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1 /* |
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2 * Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of the License "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * |
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16 */ |
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17 |
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18 |
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19 #ifndef __DESIMPL_H__ |
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20 #define __DESIMPL_H__ |
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21 |
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22 /** |
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23 @file |
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24 @internalComponent |
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25 @released |
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26 */ |
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27 |
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28 #include <e32base.h> |
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29 #include <e32cmn.h> |
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30 #include "keys.h" |
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31 #include "symmetriccipherimpl.h" |
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32 |
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33 /** |
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34 Plug-in class for DES block cipher |
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35 */ |
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36 namespace SoftwareCrypto |
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37 { |
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38 using namespace CryptoSpi; |
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39 |
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40 NONSHARABLE_CLASS(CDesImpl) : public CSymmetricBlockCipherImpl |
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41 { |
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42 public: |
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43 /** |
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44 Creates an instance of a DES (Data Encryption Standard) symmetric cipher plug-in. |
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45 @param aKey The key |
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46 @param aCryptoMode whether to encrypt or decrypt |
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47 @param aOperationMode The block cipher mode ECB, CBC, CTR etc |
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48 @param aPadding The padding scheme to use None, SSLv3, PKCS#7 |
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49 @return A pointer to a CDesImpl instance |
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50 */ |
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51 static CDesImpl* NewL(const CKey& aKey, |
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52 TUid aCryptoMode, TUid aOperationMode, TUid aPadding); |
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53 |
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54 /** |
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55 Creates an instance of a DES (Data Encryption Standard) symmetric cipher plug-in. |
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56 A pointer to the plug-in instance is placed on the cleanup stack. |
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57 @param aKey The key |
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58 @param aCryptoMode Whether to encrypt or decrypt |
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59 @param aOperationMode T block cipher mode ECB, CBC, CTR etc |
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60 @param aPadding The padding scheme to use None, SSLv3, PKCS#7 |
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61 @return A pointer to a CDesImpl instance |
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62 */ |
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63 static CDesImpl* NewLC(const CKey& aKey, |
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64 TUid aCryptoMode, TUid aOperationMode, TUid aPadding); |
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65 |
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66 // From CSymmetricCipherImpl |
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67 TInt GetKeyStrength() const; |
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68 TBool IsValidKeyLength(TInt aKeyBytes) const; |
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69 TUid ImplementationUid() const; |
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70 const CExtendedCharacteristics* GetExtendedCharacteristicsL(); |
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71 |
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72 static CExtendedCharacteristics* CreateExtendedCharacteristicsL(); |
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73 |
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74 /// Destructor |
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75 ~CDesImpl(); |
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76 protected: |
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77 /** |
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78 Constructor |
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79 @param aBlockBytes The block size in bytes (needed to allow |
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80 3DES implementation to inherit from this class) |
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81 @param aOperationMode The mode of operation e.g. CBC |
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82 @param aCryptoMode Whether to encrypt or decrypt |
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83 @param aPaddingMode The padding mode to use. None, SSL, PKCS#7 |
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84 */ |
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85 CDesImpl(TUint8 aBlockBytes, TUid aOperationMode, TUid aCryptoMode, TUid aPaddingMode); |
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86 |
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87 /** |
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88 Second phase of construction |
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89 @param aKey The key object |
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90 */ |
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91 void ConstructL(const CKey& aKey); |
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92 |
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93 // These protected functions are re-used by 3DES |
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94 /** |
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95 Transforms a block of data |
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96 @param l The left half of the block to transform |
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97 @param r The right half of the block to transform |
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98 @param aKeySchedule The keyschedule to use for the transformation |
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99 */ |
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100 void DoTransform(TUint32& l, TUint32& r, const TUint32* aKeySchedule); |
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101 |
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102 /** |
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103 Setup the key schedule for encryption |
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104 @param aKey The input key |
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105 @param aKeySchedule A pointer to the key schedule buffer |
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106 */ |
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107 void SetEncryptKeySchedule(const TDesC8& aKey, TUint32* aKeySchedule); |
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108 |
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109 /** |
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110 Setup the key schedule for decryption |
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111 @param aKey The input key |
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112 @param aKeySchedule A pointer to the key schedule buffer |
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113 */ |
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114 void SetDecryptKeySchedule(const TDesC8& aKey, TUint32* aKeySchedule); |
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115 |
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116 static const TUint8 KDesBlockBytes = 8; |
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117 static const TUint8 KDesKeyBytes = 8; |
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118 |
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119 private: |
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120 |
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121 /** |
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122 Creates the key schedule iK from CBlockTransformationImpl::iKey. |
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123 This should be called from ConstructL and Reset |
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124 */ |
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125 void SetKeySchedule(); |
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126 |
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127 // From CSymmetricBlockCipherImpl |
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128 void TransformEncrypt(TUint8* aBuffer, TUint aNumBlocks); |
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129 void TransformDecrypt(TUint8* aBuffer, TUint aNumBlocks); |
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130 |
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131 private: |
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132 /// Size of the key schedule in words |
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133 static const TUint KKeyScheduleSize = 32; |
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134 |
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135 /// the key schedule |
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136 TUint32 iK[KKeyScheduleSize]; |
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137 }; |
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138 } |
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139 |
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140 #endif // __DESIMPL_H__ |