author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 04 Oct 2010 02:35:35 +0300 | |
changeset 281 | 13fbfa31d2ba |
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permissions | -rw-r--r-- |
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// Copyright (c) 1994-2010 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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// e32\kernel\random.cpp |
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// |
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// |
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#include <kernel/kern_priv.h> |
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#include "securerng.h" |
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#include "execs.h" |
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// The global pointer to the RNG instance |
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DSecureRNG* SecureRNG; |
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/** |
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Gets 32 random bits from the kernel's random number generator. |
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The returned random data may or may not be cryptographically secure but should be of a high quality for |
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non-cryptographic purposes. |
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This function uses a cryptographically strong random number generator to generate the random data, which can |
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be slower than insecure generators. If security is not important, you may wish to use a trivial RNG instead |
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for performance. |
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@return The 32 random bits. |
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@pre Kernel Lock must not be held. |
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@pre No fast mutex should be held |
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@pre Interrupts should be enabled |
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@pre Can be used in a device driver. |
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*/ |
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EXPORT_C TUint32 Kern::Random() |
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CHECK_PRECONDITIONS(MASK_THREAD_STANDARD, "Kern::Random()"); |
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TBuf8<4> randomBuffer; |
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randomBuffer.SetMax(); |
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SecureRNG->GenerateRandomNumber(randomBuffer); |
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return *((const TUint32*)randomBuffer.Ptr()); |
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} |
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/** |
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Fills the provided descriptor with random data up to its current length. The number of random bytes required |
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should be specified by setting the length of the descriptor that is passed to the function. |
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If the returned random data cannot be guaranteed to be cryptographically secure, the function will return |
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KErrNotReady, but data will still be provided suitable for non-cryptographic purposes. |
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The security strength of the cryptograpically strong random number generator is 256 bits. |
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@param aRandomValue on return, the descriptor is filled with the requested number of random bytes. |
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@return KErrArgument if more than 65536 bytes are requested in a single call. |
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KErrNotReady if the returned random data cannot be guaranteed to be cryptographically secure. |
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KErrNone if the returned random data is believed to be cryptographically secure. |
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@pre Kernel Lock must not be held |
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@pre No fast mutex should be held |
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@pre Interrupts should be enabled |
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@pre Can be used in a device driver. |
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*/ |
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EXPORT_C TInt Kern::SecureRandom(TDes8& aRandomValue) |
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{ |
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CHECK_PRECONDITIONS(MASK_THREAD_STANDARD, "Kern::SecureRandom(TDes8&)"); |
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return SecureRNG->GenerateRandomNumber(aRandomValue); |
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} |
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/** |
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Adds the given entropy input to the entropy pool used for random number generation. |
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This is the only version of Kern::RandomSalt which allows entropy samples larger than 8 bytes to be added. |
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Entropy estimates should be chosen carefully to reflect the minimum entropy that the sample may contain. |
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@param aEntropyData Pointer to the entropy data. |
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@param aEntropyDataLength Length of the entropy data in bytes. |
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@param aBitsOfEntropy The amount of entropy (in bits) present in the entropy data. |
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@pre Kernel Lock must not be held |
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@pre No fast mutex should be held |
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@pre Interrupts should be enabled |
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@pre Can be used in a device driver. |
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*/ |
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EXPORT_C void Kern::RandomSalt(const TUint8* aEntropyData, TUint aEntropyDataLength, TUint aBitsOfEntropy) |
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CHECK_PRECONDITIONS(MASK_THREAD_STANDARD, "Kern::RandomSalt(const TUint8*, TUint, TUint)"); |
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// Check if the claimed entropy estimation (in bits) is not more than the maximum value. |
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__ASSERT_ALWAYS(aBitsOfEntropy <= aEntropyDataLength*8, K::PanicKernExec(EEntropyEstimateOutOfRange)); |
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// If the Secure RNG system is not in idle mode, add the collected entropy to the entropy pool. |
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if (!SecureRNG->SecureRNGIdle()) |
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SecureRNG->AddEntropy(aEntropyData, aEntropyDataLength, aBitsOfEntropy); |
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} |
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} |
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/* |
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* Exec handler function for obtaining secure random numbers |
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*/ |
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TInt ExecHandler::MathSecureRandom(TDes8& aRandomValue) |
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{ |
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TInt randomValueLength = 0; |
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TInt randomValueMaxLength = 0; |
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//Gets information about the user specified descriptor. |
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TUint8* kernelPtr = (TUint8*)Kern::KUDesInfo(aRandomValue, randomValueLength, randomValueMaxLength); |
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if(randomValueMaxLength == -1) //user passed descriptor is not writable |
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{ |
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K::PanicKernExec(EKUDesSetLengthInvalidType); |
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} |
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// The random number generator requires a temporary buffer to write the data to, before we write it back to |
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// userspace's buffer. The buffer is allocated here on the stack to avoid having to heap-allocate, and if |
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// the requested amount of data is larger, a loop is used. 1024 bytes will always fit onto the stack in an |
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// exec handler. |
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const TInt KRandomBufferSize = 1024; |
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TBuf8<KRandomBufferSize> randomBuffer; |
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|
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TInt err = KErrNone; |
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TBool isKErrNotReadyTrue = EFalse; |
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while(randomValueLength > 0) |
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{ |
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TInt noOfBytesToGenerate = (randomValueLength > KRandomBufferSize) ? KRandomBufferSize : randomValueLength; |
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randomBuffer.SetLength(noOfBytesToGenerate); |
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// Generate random numbers |
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err = Kern::SecureRandom(randomBuffer); |
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if(err == KErrNotReady) |
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{ |
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isKErrNotReadyTrue = ETrue; |
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} |
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else if (err != KErrNone) |
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{ |
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return err; // any other system wide error code needs to be returned immediately. |
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} |
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// Copy the generated random numbers to the user descriptor. |
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umemput(kernelPtr, randomBuffer.Ptr(), noOfBytesToGenerate); |
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kernelPtr += KRandomBufferSize; |
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randomValueLength -= KRandomBufferSize; |
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} |
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|
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// Atleast one KErrNotReady error was generated during processing the request, so return the state as not ready |
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// indicating the internal states was not secure during random number generation. |
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if(isKErrNotReadyTrue) |
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{ |
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return KErrNotReady; |
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} |
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return err; |
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} |