rtp/srtpstack/src/srtpaesctrcrypto.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:03:15 +0200
changeset 0 307788aac0a8
child 2 1e1cc61f56c3
permissions -rw-r--r--
Revision: 201003 Kit: 201005
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/*
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* Copyright (c) 2005 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 "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:    Class for AES (in Counter Mode) encryption operations
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*
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*/
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#include "srtpaesctrcrypto.h"
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#include <e32uid.h>
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#include <symmetric.h>
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#include "srtpdef.h"
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#include "srtputils.h"
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// ---------------------------------------------------------------------------
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// CSrtpAESCTRCrypto::NewL()
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// 
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// ---------------------------------------------------------------------------
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//
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EXPORT_C CSrtpAESCTRCrypto* CSrtpAESCTRCrypto::NewL()
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	{
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	CSrtpAESCTRCrypto* self=new (ELeave) CSrtpAESCTRCrypto( );
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	return self;
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	}
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// ---------------------------------------------------------------------------
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// CSrtpAESCTRCrypto::~CSrtpAESCTRCrypto()
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// 
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// ---------------------------------------------------------------------------
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//
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CSrtpAESCTRCrypto::~CSrtpAESCTRCrypto()
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	{
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	}
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// ---------------------------------------------------------------------------
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// CSrtpAESCTRCrypto::CSrtpAESCTRCrypto
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// 
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// ---------------------------------------------------------------------------
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//
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CSrtpAESCTRCrypto::CSrtpAESCTRCrypto( ) 
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	{
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	}
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// ---------------------------------------------------------------------------
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// CSrtpAESCTRCrypto::KeystreamL
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// 
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// ---------------------------------------------------------------------------
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//
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EXPORT_C HBufC8* CSrtpAESCTRCrypto::KeystreamL(TUint aBitLength, 
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                                                const TDesC8& aKey, 
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                                                const TDesC8& aIV )
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	{
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    TBuf8<16> iv;           //temp for IV    
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    TBuf8<16> data;         //for a 128-bit piece of a keystream    
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    CAESEncryptor*  encryptor = NULL;
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    TUint buffLength;       //length of the result (as 8 bit descriptor)
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    TUint count;          // how many 128-bit AES calls needed 
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    buffLength = aBitLength/8;  
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    if (aBitLength%8)
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        {
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        buffLength++;            
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        }
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    count = aBitLength/128;    
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    if (aBitLength%128)
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        {
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        count++;            
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        }
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	HBufC8* outputBuff = HBufC8::NewLC(16*count);
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	TPtr8 ptrOutputBuff = outputBuff->Des();	
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    SRTP_DEBUG_TUINT_VALUE( "KeyStreamL, Check the length of aKey==16 and the length is", (aKey.Length()) );
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    if(aKey.Length() != 16)
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    	{
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	    CleanupStack::Pop(outputBuff);
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        delete outputBuff;    
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        outputBuff=NULL;    
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    	User::Leave(KErrArgument);
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    	}
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    SRTP_DEBUG_TUINT_VALUE( "KeyStreamL, Check the length of aIV==16 and the length is", (TUint)aIV.Length() );
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    //if IV's length is not valid
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    if(aIV.Length() != 16)
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    	{
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	    CleanupStack::Pop(outputBuff);
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        delete outputBuff;    
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        outputBuff= NULL; 
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    	User::Leave(KErrArgument);
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    	}    
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    iv.Copy(aIV);
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    SRTP_DEBUG_TUINT_VALUE( "KeyStreamL, Check aBitLength/128>KSRTPMaxKeyStreamBlocks and the length is", 
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                (TUint)aBitLength/128  );
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    if(aBitLength/128 > KSRTPMaxKeyStreamBlocks)
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parents:
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   113
    	{
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parents:
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   114
	    CleanupStack::Pop(outputBuff);
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parents:
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   115
        delete outputBuff;    
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parents:
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   116
        outputBuff=NULL;   
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parents:
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   117
    	User::Leave(KErrArgument);
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   118
    	}
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parents:
diff changeset
   119
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   120
    encryptor = CAESEncryptor::NewLC(aKey);
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parents:
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   121
                   
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   122
    for(int x = 0; x < count; x++)
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   123
    	{    	    	   	
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   124
    	data.Copy(iv);
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parents:
diff changeset
   125
    
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   126
    	encryptor->Transform(data);
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parents:
diff changeset
   127
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   128
    	IncreaseIV(iv);
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   129
    	    			
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   130
		ptrOutputBuff.Append(data);		    	
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   131
    	}
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parents:
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   132
    
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   133
    //set the size if it was changed
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parents:
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   134
    TInt size= ptrOutputBuff.Size();
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   135
    ptrOutputBuff.SetLength(buffLength);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   136
    	
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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   137
	CleanupStack::PopAndDestroy(encryptor);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   138
    CleanupStack::Pop(outputBuff); 
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   139
       	    
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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   140
    SRTP_DEBUG_TUINT_VALUE( "CSrtpAESCTRCrypto::KeystreamL ptrOutputBuff.Size()", 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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   141
    			(TUint)size );
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parents:
diff changeset
   142
    
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   143
    return outputBuff;	
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parents:
diff changeset
   144
	}
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   145
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parents:
diff changeset
   146
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   147
// ---------------------------------------------------------------------------
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   148
// CSrtpAESCTRCrypto::EncryptL
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   149
// 
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   150
// ---------------------------------------------------------------------------
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   151
//
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   152
EXPORT_C HBufC8* CSrtpAESCTRCrypto::EncryptL(const TDesC8& aKey, 
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   153
                                            const TDesC8& aIV, 
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parents:
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   154
                                            const TDesC8& aSrc)
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parents:
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   155
	{
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parents:
diff changeset
   156
		
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parents:
diff changeset
   157
		HBufC8* outputBuff = HBufC8::NewLC(aSrc.Length());
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parents:
diff changeset
   158
		TPtr8 ptrOutputBuff = outputBuff->Des();
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parents:
diff changeset
   159
			
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parents:
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   160
	    TBuf8<16> iv; //temp for IV
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parents:
diff changeset
   161
	    TBuf8<16> data; //for a 128-bit piece of a keystream
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parents:
diff changeset
   162
	    TBuf8<16> msg; //for a 128-bit piece of a message
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parents:
diff changeset
   163
	    TInt count=0; // how many full 128-bit pieces can be made of a source
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parents:
diff changeset
   164
	    
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parents:
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   165
	    CAESEncryptor* encryptor = NULL;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   166
	    SRTP_DEBUG_TINT_VALUE( "EncryptL, Check aBitLengh ==16 and the length is", 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   167
	                aKey.Length()  );
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   168
	      
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parents:
diff changeset
   169
	    //if key's length is not valid
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   170
	    if(aKey.Length() != 16)
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parents:
diff changeset
   171
	    	{
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parents:
diff changeset
   172
		    CleanupStack::Pop(outputBuff);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   173
	        delete outputBuff;    
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   174
	        outputBuff= NULL;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   175
	    	User::Leave(KErrArgument);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   176
	    	}
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   177
	    SRTP_DEBUG_TINT_VALUE( "EncryptL, Check the length of aIV==16 and the length is", 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   178
	                aIV.Length() );
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parents:
diff changeset
   179
	               
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parents:
diff changeset
   180
	    //if IV's length is not valid
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   181
	    if(aIV.Length() != 16)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   182
	    	{
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   183
		    CleanupStack::Pop(outputBuff);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   184
	        delete outputBuff;    
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   185
	        outputBuff= NULL;  
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   186
	    	User::Leave(KErrArgument);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   187
	    	}    
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   188
		
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   189
		SRTP_DEBUG_TINT_VALUE("EncryptL, Check aSrc.Length()>KSRTPMaxTextLength and the length is", 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   190
	                aSrc.Length()  );
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   191
	          
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   192
	    //check that text length is less than 2^23
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   193
	    if(aSrc.Length() > KSRTPMaxTextLength)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   194
	    	{
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   195
		    CleanupStack::Pop(outputBuff);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   196
	        delete outputBuff;    
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   197
	        outputBuff= NULL;    
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   198
	    	User::Leave(KErrArgument);
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parents:
diff changeset
   199
	    	}
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parents:
diff changeset
   200
	            
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parents:
diff changeset
   201
	    iv.Copy(aIV);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   202
	        
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   203
	    count = aSrc.Length()/16;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   204
		
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   205
		SRTP_DEBUG_TINT_VALUE("EncryptL, count>KSRTPMaxKeyStreamBlocks and the length is", 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   206
	                count  );
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parents:
diff changeset
   207
	         
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   208
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   209
	    if(count > KSRTPMaxKeyStreamBlocks)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   210
	    	{
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   211
		    CleanupStack::Pop(outputBuff);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   212
	        delete outputBuff;    
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   213
	        outputBuff= NULL;  
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   214
	    	User::Leave(KErrArgument);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   215
	    	}
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   216
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   217
	    encryptor = CAESEncryptor::NewLC(aKey);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   218
	                   
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   219
	    for(int x = 0; x < count; x++)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   220
	    	{
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   221
	    	msg.Copy(aSrc.Mid(x*16, 16));
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   222
	    	
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   223
	    	data.Copy(iv);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   224
	    	   	
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   225
	    	encryptor->Transform(data);
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   226
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	    	IncreaseIV(iv);
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   228
	    	    	
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		    // XOR 128-bits of message with encrypted IV
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		    for(int i = 0; i < 16; i++)
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				{
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				msg[i] ^= data[i];
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				}
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   234
			
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			ptrOutputBuff.Append(msg);
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   236
			    	
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	    	}
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   238
	    
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	    //if source's length isn't an exact multiple of 128-bits
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	    if(aSrc.Length()%16)
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	    	{
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	    	TInt bytesleft;
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	    	bytesleft = aSrc.Length() - count*16;
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   244
	    	
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	    	msg.Copy(aSrc.Mid(count*16, bytesleft));
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	    	data.Copy(iv);
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	    	encryptor->Transform(data);
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   248
	    		
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		    // XOR last piece of message with encrypted IV
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		    for(int i = 0; i < bytesleft; i++)
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			{
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					msg[i] ^= data[i];
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			}
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   254
			
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			ptrOutputBuff.Append(msg);
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   256
			    		
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	    	}
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   258
		
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		CleanupStack::PopAndDestroy(encryptor);
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	    CleanupStack::Pop(outputBuff);    	    
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   261
	    
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	    return outputBuff;
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	}
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   264
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// ---------------------------------------------------------------------------
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// CSrtpAESCTRCrypto::IncreaseIV
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// 
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// ---------------------------------------------------------------------------
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//
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void CSrtpAESCTRCrypto::IncreaseIV(TDes8& iv)
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	{
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   272
	
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	if(iv[15] != 0xFF)
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		{
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		iv[15] += 1;	
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		}
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	else if(iv[14] != 0xFF)
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		{
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		iv[15] = 0;
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		iv[14] += 1;
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		}
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	else if(iv[13] != 0xFF)
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		{
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		iv[15] = 0;
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		iv[14] = 0;
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		iv[13] += 1;
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		}	
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	else if (iv[12] != 0xFF)
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		{
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		iv[15] = 0;
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		iv[14] = 0;
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		iv[13] = 0;
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		iv[12] += 1;
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		}		
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	else
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		{
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		iv[15] = 0;
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   298
		iv[14] = 0;
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   299
		iv[13] = 0;
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   300
		iv[12] = 0;
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   301
		}
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   302
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   303
	} 
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   304
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parents:
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   305