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os/security/crypto/weakcrypto/source/random/random.cpp
author sl
Tue, 10 Jun 2014 14:32:02 +0200
changeset 1 260cb5ec6c19
permissions -rw-r--r--
Update contrib. 
     1 /*

     2 * Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of the License "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 * (c) 1999-2003 Symbian Ltd

    16 *

    17 */

    18 

    19 

    20 /**

    21  @file

    22 */

    23 

    24 #include <e32std.h>

    25 #include <random.h>

    26 #include <hash.h>

    27 #include <e32math.h>

    28 #include "randsvr.h"

    29 #include "randcliserv.h"

    30 

    31 _LIT(KRandomServerImg,"z:\\system\\libs\\randsvr.exe");		// DLL/EXE name

    32 _LIT(KRandomServerConnect, "Randsvr connect");

    33 _LIT(KRandomServerGet, "Randsvr get");

    34 

    35 const TUid KServerUid3={0x100066dc};

    36 

    37 extern "C" {

    38 EXPORT_C void RAND_bytes(unsigned char* buf,int bytes)

    39 	{

    40 	TPtr8 ptr(buf,bytes,bytes);

    41 	buf[0]++;

    42 	TRandom::Random(ptr);

    43 	}

    44 }

    45 

    46 EXPORT_C CRandom::CRandom(void)

    47 	{

    48 	}

    49 

    50 EXPORT_C CSystemRandom* CSystemRandom::NewL(void)

    51 	{

    52 	CSystemRandom* self = new(ELeave)CSystemRandom();

    53 	return self;

    54 	}

    55 

    56 EXPORT_C CSystemRandom* CSystemRandom::NewLC(void)

    57 	{

    58 	CSystemRandom* self = NewL();

    59 	CleanupStack::PushL(self);

    60 	return self;

    61 	}

    62 

    63 void CSystemRandom::GenerateBytesL(TDes8& aDest)

    64 	{

    65 	TRandom::RandomL(aDest);

    66 	}

    67 

    68 CSystemRandom::CSystemRandom(void)

    69 	{

    70 	}

    71 

    72 EXPORT_C void TRandom::Random(TDes8& aDestination)

    73 	{

    74 	RRandomSession rs;

    75 	TRAPD(ret,rs.ConnectL());

    76 	if (ret)

    77 		{

    78 		User::Panic(KRandomServerConnect, ret);

    79 		}

    80 	TInt err=rs.GetRandom(aDestination);

    81 	if (err)

    82 		{

    83 		User::Panic(KRandomServerGet, err);

    84 		}

    85 	rs.Close();

    86 	}

    87 

    88 EXPORT_C void TRandom::RandomL(TDes8& aDestination)

    89 	{

    90 	RRandomSession rs;

    91 	TRAPD(ret,rs.ConnectL());

    92 	User::LeaveIfError(ret);

    93 	CleanupClosePushL(rs);

    94 

    95 	TInt err=rs.GetRandom(aDestination);

    96 	User::LeaveIfError(err);

    97 

    98 	CleanupStack::PopAndDestroy(); // rs

    99 	}

   100 

   101 EXPORT_C RRandomSession::RRandomSession(void)

   102 	{

   103 	}

   104 

   105 static TInt StartServer()

   106 // Borrowed from AndrewT's server startup code.

   107 // Start the server process/thread which lives in an EPOCEXE object

   108 //

   109 	{

   110 	

   111 	const TUidType serverUid(KNullUid,KNullUid,KServerUid3);

   112 

   113 	//

   114 	// EPOC and EKA2 is easy, we just create a new server process. Simultaneous

   115 	// launching of two such processes should be detected when the second one

   116 	// attempts to create the server object, failing with KErrAlreadyExists.

   117 	//

   118 	RProcess server;

   119 	TInt r=server.Create(KRandomServerImg, KNullDesC, serverUid);

   120 

   121 	if (r!=KErrNone)

   122 		return r;

   123 	TRequestStatus stat;

   124 	server.Rendezvous(stat);

   125 	if (stat!=KRequestPending)

   126 		server.Kill(0);		// abort startup

   127 	else

   128 		server.Resume();	// logon OK - start the server

   129 	User::WaitForRequest(stat);		// wait for start or death

   130 	// we can't use the 'exit reason' if the server panicked as this

   131 	// is the panic 'reason' and may be '0' which cannot be distinguished

   132 	// from KErrNone

   133 	r=(server.ExitType()==EExitPanic) ? KErrGeneral : stat.Int();

   134 	server.Close();

   135 	return r;

   136 

   137 	}

   138 

   139 EXPORT_C void RRandomSession::ConnectL(void)

   140 	{

   141 	TInt retry=2;

   142 	for (;;)

   143 		{

   144 		TInt r=CreateSession(KRandomServerName,TVersion(0,0,0),1);

   145 		if (r!=KErrNotFound && r!=KErrServerTerminated)

   146 			   User::Leave(r);

   147 		if (--retry==0)

   148 			User::Leave(r);

   149 		r=StartServer();

   150 		if (r!=KErrNone && r!=KErrAlreadyExists)

   151 			User::Leave(r);

   152 		}

   153 	}

   154 

   155 EXPORT_C TInt RRandomSession::GetRandom(TDes8& aDestination)

   156 	{

   157 	if (aDestination.Length()<KRandomBlockSize)

   158 		{

   159 		return SendReceive(CRandomSession::KRandomRequest,

   160 		                   TIpcArgs(&aDestination, aDestination.Length()));

   161 		}

   162 	else

   163 		{

   164 		TInt i;

   165 		TInt err=KErrNone;

   166 		TInt length=aDestination.Length();

   167 		for (i=0;(i+KRandomBlockSize)<length;i+=KRandomBlockSize)

   168 			{

   169 			TPtr8 buffer(&aDestination[i],KRandomBlockSize,KRandomBlockSize);

   170 			err=SendReceive(CRandomSession::KRandomRequest,

   171 			 				TIpcArgs(&buffer, KRandomBlockSize));

   172 			if (err)

   173 				{

   174 				return err;

   175 				}

   176 			}

   177 		TPtr8 buffer(&aDestination[i],length%KRandomBlockSize,KRandomBlockSize);

   178 		err=SendReceive(CRandomSession::KRandomRequest,

   179 						TIpcArgs(&buffer, length-i));

   180 		return err;

   181 		}

   182 	}

   183
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