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os/security/crypto/weakcryptospi/source/symmetric/des.cpp
author sl@SLION-WIN7.fritz.box
Fri, 15 Jun 2012 03:10:57 +0200
changeset 0 bde4ae8d615e
permissions -rw-r--r--
First public contribution. 
     1 /*

     2 * Copyright (c) 2002-2009 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 *

    16 */

    17 

    18 

    19 #include <des.h>

    20 #include "desshim.h"

    21 

    22 const TInt KDESBlockBytes = 8;

    23 const TInt KDESKeyBytes = 8;

    24 

    25 CDES::~CDES()

    26 	{

    27 	}

    28 

    29 CDES::CDES()

    30 	{

    31 	}

    32 

    33 typedef TUint8 TKeyDES[KDESKeyBytes];

    34 const TInt KKnownWeakKeysCount = 16;

    35 

    36 const TKeyDES weak_keys[KKnownWeakKeysCount] =

    37 	{

    38 	/* weak keys */

    39 	{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},

    40 	{0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},

    41 	{0x1E,0x1E,0x1E,0x1E,0x0E,0x0E,0x0E,0x0E},

    42 	{0xE0,0xE0,0xE0,0xE0,0xF0,0xF0,0xF0,0xF0},

    43 	{0x00,0xFE,0x00,0xFE,0x00,0xFE,0x00,0xFE},

    44 	{0xFE,0x00,0xFE,0x00,0xFE,0x00,0xFE,0x00},

    45 	{0x1E,0xE0,0x1E,0xE0,0x0E,0xF0,0x0E,0xF0},

    46 	{0xE0,0x1E,0xE0,0x1E,0xF0,0x0E,0xF0,0x0E},

    47 	{0x00,0xE0,0x00,0xE0,0x00,0xF0,0x00,0xF0},

    48 	{0xE0,0x00,0xE0,0x00,0xF0,0x00,0xF0,0x00},

    49 	{0x1E,0xFE,0x1E,0xFE,0x0E,0xFE,0x0E,0xFE},

    50 	{0xFE,0x1E,0xFE,0x1E,0xFE,0x0E,0xFE,0x0E},

    51 	{0x00,0x1E,0x00,0x1E,0x00,0x0E,0x00,0x0E},

    52 	{0x1E,0x00,0x1E,0x00,0x0E,0x00,0x0E,0x00},

    53 	{0xE0,0xFE,0xE0,0xFE,0xF0,0xFE,0xF0,0xFE},

    54 	{0xFE,0xE0,0xFE,0xE0,0xFE,0xF0,0xFE,0xF0}

    55 	};

    56 	

    57 EXPORT_C TBool CDES::IsWeakKey(const TDesC8& aKey)

    58 	{

    59 	TKeyDES key;

    60 	TInt index = 0;

    61 	//Reset parity bits

    62 	for(; index < KDESKeyBytes; index++)

    63 		{

    64 		key[index] = aKey[index] & 0xFE;

    65 		}

    66 		

    67 	TBool weak = EFalse;	

    68 	//Compare key with potential weak keys without parity	

    69 	for (index=0; index < KKnownWeakKeysCount; index++)

    70 		{

    71 		if (Mem::Compare(weak_keys[index], KDESKeyBytes, &key[0], KDESKeyBytes)==0)

    72 			{

    73 			weak = ETrue;

    74 			break;

    75 			}

    76 		}

    77 	return weak;

    78 	}

    79 

    80 /* CDESEncryptor */

    81 EXPORT_C CDESEncryptor* CDESEncryptor::NewL(const TDesC8& aKey, TBool /*aCheckWeakKey*/)

    82 	{

    83 	return CDESEncryptorShim::NewL(aKey);

    84 	}

    85 

    86 EXPORT_C CDESEncryptor* CDESEncryptor::NewLC(const TDesC8& aKey, TBool /*aCheckWeakKey*/)

    87 	{

    88 	return CDESEncryptorShim::NewLC(aKey);

    89 	}

    90 

    91 CDESEncryptor::CDESEncryptor()

    92 	{

    93 	}

    94 

    95 /* CDESDecryptor */

    96 EXPORT_C CDESDecryptor* CDESDecryptor::NewL(const TDesC8& aKey, TBool /*aCheckWeakKey*/)

    97 	{

    98 	return CDESDecryptorShim::NewL(aKey);

    99 	}

   100 

   101 EXPORT_C CDESDecryptor* CDESDecryptor::NewLC(const TDesC8& aKey, TBool /*aCheckWeakKey*/)

   102 	{

   103 	return CDESDecryptorShim::NewLC(aKey);

   104 	}

   105 

   106 CDESDecryptor::CDESDecryptor()

   107 	{	

   108 	}

   109 	

   110 // All these methods have been replaced by the shim

   111 #ifdef _BullseyeCoverage

   112 #pragma suppress_warnings on

   113 #pragma BullseyeCoverage off

   114 #pragma suppress_warnings off

   115 #endif

   116 

   117 void CDES::Transform(TDes8& /*aBlock*/)

   118 	{

   119 	// Method replaced by shim 

   120 	ASSERT(EFalse);	

   121 	}

   122 

   123 TInt CDES::BlockSize() const

   124 	{

   125 	// Method replaced by shim 

   126 	ASSERT(EFalse);			

   127 	return KDESBlockBytes;

   128 	}

   129 

   130 TInt CDES::KeySize() const

   131 	{

   132 	// Method replaced by shim 

   133 	ASSERT(EFalse);			

   134 	return KDESKeyBytes;

   135 	}

   136 	

   137 void CDES::Reset()

   138 	{

   139 	// Method replaced by shim 

   140 	ASSERT(EFalse);			

   141 	}	

   142 	

   143 void CDES::SetKey(const TDesC8& /*aKey*/, TUint32* /*aKeyBuffer*/)

   144 	{

   145 	// Method replaced by shim 

   146 	ASSERT(EFalse);				

   147 	}

   148 	

   149 void CDES::ConstructL(const TDesC8& /*aKey*/, TBool /*aCheckWeakKey*/)

   150 	{

   151 	// Method replaced by shim 

   152 	ASSERT(EFalse);			

   153 	}

   154 

   155 void CDESDecryptor::SetKey(const TDesC8& /*aKey*/, TUint32* /*aKeyBuffer*/)

   156 	{

   157 	// Method replaced by shim 

   158 	ASSERT(EFalse);	

   159 	}
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