author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 14 Sep 2010 23:56:21 +0300 | |
branch | RCL_3 |
changeset 45 | 9e2d4f7f5028 |
parent 19 | 4a8fed1c0ef6 |
permissions | -rw-r--r-- |
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// Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// eka\kernel\securerng.cpp |
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// |
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// |
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|
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#include "kernel/securerng.h" |
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#include "sha256.h" |
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|
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/** |
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* Default Constructor. |
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* Initialize the Secure RNG with values for iInternalStateV, iInternalStateC, Reseed_Counter |
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* Entropy Pool threshold and Secure RNG status |
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*/ |
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DSecureRNG::DSecureRNG() : |
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iSha256(), |
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iEntropyPool(), |
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iReseedCounter(0), |
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iEntropyEstimation(0), |
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iSecureRNGIdle(EFalse), |
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iRNGSecure(EFalse), |
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iEntropyThreshold(KInstantiationThreshold) |
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{ |
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// Create the Mutex objects before initializing the internal state. |
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_LIT(KRNGMutexName,"SecureRNGMutex"); |
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_LIT(KEntropyMutexName,"EntropyMutex"); |
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NKern::ThreadEnterCS(); |
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__ASSERT_ALWAYS(Kern::MutexCreate(iSecureRNGMutex, KRNGMutexName, KMutexOrdRandNumGeneration) == KErrNone, |
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K::Fault(K::ESecureRNGInitializationFailed)); |
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__ASSERT_ALWAYS(Kern::MutexCreate(iEntropyMutex, KEntropyMutexName, KMutexOrdEntropyPool) == KErrNone, |
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K::Fault(K::ESecureRNGInitializationFailed)); |
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NKern::ThreadLeaveCS(); |
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// Initially feed the internal state with the current system time tick |
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TUint64 tick = Kern::SystemTimeSecure(); |
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TBuf8<sizeof(TUint64)> entropyInput; |
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entropyInput.Copy((TUint8*)(&tick), sizeof(TUint64)); |
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// Initialize the system internal state with the time tick as entropy input. |
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Reseed(entropyInput); |
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} |
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|
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/** |
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* Random Number Generation Algorithm: |
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* 1.If reseed_counter > reseed_interval, then return an indication that a reseed is required. |
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* 2.(returned_bits) = Hashgen (requested_number_of_bits, V). |
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* 3. H = Hash (0x03 || V). Where 0x03 is represented in one byte |
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* 4. V = (V + H + C + reseed_counter) mod 2 ^seedlen. |
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* 5. reseed_counter = reseed_counter + 1. |
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* 6. Return SUCCESS, and update the new values of V, C, and reseed_counter |
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* for the new_working_state. |
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* @param aRandomValue on return will contain the generated random numbers.The length of random number |
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* generated will be equal to the current length of the descriptor(aRandomValue) |
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* passed as argument to the function call |
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@panic Panics the kernel with KErrNotReady when the number of requests that can be served has crossed it maximum limit |
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of KReseedInterval. The panic will indicate that something has badly gone wrong with the Entropy accumulation and |
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Reseed unit. |
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* @return KErrNone if everything is fine or KErrNotReady when the system is not ready yet. |
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*/ |
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TInt DSecureRNG::GenerateRandomNumber(TDes8& aRandomValue) |
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{ |
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// If requested for random numbers greater than the max limit specified by HASH_DRBG (2^19 bits = 65536 bytes), return error |
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if(aRandomValue.Length() > KMaxNoOfRequestedBytes) |
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{ |
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return KErrArgument; |
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} |
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|
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// Secure the random number generation operation through mutex |
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NKern::ThreadEnterCS(); |
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Kern::MutexWait(*iSecureRNGMutex); |
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if(iReseedCounter >= KReseedInterval && iRNGSecure) |
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{ |
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// If we got reseeded before but haven't been reseeded inside the interval, then something must |
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// have happened to the entropy collection mechanism (the interval is quite large) - possibly we |
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// are under attack. There is no way to return to a secure state, so fault the system. |
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K::Fault(K::ESecureRNGInternalStateNotSecure); |
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} |
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iSecureRNGIdle = EFalse; |
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// Generate the random numbers |
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HashGen(aRandomValue); |
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const TUint8 KRngConstant = 0x03; |
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iSha256.Update((TUint8*)&KRngConstant, sizeof(TUint8)); |
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iSha256.Update(iInternalStateV , KSeedLength); |
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98 |
// Update the secret value of the Internal State V so that back tracking can be avoided. |
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99 |
// V = (V+C+H+reseed_counter) mod 2 ^seedlength |
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100 |
AddBigNumberToInternalStateV(iInternalStateC, KSeedLength); |
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101 |
AddBigNumberToInternalStateV(iSha256.Final().Ptr(),KSHA256OutLengthInBytes ); |
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102 |
|
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103 |
// Converts iReseedCounter value from little endian to big endian format and stores in tempcounter. |
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104 |
TUint32 tempCounter = ConvertToBigEndian(iReseedCounter); |
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105 |
AddBigNumberToInternalStateV((TUint8*)&tempCounter,sizeof(tempCounter)); |
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106 |
|
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107 |
++iReseedCounter; |
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108 |
TBool rngSecure = iRNGSecure; |
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109 |
Kern::MutexSignal(*iSecureRNGMutex); |
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110 |
NKern::ThreadLeaveCS(); |
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111 |
|
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112 |
if(rngSecure) |
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113 |
{ |
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114 |
return KErrNone; |
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115 |
} |
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116 |
return KErrNotReady; |
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117 |
} |
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118 |
|
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119 |
/** |
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120 |
* Converts the aTempCounter from little endian format to big endian format. This conversion is required |
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121 |
* for performing addition in the function AddBigNumbers(). |
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* Works fine for 32 bits data only. |
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* @ return TUint32, big endian format 32 bit value of the iReseedCounter |
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124 |
*/ |
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125 |
inline TUint32 DSecureRNG::ConvertToBigEndian(TUint32 aTempCounter) |
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126 |
{ |
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127 |
return ((aTempCounter >> 24 & 0x000000ff)| (aTempCounter<< 8 & 0x00ff0000) |
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128 |
|(aTempCounter>>8 & 0x0000ff00) | (aTempCounter << 24 &0xff000000)); |
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129 |
} |
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130 |
|
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131 |
/** |
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132 |
* This function performs addition of an integer(aInteger) passed to the function with iInternalStateV and |
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133 |
* the result is stored in iInternalStateV. The function is required to update the internal state of |
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134 |
* V(iInternalStateV) after each random number generation request. |
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135 |
* @param aInteger this is the input paramenter which is added with iInternalStateV and the result |
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136 |
* is stored in iInternalStateV |
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137 |
* @param aLength length of the aInteger( integer that needs to be added to iInternalStateV) passed to the function |
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138 |
*/ |
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139 |
void DSecureRNG::AddBigNumberToInternalStateV(const TUint8* aInteger, TInt aLength) |
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140 |
{ |
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141 |
TUint8 sum[2]= {0}; |
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142 |
TInt index = KSeedLength; |
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143 |
while(--index >= 0 && (--aLength >= 0 || sum[1] == 1)) |
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144 |
{ |
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145 |
TUint8 integer = (aLength >= 0) ? aInteger[aLength] : (TUint8)0 ; |
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146 |
// sum[0]will hold the value of addition operation and sum[1] will hold carry (if any) |
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147 |
*(TUint16*)&sum = TUint16(iInternalStateV[index] + integer + sum[1]); |
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148 |
iInternalStateV[index] = sum[0]; |
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149 |
} |
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150 |
} |
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151 |
|
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152 |
/** |
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153 |
*Generate the next random number bits to be returned. |
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154 |
* HashGen Algorith: |
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155 |
* 1. m = requested_number_of_bits/ KSHA256OutLengthInBytes. |
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|
156 |
* 2. data = V. |
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|
157 |
* 3. W = the Null string. |
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|
158 |
* 4. For i = 1 to m |
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159 |
* 4.1 wi = Hash (data). |
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|
160 |
* 4.2 W = W || wi. |
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|
161 |
* 4.3 data = (data + 1) mod 2^seedlen. |
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|
162 |
* 5. returned_bits = Leftmost (requested_no_of_bits) bits of W. |
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|
163 |
* |
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|
164 |
* Continuous Random number generation test: This is FIPS recommended (FIPS 140-2)test. Definition as per FIPS:- |
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|
165 |
* 1. If each call to a RNG produces blocks of n bits (where n > 15), the first n-bit block generated |
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|
166 |
* after power-up, initialization, or reset shall not be used, but shall be saved for comparison with |
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|
167 |
* the next n-bit block to be generated. Each subsequent generation of an n-bit block shall be compared |
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|
168 |
* with the previously generated block. The test shall fail if any two compared n-bit blocks are equal. |
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|
169 |
* 2. If each call to a RNG produces fewer than 16 bits, the first n bits generated after power-up, |
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|
170 |
* initialization, or reset (for some n > 15) shall not be used, but shall be saved for comparison |
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|
171 |
* with the next n generated bits. Each subsequent generation of n bits shall be compared with the |
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|
172 |
* previously generated n bits. The test fails if any two compared n-bit sequences are equal. |
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|
173 |
* |
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|
174 |
* @param aRandomBuffer on return, the descriptor will contain the generated random bytes. |
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175 |
* |
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176 |
*/ |
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|
177 |
void DSecureRNG::HashGen(TDes8& aRandomBuffer) |
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178 |
{ |
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179 |
TBuf8<KSeedLength> data; |
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180 |
// data = V(iInternalStateV) |
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181 |
data.Copy(iInternalStateV, KSeedLength); |
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182 |
|
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183 |
TInt noOfBytesToCopy = aRandomBuffer.Length(); |
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|
184 |
TInt newLength = noOfBytesToCopy; |
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|
185 |
//set the length to zero |
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|
186 |
aRandomBuffer.Zero(); |
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187 |
while(noOfBytesToCopy > 0) |
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188 |
{ |
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|
189 |
newLength = noOfBytesToCopy > KSHA256OutLengthInBytes ? KSHA256OutLengthInBytes: noOfBytesToCopy; |
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|
190 |
// Append Hashed Data to buffer |
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|
191 |
aRandomBuffer.Append(HashDataAndCompare(data), newLength); |
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|
192 |
IncrementData(data); |
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193 |
noOfBytesToCopy = noOfBytesToCopy - KSHA256OutLengthInBytes; |
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194 |
} |
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} |
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|
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/* |
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* Generates Hash of the aData and compares it with previous generated n(256) random bits to verify for |
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* Continuous Random number generation test. |
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* @param aData, the latest copy of iInternalStateV value to be used hash operation |
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* @return ptr, pointer to the generated hash value using sha256 |
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*/ |
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inline const TUint8* DSecureRNG::HashDataAndCompare(TDes8& aData) |
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{ |
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iSha256.Update(aData.Ptr(), aData.Length()); |
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const TDesC8& ptr = iSha256.Final(); |
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if(iCompareBuffer.Length()!= 0) |
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{ |
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// According to FIPS 140-2: if the n-bit random number is same as the previously generated |
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// n-bit random number then fault the system |
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__ASSERT_ALWAYS(iCompareBuffer.Compare(ptr)!= 0,K::Fault(K::ESecureRNGOutputsInBadState)); |
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} |
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iCompareBuffer.Copy(ptr); |
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return ptr.Ptr(); |
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} |
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|
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/** |
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* Calculates (data+1) modulus of 2^440. |
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* @return aData, on return contains aData value incremented by one |
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*/ |
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inline void DSecureRNG::IncrementData(TDes8& aData) |
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{ |
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TInt i = KSeedLength-1; |
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aData[i] += 1; |
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while( i > 0 && aData[i] == 0) |
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{ |
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aData[--i] +=1; |
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} |
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} |
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|
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/** |
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* The hash-based derivation function hashes the given input string and |
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* returns the required no. of bits of hash value on the second parameter. |
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* Algorithm: |
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* 1. temp = the Null string. |
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* 2. len = no_of_bits_to_return / out_len. |
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* 3. counter = an 8-bit binary value representing the integer "1". |
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* 4. For i = 1 to len do //Comment : In step 4.1, no_of_bits_to_return is used as a 32-bit string. |
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* 4.1 temp = temp || Hash (counter || no_of_bits_to_return || input_string). |
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* 4.2 counter = counter + 1. |
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* 5. requested_bits = Leftmost (no_of_bits_to_return) of temp. |
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* 6. Return SUCCESS and requested_bits. |
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* |
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* In our case, the no_of_bits_to_return and out_len are constants 440, 256 respectively |
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* and hence the KLoopLength too becomes constant 2. |
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* @param, aInputData, holds the input data(state) which needs to be updated |
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* @param aOutputData, on return will have the updated value of internal State |
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*/ |
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void DSecureRNG::HashDf(const TDesC8& aInputData, TUint8* aOutputData) |
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{ |
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// Seed Length is 440 and SHA256 output block length 256. So required iterations is 2 for 440 bits |
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const TUint8 KLoopLength = 2; |
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const TUint32 KNumOfBitsToReturn = KSeedLength * 8; |
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TInt length = KSHA256OutLengthInBytes; |
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// Note: The 'length' in memcpy works fine only for curent seed length (440 bits => two iterations) |
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// In future, if the seed length changes, this too should be modified accoringly. |
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for (TUint8 counter = 1; counter<= KLoopLength; ++counter) |
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{ |
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iSha256.Update(&counter, sizeof(TUint8)); |
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iSha256.Update((TUint8*)&KNumOfBitsToReturn, sizeof(TUint32)); |
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iSha256.Update(aInputData.Ptr(), aInputData.Length()); |
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memmove((aOutputData + (counter-1) * KSHA256OutLengthInBytes), iSha256.Final().Ptr(), length); |
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length = KSeedLength - KSHA256OutLengthInBytes; |
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} |
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} |
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|
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/** |
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* This method would generate the new seed with the entropy passed in and update the internal state |
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* based on the new seed generated. Seed Generation should happen in the following two cases. |
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* Instantiattion: Internal state updation for the first time with sufficient entropy. |
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* 1. construct the seed material : seed_material = entropy_input |
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* 2. seed = Hash_df (seed_material, seedlen). |
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* 3. V = seed. |
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* 4. C = Hash_df ((0x00 || V), seedlen). // Precede with a byte of all zeros. |
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* 5. reseed_counter = 0. |
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* |
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* Reseeding: Internal state updation with the sufficient entropy for all instances except first time. |
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* 1. construct the seed material : seed_material = 0x01 || V || entropy_input |
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* 2. seed = Hash_df (seed_material, seedlen). |
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* 3. V = seed. |
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* 4. C = Hash_df ((0x00 || V), seedlen). // Precede with a byte of all zeros. |
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* 5. reseed_counter = 0. |
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* |
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* In both the cases only the step 1 differs. All other steps are common for both. |
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* The internal state and other relevant members are protected by the mutex. |
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* @param aEntropyInput, holds the entropy input values required to update the internal states |
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*/ |
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void DSecureRNG::Reseed(const TDesC8& aEntropyInput) |
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{ |
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const TUint8 KConstOne = 0x01; |
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TBuf8<KMaxSeedMaterialLength> seedMaterial; |
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292 |
|
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293 |
// Construct the seed material. |
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294 |
if(iRNGSecure) |
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295 |
{ |
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|
296 |
// After the first seeding (which will set iRNGSecure), seed_material = 0x01 || V || entropy_input |
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|
297 |
seedMaterial.Append(&KConstOne, sizeof(TUint8)); |
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|
298 |
seedMaterial.Append(iInternalStateV, KSeedLength); |
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|
299 |
|
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|
300 |
// Make the system idle on every reseed (will be reset next time the RNG is used) |
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|
301 |
iSecureRNGIdle = ETrue; |
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|
302 |
} |
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|
303 |
|
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Revision: 201007
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|
304 |
// The enropy input is used whether it's the first seeding or not. |
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Revision: 201007
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|
305 |
seedMaterial.Append(aEntropyInput); |
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|
306 |
|
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|
307 |
// On the first seeding, include the personalizsation string for the instantiation. |
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Revision: 201007
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|
308 |
if(!iRNGSecure) |
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|
309 |
{ |
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|
310 |
// System time in ticks is considered as a personalization string |
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Revision: 201007
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|
311 |
TInt64 personalizationString = Kern::SystemTimeSecure(); |
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Revision: 201007
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|
312 |
seedMaterial.Append((TUint8*)&personalizationString, sizeof(TUint)); |
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|
313 |
} |
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|
314 |
|
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315 |
// Calculate the seed and update the internal state V |
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|
316 |
HashDf(seedMaterial, iInternalStateV); |
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|
317 |
|
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|
318 |
// Calculate and update the internal state C |
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Revision: 201007
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|
319 |
seedMaterial.FillZ(1); // Put the 0x00 in the first byte of the buffer |
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Revision: 201007
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|
320 |
seedMaterial.Append(iInternalStateV, KSeedLength); |
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Revision: 201007
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parents:
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|
321 |
HashDf(seedMaterial, iInternalStateC); |
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Revision: 201007
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parents:
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|
322 |
|
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Revision: 201007
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|
323 |
// Reset the reseed counter and other related parameter values as well. |
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Revision: 201007
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|
324 |
iReseedCounter = 0; |
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Revision: 201007
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|
325 |
iEntropyPool.Reset(); |
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Revision: 201007
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|
326 |
// Reset the current estimation. |
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Revision: 201007
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|
327 |
iEntropyEstimation = 0; |
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Revision: 201007
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|
328 |
} |
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|
329 |
|
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Revision: 201007
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|
330 |
/** |
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Revision: 201007
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|
331 |
* Controls the Reseed process with the following algorithm. |
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Revision: 201007
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|
332 |
* 1. Collect the received entropy in the entropy pool like hash object. |
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Revision: 201007
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parents:
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|
333 |
* 2. Increment the entropy estimation counter by the received estimation value. |
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Revision: 201007
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parents:
diff
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|
334 |
* 3. If the so far collected estimation is higher than the threshold value, |
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Revision: 201007
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parents:
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|
335 |
* 3.1. Call Reseed to generate the new seed and update the system internal state |
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Revision: 201007
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|
336 |
* 3.2. Decide the secure status of the new seed and hence the RNG system |
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|
337 |
* 3.3. Decide whether the system is idle or not |
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Revision: 201007
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|
338 |
* 3.4. Reset the entropy pool hash object and the entropy estimation counter. |
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Revision: 201007
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parents:
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|
339 |
* |
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Revision: 201007
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|
340 |
*/ |
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Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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|
341 |
void DSecureRNG::AddEntropy(const TUint8* aEntropy, TInt aLength, TInt aEstimation) |
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|
342 |
{ |
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Revision: 201007
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|
343 |
// Get the mutex to update the entropy pool |
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Revision: 201007
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|
344 |
NKern::ThreadEnterCS(); |
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Revision: 201007
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|
345 |
Kern::MutexWait(*iEntropyMutex); |
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Revision: 201007
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|
346 |
|
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Revision: 201007
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parents:
diff
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|
347 |
iEntropyPool.Update(aEntropy, aLength); |
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Revision: 201007
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parents:
diff
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|
348 |
iEntropyEstimation += aEstimation; |
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Revision: 201007
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parents:
diff
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|
349 |
|
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Revision: 201007
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parents:
diff
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|
350 |
if (iEntropyEstimation >= iEntropyThreshold) |
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Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
351 |
{ |
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Revision: 201007
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parents:
diff
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|
352 |
// Get the mutex to update the internal state via Reseed. |
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Revision: 201007
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parents:
diff
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|
353 |
Kern::MutexWait(*iSecureRNGMutex); |
4a8fed1c0ef6
Revision: 201007
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parents:
diff
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|
354 |
|
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
355 |
// Get the final hash value and pass on to the reseed, which inturn will update the internal state. |
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Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
356 |
Reseed(iEntropyPool.Final()); |
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Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
357 |
|
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
358 |
// Set the threshold to 256 for all but the first reseed. For instantiation |
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Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
359 |
// the threshold should be 384 which was set already as part of initialization. |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
360 |
iEntropyThreshold = KReseedThreshold; |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
361 |
|
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
362 |
// As the entropy estimation has crossed the threshold, the system becomes secure. |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
363 |
iRNGSecure = ETrue; |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
364 |
|
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
365 |
// Send the reseed notification to the hook, if one is installed |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
366 |
if (iReseedHookFn) |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
367 |
iReseedHookFn(iReseedHookArg); |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
368 |
|
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
369 |
// Updates are done. So, release the Mutex. |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
370 |
Kern::MutexSignal(*iSecureRNGMutex); |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
371 |
} |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
372 |
|
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
373 |
// Updates are done. So, release the Mutex. |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
374 |
Kern::MutexSignal(*iEntropyMutex); |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
375 |
NKern::ThreadLeaveCS(); |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
376 |
} |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
377 |
|
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
378 |
// Allow a test driver to set a hook function which will be called on reseed. |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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|
379 |
void DSecureRNG::SetReseedHook(void (*aReseedHookFn)(TAny*), TAny* aReseedHookArg) |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
380 |
{ |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
381 |
NKern::ThreadEnterCS(); |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
382 |
Kern::MutexWait(*iSecureRNGMutex); |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
383 |
iReseedHookFn = aReseedHookFn; |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
384 |
iReseedHookArg = aReseedHookArg; |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
385 |
Kern::MutexSignal(*iSecureRNGMutex); |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
386 |
NKern::ThreadLeaveCS(); |
4a8fed1c0ef6
Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
387 |
} |