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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 @file |
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21 */ |
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22 |
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23 #include "randsvr.h" |
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24 #include "randcliserv.h" |
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25 #include <e32math.h> |
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26 #include "randsvrimpl.h" |
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27 |
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28 |
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29 //const TInt KFastTickTimer=1000000; // These are testing numbers! |
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30 //const TInt KSlowTickTimer=30000000; |
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31 const TInt KThreshold=1024; |
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32 |
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33 const TInt KFastTickTimer=30000000; // These are the real numbers! |
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34 const TInt KSlowTickTimer=0x7fffffff; |
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35 |
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36 |
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37 void SignalClient() |
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38 // |
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39 // Signal the owning thread that the server has started successfully |
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40 // This may itself fail |
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41 // |
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42 { |
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43 RProcess::Rendezvous(KErrNone); |
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44 } |
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45 |
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46 |
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47 EXPORT_C TInt RunRandomServer(TAny* /*aUnused*/) |
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48 { |
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49 CTrapCleanup* cleanup=CTrapCleanup::New(); |
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50 if (!cleanup) |
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51 { |
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52 return KErrNoMemory; |
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53 } |
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54 |
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55 TInt ret = User::RenameThread(KRandomServerName); |
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56 |
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57 __ASSERT_ALWAYS(ret==KErrNone,User::Panic(KRandomServerName,KErrServerTerminated)); |
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58 |
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59 if (CRandomScheduler::New()) |
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60 return KErrNoMemory; |
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61 ret = CRandomServer::New(); |
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62 if (ret != KErrNone ) |
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63 return ret; |
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64 // Initialisation complete, now signal the client |
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65 SignalClient(); |
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66 |
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67 CRandomScheduler::Start(); |
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68 delete cleanup; |
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69 return KErrNone; |
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70 } |
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71 |
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72 TBool CRandomScheduler::New(void) |
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73 { |
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74 CRandomScheduler* rs; |
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75 rs=new CRandomScheduler; |
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76 CRandomScheduler::Install(rs); |
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77 return (rs == NULL); |
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78 } |
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79 |
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80 void CRandomScheduler::Error(TInt /*aError*/) const |
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81 { |
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82 User::Panic(KRandomServerName, 3); |
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83 } |
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84 |
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85 CRandomServer::CRandomServer(void) : CServer2(EPriorityLow) |
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86 { |
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87 } |
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88 |
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89 CRandomServer::~CRandomServer(void) |
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90 { |
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91 // This should never happen....but in case it does: |
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92 delete iHash; |
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93 delete iTicker; |
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94 delete iPool; |
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95 } |
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96 |
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97 TInt CRandomServer::New(void) |
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98 { |
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99 CRandomServer* self; |
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100 self=new CRandomServer; |
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101 if (!self) |
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102 { |
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103 return KErrNoMemory; |
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104 } |
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105 TRAPD(ret,self->ConstructL()); |
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106 if (ret) |
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107 { |
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108 return ret; |
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109 } |
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110 |
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111 return self->Start(KRandomServerName); |
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112 } |
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113 |
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114 void CRandomServer::ConstructL(void) |
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115 { |
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116 iPool=new (ELeave) TUint8[KRandomPoolSize]; |
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117 iHash=CSHA1::NewL(); |
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118 iPoolIn=0; |
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119 iPoolOut=0; |
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120 iTicker=CPeriodic::NewL(EPriorityLow); |
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121 TCallBack callback(Tick,this); |
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122 iTicker->Start(KFastTickTimer,KFastTickTimer,callback); // **** these figures might need tweaking! |
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123 iQuality=0; |
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124 iFast=ETrue; |
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125 } |
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126 |
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127 TInt CRandomServer::Tick(TAny* aServer) |
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128 { |
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129 CRandomServer* svr=(CRandomServer*)aServer; |
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130 svr->Stir(); |
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131 svr->iQuality+=30; |
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132 if (svr->iFast) |
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133 { |
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134 if (svr->iQuality>KThreshold) |
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135 { |
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136 TCallBack callback(Tick,svr); |
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137 svr->iTicker->Cancel(); |
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138 svr->iTicker->Start(KSlowTickTimer,KSlowTickTimer,callback); // **** these figures might need tweaking! |
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139 svr->iFast=EFalse; |
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140 } |
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141 } |
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142 if (svr->iQuality>(KRandomPoolSize<<3)) |
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143 { |
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144 svr->iQuality=(KRandomPoolSize<<3); |
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145 } |
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146 return ETrue; |
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147 } |
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148 |
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149 CSession2* CRandomServer::NewSessionL(const TVersion& /*aVersion*/, const RMessage2& /*aMessage*/) const |
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150 { |
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151 return CRandomSession::NewL(const_cast<CRandomServer*>(this)); |
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152 //CRandomSession::NewL(CONST_CAST(CRandomServer*,this),Message().Client()); |
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153 } |
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154 |
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155 TPtrC8 CRandomServer::GetRandom(void) |
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156 { |
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157 TPtr8 res(&iPool[iPoolOut],iHash->HashSize(),iHash->HashSize()); |
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158 iPoolOut+=iHash->HashSize(); |
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159 if ((iPoolOut+iHash->HashSize())>KRandomPoolSize) |
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160 { |
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161 iPoolOut=0; |
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162 } |
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163 return iHash->Hash(res); |
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164 } |
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165 |
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166 CMessageDigest* CRandomServer::Hash(void) const |
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167 { |
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168 return iHash; |
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169 } |
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170 |
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171 void CRandomServer::Stir(void) |
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172 { |
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173 TInt rnd; |
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174 rnd=Math::Random(); |
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175 TPtrC8 r((TUint8*)&rnd,sizeof(TInt)); |
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176 iHash->Hash(r); |
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177 TPtr8 dest(&iPool[iPoolIn],iHash->HashSize()); |
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178 dest.Copy(iHash->Hash(dest)); |
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179 iPoolIn+=iHash->HashSize(); |
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180 if ((iPoolIn+iHash->HashSize())>KRandomPoolSize) |
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181 { |
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182 iPoolIn=0; |
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183 } |
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184 } |
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185 |
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186 CRandomSession* CRandomSession::NewL(CRandomServer* aServer) |
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187 { |
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188 CRandomSession* self; |
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189 self=new (ELeave) CRandomSession(aServer); |
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190 return self; |
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191 } |
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192 |
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193 CRandomSession::CRandomSession(CRandomServer* aServer) : CSession2(), iServer(aServer) |
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194 { |
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195 } |
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196 |
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197 CRandomSession::~CRandomSession(void) |
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198 { |
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199 } |
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200 |
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201 void CRandomSession::ServiceL(const RMessage2& aMessage) |
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202 { |
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203 switch (aMessage.Function()) |
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204 { |
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205 case KRandomRequest: |
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206 { |
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207 TInt ret = FillBuffer(aMessage); |
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208 aMessage.Complete(ret); |
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209 break; |
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210 } |
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211 default: |
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212 aMessage.Complete(KErrNotSupported); |
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213 break; |
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214 }; |
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215 } |
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216 |
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217 TInt CRandomSession::FillBuffer(const RMessage2& aMessage) |
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218 { |
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219 TInt length = aMessage.Int1(); |
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220 if (length < 0 || length > KRandomBlockSize) |
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221 return KErrArgument; |
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222 iServer->iQuality -= length; |
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223 if (iServer->iQuality<0) |
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224 { |
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225 iServer->iQuality=0; |
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226 } |
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227 if (!iServer->iFast) |
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228 { |
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229 if (iServer->iQuality<KThreshold) |
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230 { |
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231 TCallBack callback(CRandomServer::Tick,iServer); |
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232 iServer->iTicker->Cancel(); |
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233 iServer->iTicker->Start(KFastTickTimer,KFastTickTimer,callback); // **** these figures might need tweaking! |
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234 iServer->iFast=ETrue; |
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235 } |
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236 } |
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237 TBuf8<KRandomBlockSize> buf(0); |
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238 iServer->Stir(); |
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239 TInt i; |
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240 TInt hashsize=iServer->Hash()->HashSize(); |
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241 for (i=0; i+hashsize < length; i+=hashsize) |
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242 { |
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243 buf.Append(iServer->GetRandom()); |
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244 iServer->Stir(); |
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245 } |
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246 TPtrC8 ptr(iServer->GetRandom().Ptr(), length-i); |
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247 buf.Append(ptr); |
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248 |
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249 TRAPD(ret, aMessage.WriteL(0, buf)); |
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250 return ret; |
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251 } |
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252 |
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253 GLDEF_C TInt E32Main(void) |
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254 { |
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255 return RunRandomServer(NULL); |
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256 } |