------------------------------------- |
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210 // CSRTPPacketSRTCP::UpdateMasterKeyIdentifier() |
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211 // --------------------------------------------------------------------------- |
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212 // |
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213 void CSRTPPacketSRTCP::UpdateMasterKeyIdentifier() |
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214 { |
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215 TPtrC8 mki = GetMasterKeyIdentifier(); |
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216 if (mki.Compare( KMKINULL )) |
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217 { |
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218 iMasterKeyIdentifier.Set(mki.Ptr(),mki.Length()); |
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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 // CSRTPPacketRTP::UpdatePacketIndex() |
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224 // --------------------------------------------------------------------------- |
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225 // |
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226 void CSRTPPacketSRTCP::UpdatePacketIndex() |
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227 { |
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228 const TUint8 *pointer = iDataP; |
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229 pointer+=iHeaderLength; |
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230 pointer+= iPayloadLength;//payload length as SRTCP report length |
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231 |
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232 |
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233 iPacketIndex=static_cast<TUint32>(TSRTPUtils::Read32(pointer)); |
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234 } |