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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 __RC2_H__ |
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20 #define __RC2_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 RC2 block cipher |
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35 */ |
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36 namespace SoftwareCrypto |
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37 { |
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38 NONSHARABLE_CLASS(CRc2Impl) : public CSymmetricBlockCipherImpl |
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39 { |
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40 public: |
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41 |
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42 /** |
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43 Creates an instance of an RC2 symmetric cipher plug-in. |
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44 @param aKey The key |
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45 @param aCryptoMode Whether to encrypt or decrypt |
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46 @param aOperationMode The block cipher mode ECB, CBC, CTR etc |
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47 @param aPadding The padding scheme to use None, SSLv3, PKCS#7 |
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48 @param aEffectiveKeyLenBits The effective key length in bits |
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49 @return A pointer to a CRc2Impl instance |
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50 */ |
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51 static CRc2Impl* NewL(const CryptoSpi::CKey& aKey, |
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52 TUid aCryptoMode, TUid aOperationMode, TUid aPadding, TInt aEffectiveKeyLenBits); |
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53 |
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54 /** |
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55 Creates an instance of an RC2 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 The 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 @param aEffectiveKeyLenBits The effective key length in bits |
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62 @return A pointer to a CRc2Impl instance |
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63 */ |
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64 static CRc2Impl* NewLC(const CryptoSpi::CKey& aKey, |
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65 TUid aCryptoMode, TUid aOperationMode, TUid aPadding, TInt aEffectiveKeyLenBits); |
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66 |
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67 // From CSymmetricCipherImpl |
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68 TBool IsValidKeyLength(TInt aKeyBytes) const; |
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69 TUid ImplementationUid() const; |
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70 TInt GetKeyStrength() const; |
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71 |
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72 /// Destructor |
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73 ~CRc2Impl(); |
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74 |
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75 /** SSL Effective Key Length Compatibility - for compatibility with SSL */ |
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76 static const TUint KDefaultEffectiveKeyLenBits = 1024; |
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77 |
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78 private: |
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79 /** |
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80 Constructor |
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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 CRc2Impl(TUid aOperationMode, TUid aCryptoMode, TUid aPaddingMode); |
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86 |
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87 /// second phase of construction |
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88 void ConstructL(const CKey& aKey, TInt aEffectiveKeyLenBits); |
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89 |
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90 /** |
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91 Expands the key (iKey) to iEffectiveKeyLenBits and stores the result in iK |
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92 */ |
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93 void SetKeySchedule(); |
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94 |
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95 // From CSymmetricBlockCipherImpl |
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96 void TransformEncrypt(TUint8* aBuffer, TUint aNumBlocks); |
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97 void TransformDecrypt(TUint8* aBuffer, TUint aNumBlocks); |
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98 |
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99 private: |
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100 static const TUint8 KRc2BlockBytes = 8; |
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101 static const TInt KRc2MaxKeySizeBytes = 128; |
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102 static const TInt KRc2ExpandedKeyLen = 64; |
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103 /** |
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104 The expanded key buffer. |
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105 Each iK[i] is a 16-bit word. |
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106 */ |
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107 TUint16 iK[KRc2ExpandedKeyLen]; // 128 bytes |
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108 |
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109 /** The effective key length in bits */ |
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110 TInt iEffectiveKeyLenBits; |
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111 }; |
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112 } |
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113 |
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114 #endif //__RC2_H__ |